/* Docs-style project pages. Keep the homepage visual language: monochrome, thick lines, soft glass, mono hints. */
:root {
    --font-display: 'Inter', 'Noto Sans SC', sans-serif;
    --font-body: 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    --font-mono: 'IBM Plex Mono', 'Noto Sans SC', 'Microsoft YaHei', monospace;
    --bg: #ffffff;
    --ink: #0d0d0d;
    --sub-text: #666666;
    --btn-hover-text: #ffffff;
    --modal-bg: rgba(255, 255, 255, 0.85);
    --modal-border: #e5e5e5;
    --modal-text: #0d0d0d;
    --item-hover: #f3f3f3;
    --item-hover-strong: #e7e7e7;
    --icon-color: #0d0d0d;
    --scrollbar-thumb: rgba(13, 13, 13, 0.32);
    --scrollbar-thumb-hover: rgba(13, 13, 13, 0.48);
    --panel-bg: rgba(255, 255, 255, 0.78);
    --panel-bg-soft: rgba(255, 255, 255, 0.58);
    --hairline: rgba(13, 13, 13, 0.14);
    --code-bg: rgba(13, 13, 13, 0.045);
    --code-border: rgba(13, 13, 13, 0.12);
    --paper-border: #0d0d0d;
    --nav-height: 76px;
    --motion-enter-duration: 600ms;
    --motion-hover-duration: 180ms;
    --motion-press-duration: 120ms;
    --motion-page-out-duration: 180ms;
    --motion-page-in-duration: 260ms;
    --motion-theme-duration: 520ms;
    --motion-glitch-base-duration: 320ms;
    --motion-glitch-before-duration: 380ms;
    --motion-glitch-after-duration: 420ms;
    --motion-ambient-duration: 300ms;
    --motion-ease-out: cubic-bezier(0.22, 1, 0.36, 1);
    --motion-ease-standard: cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg: #0a0a0a;
    --ink: #ededed;
    --sub-text: #888888;
    --btn-hover-text: #000000;
    --modal-bg: rgba(20, 20, 20, 0.85);
    --modal-border: #333;
    --modal-text: #ededed;
    --item-hover: #222;
    --item-hover-strong: #2d2d2d;
    --icon-color: #ededed;
    --scrollbar-thumb: rgba(237, 237, 237, 0.26);
    --scrollbar-thumb-hover: rgba(237, 237, 237, 0.42);
    --panel-bg: rgba(20, 20, 20, 0.80);
    --panel-bg-soft: rgba(20, 20, 20, 0.60);
    --hairline: rgba(237, 237, 237, 0.14);
    --code-bg: rgba(237, 237, 237, 0.055);
    --code-border: rgba(237, 237, 237, 0.12);
    --paper-border: rgba(237, 237, 237, 0.26);
}

* { box-sizing: border-box; }
html { scroll-behavior: auto; }

/* 骨架屏 */
.page-skeleton {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: grid;
    place-items: start center;
    padding: calc(var(--nav-height) + 28px) 22px 40px;
    background: var(--bg);
    transition: opacity var(--motion-ambient-duration) ease, visibility var(--motion-ambient-duration) ease;
}

.page-skeleton.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.skeleton-paper {
    width: min(1080px, 100%);
    border: 2px solid var(--paper-border);
    border-radius: 20px;
    padding: clamp(26px, 5vw, 54px);
    background: var(--panel-bg);
    box-shadow: 8px 8px 0 rgba(128, 128, 128, 0.14);
}

.skeleton-line,
.skeleton-grid div,
.skeleton-card {
    position: relative;
    overflow: hidden;
    border-radius: 12px;
    background: var(--code-bg);
}

.skeleton-line::after,
.skeleton-grid div::after,
.skeleton-card::after {
    content: '';
    position: absolute;
    inset: 0;
    transform: translateX(-100%);
    background: linear-gradient(90deg, transparent, rgba(128, 128, 128, 0.16), transparent);
    animation: skeletonShimmer 1.1s infinite;
}

