/*
 * 文件：public/static/front/css/site.css
 * 作用：前台全站样式：版式、首屏、暗色过程图、能力、案例、城市、AI 面板与响应式。
 * 技术：CSS
 * 
 * 威海颜翊网络科技有限公司
 * 项目：颜翊科技官网与全国城市站群
 * 开发负责人：@Renvir
 * 联系邮箱：pinenetcn@gmail.com
 * 版权：Copyright (c) 2026 威海颜翊网络科技有限公司
 * 说明：本项目代码为威海颜翊网络科技有限公司定制开发成果，未经书面许可不得复制、转售或用于未授权项目。
 */
/* Hallmark · macrostructure: Editorial Index · tone: austere, coastal, human
 * theme: custom - Glacier Ink (cool paper / deep sea ink / cobalt)
 * pre-emit critique: P5 H5 E5 S5 R5 V5
 */
@import url("tokens.css");

/* --------------------------------------------------------------------------
   Base · 基础重置与版式
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    overflow-x: clip;
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--header-h) + 24px);
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    overflow-x: clip;
    background: var(--color-paper);
    color: var(--color-ink);
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: 1.72;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

body.menu-open,
body.ai-open {
    overflow: hidden;
}

img,
svg {
    display: block;
    max-width: 100%;
}

img {
    height: auto;
}

a {
    color: inherit;
    text-decoration: none;
}

button,
input,
select,
textarea {
    font: inherit;
    color: inherit;
}

button {
    cursor: pointer;
}

::selection {
    background: var(--color-accent);
    color: var(--color-paper);
}

:focus-visible {
    outline: 2px solid var(--color-focus);
    outline-offset: 3px;
}

h1,
h2,
h3,
h4,
p,
dl,
dd,
figure {
    margin: 0;
}

h1,
h2,
h3,
h4 {
    font-family: var(--font-display);
    font-style: normal;
    font-weight: 600;
    letter-spacing: -0.025em;
    line-height: 1.1;
    text-wrap: balance;
}

ul,
ol {
    margin: 0;
    padding: 0;
    list-style: none;
}

.shell {
    width: 100%;
    max-width: var(--container);
    margin-inline: auto;
    padding-inline: clamp(20px, 4.2vw, 60px);
}

.visually-hidden {
    position: absolute !important;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
}

.skip-link {
    position: fixed;
    left: 16px;
    top: -80px;
    z-index: 200;
    padding: 12px 18px;
    background: var(--color-ink);
    color: var(--color-paper);
    font-size: var(--text-sm);
    transition: top var(--dur-fast) var(--ease-out);
}

.skip-link:focus {
    top: 16px;
}

.index-label,
.eyebrow,
.foot-label,
.ai-kicker {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    font-weight: 400;
    letter-spacing: 0.13em;
    line-height: 1.5;
    text-transform: uppercase;
    color: var(--color-accent);
}

.section {
    padding-block: clamp(72px, 9vw, 132px);
    border-top: var(--rule) solid var(--color-line);
}

.section-head {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(200px, 350px);
    gap: var(--space-10);
    align-items: end;
    margin-bottom: clamp(36px, 5vw, 64px);
}

.section-head h2 {
    font-size: var(--text-2xl);
    max-width: 16ch;
}

.section-note {
    color: var(--color-muted);
    font-size: var(--text-sm);
    line-height: 1.8;
    max-width: 32ch;
}

.text-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 44px;
    font-size: var(--text-sm);
    color: var(--color-ink);
    border-bottom: var(--rule) solid var(--color-line-strong);
    transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}

.text-link span {
    display: inline-block;
    transition: transform var(--dur-fast) var(--ease-out);
}

.text-link:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.text-link:hover span {
    transform: translate(2px, -2px);
}

/* --------------------------------------------------------------------------
   Buttons & forms · 按钮与表单
   -------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    min-height: 50px;
    padding: 0 22px;
    border: var(--rule) solid var(--color-ink);
    border-radius: var(--radius-xs);
    background: transparent;
    color: var(--color-ink);
    font-size: var(--text-sm);
    font-weight: 500;
    letter-spacing: 0.01em;
    transition: background var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}

.btn svg {
    width: 17px;
    height: 17px;
    flex: none;
    transition: transform var(--dur-fast) var(--ease-out);
}

.btn:hover svg {
    transform: translateX(3px);
}

.btn-ink {
    background: var(--color-ink);
    color: var(--color-paper);
}

.btn-ink:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
}

.btn-sm {
    min-height: 42px;
    padding-inline: 18px;
    font-size: var(--text-sm);
}

.btn[disabled] {
    cursor: wait;
    opacity: 0.7;
}

.btn.is-loading svg {
    display: none;
}

.btn.is-loading::after {
    content: "";
    width: 14px;
    height: 14px;
    border: 1.5px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spin 700ms linear infinite;
}

.contact-form {
    width: 100%;
}

.contact-form .hp {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-5);
}

.field {
    margin-bottom: var(--space-5);
    min-width: 0;
}

.field label {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 8px;
    font-size: var(--text-xs);
    letter-spacing: 0.05em;
    color: var(--color-ink-2);
}

.field label span {
    color: var(--color-muted-2);
    font-size: 11px;
}

.field input,
.field select,
.field textarea {
    width: 100%;
    min-height: 48px;
    padding: 12px 14px;
    border: var(--rule) solid var(--color-line-strong);
    border-radius: var(--radius-xs);
    background: var(--color-paper);
    color: var(--color-ink);
    font-size: var(--text-sm);
    line-height: 1.6;
    transition: border-color var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
}

.field textarea {
    min-height: 122px;
    resize: vertical;
}

.field input::placeholder,
.field textarea::placeholder {
    color: var(--color-muted-2);
}

.field input:hover,
.field select:hover,
.field textarea:hover {
    border-color: var(--color-ink-2);
}

.field input:focus,
.field select:focus,
.field textarea:focus {
    outline: none;
    border-color: var(--color-ink);
    box-shadow: 0 0 0 3px color-mix(in oklab, var(--color-focus) 18%, transparent);
}

.field input[aria-invalid="true"],
.field textarea[aria-invalid="true"],
.field select[aria-invalid="true"] {
    border-color: var(--color-danger);
}

.consent {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin: 4px 0 var(--space-6);
    color: var(--color-muted);
    font-size: var(--text-xs);
    line-height: 1.7;
}

.consent input {
    width: 16px;
    height: 16px;
    margin-top: 4px;
    accent-color: var(--color-accent);
    flex: none;
}

.consent a {
    color: var(--color-ink);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.form-actions {
    display: flex;
    align-items: center;
    gap: var(--space-5);
    flex-wrap: wrap;
}

.form-status {
    min-height: 22px;
    margin: 0;
    font-size: var(--text-xs);
    color: var(--color-muted);
}

.form-status.is-error {
    color: var(--color-danger);
}

.form-status.is-success {
    color: var(--color-success);
}

/* --------------------------------------------------------------------------
   Header · 页头与移动导航
   -------------------------------------------------------------------------- */
.site-head {
    position: sticky;
    top: 0;
    z-index: 60;
    background: var(--color-paper);
    border-bottom: var(--rule) solid transparent;
    transition: border-color var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
}

.site-head.is-scrolled {
    border-bottom-color: var(--color-line);
    box-shadow: 0 1px 0 var(--color-line);
}

.head-inner {
    height: var(--header-h);
    display: flex;
    align-items: center;
    gap: clamp(20px, 3vw, 44px);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    flex: none;
}

.brand-logo {
    width: 148px;
    height: auto;
}

.brand-city {
    border-left: var(--rule) solid var(--color-line-strong);
    padding-left: 12px;
    font-family: var(--font-display);
    font-size: 14px;
    letter-spacing: 0.06em;
    color: var(--color-accent);
}

