*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

    :root {
      --black: #0a0a0a;
      --white: #f0ede8;
      --accent: #c8a96e;
      --gray: #888;
      --light-gray: #1a1a1a;
      --font-body: 'Inter', system-ui, sans-serif;
      --font-display: 'Barlow Condensed', system-ui, sans-serif;
    }

    html[lang="zh-CN"] {
      --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-display: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }

    html[lang="zh-CN"] .hero-headline {
      text-transform: none;
      letter-spacing: 0.04em;
      line-height: 1.05;
    }

    html[lang="zh-CN"] .nav-logo,
    html[lang="zh-CN"] .section-title,
    html[lang="zh-CN"] .cta-title,
    html[lang="zh-CN"] .spec-value,
    html[lang="zh-CN"] .hero-sub p,
    html[lang="zh-CN"] nav a,
    html[lang="zh-CN"] .settings-header h3 {
      text-transform: none;
    }

    html { scroll-behavior: auto; }

    body {
      background: var(--black);
      color: var(--white);
      font-family: var(--font-body);
      overflow-x: hidden;
    }

    /* NAV */
    nav {
      position: fixed;
      top: 0; left: 0; right: 0;
      z-index: 100;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 24px 48px;
      mix-blend-mode: normal;
    }

    nav::after {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0;
      height: 180px;
      background: linear-gradient(to bottom, rgba(10,10,10,1) 10%, rgba(10,10,10,0.8) 50%, transparent 100%);
      z-index: -1;
      pointer-events: none;
    }

    .nav-logo {
      font-family: var(--font-display);
      font-weight: 900;
      font-size: 13px;
      letter-spacing: 0.2em;
      text-transform: uppercase;
      color: var(--white);
      opacity: 0.9;
    }

    .nav-right {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-right a {
      font-size: 11px;
      letter-spacing: 0.15em;
      text-transform: uppercase;
      color: var(--white);
      text-decoration: none;
      opacity: 0.6;
      transition: opacity 0.3s;
    }

    .nav-right a:hover { opacity: 1; }
    .nav-right a.nav-active {
      opacity: 1;
      color: var(--accent);
    }

    .lang-switch {
      display: flex;
      align-items: center;
      gap: 2px;
      border: 1px solid rgba(240, 237, 232, 0.15);
      border-radius: 2px;
      overflow: hidden;
      flex-shrink: 0;
    }

    .lang-btn {
      font-family: var(--font-body);
      font-size: 10px;
      font-weight: 500;
      letter-spacing: 0.08em;
      padding: 6px 10px;
      background: transparent;
      border: none;
      color: rgba(240, 237, 232, 0.45);
      cursor: pointer;
      transition: background 0.2s, color 0.2s;
      line-height: 1;
    }

    .lang-btn:hover {
      color: var(--white);
      background: rgba(240, 237, 232, 0.06);
    }

    .lang-btn.active {
      background: var(--accent);
      color: var(--black);
    }

    /* HAMBURGER */
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      padding: 4px;
      background: none;
      border: none;
      z-index: 200;
    }

    .hamburger span {
      display: block;
      width: 22px;
      height: 1.5px;
      background: var(--white);
      transition: transform 0.35s cubic-bezier(0.16,1,0.3,1), opacity 0.25s;
      transform-origin: center;
    }

    .hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
    .hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
    .hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

    @media (max-width: 768px) {
      nav { padding: 20px 24px; }

      .hamburger { display: flex; }

      /* HERO MOBILE */
      #section-hero {
        padding: 0 24px 60px;
        align-items: flex-start;
        min-height: 100svh;
        flex-direction: column;
        justify-content: flex-end;
      }

      .hero-headline {
        font-size: clamp(100px, 34vw, 160px);
        text-align: left;
      }

      .hero-sub {
        display: none !important;
      }

      .nav-right {
        position: fixed;
        top: 0; right: 0;
        height: 100vh;
        width: 260px;
        background: rgba(10,10,10,0.97);
        border-left: 1px solid rgba(240,237,232,0.08);
        flex-direction: column;
        justify-content: center;
        align-items: flex-start;
        padding: 80px 40px 40px;
        gap: 28px;
        transform: translateX(100%);
        transition: transform 0.4s cubic-bezier(0.16,1,0.3,1);
        z-index: 150;
        pointer-events: none;
      }

      .nav-right.mobile-open {
        transform: translateX(0);
        pointer-events: all;
      }

