:root {
      --bg: #0c0c0e;
      --bg-elevated: #141418;
      --bg-card: #18181d;
      --border: rgba(255, 255, 255, 0.08);
      --text: #f4f4f5;
      --text-muted: #a1a1aa;
      --accent: #c8ff00;
      --accent-dim: rgba(200, 255, 0, 0.15);
      --radius: 14px;
      --font: "DM Sans", system-ui, sans-serif;
      --max: 1180px;
      /* 首屏 hero：默认顶栏高度占位；运行时用 JS 写入实测 --hero-chrome */
      --hero-chrome: 80px;
    }

    [data-theme="light"] {
      --bg: #f4f4f5;
      --bg-elevated: #ffffff;
      --bg-card: #ffffff;
      --border: rgba(0, 0, 0, 0.08);
      --text: #18181b;
      --text-muted: #52525b;
      --accent: #84cc16;
      --accent-dim: rgba(132, 204, 22, 0.18);
    }

    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      font-family: var(--font);
      font-size: 16px;
      line-height: 1.6;
      color: var(--text);
      background: var(--bg);
      transition: background 0.25s ease, color 0.25s ease;
    }

    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; display: block; }

    .wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

    /* Header：顶栏通栏（不受 .wrap 最大宽度限制），底部分隔线滚动后再显示 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: color-mix(in srgb, var(--bg) 88%, transparent);
      -webkit-backdrop-filter: blur(6px);
      backdrop-filter: blur(6px);
      border-bottom: 1px solid transparent;
      transition: border-color 0.2s ease;
    }
    .site-header.is-scrolled {
      border-bottom-color: var(--border);
    }
    .nav-inner {
      width: 100%;
      max-width: none;
      margin: 0;
      box-sizing: border-box;
      padding-left: max(1.25rem, env(safe-area-inset-left, 0px));
      padding-right: max(1.25rem, env(safe-area-inset-right, 0px));
    }
    .nav {
      display: flex;
      align-items: center;
      gap: 20px;
      min-height: 72px;
    }
    /* 品牌：页脚与顶栏共用字号；顶栏内靠左并占满左侧空间 */
    .logo {
      font-weight: 700;
      font-size: 1.15rem;
      letter-spacing: -0.02em;
    }
    .nav .logo {
      margin-right: auto;
      flex-shrink: 0;
    }
    .logo span { color: var(--accent); }
    .nav-links {
      display: none;
      align-items: center;
      gap: 2rem;
      font-size: 1.125rem;
      font-weight: 700;
      color: var(--text-muted);
    }
    @media (min-width: 900px) {
      .nav-links {
        display: flex;
        gap: clamp(0.65rem, 1.2vw, 1.25rem);
        font-size: clamp(0.82rem, 0.95rem + 0.1vw, 1rem);
      }
    }
    .nav-links a:hover { color: var(--text); }
    .nav-actions {
      display: flex;
      align-items: center;
      flex-shrink: 0;
      gap: 12px;
    }
    .lang-switch {
      display: inline-flex;
      align-items: center;
      border-radius: 999px;
      border: 1px solid var(--border);
      background: var(--bg-elevated);
      overflow: hidden;
      flex-shrink: 0;
    }
    .lang-switch__btn {
      margin: 0;
      padding: 7px 11px;
      border: none;
      background: transparent;
      color: var(--text-muted);
      font: inherit;
      font-size: 0.78rem;
      font-weight: 700;
      letter-spacing: 0.04em;
      cursor: pointer;
      transition: background 0.15s, color 0.15s;
    }
    .lang-switch__btn:hover {
      color: var(--text);
    }
    .lang-switch__btn.is-active {
      background: color-mix(in srgb, var(--accent) 22%, transparent);
      color: var(--text);
    }
    [data-theme="light"] .lang-switch__btn.is-active {
      background: color-mix(in srgb, var(--accent) 18%, transparent);
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 18px;
      border-radius: 999px;
      font-weight: 600;
      font-size: 0.875rem;
      border: 1px solid var(--border);
      background: var(--bg-elevated);
      cursor: pointer;
      transition: transform 0.15s, border-color 0.15s, background 0.15s;
    }
    .btn:hover { transform: translateY(-1px); border-color: rgba(255,255,255,0.15); }
    .btn-primary {
      background: var(--text);
      color: var(--bg);
      border-color: transparent;
    }
    [data-theme="light"] .btn-primary {
      background: #18181b;
      color: #fafafa;
    }
    .theme-toggle {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      border: 1px solid var(--border);
      background: var(--bg-elevated);
      cursor: pointer;
      font-size: 1rem;
    }