.desktop-nav {
    display: flex;
    align-items: center;
    gap: clamp(14px, 2.1vw, 30px);
    margin-left: auto;
}

.desktop-nav a {
    position: relative;
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    padding: 2px 0;
    font-size: var(--text-sm);
    color: var(--color-ink-2);
    white-space: nowrap;
    transition: color var(--dur-fast) var(--ease-out);
}

.desktop-nav a::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 9px;
    height: 1px;
    background: var(--color-accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--dur-base) var(--ease-out);
}

.desktop-nav a:hover,
.desktop-nav a.is-active {
    color: var(--color-ink);
}

.desktop-nav a:hover::after,
.desktop-nav a.is-active::after {
    transform: scaleX(1);
}

.head-actions {
    display: flex;
    align-items: center;
    gap: 16px;
    flex: none;
}

.head-phone {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--color-muted);
    letter-spacing: 0.03em;
}

.head-phone:hover {
    color: var(--color-accent);
}

.menu-toggle {
    display: none;
    width: 44px;
    height: 44px;
    padding: 0;
    border: var(--rule) solid var(--color-line-strong);
    background: transparent;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 5px;
}

.menu-toggle span {
    display: block;
    width: 18px;
    height: 1px;
    background: var(--color-ink);
}

.mobile-menu {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: flex;
    flex-direction: column;
    padding: 24px clamp(20px, 6vw, 40px) 32px;
    background: var(--color-night);
    color: var(--color-paper-on-dark);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-12px);
    transition: opacity var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out), visibility var(--dur-base);
}

.mobile-menu.is-open {
    visibility: visible;
    opacity: 1;
    transform: none;
}

.mobile-menu-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 20px;
    border-bottom: var(--rule) solid var(--color-line-on-dark);
}

.mobile-menu-top img {
    width: 150px;
}

.menu-close {
    width: 44px;
    height: 44px;
    display: grid;
    place-items: center;
    border: var(--rule) solid var(--color-line-on-dark);
    background: transparent;
    color: var(--color-paper-on-dark);
}

.menu-close svg {
    width: 20px;
    height: 20px;
}

.mobile-nav {
    display: flex;
    flex-direction: column;
    padding: 28px 0;
    overflow-y: auto;
}

.mobile-nav a {
    display: flex;
    align-items: baseline;
    gap: 18px;
    padding: 13px 0;
    border-bottom: var(--rule) solid var(--color-line-on-dark);
    font-family: var(--font-display);
    font-size: clamp(1.7rem, 6vw, 2.3rem);
    line-height: 1.25;
}

.mobile-nav a span {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--color-accent-soft);
    letter-spacing: 0.08em;
}

.mobile-menu-foot {
    margin-top: auto;
    display: flex;
    flex-direction: column;
    gap: 4px;
    color: var(--color-muted-on-dark);
    font-size: var(--text-sm);
}

.mobile-menu-foot p {
    margin-bottom: 10px;
    font-family: var(--font-display);
    color: var(--color-paper-on-dark);
    font-size: 1.15rem;
}

/* --------------------------------------------------------------------------
   Hero · 首页首屏
   -------------------------------------------------------------------------- */
.hero {
    padding-top: clamp(48px, 7vw, 86px);
    overflow: clip;
}

.hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: clamp(20px, 4vw, 64px);
    align-items: center;
    min-height: calc(100svh - var(--header-h) - 120px);
    padding-bottom: clamp(40px, 6vw, 80px);
}

.hero-copy {
    min-width: 0;
    position: relative;
    z-index: 2;
}

.hero-title {
    margin: 20px 0 22px;
    font-size: var(--text-display);
    line-height: 0.92;
    letter-spacing: -0.055em;
    color: var(--color-ink);
    overflow-wrap: anywhere;
}

.hero-title span {
    display: block;
    animation: rise-in 900ms var(--ease-out) both;
}

.hero-title span:nth-child(2) {
    animation-delay: 90ms;
    color: var(--color-accent);
}

.hero-title-city {
    font-size: var(--text-display-s);
    line-height: 1.03;
    letter-spacing: -0.04em;
    max-width: 12ch;
    animation: rise-in 900ms var(--ease-out) both;
}

.hero-brandline {
    margin: -8px 0 20px;
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    letter-spacing: 0.16em;
    color: var(--color-accent);
}

.hero-lead {
    max-width: 36rem;
    color: var(--color-ink-2);
    font-size: clamp(1rem, 1.35vw, 1.2rem);
    line-height: 1.85;
    animation: fade-up 700ms var(--ease-out) 250ms both;
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 22px;
}

.hero-tags span {
    padding: 6px 10px;
    border: var(--rule) solid var(--color-line-strong);
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.02em;
    color: var(--color-ink-2);
}

.hero-actions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-6);
    margin-top: 32px;
    animation: fade-up 700ms var(--ease-out) 340ms both;
}

.hero-foot {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    margin-top: clamp(36px, 5vw, 62px);
    padding-top: 18px;
    border-top: var(--rule) solid var(--color-line);
    animation: fade-up 700ms var(--ease-out) 420ms both;
}

.hero-foot div {
    display: flex;
    flex-direction: column;
    gap: 3px;
    min-width: 0;
}

.hero-foot span {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-muted-2);
}

.hero-foot strong {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-ink);
}

.hero-art {
    position: relative;
    min-width: 0;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    justify-content: center;
    animation: fade-in 1100ms var(--ease-out) 220ms both;
}

.hero-art svg {
    width: min(100%, 560px);
    height: auto;
    overflow: visible;
}

.topo-lines path {
    fill: none;
    stroke: var(--color-line-strong);
    stroke-width: 0.8;
    opacity: 0.72;
}

.topo-peaks path {
    fill: none;
    stroke: var(--color-ink);
    stroke-width: 1.15;
    opacity: 0.9;
}

.topo-sun {
    fill: var(--color-accent);
}

.topo-cross {
    stroke: var(--color-accent);
    stroke-width: 0.8;
    opacity: 0.7;
    fill: none;
}

.hero-art-label {
    position: absolute;
    top: 4%;
    left: 0;
    font-family: var(--font-mono);
    font-size: 10px;
    line-height: 1.7;
    letter-spacing: 0.1em;
    color: var(--color-muted);
}

.hero-art-note {
    margin-top: 8px;
    padding-right: 6px;
    font-family: var(--font-display);
    font-size: 0.95rem;
    color: var(--color-muted);
    text-align: right;
    letter-spacing: 0.04em;
}

.hero-scroll {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding-bottom: 18px;
    border-top: var(--rule) solid var(--color-line);
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.12em;
    color: var(--color-muted-2);
}

.hero-scroll i {
    display: block;
    width: 1px;
    height: 34px;
    background: var(--color-line-strong);
    position: relative;
    overflow: hidden;
}

.hero-scroll i::after {
    content: "";
    position: absolute;
    inset: 0;
    background: var(--color-accent);
    animation: scroll-line 2.4s var(--ease-in-out) infinite;
}

.hero-scroll span {
    writing-mode: vertical-rl;
}

/* --------------------------------------------------------------------------
   Statement · 品牌立场
   -------------------------------------------------------------------------- */
.statement-grid {
    display: grid;
    grid-template-columns: 170px minmax(0, 1fr) 250px;
    gap: clamp(24px, 4vw, 60px);
    align-items: start;
}

.statement-aside {
    padding-top: 8px;
}

.statement-en {
    margin-top: 18px;
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    line-height: 1.65;
    color: var(--color-muted-2);
}

.statement-main h2 {
    font-size: var(--text-2xl);
    max-width: 14ch;
    margin-bottom: 38px;
}