      .nav-right a {
        font-size: 13px;
        letter-spacing: 0.18em;
        opacity: 0.7;
      }

      .nav-cta {
        margin-top: 12px;
        padding: 10px 24px;
      }

      .lang-switch {
        margin-top: 8px;
        align-self: flex-start;
      }

    }

    .nav-cta {
      font-size: 11px;
      letter-spacing: 0.15em;
      text-transform: uppercase;
      border: 1px solid rgba(240,237,232,0.3);
      padding: 8px 20px;
      color: var(--white) !important;
      opacity: 1 !important;
      transition: background 0.3s, border-color 0.3s !important;
    }
    .nav-cta.nav-active {
      border-color: var(--accent) !important;
      color: var(--accent) !important;
    }

    .nav-cta:hover {
      background: var(--white);
      color: var(--black) !important;
    }

    /* CANVAS STICKY */
    #canvas-wrapper {
      position: fixed;
      top: 0; left: 0;
      width: 100%; height: 100vh;
      z-index: 1;
      pointer-events: none;
    }

    #vignette-overlay {
      position: fixed;
      top: 0; left: 0;
      width: 100%; height: 100%;
      z-index: 2;
      pointer-events: none;
      background: radial-gradient(
        ellipse 75% 65% at 50% 60%,
        transparent 40%,
        rgba(10,10,10,0.35) 62%,
        rgba(10,10,10,0.75) 82%,
        #0a0a0a 100%
      );
    }

    #three-canvas {
      width: 100%; height: 100%;
      display: block;
    }

    /* SCROLL CONTAINER */
    #scroll-container {
      position: relative;
      z-index: 10;
      pointer-events: none;
    }

    /* SECTIONS */
    .section {
      min-height: 110vh;
      display: flex;
      align-items: flex-end;
      padding: 0 48px 80px;
      pointer-events: none;
      position: relative;
    }

    /* HERO */
    #section-hero {
      align-items: flex-end;
      min-height: 100vh;
    }

    #section-cta {
      min-height: 100vh;
    }

    .hero-headline {
      font-family: var(--font-display);
      font-weight: 900;
      font-size: clamp(64px, 13vw, 200px);
      line-height: 0.88;
      letter-spacing: -0.02em;
      text-transform: uppercase;
      color: var(--white);
      mix-blend-mode: normal;
      user-select: none;
    }

    .hero-headline .line { display: block; }
    .hero-headline .stroke {
      -webkit-text-stroke: 1px var(--white);
      color: transparent;
    }

    .hero-sub {
      position: absolute;
      right: 48px;
      bottom: 80px;
      text-align: right;
      display: flex;
      flex-direction: column;
      align-items: flex-end;
      gap: 0;
    }

    .hero-sub p {
      font-size: 11px;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: var(--gray);
      line-height: 2;
    }

    .hero-sub .year {
      font-family: var(--font-display);
      font-size: 11px;
      letter-spacing: 0.2em;
      color: var(--accent);
    }

    .scroll-indicator {
      display: flex;
      flex-direction: row;
      align-items: center;
      gap: 10px;
      pointer-events: none;
      margin-top: 20px;
    }

    .scroll-indicator span {
      font-size: 10px;
      letter-spacing: 0.2em;
      text-transform: uppercase;
      color: var(--gray);
    }

    .scroll-line {
      width: 40px;
      height: 1px;
      background: linear-gradient(to left, var(--accent), transparent);
      animation: scrollPulse 2s ease-in-out infinite;
    }

    @keyframes scrollPulse {
      0%, 100% { opacity: 0.4; transform: scaleX(1); }
      50% { opacity: 1; transform: scaleX(1.2); }
    }

    /* LOAD-IN ANIMATIONS */
    @keyframes fadeUp {
      from { opacity: 0; transform: translateY(28px); }
      to   { opacity: 1; transform: translateY(0); }
    }

    @keyframes fadeDown {
      from { opacity: 0; transform: translateY(-16px); }
      to   { opacity: 1; transform: translateY(0); }
    }

    @keyframes fadeIn {
      from { opacity: 0; }
      to   { opacity: 1; }
    }

    @keyframes slideInRight {
      from { opacity: 0; transform: translateX(24px); }
      to   { opacity: 1; transform: translateX(0); }
    }

    @keyframes revealLine {
      from { clip-path: inset(0 100% 0 0); }
      to   { clip-path: inset(0 0% 0 0); }
    }