    /* Hero：首屏铺满可视区域（扣除顶栏）；主内容块整体垂直居中 */
    .hero {
      position: relative;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: stretch;
      min-height: calc(100vh - var(--hero-chrome));
      min-height: calc(100svh - var(--hero-chrome));
      min-height: calc(100dvh - var(--hero-chrome));
      padding: clamp(2.25rem, 6.5vh, 4.75rem) 0 max(32px, env(safe-area-inset-bottom, 0px));
      padding-left: env(safe-area-inset-left, 0);
      padding-right: env(safe-area-inset-right, 0);
      text-align: center;
      background-color: var(--bg-elevated);
      background-image: radial-gradient(
        circle at center,
        rgba(0, 0, 0, 0.32) 1.05px,
        transparent 1.65px
      );
      background-size: 22px 22px;
      background-position: 0 0;
      border-bottom: 1px solid var(--border);
      box-sizing: border-box;
    }
    [data-theme="light"] .hero {
      background-image: radial-gradient(
        circle at center,
        rgba(0, 0, 0, 0.09) 1.05px,
        transparent 1.65px
      );
    }
    /* 首屏：深色主题 — 球在下、标题 difference 与球/底叠出反色；浅色主题见下方单独规则 */
    .hero .wrap.hero-composite {
      position: relative;
      width: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
    }
    .hero .wrap.hero-composite > h1.hero-title {
      position: relative;
      z-index: 2;
    }
    .hero .wrap.hero-composite > h1.hero-title.hero-title--invert {
      mix-blend-mode: difference;
    }
    .hero .wrap.hero-composite > p.lead,
    .hero .wrap.hero-composite > .hero-meta {
      position: relative;
      z-index: 3;
    }

    /* 浅色主题：光球坐标写在 #typewriterChars 上，与 radial-gradient 的「at」同属该块级盒（避免多行 inline 时 union rect 与绘制参照不一致） */
    [data-theme="light"] .hero-composite--light-orb .hero-title .typewriter-chars {
      display: block;
      width: 100%;
      max-width: 100%;
      text-align: center;
      box-sizing: border-box;
      background:
        radial-gradient(
          circle min(28vmin, 150px) at var(--orb-at-x, -99999px) var(--orb-at-y, -99999px),
          #ffffff 0%,
          #ffffff 98%,
          transparent 100%
        ),
        linear-gradient(var(--text), var(--text));
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
      -webkit-text-fill-color: transparent;
    }
    [data-theme="light"] .hero-composite--light-orb .hero-title .typewriter-chars .dot {
      -webkit-text-fill-color: var(--accent);
      color: var(--accent);
    }
    [data-theme="light"] .hero-composite--light-orb .hero-title .typewriter-chars .typewriter-caret {
      -webkit-text-fill-color: transparent;
      color: transparent;
    }
    .hero h1.hero-title {
      font-size: clamp(2.85rem, 8.5vw, 5.35rem);
      font-weight: 700;
      letter-spacing: -0.03em;
      line-height: 1.12;
      margin: 0 0 20px;
      max-width: 100%;
    }
    /* 文案与光标同一排版流：英文可换行，光标始终在整段末尾（最后一行） */
    .hero h1.hero-title .typewriter-row {
      display: inline-block;
      max-width: 100%;
      text-align: center;
      vertical-align: top;
    }
    .hero h1 .dot,
    .hero-title .dot {
      color: var(--accent);
    }
    .typewriter-chars {
      display: block;
      width: 100%;
      max-width: 100%;
      text-align: center;
      box-sizing: border-box;
    }
    .typewriter-caret {
      display: inline-block;
      width: 0.5em;
      min-width: 14px;
      max-width: 40px;
      height: 1em;
      vertical-align: text-bottom;
      margin-left: 0.08em;
      border-bottom: 4px solid var(--accent);
      box-sizing: border-box;
      opacity: 0;
      pointer-events: none;
    }
    .typewriter-caret.is-blinking {
      opacity: 1;
      animation: hero-underline-blink 1.05s ease-in-out infinite;
    }
    @keyframes hero-underline-blink {
      0%,
      40% {
        opacity: 1;
        border-color: var(--accent);
      }
      50%,
      90% {
        opacity: 0.12;
        border-color: transparent;
      }
      100% {
        opacity: 1;
        border-color: var(--accent);
      }
    }
    .hero p.lead {
      max-width: 560px;
      margin: 0 auto 32px;
      color: var(--text-muted);
      font-size: 1.05rem;
    }
    .hero-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
      font-size: 0.8rem;
      color: var(--text-muted);
    }
    .pill {
      padding: 6px 12px;
      border-radius: 999px;
      border: 1px solid var(--border);
      background: var(--bg-card);
    }