.statement-copy {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-8);
    padding-top: 24px;
    border-top: var(--rule) solid var(--color-line);
    color: var(--color-muted);
    font-size: var(--text-sm);
    line-height: 1.85;
}

.statement-facts {
    border-top: var(--rule) solid var(--color-line-strong);
}

.statement-facts div {
    display: flex;
    flex-direction: column;
    gap: 3px;
    padding: 14px 0;
    border-bottom: var(--rule) solid var(--color-line);
}

.statement-facts dt {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.08em;
    color: var(--color-muted-2);
}

.statement-facts dd {
    font-size: var(--text-sm);
    color: var(--color-ink);
}

/* --------------------------------------------------------------------------
   Cosmology · 暗色过程图（同心圆与网格）
   -------------------------------------------------------------------------- */
.cosmology {
    position: relative;
    overflow: hidden;
    background: var(--color-night);
    color: var(--color-paper-on-dark);
    border-top: 0;
}

.cosmology-shell {
    display: grid;
    grid-template-columns: minmax(0, 0.62fr) minmax(0, 1.38fr);
    gap: clamp(28px, 5vw, 74px);
    align-items: center;
}

.cosmology-copy {
    position: relative;
    z-index: 3;
}

.cosmology .index-label {
    color: var(--color-accent-soft);
}

.cosmology-copy h2 {
    margin: 16px 0 22px;
    font-size: var(--text-2xl);
    max-width: 13ch;
}

.cosmology-copy > p:not(.index-label) {
    max-width: 34ch;
    color: var(--color-muted-on-dark);
    font-size: var(--text-sm);
    line-height: 1.9;
}

.cosmology-stage {
    position: relative;
    min-height: 660px;
    isolation: isolate;
}

.cosmology-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(to right, color-mix(in oklab, var(--color-paper-on-dark) 8%, transparent) 1px, transparent 1px),
        linear-gradient(to bottom, color-mix(in oklab, var(--color-paper-on-dark) 8%, transparent) 1px, transparent 1px);
    background-size: 66px 66px;
    opacity: 0.65;
    mask-image: linear-gradient(to right, transparent 0%, #000 18%, #000 94%, transparent 100%);
}

.cosmology-orbit {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 430px;
    height: 430px;
    margin: -215px 0 0 -215px;
    border: 1px solid color-mix(in oklab, var(--color-paper-on-dark) 18%, transparent);
    border-radius: 50%;
    pointer-events: none;
}

.orbit-outer {
    width: 610px;
    height: 610px;
    margin: -305px 0 0 -305px;
    border-style: dashed;
    border-color: color-mix(in oklab, var(--color-paper-on-dark) 14%, transparent);
    animation: orbit-spin 80s linear infinite;
}

.orbit-inner::before,
.orbit-inner::after {
    content: "";
    position: absolute;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--color-accent-soft);
}

.orbit-inner::before {
    left: 50%;
    top: -2.5px;
}

.orbit-inner::after {
    right: 12%;
    bottom: 18%;
    background: var(--color-paper-on-dark);
    opacity: 0.8;
}

.cosmology-core {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 300px;
    height: 300px;
    transform: translate(-50%, -50%);
    border: 1px solid color-mix(in oklab, var(--color-paper-on-dark) 35%, transparent);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: color-mix(in oklab, var(--color-night) 74%, transparent);
    z-index: 2;
}

.cosmology-core > span {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.24em;
    color: var(--color-accent-soft);
}

.cosmology-core strong {
    display: block;
    margin: 16px 0;
    font-family: var(--font-display);
    font-size: clamp(2rem, 3.3vw, 2.9rem);
    font-weight: 400;
    line-height: 1.35;
    color: var(--color-paper-on-dark);
}

.cosmology-core small {
    font-family: var(--font-mono);
    font-size: 9px;
    letter-spacing: 0.12em;
    color: var(--color-muted-on-dark);
}

.cosmology-node {
    position: absolute;
    z-index: 3;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-accent-soft);
    box-shadow: 0 0 0 5px color-mix(in oklab, var(--color-accent-soft) 10%, transparent);
}

.node-a {
    left: 22%;
    top: 28%;
}

.node-b {
    right: 17%;
    top: 47%;
    background: var(--color-paper-on-dark);
}

.node-c {
    left: 30%;
    bottom: 19%;
    background: var(--color-paper-on-dark);
    opacity: 0.65;
}

.cosmology-note {
    position: absolute;
    z-index: 4;
    width: 224px;
    padding: 15px 17px;
    border: 1px solid color-mix(in oklab, var(--color-paper-on-dark) 22%, transparent);
    background: color-mix(in oklab, var(--color-night) 78%, transparent);
    backdrop-filter: blur(4px);
}

.cosmology-note > span {
    font-family: var(--font-mono);
    font-size: 9px;
    letter-spacing: 0.12em;
    color: var(--color-accent-soft);
}

.cosmology-note h3 {
    margin: 15px 0 6px;
    font-family: var(--font-sans);
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0;
    color: var(--color-paper-on-dark);
}

.cosmology-note p {
    font-size: 10px;
    line-height: 1.75;
    color: var(--color-muted-on-dark);
}

.note-define {
    left: -3%;
    top: 12%;
}

.note-build {
    right: -2%;
    top: 43%;
}

.note-evolve {
    left: 8%;
    bottom: 8%;
}

@keyframes orbit-spin {
    to { transform: rotate(360deg); }
}

/* --------------------------------------------------------------------------
   Capabilities · 能力列表
   -------------------------------------------------------------------------- */
.capability-list {
    border-bottom: var(--rule) solid var(--color-line);
}

.capability-row {
    position: relative;
    display: grid;
    grid-template-columns: 60px minmax(0, 1.15fr) minmax(0, 0.85fr) 38px;
    gap: clamp(16px, 2.2vw, 34px);
    align-items: center;
    padding: 26px 0;
    border-top: var(--rule) solid var(--color-line);
    transition: background-color var(--dur-base) var(--ease-out);
}

.capability-row:hover {
    background: var(--color-paper-2);
}

.capability-num {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--color-muted-2);
    letter-spacing: 0.08em;
}

.capability-name {
    display: flex;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 12px;
    min-width: 0;
}

.capability-name h3 {
    font-size: clamp(1.3rem, 2vw, 1.75rem);
    letter-spacing: -0.02em;
}

.capability-name span {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.06em;
    color: var(--color-muted-2);
    text-transform: uppercase;
}

.capability-row p {
    color: var(--color-muted);
    font-size: var(--text-sm);
    line-height: 1.75;
    min-width: 0;
}

.capability-arrow {
    width: 38px;
    height: 38px;
    display: grid;
    place-items: center;
    border: var(--rule) solid var(--color-line-strong);
    color: var(--color-ink);
    transition: background var(--dur-base) var(--ease-out), color var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out);
}

.capability-arrow svg {
    width: 18px;
    height: 18px;
    transition: transform var(--dur-base) var(--ease-out);
}

.capability-row:hover .capability-arrow {
    background: var(--color-ink);
    border-color: var(--color-ink);
    color: var(--color-paper);
}

.capability-row:hover .capability-arrow svg {
    transform: translate(3px, -3px);
}

/* --------------------------------------------------------------------------
   Work · 项目案例
   -------------------------------------------------------------------------- */
.work-list {
    display: flex;
    flex-direction: column;
}

.work-item {
    display: grid;
    grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.82fr);
    gap: clamp(28px, 5vw, 76px);
    align-items: center;
    padding: clamp(32px, 5vw, 64px) 0;
    border-top: var(--rule) solid var(--color-line);
}

.work-item:last-child {
    border-bottom: var(--rule) solid var(--color-line);
}

.work-item.is-reverse .work-image {
    order: 2;
}

.work-image {
    display: block;
    overflow: hidden;
    border: var(--rule) solid var(--color-line-strong);
    background: var(--color-paper-2);
    aspect-ratio: 16 / 10;
}