.skeleton-title { width: 46%; height: 64px; margin-bottom: 18px; }
.skeleton-line:not(.skeleton-title) { width: 70%; height: 18px; margin-bottom: 26px; }
.skeleton-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin-bottom: 30px; }
.skeleton-grid div { height: 58px; }
.skeleton-card { height: 78px; margin-top: 12px; }

@keyframes skeletonShimmer {
    to { transform: translateX(100%); }
}

::view-transition-old(root) {
    animation: pageFadeOut var(--motion-page-out-duration) ease both;
}

::view-transition-new(root) {
    animation: pageFadeIn var(--motion-page-in-duration) var(--motion-ease-out) both;
}

@keyframes pageFadeOut {
    to { opacity: 0; transform: translateY(-6px); }
}

@keyframes pageFadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 滚动进度条 */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: var(--ink);
    width: 0%;
    z-index: 999;
    transition: width 0.1s ease-out;
}

/* 光标聚光灯效果 */
.spotlight {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 2;
    opacity: 0;
    transition: opacity var(--motion-ambient-duration) ease;
}

.spotlight.active {
    opacity: 1;
}

body {
    margin: 0;
    min-height: 100vh;
    background-color: var(--bg);
    color: var(--ink);
    font-family: var(--font-body);
    transition: background-color var(--motion-ambient-duration) ease, color var(--motion-ambient-duration) ease;
    overflow-x: hidden;
    cursor: default;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.03'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 1;
    opacity: 1;
}

body.page-leaving {
    opacity: 0;
    transform: translateY(-6px);
    transition: opacity var(--motion-page-out-duration) ease, transform var(--motion-page-out-duration) ease;
}

[data-theme="dark"] body::before {
    opacity: 0.8;
}

a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }

a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--ink);
    outline-offset: 3px;
    box-shadow: inset 0 0 0 2px var(--bg), inset 0 0 0 4px var(--ink);
}

html.theme-transitioning *,
html.theme-transitioning *::before,
html.theme-transitioning *::after {
    transition-duration: 0s !important;
    user-select: none !important;
    -webkit-user-select: none !important;
}

::view-transition-old(root),
::view-transition-new(root) {
    mix-blend-mode: normal;
}

html.theme-transitioning::view-transition-new(root) {
    animation: themeReveal var(--motion-theme-duration) var(--motion-ease-out) both;
    clip-path: circle(0 at var(--theme-wipe-x, 50vw) var(--theme-wipe-y, 50vh));
}

html.theme-transitioning::view-transition-old(root) {
    animation: themeHold var(--motion-theme-duration) var(--motion-ease-out) both;
}

@keyframes themeReveal {
    from { clip-path: circle(0 at var(--theme-wipe-x, 50vw) var(--theme-wipe-y, 50vh)); }
    to { clip-path: circle(var(--theme-wipe-radius, 150vmax) at var(--theme-wipe-x, 50vw) var(--theme-wipe-y, 50vh)); }
}

@keyframes themeHold { from, to { clip-path: inset(0); } }

#particle-canvas {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

.docs-topbar {
    position: sticky;
    top: 0;
    z-index: 50;
    height: var(--nav-height);
    border-bottom: 1px solid var(--hairline);
    background: var(--panel-bg);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
}

.docs-topbar::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.04'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: -1;
}

.topbar-inner {
    width: 100%;
    max-width: 1540px;
    height: 100%;
    margin: 0 auto;
    padding: 0 22px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.brand-area {
    display: flex;
    align-items: center;
    gap: 14px;
    min-width: 0;
}

.logo {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 20px;
    text-decoration: none;
    user-select: none;
    transition: opacity 0.2s, transform 0.2s;
    white-space: nowrap;
}
.logo:hover { opacity: 0.6; }
.logo:active { transform: scale(0.95); }

.breadcrumb {
    min-width: 0;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--sub-text);
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.2;
    white-space: nowrap;
}
.breadcrumb a {
    color: var(--sub-text);
    text-decoration: none;
    position: relative;
    transition: color 0.2s;
}
.breadcrumb a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--ink);
    transition: width 0.2s ease;
}
.breadcrumb a:hover {
    color: var(--ink);
}
.breadcrumb a:hover::after {
    width: 100%;
}
.breadcrumb-current {
    overflow: hidden;
    text-overflow: ellipsis;
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 0 0 auto;
}