    /* 环形文案 + 播放钮：与上方文案区留白，随主块一起居中 */
    .hero-showreel {
      position: relative;
      z-index: 4;
      display: flex;
      justify-content: center;
      width: 100%;
      margin-top: clamp(35px, 4.5vh, 2.75rem);
    }
    .showreel-wheel {
      position: relative;
      /* 外框与按钮成比例：按钮直径 + 两侧字环留白，避免字圈远大于按钮 */
      width: min(calc(4.75rem * 1.5 + 5rem), 88vw);
      aspect-ratio: 1;
      max-width: min(280px, 92vw);
    }
    .showreel-wheel__svg {
      width: 100%;
      height: 100%;
      display: block;
      color: var(--text-muted);
      font-family: var(--font);
      transform-origin: 50% 50%;
      animation: showreel-text-orbit 36s linear infinite;
    }
    @keyframes showreel-text-orbit {
      to {
        transform: rotate(360deg);
      }
    }
    .showreel-wheel__text {
      font-size: 12px;
      font-weight: 600;
      letter-spacing: 0;
    }
    .showreel-play {
      position: absolute;
      left: 50%;
      top: 50%;
      transform: translate(-50%, -50%);
      width: calc(4.75rem * 1.5);
      height: calc(4.75rem * 1.5);
      border-radius: 50%;
      border: none;
      background: transparent;
      color: var(--text);
      cursor: pointer;
      display: grid;
      place-items: center;
      overflow: hidden;
      box-shadow: none;
      transition: transform 0.2s ease, background 0.2s ease;
    }
    [data-theme="light"] .showreel-play {
      background: transparent;
      box-shadow: none;
    }
    .showreel-play__preview {
      grid-area: 1 / 1;
      width: 100%;
      height: 100%;
      object-fit: cover;
      border-radius: 50%;
      opacity: 0;
      transition: opacity 0.28s ease;
      pointer-events: none;
      z-index: 0;
    }
    .showreel-play:hover .showreel-play__preview,
    .showreel-play:focus-visible .showreel-play__preview {
      opacity: 1;
    }
    .showreel-play:hover {
      transform: translate(-50%, -50%) scale(1.08);
    }
    .showreel-play:focus-visible {
      outline: none;
    }
    .showreel-play__icon {
      grid-area: 1 / 1;
      position: relative;
      z-index: 1;
      display: block;
      width: 0;
      height: 0;
      border-style: solid;
      border-width: 9px 0 9px 15px;
      border-color: transparent transparent transparent currentColor;
      margin-left: 4px;
      filter: drop-shadow(0 0 1px rgba(0, 0, 0, 0.65))
        drop-shadow(0 1px 2px rgba(0, 0, 0, 0.45));
    }
    [data-theme="light"] .showreel-play__icon {
      filter: drop-shadow(0 0 1px rgba(255, 255, 255, 0.9))
        drop-shadow(0 1px 2px rgba(0, 0, 0, 0.25));
    }

    .showreel-modal {
      padding: 0;
      border: none;
      max-width: min(920px, 96vw);
      width: 100%;
      background: transparent;
      margin: auto;
    }
    .showreel-modal::backdrop {
      background: rgba(0, 0, 0, 0.75);
      -webkit-backdrop-filter: blur(4px);
      backdrop-filter: blur(4px);
    }
    .showreel-modal__box {
      position: relative;
      padding: 0;
      border-radius: var(--radius);
      border: none;
      background: transparent;
      box-shadow: none;
      overflow: hidden;
    }
    .showreel-modal__video {
      display: block;
      width: 100%;
      max-height: min(76vh, 720px);
      border-radius: var(--radius);
      background: #000;
      cursor: pointer;
    }
    .showreel-modal__close {
      position: absolute;
      top: 10px;
      right: 10px;
      z-index: 2;
      width: 40px;
      height: 40px;
      border-radius: 50%;
      border: 1px solid rgba(255, 255, 255, 0.22);
      background: rgba(0, 0, 0, 0.55);
      color: #fff;
      font-size: 1.35rem;
      line-height: 1;
      cursor: pointer;
      display: grid;
      place-items: center;
      transition: background 0.2s, color 0.2s;
    }
    .showreel-modal__close:hover {
      background: rgba(0, 0, 0, 0.72);
      color: #fff;
    }
    @media (prefers-reduced-motion: reduce) {
      .showreel-wheel__svg {
        animation: none;
      }
      .showreel-play {
        transition: none;
      }
      .showreel-play__preview {
        transition: none;
      }
      .showreel-play:hover .showreel-play__preview,
      .showreel-play:focus-visible .showreel-play__preview {
        opacity: 0;
      }
    }
    .reveal-up {
      opacity: 0;
      transform: translate3d(0, 2rem, 0);
      transition:
        opacity 0.65s cubic-bezier(0.22, 1, 0.36, 1),
        transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
      pointer-events: none;
    }
    .reveal-up.is-reveal-visible {
      opacity: 1;
      transform: translate3d(0, 0, 0);
      pointer-events: auto;
    }
    @media (prefers-reduced-motion: reduce) {
      .reveal-up {
        opacity: 1;
        transform: none;
        transition: none;
        pointer-events: auto;
      }
    }

    /* Sections */
    section { padding: 88px 0; }
    section.alt { background: var(--bg-elevated); border-block: 1px solid var(--border); }