.work-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 700ms var(--ease-out);
}

.work-image:hover img {
    transform: scale(1.025);
}

.work-copy {
    min-width: 0;
}

.work-meta {
    font-family: var(--font-mono);
    font-size: 10px;
    line-height: 1.7;
    letter-spacing: 0.05em;
    color: var(--color-muted-2);
}

.work-meta span {
    margin-inline: 5px;
    color: var(--color-line-strong);
}

.work-copy h3 {
    margin: 16px 0 16px;
    font-size: clamp(1.6rem, 2.7vw, 2.25rem);
    line-height: 1.25;
}

.work-copy h3 a {
    transition: color var(--dur-fast) var(--ease-out);
}

.work-copy h3 a:hover {
    color: var(--color-accent);
}

.work-copy > p:not(.work-meta) {
    color: var(--color-muted);
    font-size: var(--text-sm);
    line-height: 1.8;
    margin-bottom: 24px;
}

/* --------------------------------------------------------------------------
   Process & principles · 流程与原则
   -------------------------------------------------------------------------- */
.process-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: clamp(32px, 6vw, 96px);
    align-items: start;
}

.process-intro {
    position: sticky;
    top: calc(var(--header-h) + 34px);
}

.process-intro h2 {
    font-size: var(--text-2xl);
    margin: 16px 0 22px;
}

.process-intro > p:not(.index-label) {
    max-width: 32ch;
    color: var(--color-muted);
    font-size: var(--text-sm);
    line-height: 1.85;
    margin-bottom: 28px;
}

.process-list {
    border-bottom: var(--rule) solid var(--color-line);
}

.process-list li {
    display: grid;
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 18px;
    padding: 22px 0;
    border-top: var(--rule) solid var(--color-line);
}

.process-list li > span {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--color-accent);
    padding-top: 5px;
}

.process-list h3 {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    font-weight: 600;
    letter-spacing: 0;
    margin-bottom: 4px;
}

.process-list p {
    color: var(--color-muted);
    font-size: var(--text-sm);
    line-height: 1.75;
}

.principles {
    padding-top: 0;
}

.principles-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: clamp(16px, 2.6vw, 36px);
    margin-top: 28px;
}

.principles-grid article {
    padding-top: 18px;
    border-top: var(--rule) solid var(--color-line-strong);
    min-width: 0;
}

.principles-grid article > span {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--color-muted-2);
}

.principles-grid h3 {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    font-weight: 600;
    margin: 20px 0 10px;
    letter-spacing: 0;
}

.principles-grid p {
    color: var(--color-muted);
    font-size: var(--text-sm);
    line-height: 1.75;
}

/* --------------------------------------------------------------------------
   City network · 城市网络
   -------------------------------------------------------------------------- */
.city-network {
    background: var(--color-night);
    color: var(--color-paper-on-dark);
    border-top: 0;
}

.city-network-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: clamp(36px, 7vw, 110px);
}

.city-network .index-label {
    color: var(--color-accent-soft);
}

.city-network h2 {
    font-size: var(--text-2xl);
    margin-top: 16px;
}

.city-network-copy > p {
    max-width: 46ch;
    color: var(--color-muted-on-dark);
    font-size: var(--text-sm);
    line-height: 1.9;
    margin-bottom: 28px;
}

.city-links {
    border-bottom: var(--rule) solid var(--color-line-on-dark);
}

.city-links a {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 20px;
    padding: 18px 0;
    border-top: var(--rule) solid var(--color-line-on-dark);
    transition: color var(--dur-fast) var(--ease-out);
}

.city-links a span {
    font-family: var(--font-display);
    font-size: clamp(1.25rem, 2vw, 1.55rem);
}

.city-links a small {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.08em;
    color: var(--color-muted-on-dark);
}

.city-links a:hover {
    color: var(--color-accent-soft);
}

/* --------------------------------------------------------------------------
   Insights · 洞察列表
   -------------------------------------------------------------------------- */
.insight-list {
    border-bottom: var(--rule) solid var(--color-line);
}

.insight-row {
    display: grid;
    grid-template-columns: 100px 100px minmax(0, 1fr) 28px;
    gap: 18px;
    align-items: center;
    padding: 22px 0;
    border-top: var(--rule) solid var(--color-line);
    transition: color var(--dur-fast) var(--ease-out);
}

.insight-date,
.insight-cat {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.03em;
    color: var(--color-muted-2);
}

.insight-cat {
    color: var(--color-accent);
}

.insight-row h3 {
    font-family: var(--font-display);
    font-size: clamp(1.1rem, 1.7vw, 1.45rem);
    line-height: 1.4;
    letter-spacing: -0.01em;
}

.insight-arrow {
    color: var(--color-muted-2);
    transition: transform var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}

.insight-row:hover {
    color: var(--color-accent);
}

.insight-row:hover .insight-arrow {
    transform: translate(2px, -2px);
    color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   Contact · 咨询区域
   -------------------------------------------------------------------------- */
.contact-section {
    background: var(--color-paper-2);
}

.contact-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
    gap: clamp(36px, 7vw, 110px);
    align-items: start;
}

.contact-intro h2 {
    font-size: var(--text-2xl);
    margin: 16px 0 24px;
}

.contact-intro > p:not(.index-label) {
    max-width: 36ch;
    color: var(--color-muted);
    font-size: var(--text-sm);
    line-height: 1.9;
}

.contact-direct {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    margin-top: 32px;
}

.contact-direct a {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    border-bottom: var(--rule) solid var(--color-line-strong);
    padding-bottom: 2px;
    transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}

.contact-direct a:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.contact-form-wrap {
    background: var(--color-paper);
    border: var(--rule) solid var(--color-line-strong);
    padding: clamp(22px, 3.2vw, 38px);
}

/* --------------------------------------------------------------------------
   Local city context · 城市本地内容
   -------------------------------------------------------------------------- */
.local-context {
    background: var(--color-paper);
}

.local-context-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: clamp(32px, 6vw, 96px);
}

.local-context h2 {
    font-size: var(--text-2xl);
    margin-top: 16px;
}

.local-prose > p {
    max-width: 58ch;
    color: var(--color-ink-2);
    line-height: 1.95;
    font-size: var(--text-base);
}

.local-faq {
    margin-top: 32px;
    border-bottom: var(--rule) solid var(--color-line);
}

.local-faq details {
    border-top: var(--rule) solid var(--color-line);
}

.local-faq summary {
    padding: 17px 0;
    cursor: pointer;
    font-size: var(--text-sm);
    font-weight: 500;
    list-style: none;
    position: relative;
    padding-right: 34px;
}

.local-faq summary::-webkit-details-marker {
    display: none;
}

.local-faq summary::after {
    content: "+";
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    font-family: var(--font-mono);
    color: var(--color-accent);
}

.local-faq details[open] summary::after {
    content: "−";
}

.local-faq details p {
    padding: 0 0 18px;
    max-width: 62ch;
    color: var(--color-muted);
    font-size: var(--text-sm);
    line-height: 1.8;
}

.nearby-cities {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px 16px;
    margin-top: 28px;
    font-size: var(--text-xs);
}

.nearby-cities > span {
    font-family: var(--font-mono);
    color: var(--color-muted-2);
    letter-spacing: 0.08em;
}

.nearby-cities a {
    color: var(--color-ink-2);
    border-bottom: var(--rule) solid var(--color-line-strong);
    transition: color var(--dur-fast) var(--ease-out);
}

.nearby-cities a:hover {
    color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   Footer · 页脚
   -------------------------------------------------------------------------- */
.site-foot {
    background: var(--color-night);
    color: var(--color-paper-on-dark);
    border-top: var(--rule) solid var(--color-night-2);
    padding-top: clamp(56px, 8vw, 100px);
}