    /* NAV */
    nav .nav-logo {
      animation: fadeDown 0.7s cubic-bezier(0.16,1,0.3,1) 0.2s both;
    }

    @media (min-width: 769px) {
      nav .nav-right {
        animation: fadeDown 0.7s cubic-bezier(0.16,1,0.3,1) 0.35s both;
      }
    }

    /* HERO TEXT */
    .hero-headline .line:nth-child(1) {
      display: block;
      animation: fadeUp 0.9s cubic-bezier(0.16,1,0.3,1) 0.55s both;
    }

    .hero-headline .line:nth-child(2) {
      display: block;
      animation: fadeUp 0.9s cubic-bezier(0.16,1,0.3,1) 0.72s both;
    }

    .hero-sub {
      animation: slideInRight 0.8s cubic-bezier(0.16,1,0.3,1) 0.95s both;
    }

    .scroll-indicator {
      animation: fadeIn 0.8s ease 1.3s both;
    }

    /* Respect reduced-motion */
    @media (prefers-reduced-motion: reduce) {
      nav .nav-logo,
      nav .nav-right,
      .hero-headline .line,
      .hero-sub,
      .scroll-indicator {
        animation: none;
      }
    }

    /* OVERVIEW SECTION */
    #section-overview {
      align-items: center;
    }

    .section-tag {
      font-size: 10px;
      letter-spacing: 0.25em;
      text-transform: uppercase;
      color: var(--accent);
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .section-tag::before {
      content: '';
      width: 24px;
      height: 1px;
      background: var(--accent);
    }

    .overview-content { max-width: 480px; }

    .section-title {
      font-family: var(--font-display);
      font-size: clamp(40px, 6vw, 80px);
      font-weight: 800;
      text-transform: uppercase;
      line-height: 0.92;
      letter-spacing: -0.01em;
      margin-bottom: 32px;
    }

    .section-body {
      font-size: 14px;
      line-height: 1.8;
      color: rgba(240,237,232,0.55);
      max-width: 380px;
      margin-bottom: 40px;
    }

    .stat-row {
      display: flex;
      gap: 40px;
      margin-top: 40px;
      padding-top: 40px;
      border-top: 1px solid rgba(240,237,232,0.08);
    }

    .stat { display: flex; flex-direction: column; gap: 4px; }

    .stat-val {
      font-family: var(--font-display);
      font-size: 36px;
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--white);
    }

    .stat-label {
      font-size: 10px;
      letter-spacing: 0.15em;
      text-transform: uppercase;
      color: var(--gray);
    }

    /* SPECS SECTION */
    #section-specs {
      align-items: center;
      justify-content: flex-end;
    }

    .specs-content { max-width: 500px; text-align: right; }

    .specs-list { list-style: none; margin-top: 32px; }

    .specs-list li {
      display: flex;
      justify-content: space-between;
      align-items: baseline;
      padding: 16px 0;
      border-bottom: 1px solid rgba(240,237,232,0.06);
      gap: 40px;
    }

    .spec-name {
      font-size: 11px;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: var(--gray);
    }

    .spec-val {
      font-family: var(--font-display);
      font-size: 22px;
      font-weight: 700;
      letter-spacing: -0.01em;
      color: var(--white);
    }

    /* FEATURES SECTION */
    #section-features {
      align-items: flex-end;
      min-height: 100vh;
    }

    .features-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2px;
      max-width: 520px;
      margin-top: 40px;
    }

    .feature-item {
      background: rgba(6,6,6,0.72);
      border: 1px solid rgba(240,237,232,0.06);
      padding: 28px 24px;
      backdrop-filter: blur(6px);
      -webkit-backdrop-filter: blur(6px);
    }

    .feature-num {
      font-family: var(--font-display);
      font-size: 11px;
      font-weight: 700;
      letter-spacing: 0.2em;
      color: var(--accent);
      margin-bottom: 12px;
    }

    .feature-name {
      font-family: var(--font-display);
      font-size: 18px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.02em;
      margin-bottom: 8px;
    }

    .feature-desc {
      font-size: 11px;
      line-height: 1.7;
      color: rgba(240,237,232,0.45);
    }

    /* TESTIMONIAL SECTION */
    #section-quote {
      align-items: center;
      justify-content: center;
      text-align: center;
      flex-direction: column;
    }