    /* 个人介绍：page6 式 sticky 长轨道 + clip-path 幕布与图层层叠，可随滚动顺滑反转 */
    section.section-intro {
      padding: 0;
      margin: 0;
      box-sizing: border-box;
      border-bottom: 1px solid var(--border);
      scroll-margin-top: 0.5rem;
    }
    .intro-scroll-track {
      position: relative;
      min-height: 220vh;
    }
    .intro-sticky {
      position: sticky;
      top: 0;
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
      padding: clamp(3rem, 6vw, 5.5rem) 0;
      box-sizing: border-box;
    }
    .intro-shell {
      width: min(100%, var(--max));
      margin-inline: auto;
      box-sizing: border-box;
      padding: 0 max(1.25rem, env(safe-area-inset-left, 0px)) 0 max(1.25rem, env(safe-area-inset-right, 0px));
      display: grid;
      grid-template-columns: 1fr;
      justify-items: center;
      gap: clamp(1.75rem, 4vw, 2.5rem);
      align-items: center;
    }
    .intro-stack {
      position: relative;
      margin: 0;
      width: min(100%, 26rem);
      aspect-ratio: 16 / 9;
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border);
      background: linear-gradient(160deg, rgba(255, 255, 255, 0.08), var(--bg-card));
      box-shadow: 0 18px 48px rgba(0, 0, 0, 0.22);
    }
    [data-theme="light"] .intro-stack {
      background: linear-gradient(160deg, #ececf2, var(--bg-card));
    }
    .intro-reveal {
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
      border-radius: inherit;
      overflow: hidden;
    }
    .intro-reveal--base {
      z-index: 1;
    }
    .intro-reveal#introPanel2 {
      z-index: 2;
    }
    .intro-reveal--base .intro-image-layer {
      clip-path: inset(0 0 0 0) !important;
      transition: none !important;
    }
    .intro-reveal--base .intro-color-layer {
      display: none;
    }
    .intro-color-layer,
    .intro-image-layer {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      -webkit-clip-path: inset(100% 0 0 0);
      clip-path: inset(100% 0 0 0);
    }
    .intro-color-layer {
      background: linear-gradient(
        168deg,
        #ffffff 0%,
        #f4f4f5 100%
      );
      transition: clip-path 0.6s cubic-bezier(0.77, 0, 0.175, 1) 0.2s,
        -webkit-clip-path 0.6s cubic-bezier(0.77, 0, 0.175, 1) 0.2s;
    }
    .intro-image-layer {
      background-size: cover;
      background-position: center;
      transition: clip-path 0.6s cubic-bezier(0.77, 0, 0.175, 1) 0s,
        -webkit-clip-path 0.6s cubic-bezier(0.77, 0, 0.175, 1) 0s;
    }
    .intro-image-layer--a {
      background-image: url("/images/个人图片1.jpg");
    }
    .intro-image-layer--b {
      background-image: url("/images/个人图片2.jpg");
    }
    .intro-reveal.is-active .intro-color-layer {
      -webkit-clip-path: inset(0 0 0 0);
      clip-path: inset(0 0 0 0);
      transition: clip-path 0.8s cubic-bezier(0.77, 0, 0.175, 1) 0s,
        -webkit-clip-path 0.8s cubic-bezier(0.77, 0, 0.175, 1) 0s;
    }
    .intro-reveal.is-active .intro-image-layer {
      -webkit-clip-path: inset(0 0 0 0);
      clip-path: inset(0 0 0 0);
      transition: clip-path 0.8s cubic-bezier(0.77, 0, 0.175, 1) 0.4s,
        -webkit-clip-path 0.8s cubic-bezier(0.77, 0, 0.175, 1) 0.4s;
    }
    @media (prefers-reduced-motion: reduce) {
      .intro-color-layer,
      .intro-image-layer {
        transition: none !important;
      }
      .intro-reveal#introPanel2:not(.is-active) .intro-image-layer,
      .intro-reveal#introPanel2:not(.is-active) .intro-color-layer {
        -webkit-clip-path: inset(100% 0 0 0) !important;
        clip-path: inset(100% 0 0 0) !important;
      }
      .intro-lead-stack > .intro-lead {
        transition: none;
      }
    }
    .intro-copy {
      min-width: 0;
      max-width: min(48rem, 100%);
    }
    .intro-lead-stack {
      display: grid;
      grid-template-columns: 1fr;
      grid-template-rows: 1fr;
    }
    .intro-lead-stack > .intro-lead {
      grid-area: 1 / 1;
      align-self: start;
      transition:
        opacity 0.55s cubic-bezier(0.22, 1, 0.36, 1),
        transform 0.55s cubic-bezier(0.22, 1, 0.36, 1);
    }
    .intro-lead--b {
      opacity: 0;
      transform: translateY(0.45rem);
      pointer-events: none;
    }
    #introCopy.is-phase-b .intro-lead--a {
      opacity: 0;
      transform: translateY(-0.35rem);
      pointer-events: none;
    }
    #introCopy.is-phase-b .intro-lead--b {
      opacity: 1;
      transform: translateY(0);
      pointer-events: auto;
    }
    @media (max-width: 767px) {
      .intro-copy {
        text-align: center;
      }
    }
    .intro-lead {
      margin: 0;
      max-width: min(72ch, 100%);
      margin-inline: auto;
      color: var(--text-muted);
      font-size: clamp(1.2rem, 2.45vw, 1.55rem);
      font-weight: 600;
      line-height: 1.65;
      letter-spacing: 0.01em;
    }
    .intro-highlights {
      margin-top: 0.5rem;
    }
    @media (min-width: 768px) {
      .intro-shell {
        grid-template-columns: minmax(0, 1fr) auto;
        justify-items: stretch;
        align-items: center;
        column-gap: clamp(1.75rem, 4vw, 3rem);
      }
      .intro-copy {
        text-align: left;
        justify-self: start;
        max-width: min(52rem, 100%);
      }
      .intro-stack {
        justify-self: end;
        width: min(36rem, 46vw);
      }
    }
    .section-head {
      display: flex;
      flex-wrap: wrap;
      align-items: flex-end;
      justify-content: space-between;
      gap: 20px;
      margin-bottom: 48px;
    }
    .section-head h2 {
      margin: 0;
      font-size: clamp(1.75rem, 3vw, 2.25rem);
      letter-spacing: -0.02em;
    }
    .eyebrow {
      font-size: 0.75rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.12em;
      color: var(--accent);
      margin: 0 0 8px;
    }
    .link-more {
      font-weight: 600;
      font-size: 0.9rem;
      color: var(--text-muted);
      border-bottom: 2px solid var(--accent);
      padding-bottom: 2px;
    }
    .link-more:hover { color: var(--text); }