.foot-main {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(36px, 7vw, 100px);
    padding-bottom: clamp(48px, 7vw, 84px);
}

.foot-logo {
    width: 180px;
    height: auto;
}

.foot-slogan {
    margin-top: 28px;
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 3vw, 2.6rem);
    line-height: 1.35;
    letter-spacing: -0.03em;
}

.foot-line {
    margin-top: 12px;
    color: var(--color-muted-on-dark);
    font-size: var(--text-sm);
}

.foot-cols {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-6);
}

.foot-col {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 7px;
    min-width: 0;
}

.foot-label {
    color: var(--color-accent-soft);
    margin-bottom: 10px;
}

.foot-col a,
.foot-col p {
    color: var(--color-muted-on-dark);
    font-size: var(--text-sm);
    line-height: 1.7;
    overflow-wrap: anywhere;
}

.foot-col a:hover {
    color: var(--color-paper-on-dark);
}

.foot-contact p {
    margin-top: 8px;
    max-width: 22ch;
}

.foot-cityline {
    border-top: var(--rule) solid var(--color-line-on-dark);
    border-bottom: var(--rule) solid var(--color-line-on-dark);
}

.foot-city-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px 22px;
    min-height: 60px;
    font-size: var(--text-xs);
    color: var(--color-muted-on-dark);
}

.foot-city-inner > span {
    font-family: var(--font-mono);
    color: var(--color-accent-soft);
    letter-spacing: 0.08em;
}

.foot-city-inner a {
    border-bottom: var(--rule) solid transparent;
    padding-block: 6px;
}

.foot-city-inner a:hover {
    color: var(--color-paper-on-dark);
    border-color: var(--color-line-on-dark);
}

.foot-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
    padding-block: 24px;
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--color-muted-on-dark);
    letter-spacing: 0.03em;
}

.foot-legal {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.foot-legal a:hover {
    color: var(--color-paper-on-dark);
}

/* --------------------------------------------------------------------------
   AI consultant · AI 项目顾问
   -------------------------------------------------------------------------- */
.ai-dock {
    position: fixed;
    right: clamp(14px, 2.4vw, 28px);
    bottom: clamp(14px, 2.4vw, 28px);
    z-index: 80;
    display: inline-flex;
    align-items: center;
    gap: 9px;
    min-height: 44px;
    padding: 0 16px;
    border: var(--rule) solid var(--color-ink);
    border-radius: var(--radius-xs);
    background: var(--color-ink);
    color: var(--color-paper);
    font-size: var(--text-xs);
    letter-spacing: 0.04em;
    box-shadow: var(--shadow-soft);
    transition: background var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}

.ai-dock:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
    transform: translateY(-2px);
}

.ai-dock-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-accent-soft);
    box-shadow: 0 0 0 3px color-mix(in oklab, var(--color-accent-soft) 20%, transparent);
}

.ai-scrim {
    position: fixed;
    inset: 0;
    z-index: 85;
    background: color-mix(in oklab, var(--color-night) 42%, transparent);
}

.ai-panel {
    position: fixed;
    right: clamp(12px, 2vw, 24px);
    bottom: calc(clamp(12px, 2vw, 24px) + 58px);
    z-index: 90;
    display: flex;
    flex-direction: column;
    width: min(430px, calc(100vw - 24px));
    max-height: min(680px, calc(100dvh - 100px));
    background: var(--color-paper);
    border: var(--rule) solid var(--color-ink);
    box-shadow: var(--shadow-float);
    opacity: 0;
    visibility: hidden;
    transform: translateY(16px);
    transition: opacity var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out), visibility var(--dur-base);
}

.ai-panel.is-open {
    opacity: 1;
    visibility: visible;
    transform: none;
}

.ai-panel-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    padding: 20px;
    border-bottom: var(--rule) solid var(--color-line);
    background: var(--color-paper-2);
}

.ai-panel-head h2 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    margin-top: 6px;
    letter-spacing: -0.01em;
}

.ai-kicker {
    font-size: 10px;
    color: var(--color-accent);
}

.ai-close {
    width: 34px;
    height: 34px;
    flex: none;
    display: grid;
    place-items: center;
    border: var(--rule) solid var(--color-line-strong);
    background: transparent;
}

.ai-close svg {
    width: 16px;
    height: 16px;
}

.ai-messages {
    flex: 1;
    min-height: 180px;
    overflow-y: auto;
    padding: 18px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.ai-msg {
    max-width: 88%;
    padding: 11px 13px;
    background: var(--color-paper-2);
    border: var(--rule) solid var(--color-line);
    font-size: 13px;
    line-height: 1.7;
    overflow-wrap: anywhere;
}

.ai-msg p {
    margin: 0;
    white-space: pre-wrap;
}

.ai-msg.is-user {
    align-self: flex-end;
    background: var(--color-ink);
    color: var(--color-paper);
    border-color: var(--color-ink);
}

.ai-msg.is-pending {
    color: var(--color-muted);
}

.ai-msg.is-pending p::after {
    content: "";
    display: inline-block;
    width: 12px;
    height: 12px;
    margin-left: 8px;
    vertical-align: -2px;
    border: 1.4px solid var(--color-line-strong);
    border-right-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 700ms linear infinite;
}

.ai-suggestions {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    padding: 0 18px 12px;
}

.ai-suggestions button {
    padding: 6px 9px;
    border: var(--rule) solid var(--color-line-strong);
    background: transparent;
    font-size: 11px;
    color: var(--color-ink-2);
    transition: border-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}

.ai-suggestions button:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.ai-form {
    padding: 14px 18px 16px;
    border-top: var(--rule) solid var(--color-line);
}

.ai-form textarea {
    width: 100%;
    min-height: 56px;
    max-height: 140px;
    resize: vertical;
    border: var(--rule) solid var(--color-line-strong);
    background: var(--color-paper);
    padding: 10px 12px;
    font-size: 13px;
    line-height: 1.6;
}

.ai-form textarea:focus {
    outline: none;
    border-color: var(--color-ink);
}

.ai-form-foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-top: 8px;
}

.ai-note {
    font-size: 10px;
    line-height: 1.5;
    color: var(--color-muted-2);
}

.ai-send {
    width: 34px;
    height: 34px;
    flex: none;
    display: grid;
    place-items: center;
    border: var(--rule) solid var(--color-ink);
    background: var(--color-ink);
    color: var(--color-paper);
}

.ai-send:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
}

.ai-send[disabled] {
    opacity: 0.55;
    cursor: wait;
}

.ai-send svg {
    width: 16px;
    height: 16px;
}

.ai-status {
    min-height: 16px;
    margin: 6px 0 0;
    font-size: 11px;
    color: var(--color-danger);
}

/* --------------------------------------------------------------------------
   Inner pages · 内页通用布局
   -------------------------------------------------------------------------- */
.page-hero {
    padding: clamp(56px, 8vw, 108px) 0 clamp(48px, 6vw, 84px);
    border-bottom: var(--rule) solid var(--color-line);
}

.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.04em;
    color: var(--color-muted-2);
}

.breadcrumb a:hover {
    color: var(--color-accent);
}

.breadcrumb span {
    color: var(--color-line-strong);
}

.page-hero h1 {
    max-width: 18ch;
    margin: 22px 0 22px;
    font-size: var(--text-3xl);
    line-height: 1.06;
    overflow-wrap: anywhere;
}

.page-hero .page-lead {
    max-width: 48rem;
    color: var(--color-muted);
    font-size: var(--text-md);
    line-height: 1.9;
}

.page-hero .page-aside {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px 22px;
    margin-top: 30px;
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--color-muted-2);
    letter-spacing: 0.04em;
}

