:root {
      --text-primary: #1a1a1a;
      --text-secondary: #4a4a4a;
      --text-tertiary: #8a8a8a;
      --text-quaternary: #b0b0b0;
      --surface: #ffffff;
      --surface-muted: #f5f5f5;
      --surface-raised: #fafafa;
      --border: #e5e5e5;
      --accent: #2563eb;
      --accent-light: #dbeafe;
      --danger: #dc2626;
      --positive: #16a34a;
      --warning: #d97706;
      --star: #d97706;
      --star-glow: #fbbf24;
      --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      --font-mono: "SF Mono", "Fira Code", "JetBrains Mono", "PingFang SC", monospace;
      --t-fast: 150ms;
      --t-normal: 250ms;
      --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }

    @media (prefers-color-scheme: dark) {
      :root {
        --text-primary: #f0f0f0;
        --text-secondary: #b0b0b0;
        --text-tertiary: #808080;
        --text-quaternary: #555555;
        --surface: #0a0a0a;
        --surface-muted: #1a1a1a;
        --surface-raised: #141414;
        --border: #2a2a2a;
        --accent: #60a5fa;
        --accent-light: rgba(96, 165, 250, 0.15);
        --star: #fbbf24;
        --star-glow: #fcd34d;
      }
    }

    * { margin: 0; padding: 0; box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      font-family: var(--font-sans);
      color: var(--text-primary);
      background: var(--surface);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    /* Navigation */
    .nav {
      position: fixed;
      top: 0; left: 0; right: 0;
      z-index: 1000;
      background: color-mix(in srgb, var(--surface) 85%, transparent);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
    }
    .nav-inner {
      max-width: 1100px;
      margin: 0 auto;
      padding: 0 24px;
      height: 60px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .nav-logo {
      font-size: 20px;
      font-weight: 700;
      letter-spacing: 0.05em;
      color: var(--accent);
      text-decoration: none;
    }
    .nav-links {
      display: flex;
      gap: 28px;
    }
    .nav-links a {
      font-size: 14px;
      color: var(--text-secondary);
      text-decoration: none;
      transition: color var(--t-fast) var(--ease-out);
    }
    .nav-links a:hover { color: var(--text-primary); }
    .nav-cta {
      padding: 6px 16px;
      border-radius: 8px;
      font-size: 13px;
      font-weight: 500;
      background: var(--text-primary);
      color: var(--surface);
      border: none;
      cursor: pointer;
      transition: opacity var(--t-fast) var(--ease-out);
    }
    .nav-cta:hover { opacity: 0.85; }
    .nav-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 4px;
    }
    .nav-toggle svg { width: 24px; height: 24px; color: var(--text-primary); }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      text-align: center;
      padding: 100px 24px 80px;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      top: -50%; left: -50%;
      width: 200%; height: 200%;
      background:
        radial-gradient(circle at 50% 50%, color-mix(in srgb, var(--accent) 15%, transparent) 0%, transparent 50%),
        radial-gradient(circle at 30% 70%, color-mix(in srgb, var(--accent) 8%, transparent) 0%, transparent 40%),
        radial-gradient(circle at 70% 30%, color-mix(in srgb, var(--accent) 5%, transparent) 0%, transparent 35%);
      pointer-events: none;
    }
    .hero::after {
      content: "";
      position: absolute;
      top: 0; left: 0;
      width: 100%; height: 100%;
      background-image:
        linear-gradient(rgba(37,99,235,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(37,99,235,0.04) 1px, transparent 1px);
      background-size: 48px 48px;
      pointer-events: none;
      z-index: 0;
    }
    .hero > * { position: relative; z-index: 1; }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 14px;
      border-radius: 100px;
      font-size: 13px;
      color: var(--accent);
      background: var(--accent-light);
      border: 1px solid color-mix(in srgb, var(--accent) 20%, transparent);
      margin-bottom: 24px;
    }
    .hero h1 {
      font-size: clamp(36px, 6vw, 64px);
      font-weight: 700;
      line-height: 1.08;
      letter-spacing: -0.02em;
      margin-bottom: 20px;
      background: linear-gradient(135deg, var(--text-primary) 50%, var(--accent) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero .tagline {
      font-size: clamp(16px, 2.5vw, 20px);
      color: var(--text-secondary);
      max-width: 560px;
      line-height: 1.7;
      margin-bottom: 8px;
    }
    .hero .slogan {
      font-size: 14px;
      color: var(--text-tertiary);
      letter-spacing: 0.05em;
    }
    .hero-cta {
      margin-top: 40px;
      display: flex;
      gap: 12px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .btn {
      padding: 12px 28px;
      border-radius: 10px;
      font-size: 15px;
      font-weight: 500;
      cursor: pointer;
      transition: all var(--t-fast) var(--ease-out);
      border: 1px solid var(--border);
      background: transparent;
      color: var(--text-primary);
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn:hover { background: var(--surface-muted); }
    .btn-primary {
      background: var(--accent);
      color: #fff;
      border-color: var(--accent);
    }
    .btn-primary:hover { opacity: 0.9; background: var(--accent); }

    /* Sections */
    .section { width: 100%; padding: 100px 24px; }
    .container { max-width: 1000px; margin: 0 auto; }
    .sec-label {
      font-size: 12px;
      font-weight: 500;
      color: var(--accent);
      letter-spacing: 0.1em;
      text-transform: uppercase;
      margin-bottom: 12px;
      text-align: center;
    }
    .sec-title {
      font-size: clamp(26px, 4vw, 36px);
      font-weight: 600;
      text-align: center;
      margin-bottom: 12px;
      line-height: 1.2;
    }
    .sec-sub {
      font-size: 16px;
      color: var(--text-secondary);
      text-align: center;
      max-width: 560px;
      margin: 0 auto 48px;
      line-height: 1.6;
    }