.text-link,
.icon-btn,
.mobile-menu-btn {
    min-height: 44px;
    border-radius: 10px;
    color: var(--ink);
    cursor: pointer;
    transition: background 0.2s, color 0.2s, border-color 0.2s, opacity 0.2s;
}

.text-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 12px;
    border: 2px solid var(--ink);
    background: rgba(255,255,255,0.05);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 800;
}
.text-link:hover { background: var(--ink); color: var(--btn-hover-text); }

.icon-btn,
.mobile-menu-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
    border: none;
    background: transparent;
}
.icon-btn:hover,
.mobile-menu-btn:hover { background-color: rgba(128, 128, 128, 0.1); }
.icon-btn svg,
.mobile-menu-btn svg {
    width: 24px;
    height: 24px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}
.mobile-menu-btn { display: none; }

.docs-layout {
    width: 100%;
    max-width: 1540px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr) 180px;
    gap: 22px;
    padding: 28px 22px 70px;
}

.sidebar,
.toc {
    position: sticky;
    top: calc(var(--nav-height) + 22px);
    align-self: start;
    max-height: calc(100dvh - var(--nav-height) - 44px);
    overflow: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--scrollbar-thumb) transparent;
}
.sidebar::-webkit-scrollbar,
.toc::-webkit-scrollbar { width: 8px; height: 8px; }
.sidebar::-webkit-scrollbar-thumb,
.toc::-webkit-scrollbar-thumb {
    background-color: var(--scrollbar-thumb);
    border: 2px solid transparent;
    border-radius: 999px;
    background-clip: padding-box;
}

.sidebar-card,
.toc-card {
    border: 1px solid var(--hairline);
    border-radius: 16px;
    background: var(--panel-bg-soft);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    padding: 12px;
}

.nav-group + .nav-group { margin-top: 16px; }
.nav-title,
.toc-title {
    margin: 0 0 8px;
    padding: 0 8px;
    color: var(--sub-text);
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.doc-nav {
    display: grid;
    gap: 4px;
}

.doc-nav a,
.toc-list a {
    display: block;
    border-radius: 10px;
    color: var(--sub-text);
    text-decoration: none;
    font-family: var(--font-mono);
    line-height: 1.45;
    transition: background 0.15s, color 0.15s, box-shadow 0.15s;
}

.doc-nav a {
    padding: 9px 10px;
    font-size: 12px;
}
.doc-nav a span {
    display: block;
    color: var(--ink);
    font-family: var(--font-body);
    font-size: 13px;
    font-weight: 800;
    line-height: 1.25;
}
.doc-nav a small {
    display: block;
    margin-top: 3px;
    color: var(--sub-text);
    font-size: 11px;
}
.doc-nav a:hover,
.toc-list a:hover {
    color: var(--ink);
    background: var(--item-hover);
}

.doc-nav a.active,
.doc-nav a.nav-pressed,
.toc-list a.active {
    color: var(--ink);
    background: var(--item-hover-strong);
    box-shadow: inset 2px 0 0 var(--sub-text);
}

.doc-nav a.active:hover,
.doc-nav a.nav-pressed:hover,
.toc-list a.active:hover {
    background: var(--item-hover-strong);
}

.docs-main {
    min-width: 0;
}

.doc-paper {
    width: 100%;
    max-width: 1080px;
    margin: 0 auto;
    border: 2px solid var(--paper-border);
    border-radius: 20px;
    background: var(--panel-bg);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    box-shadow: 8px 8px 0 rgba(128, 128, 128, 0.14);
    overflow: visible;
    position: relative;
}

.doc-paper::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 18px;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.025'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 0;
}

.doc-article {
    padding: clamp(26px, 5vw, 54px);
    position: relative;
    z-index: 1;
}

.doc-kicker {
    margin: 0 0 12px;
    color: var(--sub-text);
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.doc-article h1 {
    margin: 0 0 14px;
    font-family: var(--font-display);
    font-size: clamp(42px, 7vw, 76px);
    line-height: 0.94;
    letter-spacing: -0.055em;
    font-weight: 900;
}