.page-hero .page-aside strong {
    font-weight: 400;
    color: var(--color-accent);
}

/* Services */
.services-intro {
    display: grid;
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: clamp(32px, 6vw, 96px);
    padding-block: clamp(56px, 8vw, 100px);
}

.services-intro h2 {
    font-size: var(--text-2xl);
    max-width: 12ch;
}

.services-intro-copy {
    display: grid;
    gap: var(--space-5);
    color: var(--color-muted);
    font-size: var(--text-sm);
    line-height: 1.9;
    max-width: 58ch;
}

.service-detail {
    display: grid;
    grid-template-columns: 80px minmax(0, 0.78fr) minmax(0, 1.22fr);
    gap: clamp(24px, 4vw, 56px);
    padding: clamp(44px, 6vw, 76px) 0;
    border-top: var(--rule) solid var(--color-line);
    scroll-margin-top: calc(var(--header-h) + 24px);
}

.service-number {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--color-accent);
}

.service-title h2 {
    font-size: clamp(1.9rem, 3.2vw, 2.7rem);
    margin-bottom: 8px;
}

.service-title .service-en {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.08em;
    color: var(--color-muted-2);
    text-transform: uppercase;
}

.service-title .service-lead {
    margin-top: 20px;
    color: var(--color-muted);
    font-size: var(--text-sm);
    line-height: 1.85;
    max-width: 38ch;
}

.service-lists {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-8);
}

.service-list h3 {
    font-family: var(--font-sans);
    font-size: var(--text-xs);
    font-weight: 500;
    letter-spacing: 0.04em;
    color: var(--color-muted-2);
    margin-bottom: 10px;
}

.service-list li {
    position: relative;
    padding: 7px 0 7px 16px;
    border-top: var(--rule) solid var(--color-line);
    font-size: var(--text-sm);
    color: var(--color-ink-2);
}

.service-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 18px;
    width: 5px;
    height: 1px;
    background: var(--color-accent);
}

.services-process {
    background: var(--color-paper-2);
}

.faq-list {
    border-bottom: var(--rule) solid var(--color-line);
}

.faq-list details {
    border-top: var(--rule) solid var(--color-line);
}

.faq-list summary {
    position: relative;
    padding: 20px 40px 20px 0;
    font-size: var(--text-base);
    cursor: pointer;
    list-style: none;
}

.faq-list summary::-webkit-details-marker {
    display: none;
}

.faq-list summary::after {
    content: "+";
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    font-family: var(--font-mono);
    color: var(--color-accent);
}

.faq-list details[open] summary::after {
    content: "−";
}

.faq-list p {
    max-width: 68ch;
    padding: 0 0 22px;
    color: var(--color-muted);
    font-size: var(--text-sm);
    line-height: 1.85;
}

/* Cases */
.case-index {
    padding-block: clamp(48px, 7vw, 88px);
}

.case-card {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(28px, 5vw, 72px);
    align-items: center;
    padding-block: clamp(36px, 5vw, 64px);
    border-bottom: var(--rule) solid var(--color-line);
}

.case-card:first-child {
    border-top: var(--rule) solid var(--color-line);
}

.case-card .case-image {
    display: block;
    aspect-ratio: 16 / 10;
    border: var(--rule) solid var(--color-line-strong);
    overflow: hidden;
    background: var(--color-paper-2);
}

.case-card .case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 700ms var(--ease-out);
}

.case-card .case-image:hover img {
    transform: scale(1.025);
}

.case-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 14px;
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--color-muted-2);
    letter-spacing: 0.04em;
}

.case-meta span {
    color: var(--color-accent);
}

.case-copy h2 {
    font-size: clamp(1.7rem, 3vw, 2.5rem);
    margin: 16px 0;
}

.case-copy > p {
    color: var(--color-muted);
    font-size: var(--text-sm);
    line-height: 1.85;
    margin-bottom: 22px;
}

.case-detail-hero {
    padding-bottom: clamp(40px, 5vw, 68px);
}

.case-cover {
    border: var(--rule) solid var(--color-line-strong);
    margin-top: clamp(32px, 5vw, 56px);
    background: var(--color-paper-2);
}

.case-cover img {
    width: 100%;
    height: auto;
}

.case-body {
    padding-block: clamp(48px, 7vw, 92px);
}

.case-facts {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    border-top: var(--rule) solid var(--color-line-strong);
    border-bottom: var(--rule) solid var(--color-line);
    margin-bottom: clamp(40px, 6vw, 72px);
}

.case-facts div {
    padding: 18px 16px 18px 0;
    border-right: var(--rule) solid var(--color-line);
    min-width: 0;
}

.case-facts div:last-child {
    border-right: 0;
}

.case-facts dt {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--color-muted-2);
    margin-bottom: 4px;
}

.case-facts dd {
    font-size: var(--text-sm);
    color: var(--color-ink);
}

.case-story {
    display: grid;
    grid-template-columns: minmax(0, 0.7fr) minmax(0, 1.3fr);
    gap: clamp(32px, 6vw, 96px);
    padding-top: clamp(32px, 5vw, 56px);
}

.case-story h2 {
    font-size: var(--text-xl);
    margin-bottom: 22px;
}

.case-story p {
    max-width: 66ch;
    color: var(--color-muted);
    line-height: 1.9;
    font-size: var(--text-base);
}

.case-scope {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 var(--space-8);
    margin-top: 36px;
}

.case-scope li {
    padding: 12px 0;
    border-top: var(--rule) solid var(--color-line);
    font-size: var(--text-sm);
    color: var(--color-ink-2);
}

.case-result {
    margin-top: 40px;
    padding: 24px;
    border-left: 2px solid var(--color-accent);
    background: var(--color-paper-2);
}

.case-result h3 {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.08em;
    color: var(--color-accent);
    margin-bottom: 8px;
}

.case-result p {
    color: var(--color-ink-2);
    font-size: var(--text-sm);
    line-height: 1.85;
}

/* About */
.about-story {
    display: grid;
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    gap: clamp(36px, 7vw, 110px);
    padding-block: clamp(56px, 8vw, 100px);
}

.about-story h2 {
    font-size: var(--text-2xl);
    max-width: 12ch;
}

.about-logo {
    width: min(100%, 360px);
    height: auto;
    margin-bottom: 38px;
}

.about-principles-section {
    padding-top: clamp(48px, 6vw, 80px);
}

.contact-note {
    margin-top: 24px;
}

.about-prose {
    color: var(--color-muted);
    font-size: var(--text-base);
    line-height: 1.95;
}

.about-prose p + p {
    margin-top: 18px;
}

.about-prose strong {
    color: var(--color-ink);
    font-weight: 500;
}

.about-principles {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 var(--space-8);
    margin-top: clamp(48px, 7vw, 84px);
    border-top: var(--rule) solid var(--color-line-strong);
}

.about-principles article {
    padding: 24px 0;
    border-bottom: var(--rule) solid var(--color-line);
}

.about-principles span {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--color-accent);
}

.about-principles h3 {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    margin: 12px 0 8px;
    letter-spacing: 0;
}

.about-principles p {
    color: var(--color-muted);
    font-size: var(--text-sm);
    line-height: 1.8;
}

.about-facts {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 var(--space-8);
    border-top: var(--rule) solid var(--color-line);
    border-bottom: var(--rule) solid var(--color-line);
    margin-top: clamp(40px, 6vw, 72px);
}

.about-facts div {
    padding: 22px 0;
    border-right: var(--rule) solid var(--color-line);
}

.about-facts div:last-child {
    border-right: 0;
}

.about-facts dt {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--color-muted-2);
    margin-bottom: 6px;
}

.about-facts dd {
    font-size: var(--text-sm);
    color: var(--color-ink);
}

/* Insights index */
.insight-index {
    padding-block: clamp(48px, 7vw, 88px);
}