    .quote-mark {
      font-family: var(--font-display);
      font-size: 120px;
      line-height: 0.6;
      color: var(--accent);
      opacity: 0.3;
      margin-bottom: 16px;
    }

    .quote-text {
      font-family: var(--font-display);
      font-size: clamp(28px, 4vw, 52px);
      font-weight: 700;
      text-transform: uppercase;
      line-height: 1.1;
      letter-spacing: -0.01em;
      max-width: 800px;
      margin: 0 auto 32px;
    }

    .quote-attr {
      font-size: 11px;
      letter-spacing: 0.2em;
      text-transform: uppercase;
      color: var(--gray);
    }

    .quote-attr strong {
      color: var(--accent);
      font-weight: 500;
    }

    /* CTA SECTION */
    #section-cta {
      align-items: flex-end;
    }

    .cta-content { width: 100%; }

    .cta-label {
      font-family: var(--font-display);
      font-size: 11px;
      font-weight: 700;
      letter-spacing: 0.3em;
      text-transform: uppercase;
      color: var(--accent);
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .cta-label::before {
      content: '';
      width: 24px;
      height: 1px;
      background: var(--accent);
    }

    .cta-headline {
      font-family: var(--font-display);
      font-weight: 900;
      font-size: clamp(60px, 12vw, 160px);
      line-height: 0.88;
      letter-spacing: -0.02em;
      text-transform: uppercase;
      margin-bottom: 48px;
    }

    .cta-headline .stroke {
      -webkit-text-stroke: 1px var(--white);
      color: transparent;
    }

    .cta-bottom {
      display: flex;
      justify-content: space-between;
      align-items: flex-end;
      border-top: 1px solid rgba(240,237,232,0.1);
      padding-top: 32px;
    }

    .cta-btn {
      display: inline-flex;
      align-items: center;
      gap: 16px;
      background: var(--accent);
      color: var(--black);
      text-decoration: none;
      padding: 18px 40px;
      font-size: 12px;
      font-weight: 600;
      letter-spacing: 0.15em;
      text-transform: uppercase;
      transition: transform 0.3s, background 0.3s;
      pointer-events: all;
    }

    .cta-btn:hover { background: var(--white); transform: translateY(-2px); }

    .cta-btn svg { transition: transform 0.3s; }
    .cta-btn:hover svg { transform: translateX(4px); }

    .footer-copy {
      font-size: 10px;
      letter-spacing: 0.15em;
      text-transform: uppercase;
      color: rgba(240,237,232,0.3);
      text-align: right;
      line-height: 2;
    }

    /* DRAG TO ROTATE */
    #drag-hint {
      position: fixed;
      bottom: 32px;
      right: 48px;
      z-index: 50;
      display: flex;
      align-items: center;
      gap: 8px;
      opacity: 0;
      transition: opacity 0.6s;
      pointer-events: none;
    }

    #drag-hint.visible { opacity: 1; }

    #drag-hint svg { opacity: 0.5; }

    #drag-hint span {
      font-size: 10px;
      letter-spacing: 0.18em;
      text-transform: uppercase;
      color: var(--gray);
    }

    /* SIDE TOGGLES */
    #side-toggles {
      position: fixed;
      top: 50%;
      right: 0;
      transform: translateY(-50%);
      z-index: 1001;
      display: flex;
      flex-direction: column;
      gap: 0;
      transition: right 0.4s cubic-bezier(0.16, 1, 0.3, 1);
      pointer-events: all;
    }

    #side-toggles.open { right: 340px; }

    .side-btn {
      background: rgba(10,10,10,0.9);
      border: 1px solid rgba(240,237,232,0.12);
      border-right: none;
      color: var(--accent);
      cursor: pointer;
      padding: 14px 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 6px;
      transition: background 0.2s;
      pointer-events: all;
      border-bottom: none;
    }

    .side-btn:last-child { border-bottom: 1px solid rgba(240,237,232,0.12); }
    .side-btn:hover { background: rgba(200,169,110,0.12); }
    .side-btn.active-panel { background: rgba(200,169,110,0.18); border-left-color: var(--accent); }

    .side-btn svg { display: block; }

    .side-btn span {
      font-size: 8px;
      letter-spacing: 0.15em;
      text-transform: uppercase;
      color: var(--accent);
      writing-mode: vertical-rl;
      text-orientation: mixed;
    }