    .grid-3 {
      display: grid;
      gap: 20px;
      grid-template-columns: 1fr;
    }
    @media (min-width: 640px) { .grid-3 { grid-template-columns: repeat(2, 1fr); } }
    @media (min-width: 960px) { .grid-3 { grid-template-columns: repeat(3, 1fr); } }

    /* 技能区容器加宽约一倍（相对原 42rem 栅格） */
    #work .wrap.wrap--skills-wide {
      max-width: min(100%, 84rem);
    }

    /* IT 技能：单列多行 + 3D 倾斜 + 点击翻转 */
    .skills-grid--stack {
      display: grid;
      grid-template-columns: 1fr;
      gap: 1.5rem;
      width: 100%;
      max-width: none;
      margin-inline: auto;
    }
    .skill-flip-root {
      perspective: 1100px;
      outline: none;
      cursor: pointer;
      border-radius: var(--radius);
    }
    .skill-flip-root:focus-visible {
      box-shadow: 0 0 0 3px var(--accent-dim);
    }
    .skill-flip-tilt {
      transform-style: preserve-3d;
      transition: transform 0.12s ease-out;
      will-change: transform;
      border-radius: var(--radius);
    }
    @media (prefers-reduced-motion: reduce) {
      .skill-flip-tilt {
        transition: none;
      }
      .skill-flip-inner {
        transition-duration: 0.15s;
      }
    }
    .skill-flip-inner {
      position: relative;
      transform-style: preserve-3d;
      transition: transform 0.65s cubic-bezier(0.4, 0, 0.2, 1);
      min-height: 11.5rem;
    }
    .skill-flip-root.is-flipped .skill-flip-inner {
      transform: rotateY(180deg);
    }
    .skill-face {
      transform-style: preserve-3d;
      backface-visibility: hidden;
      -webkit-backface-visibility: hidden;
      box-sizing: border-box;
    }
    /* 子元素默认不继承 backface-visibility，需单独声明以免翻转时正面字透到背面 */
    .skill-face--front,
    .skill-face--front * {
      backface-visibility: hidden;
      -webkit-backface-visibility: hidden;
    }
    .skill-face--back,
    .skill-face--back * {
      backface-visibility: hidden;
      -webkit-backface-visibility: hidden;
    }
    .skill-face--front {
      position: relative;
      z-index: 2;
      overflow: hidden;
      background: var(--bg-card);
      transform: rotateY(0deg) translateZ(2px);
    }
    .skill-face--back {
      position: absolute;
      inset: 0;
      z-index: 1;
      overflow: auto;
      justify-content: center;
      align-items: center;
      text-align: center;
      border-color: rgba(255, 255, 255, 0.1);
      transform: rotateY(180deg) translateZ(2px);
    }
    .skill-back-panel {
      width: 100%;
      padding: 0.25rem 0.25rem 0;
      box-sizing: border-box;
    }
    .skill-back-kicker {
      margin: 0 0 1rem;
      font-size: 0.72rem;
      font-weight: 700;
      letter-spacing: 0.16em;
      text-transform: uppercase;
      color: var(--accent);
    }
    .skill-back-tags {
      list-style: none;
      margin: 0;
      padding: 0;
      display: flex;
      flex-wrap: wrap;
      gap: 0.5rem 0.55rem;
      justify-content: center;
      align-items: center;
    }
    .skill-back-tags li {
      margin: 0;
      font-size: 0.82rem;
      font-weight: 600;
      line-height: 1.2;
      padding: 0.4rem 0.85rem;
      border-radius: 999px;
      border: 1px solid var(--border);
      color: var(--text);
      background: color-mix(in srgb, var(--bg-card) 55%, transparent);
    }
    [data-theme="light"] .skill-back-tags li {
      background: rgba(255, 255, 255, 0.55);
    }
    .skill-face.card {
      height: 100%;
      min-height: 11.5rem;
      display: flex;
      flex-direction: column;
    }
    .skill-face--front.skill-card {
      flex-direction: row;
      align-items: center;
      justify-content: space-between;
      gap: 1rem 1.25rem;
    }
    .skill-card-main {
      flex: 1;
      min-width: 0;
    }
    .skill-mastery {
      flex-shrink: 0;
      display: flex;
      flex-direction: column;
      align-items: flex-end;
      justify-content: center;
      gap: 0.45rem;
      padding-top: 0;
      padding-right: 56px;
      text-align: right;
    }
    .skill-mastery-label {
      font-size: 0.82rem;
      font-weight: 700;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: var(--text-muted);
    }
    .skill-mastery-row {
      font-variant-numeric: tabular-nums;
      line-height: 1;
      display: flex;
      align-items: baseline;
      flex-wrap: nowrap;
    }
    .skill-mastery-value {
      font-size: clamp(1.65rem, 3.8vw, 2.15rem);
      font-weight: 700;
      letter-spacing: -0.03em;
      color: var(--text);
    }
    .skill-mastery-unit {
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-muted);
      margin-left: 0.08em;
    }
    .skill-card .skill-meta {
      margin: 0 0 0.5rem;
      font-size: 0.7rem;
      font-weight: 700;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      color: var(--accent);
    }
    .skill-card h3 {
      margin: 0 0 0.65rem;
      font-size: 1.15rem;
      letter-spacing: -0.02em;
    }
    .skill-card p {
      margin: 0;
      font-size: 0.92rem;
      line-height: 1.58;
    }