.insight-index-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 clamp(36px, 6vw, 80px);
    border-top: var(--rule) solid var(--color-line-strong);
}

.article-card {
    padding: 26px 0 30px;
    border-bottom: var(--rule) solid var(--color-line);
    min-width: 0;
}

.article-card-meta {
    display: flex;
    gap: 14px;
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--color-muted-2);
}

.article-card-meta span {
    color: var(--color-accent);
}

.article-card h2 {
    font-size: clamp(1.35rem, 2.2vw, 1.8rem);
    line-height: 1.4;
    margin: 15px 0 12px;
}

.article-card h2 a:hover {
    color: var(--color-accent);
}

.article-card p {
    color: var(--color-muted);
    font-size: var(--text-sm);
    line-height: 1.8;
    max-width: 54ch;
}

/* Article */
.article-head {
    padding: clamp(48px, 7vw, 90px) 0 clamp(32px, 5vw, 52px);
    border-bottom: var(--rule) solid var(--color-line);
}

.article-head h1 {
    max-width: 20ch;
    font-size: var(--text-2xl);
    line-height: 1.18;
    margin: 20px 0;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 18px;
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--color-muted-2);
}

.article-meta span {
    color: var(--color-accent);
}

.article-body {
    padding-block: clamp(40px, 6vw, 72px);
}

.prose {
    max-width: 720px;
    margin-inline: auto;
}

.prose p {
    color: var(--color-ink-2);
    font-size: var(--text-base);
    line-height: 2;
    margin-bottom: 1.45em;
}

.prose p:first-child {
    color: var(--color-ink);
    font-size: var(--text-md);
}

.article-foot {
    max-width: 720px;
    margin: 36px auto 0;
    padding-top: 24px;
    border-top: var(--rule) solid var(--color-line);
}

/* Contact page */
.contact-page-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    gap: clamp(36px, 7vw, 110px);
    padding-block: clamp(48px, 7vw, 88px);
}

.contact-card {
    border-top: var(--rule) solid var(--color-line-strong);
    margin-top: 32px;
}

.contact-card div {
    padding: 17px 0;
    border-bottom: var(--rule) solid var(--color-line);
}

.contact-card dt {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--color-muted-2);
    margin-bottom: 5px;
}

.contact-card dd {
    font-size: var(--text-sm);
    color: var(--color-ink-2);
    line-height: 1.75;
    overflow-wrap: anywhere;
}

.contact-card a:hover {
    color: var(--color-accent);
}

.contact-page-form {
    background: var(--color-paper);
    border: var(--rule) solid var(--color-line-strong);
    padding: clamp(22px, 3.2vw, 38px);
}

.contact-page-form h2 {
    font-size: var(--text-xl);
    margin-bottom: 10px;
}

.contact-page-form > p {
    color: var(--color-muted);
    font-size: var(--text-sm);
    margin-bottom: 28px;
}

.cities-page {
    padding-block: clamp(40px, 6vw, 72px);
}

.city-search {
    position: sticky;
    top: var(--header-h);
    z-index: 5;
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 0;
    background: var(--color-paper);
    border-bottom: var(--rule) solid var(--color-line);
}

.city-search label {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--color-muted-2);
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.city-search input {
    width: min(100%, 340px);
    min-height: 44px;
    border: var(--rule) solid var(--color-line-strong);
    background: transparent;
    padding: 10px 12px;
    font-size: var(--text-sm);
}

.city-search input:focus {
    outline: none;
    border-color: var(--color-ink);
}

.city-search-count {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--color-muted-2);
    margin-left: auto;
}

.city-groups {
    padding-top: 20px;
}

.city-group {
    display: grid;
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 24px;
    padding: 24px 0;
    border-bottom: var(--rule) solid var(--color-line);
}

.city-group h2 {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    font-weight: 600;
    letter-spacing: 0;
    display: flex;
    align-items: baseline;
    gap: 8px;
}

.city-group h2 span {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--color-muted-2);
    font-weight: 400;
}

.city-list {
    display: flex;
    flex-wrap: wrap;
    gap: 4px 0;
}

.city-list li {
    width: 25%;
    min-width: 120px;
}

.city-list a {
    display: block;
    padding: 4px 8px 4px 0;
    font-size: var(--text-sm);
    color: var(--color-ink-2);
    transition: color var(--dur-fast) var(--ease-out);
}

.city-list a:hover {
    color: var(--color-accent);
}

.city-empty {
    display: none;
    padding: 40px 0;
    color: var(--color-muted);
    font-size: var(--text-sm);
}

.city-empty.is-visible {
    display: block;
}

/* Legal */
.legal-page {
    padding-block: clamp(48px, 7vw, 88px);
}

.legal-page .prose h2 {
    font-size: var(--text-lg);
    margin: 40px 0 14px;
}

.legal-page .prose h2:first-child {
    margin-top: 0;
}

.legal-page .prose p,
.legal-page .prose li {
    color: var(--color-muted);
    font-size: var(--text-sm);
    line-height: 1.9;
}

.legal-page .prose ul {
    margin: 0 0 1.4em 1.2em;
    list-style: disc;
}

/* --------------------------------------------------------------------------
   Motion · 动效与减少动态效果
   -------------------------------------------------------------------------- */
@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes rise-in {
    from { opacity: 0; transform: translateY(26px); }
    to { opacity: 1; transform: none; }
}

@keyframes fade-up {
    from { opacity: 0; transform: translateY(14px); }
    to { opacity: 1; transform: none; }
}

@keyframes fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes scroll-line {
    0% { transform: translateY(-100%); }
    55%, 100% { transform: translateY(100%); }
}

.reveal-prep {
    opacity: 0;
    transform: translateY(16px);
}

.reveal-in {
    opacity: 1;
    transform: none;
    transition: opacity 680ms var(--ease-out), transform 680ms var(--ease-out);
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    .orbit-outer {
        animation: none;
    }
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    .reveal-prep {
        opacity: 1;
        transform: none;
    }
}

/* --------------------------------------------------------------------------
   Responsive · 响应式断点
   -------------------------------------------------------------------------- */
@media (max-width: 1160px) {
    .desktop-nav {
        gap: 16px;
    }
    .head-phone {
        display: none;
    }
    .statement-grid {
        grid-template-columns: 120px minmax(0, 1fr) 210px;
    }
    .principles-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 24px;
    }
    .principles-grid article:nth-child(4),
    .principles-grid article:nth-child(5) {
        margin-top: 10px;
    }
}