    /* SETTINGS PANEL */
    #settings-panel {
      position: fixed;
      top: 0; right: 0;
      height: 100vh;
      width: 340px;
      background: rgba(10,10,10,0.96);
      border-left: 1px solid rgba(240,237,232,0.08);
      z-index: 1000;
      transform: translateX(100%);
      transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
      display: flex;
      flex-direction: column;
      font-family: var(--font-body);
      pointer-events: all;
    }

    #settings-panel.open { transform: translateX(0); }

    .settings-header {
      padding: 24px 24px 16px;
      border-bottom: 1px solid rgba(240,237,232,0.07);
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-shrink: 0;
    }

    .settings-header h3 {
      font-size: 11px;
      letter-spacing: 0.2em;
      text-transform: uppercase;
      color: var(--white);
      font-weight: 500;
    }

    .settings-header p {
      font-size: 10px;
      letter-spacing: 0.1em;
      color: var(--gray);
      margin-top: 4px;
    }

    .settings-section-tabs {
      display: flex;
      padding: 12px 16px;
      gap: 4px;
      border-bottom: 1px solid rgba(240,237,232,0.07);
      flex-wrap: wrap;
      flex-shrink: 0;
    }

    .tab-btn {
      padding: 5px 10px;
      font-size: 9px;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      background: transparent;
      border: 1px solid rgba(240,237,232,0.1);
      color: var(--gray);
      cursor: pointer;
      transition: all 0.2s;
      font-family: var(--font-body);
    }

    .tab-btn.active {
      background: var(--accent);
      border-color: var(--accent);
      color: var(--black);
    }

    .settings-body {
      flex: 1;
      overflow-y: auto;
      padding: 20px 24px;
      scrollbar-width: thin;
      scrollbar-color: rgba(200,169,110,0.3) transparent;
    }

    .settings-body::-webkit-scrollbar { width: 4px; }
    .settings-body::-webkit-scrollbar-thumb { background: rgba(200,169,110,0.3); border-radius: 2px; }

    .ctrl-group { margin-bottom: 20px; }

    .ctrl-label {
      font-size: 10px;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: var(--gray);
      margin-bottom: 8px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .ctrl-label span {
      font-family: var(--font-display);
      font-size: 14px;
      font-weight: 700;
      color: var(--accent);
      letter-spacing: 0;
    }

    .ctrl-slider {
      -webkit-appearance: none;
      width: 100%;
      height: 2px;
      background: rgba(240,237,232,0.1);
      outline: none;
      cursor: pointer;
      border-radius: 1px;
    }

    .ctrl-slider::-webkit-slider-thumb {
      -webkit-appearance: none;
      width: 12px; height: 12px;
      border-radius: 50%;
      background: var(--accent);
      cursor: pointer;
      transition: transform 0.2s;
    }

    .ctrl-slider::-webkit-slider-thumb:hover { transform: scale(1.4); }
    .ctrl-slider::-moz-range-thumb {
      width: 12px; height: 12px;
      border-radius: 50%;
      background: var(--accent);
      cursor: pointer;
      border: none;
    }

    .settings-footer {
      padding: 16px 24px;
      border-top: 1px solid rgba(240,237,232,0.07);
      display: flex;
      gap: 8px;
      flex-shrink: 0;
    }

    .settings-btn {
      flex: 1;
      padding: 10px;
      font-size: 9px;
      letter-spacing: 0.15em;
      text-transform: uppercase;
      cursor: pointer;
      font-family: var(--font-body);
      transition: all 0.2s;
    }

    .settings-btn-reset {
      background: transparent;
      border: 1px solid rgba(240,237,232,0.15);
      color: var(--gray);
    }

    .settings-btn-reset:hover { border-color: var(--white); color: var(--white); }

    .settings-btn-apply {
      background: var(--accent);
      border: 1px solid var(--accent);
      color: var(--black);
      font-weight: 600;
    }

    .settings-btn-apply:hover { background: var(--white); border-color: var(--white); }

    .section-name-badge {
      font-family: var(--font-display);
      font-size: 20px;
      font-weight: 800;
      text-transform: uppercase;
      color: var(--white);
      letter-spacing: 0.02em;
      margin-bottom: 16px;
      padding-bottom: 12px;
      border-bottom: 1px solid rgba(200,169,110,0.2);
    }

    /* PROGRESS BAR */
    .scroll-progress {
      position: fixed;
      top: 0; left: 0;
      height: 1px;
      background: var(--accent);
      z-index: 200;
      transition: width 0.1s linear;
      width: 0%;
    }