    .card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 28px;
      transition: border-color 0.2s, box-shadow 0.2s;
    }
    .card:hover {
      border-color: rgba(255,255,255,0.12);
      box-shadow: 0 20px 50px rgba(0,0,0,0.25);
    }
    [data-theme="light"] .card:hover {
      box-shadow: 0 16px 40px rgba(0,0,0,0.08);
    }
    .card h3 { margin: 0 0 10px; font-size: 1.1rem; }
    .card p { margin: 0; color: var(--text-muted); font-size: 0.95rem; }

    /* 技能卡背面：渐变背景（覆盖通用 .card 底色） */
    .card.skill-face--back {
      background:
        radial-gradient(ellipse 120% 80% at 20% 0%, var(--accent-dim), transparent 55%),
        radial-gradient(ellipse 90% 70% at 100% 100%, rgba(120, 120, 200, 0.12), transparent 50%),
        linear-gradient(165deg, #12121a 0%, var(--bg-elevated) 55%, #0e0e14 100%);
      border-color: rgba(255, 255, 255, 0.1);
    }
    [data-theme="light"] .card.skill-face--back {
      background:
        radial-gradient(ellipse 120% 80% at 20% 0%, var(--accent-dim), transparent 55%),
        radial-gradient(ellipse 90% 70% at 100% 100%, rgba(80, 80, 160, 0.08), transparent 50%),
        linear-gradient(165deg, #fafafa 0%, #f0f0f5 50%, #ececf2 100%);
      border-color: rgba(0, 0, 0, 0.08);
    }

    .list-check {
      list-style: none;
      padding: 0;
      margin: 32px 0 0;
    }
    .list-check li {
      position: relative;
      padding-left: 28px;
      margin-bottom: 14px;
      color: var(--text-muted);
    }
    .list-check li::before {
      content: "";
      position: absolute;
      left: 0;
      top: 0.45em;
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: var(--accent);
    }