@media (max-width: 980px) {
    :root {
        --header-h: 72px;
    }
    .desktop-nav,
    .head-cta {
        display: none;
    }
    .head-actions {
        margin-left: auto;
    }
    .menu-toggle {
        display: flex;
    }
    .hero-grid {
        grid-template-columns: minmax(0, 1fr);
        min-height: 0;
        gap: 22px;
        padding-bottom: 44px;
    }
    .hero-title {
        font-size: clamp(4.2rem, 14vw, 7rem);
    }
    .hero-title-city {
        font-size: clamp(2.8rem, 8vw, 4.6rem);
    }
    .hero-art {
        align-items: flex-start;
        max-width: 560px;
        margin-top: 10px;
    }
    .hero-art-note {
        text-align: left;
    }
    .hero-art-label {
        left: auto;
        right: 0;
    }
    .hero-scroll {
        display: none;
    }
    .statement-grid {
        grid-template-columns: 1fr;
        gap: 26px;
    }
    .statement-main h2 {
        max-width: 18ch;
    }
    .statement-copy {
        max-width: 60ch;
    }
    .statement-facts {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 0 24px;
    }
    .section-head {
        grid-template-columns: 1fr;
        gap: 18px;
    }
    .section-head h2 {
        max-width: 18ch;
    }
    .capability-row {
        grid-template-columns: 44px minmax(0, 1fr) 34px;
        gap: 16px;
    }
    .capability-row > p {
        grid-column: 2 / 3;
        margin-top: -14px;
    }
    .capability-arrow {
        grid-column: 3;
        grid-row: 1;
    }
    .work-item,
    .work-item.is-reverse {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    .work-item.is-reverse .work-image {
        order: 0;
    }
    .work-image {
        aspect-ratio: 16 / 9;
    }
    .cosmology-shell {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    .cosmology-copy > p:not(.index-label) {
        max-width: 52ch;
    }
    .cosmology-stage {
        min-height: 620px;
        max-width: 700px;
        margin-inline: auto;
        width: 100%;
    }
    .process-grid,
    .city-network-grid,
    .contact-grid,
    .local-context-grid,
    .services-intro,
    .about-story,
    .contact-page-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .process-intro {
        position: static;
    }
    .foot-main {
        grid-template-columns: 1fr;
        gap: 36px;
    }
    .foot-cols {
        max-width: 700px;
    }
    .case-card {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    .case-card .case-image {
        max-width: 760px;
    }
    .case-detail-hero .case-cover {
        margin-top: 32px;
    }
    .service-detail {
        grid-template-columns: 48px minmax(0, 1fr);
    }
    .service-lists {
        grid-column: 2 / 3;
        margin-top: 12px;
    }
    .case-story {
        grid-template-columns: 1fr;
        gap: 28px;
    }
    .case-facts {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .case-facts div:nth-child(2) {
        border-right: 0;
    }
    .case-facts div:nth-child(3),
    .case-facts div:nth-child(4) {
        border-top: var(--rule) solid var(--color-line);
    }
    .article-head h1 {
        font-size: clamp(2rem, 5.2vw, 3.2rem);
    }
}

@media (max-width: 760px) {
    body {
        font-size: 1rem;
    }
    .cosmology-stage {
        min-height: 0;
        display: flex;
        flex-direction: column;
        align-items: stretch;
        padding-top: 8px;
    }
    .cosmology-grid,
    .cosmology-orbit,
    .cosmology-node {
        display: none;
    }
    .cosmology-core {
        position: relative;
        left: auto;
        top: auto;
        transform: none;
        width: 240px;
        height: 240px;
        margin: 8px auto 26px;
        flex: none;
    }
    .cosmology-core strong {
        font-size: 1.8rem;
    }
    .cosmology-note {
        position: static;
        width: 100%;
        margin-bottom: 8px;
        backdrop-filter: none;
    }
    .cosmology-note p {
        max-width: 46ch;
    }
    .brand-logo {
        width: 132px;
    }
    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }
    .hero-copy {
        padding-top: 18px;
    }
    .hero-title {
        font-size: clamp(3.6rem, 17vw, 5.4rem);
        letter-spacing: -0.06em;
    }
    .hero-title-city {
        font-size: clamp(2.45rem, 10vw, 3.6rem);
    }
    .hero-lead {
        font-size: 1rem;
    }
    .hero-actions {
        gap: 18px;
    }
    .hero-foot {
        grid-template-columns: 1fr 1fr;
        gap: 16px;
    }
    .hero-foot div:last-child {
        grid-column: 1 / -1;
    }
    .hero-art {
        max-width: 430px;
    }
    .statement-copy {
        grid-template-columns: 1fr;
        gap: 14px;
    }
    .statement-facts {
        grid-template-columns: 1fr 1fr;
        gap: 0 18px;
    }
    .capability-row {
        grid-template-columns: 34px minmax(0, 1fr) 34px;
        padding: 20px 0;
    }
    .capability-name {
        gap: 6px;
    }
    .capability-row > p {
        font-size: var(--text-xs);
    }
    .process-list li {
        grid-template-columns: 38px minmax(0, 1fr);
    }
    .principles-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .insight-row {
        grid-template-columns: 86px minmax(0, 1fr) 22px;
        gap: 8px 12px;
    }
    .insight-cat {
        grid-column: 1;
        grid-row: 2;
    }
    .insight-row h3 {
        grid-column: 2;
        grid-row: 1 / 3;
    }
    .insight-arrow {
        grid-column: 3;
        grid-row: 1 / 3;
    }
    .contact-form-wrap,
    .contact-page-form {
        padding: 20px;
    }
    .foot-cols {
        grid-template-columns: 1fr 1fr;
        gap: 28px;
    }
    .foot-contact {
        grid-column: 1 / -1;
    }
    .foot-bottom {
        align-items: flex-start;
        flex-direction: column;
        gap: 10px;
    }
    .service-lists {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .about-principles {
        grid-template-columns: 1fr 1fr;
    }
    .about-facts {
        grid-template-columns: 1fr 1fr;
    }
    .about-facts div:nth-child(2) {
        border-right: 0;
    }
    .about-facts div:nth-child(3),
    .about-facts div:nth-child(4) {
        border-top: var(--rule) solid var(--color-line);
    }
    .insight-index-grid {
        grid-template-columns: 1fr;
    }
    .city-list li {
        width: 50%;
    }
    .city-group {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    .city-search {
        flex-wrap: wrap;
        gap: 8px 12px;
    }
    .city-search input {
        width: 100%;
    }
    .city-search-count {
        margin-left: 0;
    }
    .case-scope {
        grid-template-columns: 1fr;
    }
    .page-hero h1 {
        font-size: clamp(2.5rem, 10vw, 4rem);
    }
    .page-hero .page-lead {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .shell {
        padding-inline: 18px;
    }
    .brand-city {
        display: none;
    }
    .hero {
        padding-top: 36px;
    }
    .hero-title {
        font-size: clamp(3.05rem, 17vw, 4.2rem);
    }
    .hero-title-city {
        font-size: clamp(2.1rem, 10vw, 2.8rem);
    }
    .hero-actions .btn {
        width: 100%;
    }
    .hero-actions {
        align-items: flex-start;
        flex-direction: column;
    }
    .btn {
        min-height: 48px;
    }
    .section {
        padding-block: 64px;
    }
    .principles-grid {
        grid-template-columns: 1fr;
    }
    .principles-grid article:nth-child(4),
    .principles-grid article:nth-child(5) {
        margin-top: 0;
    }
    .foot-cols {
        grid-template-columns: 1fr;
    }
    .foot-contact {
        grid-column: auto;
    }
    .foot-slogan {
        font-size: 1.7rem;
    }
    .city-list li {
        width: 100%;
    }
    .ai-dock {
        right: 12px;
        bottom: 12px;
    }
    .ai-panel {
        inset: 0;
        width: 100%;
        max-height: none;
        border: 0;
    }
    .ai-panel-head {
        padding-top: max(18px, env(safe-area-inset-top));
    }
    .ai-form {
        padding-bottom: max(16px, env(safe-area-inset-bottom));
    }
    .case-facts,
    .about-facts {
        grid-template-columns: 1fr;
    }
    .case-facts div,
    .case-facts div:nth-child(2),
    .about-facts div,
    .about-facts div:nth-child(2) {
        border-right: 0;
    }
    .case-facts div + div,
    .about-facts div + div {
        border-top: var(--rule) solid var(--color-line);
    }
    .case-result {
        padding: 18px;
    }
    .article-head h1 {
        font-size: 1.85rem;
    }
    .insight-row {
        grid-template-columns: 1fr 20px;
    }
    .insight-date {
        grid-column: 1;
        grid-row: 1;
    }
    .insight-cat {
        display: none;
    }
    .insight-row h3 {
        grid-column: 1;
        grid-row: 2;
        font-size: 1.12rem;
    }
    .insight-arrow {
        grid-column: 2;
        grid-row: 2;
    }
}