.doc-glitch-title {
    position: relative;
    display: inline-block;
    max-width: 100%;
    user-select: none;
    -webkit-user-select: none;
}
.doc-glitch-title:hover {
    animation: docGlitchBase var(--motion-glitch-base-duration) steps(2, end) infinite;
}
.doc-glitch-title:hover::before,
.doc-glitch-title:hover::after {
    content: attr(data-text);
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0.82;
    pointer-events: none;
}
.doc-glitch-title:hover::before {
    color: #ff00ff;
    z-index: -1;
    animation: docGlitchBefore var(--motion-glitch-before-duration) steps(2, end) infinite;
}
.doc-glitch-title:hover::after {
    color: #00ffff;
    z-index: -2;
    animation: docGlitchAfter var(--motion-glitch-after-duration) steps(2, end) infinite;
}

@keyframes docGlitchBase {
    0%, 100% { transform: translate(0, 0); }
    30% { transform: translate(-1px, 0); }
    60% { transform: translate(1px, 0); }
}
@keyframes docGlitchBefore {
    0% { clip-path: polygon(0 0, 100% 0, 100% 32%, 0 32%); transform: translate(-2px, 0); }
    45% { clip-path: polygon(0 18%, 100% 18%, 100% 58%, 0 58%); transform: translate(2px, -1px); }
    100% { clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%); transform: translate(0, 0); }
}
@keyframes docGlitchAfter {
    0% { clip-path: polygon(0 66%, 100% 66%, 100% 100%, 0 100%); transform: translate(2px, 0); }
    45% { clip-path: polygon(0 42%, 100% 42%, 100% 82%, 0 82%); transform: translate(-2px, 1px); }
    100% { clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%); transform: translate(0, 0); }
}

.doc-article h2,
.doc-article h3 {
    scroll-margin-top: calc(var(--nav-height) + 24px);
    letter-spacing: -0.025em;
}
.doc-article h2 {
    margin: 42px 0 14px;
    padding-top: 26px;
    border-top: 1px solid var(--hairline);
    font-family: var(--font-display);
    font-size: 28px;
    line-height: 1.12;
    font-weight: 900;
}

.doc-article h3 {
    margin: 28px 0 10px;
    font-size: 18px;
    line-height: 1.25;
    font-weight: 900;
}

.lede {
    max-width: 920px;
    margin: 0 0 24px;
    color: var(--sub-text);
    font-family: var(--font-mono);
    font-size: 15px;
    line-height: 1.85;
    text-align: justify;
    text-justify: inter-character;
}

.doc-article p,
.doc-article li {
    font-size: 16px;
    line-height: 1.82;
}
.doc-article p {
    max-width: 920px;
    margin: 0 0 15px;
    color: var(--modal-text);
    text-align: justify;
    text-justify: inter-character;
}
.doc-article li {
    text-align: justify;
    text-justify: inter-character;
}
.doc-article ul,
.doc-article ol {
    max-width: 920px;
    margin: 0 0 18px;
    padding-left: 1.35em;
    color: var(--modal-text);
}
.doc-article li { margin: 5px 0; }
.doc-article strong { font-weight: 900; }

.meta-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
    margin: 24px 0 30px;
}

.meta-item {
    border: 1px solid var(--hairline);
    border-radius: 14px;
    background: var(--panel-bg-soft);
    padding: 12px;
    min-width: 0;
}
.meta-label {
    display: block;
    margin-bottom: 6px;
    color: var(--sub-text);
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}
.meta-value {
    display: block;
    color: var(--ink);
    font-size: 14px;
    font-weight: 800;
    line-height: 1.35;
    overflow-wrap: anywhere;
    font-family: var(--font-mono);
}

.callout,
.code-block,
.project-card,
.featured-case,
.case-hero {
    border: 1px solid var(--code-border);
    border-radius: 16px;
    background: var(--code-bg);
}