    /* Cases */
    .cases {
      display: grid;
      gap: 20px;
      grid-template-columns: 1fr;
    }
    @media (min-width: 720px) {
      .cases { grid-template-columns: repeat(2, 1fr); }
    }
    .case {
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border);
      background: var(--bg-card);
    }
    /* 案例头图：白幕 + clip-path；每张卡片进入视区时单独加 .is-case-revealed（见 main.js） */
    .case-visual {
      position: relative;
      aspect-ratio: 16 / 10;
      overflow: hidden;
      border-bottom: 1px solid var(--border);
      background: linear-gradient(160deg, rgba(255, 255, 255, 0.08), var(--bg-card));
      box-shadow:
        inset 0 0 0 1px rgba(255, 255, 255, 0.04),
        0 14px 36px rgba(0, 0, 0, 0.18);
    }
    [data-theme="light"] .case-visual {
      background: linear-gradient(160deg, #ececf2, var(--bg-card));
      box-shadow:
        inset 0 0 0 1px rgba(0, 0, 0, 0.05),
        0 14px 36px rgba(0, 0, 0, 0.1);
    }
    .case-cover--top {
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
      overflow: hidden;
    }
    .case-cover__tint,
    .case-cover__img {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      -webkit-clip-path: inset(100% 0 0 0);
      clip-path: inset(100% 0 0 0);
    }
    .case-cover__img {
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
    }
    .case-cover__tint {
      background: linear-gradient(
        168deg,
        #ffffff 0%,
        #f4f4f5 100%
      );
      transition: clip-path 0.6s cubic-bezier(0.77, 0, 0.175, 1) 0.2s,
        -webkit-clip-path 0.6s cubic-bezier(0.77, 0, 0.175, 1) 0.2s;
    }
    .case-cover--top .case-cover__img {
      transition: clip-path 0.6s cubic-bezier(0.77, 0, 0.175, 1) 0s,
        -webkit-clip-path 0.6s cubic-bezier(0.77, 0, 0.175, 1) 0s;
    }
    #cases .case.is-case-revealed .case-cover--top .case-cover__tint {
      -webkit-clip-path: inset(0 0 0 0);
      clip-path: inset(0 0 0 0);
      transition: clip-path 0.8s cubic-bezier(0.77, 0, 0.175, 1) 0s,
        -webkit-clip-path 0.8s cubic-bezier(0.77, 0, 0.175, 1) 0s;
    }
    #cases .case.is-case-revealed .case-cover--top .case-cover__img {
      -webkit-clip-path: inset(0 0 0 0);
      clip-path: inset(0 0 0 0);
      transition: clip-path 0.8s cubic-bezier(0.77, 0, 0.175, 1) 0.4s,
        -webkit-clip-path 0.8s cubic-bezier(0.77, 0, 0.175, 1) 0.4s;
    }
    /* 同一会话内已展示过：直接定格，不再播放过渡 */
    #cases .case.is-case-revealed--instant .case-cover__tint,
    #cases .case.is-case-revealed--instant .case-cover__img {
      transition: none !important;
      -webkit-clip-path: inset(0 0 0 0) !important;
      clip-path: inset(0 0 0 0) !important;
    }
    @media (prefers-reduced-motion: reduce) {
      .case-cover__tint,
      .case-cover__img {
        transition: none !important;
        -webkit-clip-path: inset(0 0 0 0) !important;
        clip-path: inset(0 0 0 0) !important;
      }
    }
    .case-body { padding: 22px 24px 26px; }
    .case-tags { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent); margin-bottom: 8px; }
    .case h3 { margin: 0 0 8px; font-size: 1.05rem; }

    /* 常见问题：与「客户反馈」对调背景（不再使用 section.alt） */
    section#pricing {
      background: var(--bg);
      border-bottom: 1px solid var(--border);
    }

    /* 信任与反馈：合规标签 + 评价 + 数据（同一 section） */
    section.section-trust .compliance {
      padding: 2.25rem 0 0;
      margin: 2.75rem 0 0;
      background: transparent;
      border: none;
      border-top: 1px solid var(--border);
    }
    section.section-trust .compliance h3 {
      margin: 0 0 1.25rem;
      font-size: 1rem;
      text-align: center;
      color: var(--text-muted);
      font-weight: 500;
    }
    .badges {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      max-width: 900px;
      margin: 0 auto;
    }
    .badges span {
      font-size: 0.78rem;
      padding: 8px 14px;
      border-radius: 8px;
      border: 1px solid var(--border);
      color: var(--text-muted);
    }

    /* 客户反馈：宽屏左右两列，窄屏上下堆叠 */
    .quote-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 1.25rem;
      width: 100%;
      max-width: min(72rem, 100%);
      margin-inline: auto;
      align-items: stretch;
    }
    @media (min-width: 640px) {
      .quote-grid {
        grid-template-columns: 1fr 1fr;
        gap: 1.5rem;
      }
    }
    .quote-grid .quote-card {
      width: 100%;
      max-width: none;
      margin: 0;
      min-height: clamp(10.5rem, 28vw, 12.5rem);
      padding: clamp(1.75rem, 4vw, 2.35rem) clamp(1.5rem, 3vw, 2.25rem);
      border-radius: var(--radius);
      border: 1px solid var(--border);
      background: var(--bg-card);
      text-align: left;
      box-sizing: border-box;
      display: flex;
      flex-direction: column;
      justify-content: center;
      gap: 0.5rem;
    }
    @media (min-width: 640px) {
      .quote-grid .quote-card {
        min-height: clamp(11.5rem, 22vw, 14rem);
      }
    }
    .quote-grid .quote-card p {
      margin: 0;
      font-size: clamp(0.8125rem, 1.15vw, 0.9375rem);
      font-weight: 500;
      color: var(--text-muted);
      line-height: 1.65;
    }