.case-hero {
    max-width: 920px;
    margin: 24px 0 36px;
    padding: 14px;
    display: grid;
    grid-template-columns: minmax(360px, 1.1fr) minmax(0, 0.9fr);
    gap: 22px;
    align-items: stretch;
    position: relative;
    overflow: hidden;
}

.case-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 15% 0%, rgba(128, 128, 128, 0.14), transparent 44%);
    pointer-events: none;
}

.case-hero-media,
.case-hero-content {
    position: relative;
    z-index: 1;
}

.case-hero-media {
    align-self: stretch;
    border: 1px solid var(--hairline);
    border-radius: 14px;
    background: var(--panel-bg-soft);
    overflow: hidden;
    aspect-ratio: auto;
    display: grid;
    place-items: center;
}

.case-hero-media img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center center;
    filter: saturate(0.96) contrast(1.02);
}

.case-hero-content {
    padding: 10px 6px 6px;
    display: flex;
    flex-direction: column;
}

.case-hero-kicker {
    margin: 0 0 10px;
    color: var(--sub-text);
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.case-hero-title {
    margin: 0 0 12px;
    font-family: var(--font-display);
    font-size: clamp(24px, 3vw, 34px);
    line-height: 1.08;
    letter-spacing: -0.045em;
    font-weight: 900;
}

.case-hero-summary {
    margin: 0 0 18px;
    color: var(--modal-text);
    font-size: 15px;
    line-height: 1.75;
}

.case-hero-metrics {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    margin-top: auto;
}

.case-hero-metric {
    min-height: 104px;
    padding: 12px;
    border: 1px solid var(--hairline);
    border-radius: 12px;
    background: var(--panel-bg-soft);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.case-hero-value {
    display: block;
    min-height: 2.05em;
    color: var(--ink);
    font-family: var(--font-mono);
    font-size: clamp(18px, 2.2vw, 28px);
    font-weight: 900;
    line-height: 0.95;
    font-variant-numeric: tabular-nums;
}

.case-hero-label {
    display: block;
    margin-top: 8px;
    color: var(--sub-text);
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.05em;
    line-height: 1.25;
    text-transform: uppercase;
}

.featured-case {
    max-width: 920px;
    margin: 24px 0 34px;
    padding: 14px;
    display: grid;
    grid-template-columns: minmax(260px, 0.92fr) minmax(0, 1.08fr);
    gap: 18px;
    align-items: stretch;
    position: relative;
    overflow: hidden;
}

.featured-case::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 20% 0%, rgba(128, 128, 128, 0.14), transparent 42%);
    pointer-events: none;
}

.featured-case-media,
.featured-case-content {
    position: relative;
    z-index: 1;
}

.featured-case-media {
    min-height: 320px;
    border: 1px solid var(--hairline);
    border-radius: 14px;
    background: var(--panel-bg-soft);
    overflow: hidden;
}

.featured-case-media img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top;
    filter: saturate(0.95) contrast(1.02);
}

.featured-case-content {
    padding: 10px 6px 6px;
    display: flex;
    flex-direction: column;
}

.case-eyebrow {
    margin: 0 0 10px;
    color: var(--sub-text);
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.doc-article .featured-case h3 {
    margin: 0 0 12px;
    max-width: none;
    font-family: var(--font-display);
    font-size: clamp(24px, 3vw, 34px);
    line-height: 1.08;
    letter-spacing: -0.045em;
}

.case-summary {
    margin-bottom: 18px;
}

.case-metrics {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    margin: 4px 0 18px;
}

.case-metric {
    padding: 12px;
    border: 1px solid var(--hairline);
    border-radius: 12px;
    background: var(--panel-bg-soft);
}

.metric-value {
    display: block;
    color: var(--ink);
    font-family: var(--font-mono);
    font-size: clamp(20px, 2.6vw, 30px);
    font-weight: 900;
    line-height: 1;
    font-variant-numeric: tabular-nums;
}

.metric-label {
    display: block;
    margin-top: 7px;
    color: var(--sub-text);
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.case-notes {
    margin-top: auto;
    padding-top: 2px;
}

.doc-article .case-notes p {
    margin-bottom: 9px;
    font-size: 14px;
    line-height: 1.75;
}

.case-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 14px;
}

.doc-link.ghost {
    border-color: var(--code-border);
    background: var(--panel-bg-soft);
}

.index-intro {
    margin-top: -4px;
}

.callout {
    max-width: 920px;
    margin: 24px 0;
    padding: 16px 18px;
    border-left: 4px solid var(--ink);
    color: var(--modal-text);
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.75;
}

.code-block {
    margin: 20px 0;
    padding: 16px;
    overflow-x: auto;
    color: var(--modal-text);
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.7;
    white-space: pre;
}

.project-list {
    display: grid;
    gap: 12px;
    margin: 24px 0 6px;
    perspective: 1200px;
}

.project-card {
    --project-card-entry-y: 30px;
    --project-card-hover-y: 0px;
    --project-card-hover-rotate-x: 0deg;
    --project-card-hover-rotate-y: 0deg;
    --project-card-transform-duration: var(--motion-enter-duration);
    --project-card-transform-ease: var(--motion-ease-out);
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 16px;
    align-items: center;
    padding: 16px;
    color: var(--ink);
    text-decoration: none;
    transition: opacity var(--motion-enter-duration) var(--motion-ease-out), background var(--motion-hover-duration) var(--motion-ease-standard), transform var(--project-card-transform-duration) var(--project-card-transform-ease), border-color var(--motion-hover-duration) var(--motion-ease-standard), box-shadow var(--motion-hover-duration) var(--motion-ease-standard), padding-right var(--motion-hover-duration) ease;
    transform-style: preserve-3d;
    outline: none;
    opacity: 0;
    transform: translateY(calc(var(--project-card-entry-y) + var(--project-card-hover-y))) rotateX(var(--project-card-hover-rotate-x)) rotateY(var(--project-card-hover-rotate-y));
    position: relative;
    overflow: visible;
}

.project-card.animate-in {
    --project-card-entry-y: 0px;
    opacity: 1;
}

.project-card:focus {
    outline: 2px solid var(--ink);
    outline-offset: 2px;
}
.project-card:hover {
    --project-card-hover-y: -4px;
    --project-card-hover-rotate-x: 4deg;
    --project-card-hover-rotate-y: -2deg;
    --project-card-transform-duration: var(--motion-hover-duration);
    --project-card-transform-ease: var(--motion-ease-standard);
    background: var(--item-hover-strong);
    border-color: var(--ink);
    box-shadow: 0 0 0 1px var(--ink), 0 12px 28px -8px rgba(13, 13, 13, 0.3);
}
[data-theme="dark"] .project-card:hover {
    box-shadow: 0 0 0 1px var(--ink), 0 12px 28px -8px rgba(237, 237, 237, 0.25);
}
.project-card-title {
    display: block;
    margin: 0 0 4px;
    font-size: 17px;
    font-weight: 900;
}
.project-card-desc {
    display: block;
    margin: 0;
    color: var(--sub-text);
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.55;
}

.count-up {
    color: var(--ink);
    font-weight: 900;
    font-variant-numeric: tabular-nums;
}

.project-card-preview {
    position: absolute;
    top: 50%;
    right: 14px;
    width: 186px;
    height: 104px;
    border: 1px solid var(--hairline);
    border-radius: 12px;
    background: var(--code-bg);
    box-shadow: 0 14px 30px -20px rgba(0, 0, 0, 0.55);
    opacity: 0;
    overflow: hidden;
    transform: translate3d(10px, -50%, 0) scale(0.96);
    transition: opacity var(--motion-hover-duration) ease, transform var(--motion-hover-duration) ease;
    pointer-events: none;
}

.project-card-preview img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
    opacity: 1;
    filter: saturate(0.96) contrast(1.02);
}

.project-card:hover .project-card-preview,
.project-card:focus .project-card-preview {
    opacity: 1;
    transform: translate3d(0, -50%, 0) scale(1);
}

.project-card:hover,
.project-card:focus {
    padding-right: 220px;
}

@media (hover: none), (max-width: 1120px) {
    .project-card-preview { display: none; }
    .project-card:hover,
    .project-card:focus { padding-right: 16px; }
}