    .stats {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-top: 48px;
      text-align: center;
    }
    @media (min-width: 640px) { .stats { grid-template-columns: repeat(4, 1fr); } }
    .stat strong {
      display: block;
      font-size: 1.75rem;
      font-weight: 700;
      letter-spacing: -0.02em;
    }
    .stat .stat-value,
    .stat .stat-suffix {
      font-size: inherit;
      font-weight: inherit;
      color: inherit;
    }
    .stat .stat-label {
      display: block;
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* FAQ */
    details {
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 0 20px;
      margin-bottom: 12px;
      background: var(--bg-card);
    }
    details summary {
      cursor: pointer;
      font-weight: 600;
      padding: 18px 0;
      list-style: none;
    }
    details summary::-webkit-details-marker { display: none; }
    details[open] summary { border-bottom: 1px solid var(--border); margin-bottom: 12px; }
    details p { margin: 0 0 18px; color: var(--text-muted); font-size: 0.95rem; }

    /* 联系我：快速联系表单 */
    .section-contact .contact-card {
      max-width: 680px;
      margin: 0 auto;
      padding: clamp(28px, 4vw, 44px);
    }
    .contact-form {
      display: flex;
      flex-direction: column;
      gap: 1.2rem;
    }
    .contact-field label {
      display: block;
      font-size: 0.875rem;
      font-weight: 600;
      margin-bottom: 0.4rem;
      color: var(--text-muted);
    }
    .contact-field input,
    .contact-field textarea {
      width: 100%;
      box-sizing: border-box;
      padding: 12px 14px;
      border-radius: 12px;
      border: 1px solid var(--border);
      background: var(--bg-elevated);
      color: var(--text);
      font: inherit;
      line-height: 1.45;
    }
    .contact-field input::placeholder,
    .contact-field textarea::placeholder {
      color: color-mix(in srgb, var(--text-muted) 72%, transparent);
    }
    .contact-field textarea {
      resize: vertical;
      min-height: 132px;
    }
    .contact-field input:focus-visible,
    .contact-field textarea:focus-visible {
      outline: 2px solid color-mix(in srgb, var(--accent) 65%, transparent);
      outline-offset: 1px;
    }
    .contact-form .btn-primary {
      margin-top: 0.35rem;
      width: 100%;
      padding: 12px 22px;
      font-size: 0.95rem;
    }
    @media (min-width: 560px) {
      .contact-form .btn-primary {
        width: auto;
        min-width: 180px;
        align-self: flex-start;
      }
    }

    /* Footer */
    footer {
      padding: 64px 0 32px;
      border-top: 1px solid var(--border);
      background: var(--bg-elevated);
    }
    .foot-grid {
      display: grid;
      gap: 40px;
      grid-template-columns: 1fr;
      margin-bottom: 48px;
    }
    @media (min-width: 720px) {
      .foot-grid { grid-template-columns: 1.2fr 1fr 1fr; }
    }
    footer h4 { margin: 0 0 16px; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); }
    footer ul { list-style: none; padding: 0; margin: 0; }
    footer li { margin-bottom: 10px; font-size: 0.9rem; color: var(--text-muted); }
    footer li a:hover { color: var(--text); }
    .foot-bottom {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      justify-content: space-between;
      align-items: center;
      padding-top: 24px;
      border-top: 1px solid var(--border);
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    .banner-note {
      text-align: center;
      font-size: 0.75rem;
      color: var(--text-muted);
      padding: 10px 16px;
      background: var(--accent-dim);
      border-bottom: 1px solid var(--border);
    }

    /* Hero 内：跟随球在标题下层，纯色；反色由标题 h1 的 mix-blend-mode 实现 */
    .cursor-follow {
      position: absolute;
      inset: 0;
      pointer-events: none;
      z-index: 1;
    }
    .cursor-follow-disk {
      position: absolute;
      left: var(--fx);
      top: var(--fy);
      width: min(56vmin, 300px);
      height: min(56vmin, 300px);
      transform: translate(-50%, -50%);
      border-radius: 50%;
      background: #fff;
      visibility: hidden;
      pointer-events: none;
    }
    .cursor-follow.is-active .cursor-follow-disk {
      visibility: visible;
    }
    [data-theme="light"] .cursor-follow-disk {
      background: #000;
    }

    /* 全站：首屏外区域的小圆点跟随（fixed，不挡交互） */
    .cursor-follow-global {
      position: fixed;
      inset: 0;
      pointer-events: none;
      z-index: 9997;
      opacity: 0;
      transition: opacity 0.45s ease;
      --gfx: -9999px;
      --gfy: -9999px;
    }
    .cursor-follow-global.is-active {
      opacity: 1;
    }
    .cursor-follow-global::before {
      content: "";
      position: absolute;
      left: var(--gfx);
      top: var(--gfy);
      width: 28px;
      height: 28px;
      box-sizing: border-box;
      transform: translate(-50%, -50%);
      border-radius: 50%;
      background: rgba(0, 0, 0, 0.1);
      border: 0px solid #000;
    }
    @media (prefers-reduced-motion: reduce) {
      .cursor-follow,
      .cursor-follow-global {
        display: none !important;
      }
    }