.project-card-arrow {
    color: var(--sub-text);
    font-family: var(--font-mono);
    font-size: 13px;
}

.link-row,
.doc-pagination {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.link-row { margin-top: 22px; }
.doc-link,
.page-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 44px;
    padding: 10px 14px;
    border: 2px solid var(--ink);
    border-radius: 12px;
    color: var(--ink);
    background: rgba(255,255,255,0.05);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 800;
    transition: background var(--motion-hover-duration), color var(--motion-hover-duration), transform var(--motion-hover-duration), box-shadow var(--motion-hover-duration);
}
.doc-link:hover,
.page-link:hover {
    background: var(--ink);
    color: var(--btn-hover-text);
    transform: translateY(-1px);
    box-shadow: 0 10px 20px -14px rgba(0,0,0,0.5);
}
.doc-link svg,
.page-link svg {
    width: 16px;
    height: 16px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.doc-pagination {
    margin-top: 44px;
    padding-top: 22px;
    border-top: 1px solid var(--hairline);
    justify-content: space-between;
}
.page-link {
    max-width: 48%;
    justify-content: flex-start;
}
.page-link.next { margin-left: auto; }

.toc-list {
    display: grid;
    gap: 4px;
}
.toc-list a {
    padding: 8px 10px;
    font-size: 12px;
}
.toc-list a[data-level="3"] {
    padding-left: 22px;
    font-size: 11px;
}

.section-toc {
    display: none;
    margin: 22px 0 32px;
    padding: 14px;
    border: 1px solid var(--hairline);
    border-radius: 16px;
    background: var(--panel-bg-soft);
}
.section-toc-title {
    margin: 0 0 10px;
    color: var(--sub-text);
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}
.section-toc-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.section-toc-list a {
    display: inline-flex;
    align-items: center;
    min-height: 38px;
    padding: 8px 11px;
    border-radius: 10px;
    color: var(--sub-text);
    background: var(--code-bg);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.25;
    transition: background 0.15s, color 0.15s, box-shadow 0.15s;
}
.section-toc-list a:hover {
    color: var(--ink);
    background: var(--item-hover);
}
.section-toc-list a.active {
    color: var(--ink);
    background: var(--item-hover-strong);
    box-shadow: inset 2px 0 0 var(--sub-text);
}

.docs-footer {
    width: 100%;
    max-width: 1540px;
    margin: 0 auto;
    padding: 0 22px 34px;
    color: var(--sub-text);
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.7;
    text-align: center;
    opacity: 0.72;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 2px solid var(--ink);
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: var(--ink);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    transform: translateY(20px) scale(0.8);
    transition: opacity 0.3s, transform 0.3s, background 0.2s;
    pointer-events: none;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

.back-to-top:hover {
    background: var(--ink);
    color: var(--btn-hover-text);
    transform: translateY(-2px) scale(1);
}

.back-to-top svg {
    width: 20px;
    height: 20px;
}

.doc-figure {
    margin: 26px 0;
    border: 1px solid var(--hairline);
    border-radius: 16px;
    background: var(--panel-bg-soft);
    overflow: hidden;
}
.doc-figure a {
    display: block;
    line-height: 0;
    position: relative;
    padding: 12px;
}
.doc-figure img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 10px;
    border: 1px solid var(--hairline);
    filter: saturate(0.92);
    transition: filter 0.2s ease, transform 0.2s ease, opacity 0.35s ease;
}
.doc-figure img[loading="lazy"] {
    opacity: 0;
}
.doc-figure img.image-loaded {
    opacity: 1;
}
.doc-figure a:hover img { filter: saturate(1); }
.doc-figure figcaption {
    margin: 0;
    padding: 4px 14px 13px;
    color: var(--sub-text);
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.5;
}
.doc-figure .figure-expand {
    position: absolute;
    top: 20px;
    right: 20px;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 5px 8px;
    border-radius: 8px;
    background: var(--panel-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    color: var(--ink);
    font-family: var(--font-mono);
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.04em;
    opacity: 0;
    transition: opacity 0.2s ease;
}
.doc-figure a:hover .figure-expand { opacity: 1; }
.figure-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    margin: 26px 0;
}
.figure-grid .doc-figure { margin: 0; }
.figure-grid .doc-figure a {
    padding: 12px 12px 0;
}
.figure-grid .doc-figure img {
    width: 100%;
    aspect-ratio: 16 / 10;
    height: auto;
    object-fit: cover;
    object-position: top center;
}
.figure-grid.xhs-preview-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: start;
    gap: 12px;
}
.xhs-preview-card {
    border-radius: 14px;
}
.figure-grid.xhs-preview-grid .xhs-preview-card a {
    padding: 10px 10px 0;
}
.figure-grid.xhs-preview-grid .xhs-preview-card img {
    aspect-ratio: 9 / 14;
    object-fit: contain;
    object-position: center;
    background: #fff;
}
.xhs-preview-card figcaption {
    padding: 10px 12px 13px;
}
.xhs-preview-card figcaption strong {
    display: block;
    color: var(--ink);
    font-family: var(--font-body);
    font-size: 13px;
    font-weight: 800;
    line-height: 1.35;
}
.xhs-preview-card figcaption span {
    display: block;
    margin-top: 4px;
    color: var(--sub-text);
    font-family: var(--font-mono);
    font-size: 11px;
    line-height: 1.45;
}
[data-theme="dark"] .figure-grid.xhs-preview-grid .xhs-preview-card img {
    background: #f7f7f7;
}
@media (max-width: 980px) {
    .figure-grid.xhs-preview-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}
@media (max-width: 600px) {
    .figure-grid { grid-template-columns: 1fr; }
    .figure-grid.xhs-preview-grid { grid-template-columns: 1fr; }
}

@media (max-width: 1280px) {
    .docs-layout { grid-template-columns: 220px minmax(0, 1fr); }
    .toc { display: none; }
    .section-toc {
        display: block;
        position: sticky;
        top: calc(var(--nav-height) + 10px);
        z-index: 35;
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
    }
    .doc-article h2,
    .doc-article h3 {
        scroll-margin-top: calc(var(--nav-height) + 138px);
    }
    .section-toc-list {
        flex-wrap: nowrap;
        overflow-x: auto;
        padding-bottom: 2px;
        scrollbar-width: none;
    }
    .section-toc-list::-webkit-scrollbar { display: none; }
    .section-toc-list a { flex: 0 0 auto; }
    .doc-paper { margin: 0; }
}

@media (max-width: 900px) {
    :root { --nav-height: 68px; }
    .topbar-inner { padding: 0 14px; }
    .breadcrumb { display: none; }
    .mobile-menu-btn { display: inline-flex; }
    .docs-layout {
        display: block;
        padding: 16px 14px 52px;
    }
    .sidebar {
        position: fixed;
        z-index: 80;
        top: var(--nav-height);
        left: 0;
        bottom: 0;
        width: min(330px, 86vw);
        max-height: none;
        padding: 14px;
        transform: translateX(-105%);
        transition: transform 0.24s ease;
        background: var(--panel-bg);
        border-right: 1px solid var(--hairline);
        backdrop-filter: blur(18px);
        -webkit-backdrop-filter: blur(18px);
    }
    body.nav-open .sidebar { transform: translateX(0); }
    body.nav-open::after {
        content: "";
        position: fixed;
        z-index: 70;
        inset: var(--nav-height) 0 0;
        background: rgba(0, 0, 0, 0.22);
    }
    .sidebar-card { background: transparent; border: none; padding: 0; }
    .section-toc { display: block; }
    .doc-paper { border-radius: 18px; box-shadow: 6px 6px 0 rgba(128, 128, 128, 0.12); }
    .doc-article { padding: 24px; }
    .featured-case,
    .case-hero { grid-template-columns: 1fr; }
    .featured-case-media,
    .case-hero-media { min-height: 260px; }
    .case-metrics,
    .case-hero-metrics { grid-template-columns: 1fr; }
    .meta-grid { grid-template-columns: 1fr; }
    .project-card { grid-template-columns: 1fr; }
    .project-card-arrow { display: none; }
    .page-link { max-width: none; width: 100%; }
    .page-link.next { margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}