    /* Interaction Demo */
    .demo-wrap {
      border: 1px solid var(--border);
      border-radius: 14px;
      overflow: hidden;
      background: var(--surface);
      box-shadow: 0 2px 16px color-mix(in srgb, var(--text-primary) 3%, transparent);
    }
    .demo-header {
      display: flex;
      gap: 6px;
      padding: 14px 18px;
      border-bottom: 1px solid var(--border);
      background: var(--surface-muted);
    }
    .demo-dot { width: 10px; height: 10px; border-radius: 50%; }
    .demo-dot-red { background: #ff5f57; }
    .demo-dot-yellow { background: #febc2e; }
    .demo-dot-green { background: #28c840; }
    .demo-tabs {
      display: flex;
      gap: 0;
      padding: 0 16px;
      border-bottom: 1px solid var(--border);
      background: var(--surface-muted);
      overflow-x: auto;
      -webkit-overflow-scrolling: touch;
    }
    .demo-tab {
      padding: 10px 18px;
      font-size: 13px;
      font-family: inherit;
      border: none;
      background: transparent;
      color: var(--text-tertiary);
      cursor: pointer;
      border-bottom: 2px solid transparent;
      margin-bottom: -1px;
      transition: all var(--t-fast) var(--ease-out);
      white-space: nowrap;
    }
    .demo-tab.active { color: var(--text-primary); border-bottom-color: var(--text-primary); }
    .demo-tab:hover { color: var(--text-secondary); }
    .demo-body { padding: 24px; min-height: 320px; }
    .chat-msg { display: flex; gap: 10px; margin-bottom: 16px; align-items: flex-start; }
    .chat-avatar {
      width: 30px; height: 30px;
      border-radius: 50%;
      flex-shrink: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 12px;
      font-weight: 600;
    }
    .chat-user .chat-avatar { background: var(--text-primary); color: var(--surface); }
    .chat-ai .chat-avatar { background: var(--accent-light); color: var(--accent); }
    .chat-bubble {
      padding: 10px 14px;
      border-radius: 12px;
      font-size: 14px;
      line-height: 1.7;
      max-width: 85%;
    }
    .chat-user .chat-bubble {
      background: var(--surface-muted);
      border: 1px solid var(--border);
    }
    .chat-ai .chat-bubble {
      background: var(--accent-light);
      border: 1px solid color-mix(in srgb, var(--accent) 20%, transparent);
    }
    .demo-input {
      display: flex;
      gap: 8px;
      padding: 14px 18px;
      border-top: 1px solid var(--border);
      background: var(--surface-muted);
    }
    .demo-input input {
      flex: 1;
      padding: 10px 14px;
      border: 1px solid var(--border);
      border-radius: 8px;
      font-size: 14px;
      font-family: inherit;
      background: var(--surface);
      color: var(--text-primary);
      outline: none;
      transition: border-color var(--t-fast) var(--ease-out);
    }
    .demo-input input:focus { border-color: var(--text-primary); }
    .demo-input input::placeholder { color: var(--text-tertiary); }
    .demo-input button {
      padding: 10px 18px;
      border-radius: 8px;
      font-size: 14px;
      font-weight: 500;
      font-family: inherit;
      border: none;
      background: var(--accent);
      color: #fff;
      cursor: pointer;
      transition: opacity var(--t-fast) var(--ease-out);
      flex-shrink: 0;
    }
    .demo-input button:hover { opacity: 0.9; }
    .demo-input button:disabled,
    .demo-input input:disabled {
      opacity: 0.5;
      cursor: not-allowed;
    }
    .typing { display: inline-flex; gap: 3px; align-items: center; height: 20px; }
    .typing span {
      width: 5px; height: 5px;
      border-radius: 50%;
      background: var(--text-tertiary);
      animation: blink 1.4s infinite both;
    }
    .typing span:nth-child(2) { animation-delay: 0.2s; }
    .typing span:nth-child(3) { animation-delay: 0.4s; }
    @keyframes blink { 0%,80%,100%{opacity:0.3;}40%{opacity:1;} }

    /* Result cards */
    .result-card {
      border: 1px solid var(--border);
      border-radius: 10px;
      padding: 16px;
      margin-top: 12px;
      background: var(--surface-muted);
      animation: fadeIn 0.4s var(--ease-out);
    }
    @keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }
    .result-card h5 { font-size: 13px; font-weight: 600; margin-bottom: 8px; color: var(--text-primary); }
    .result-card .result-body { font-size: 13px; color: var(--text-secondary); line-height: 1.7; }

    /* Deliverables */
    .deliv-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }
    .deliv-card {
      border: 1px solid var(--border);
      border-radius: 12px;
      padding: 0;
      text-align: left;
      transition: all 0.3s var(--ease-out);
      background: var(--surface);
      overflow: hidden;
    }
    .deliv-card.reveal:hover {
      border-color: var(--accent);
      transform: scale(1.02) translateY(-4px) !important;
      box-shadow: 0 16px 40px color-mix(in srgb, var(--accent) 14%, transparent);
    }
    .deliv-body {
      padding: 28px 24px;
    }
    .deliv-header {
      display: flex;
      align-items: flex-start;
      gap: 14px;
      margin-bottom: 14px;
    }
    .deliv-icon {
      width: 48px; height: 48px;
      flex-shrink: 0;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: var(--accent-light);
      border: 1px solid color-mix(in srgb, var(--accent) 20%, transparent);
    }
    .deliv-icon svg {
      width: 22px; height: 22px;
      color: var(--accent);
    }
    .deliv-label {
      font-size: 20px;
      font-weight: 700;
      line-height: 1.4;
      padding-top: 4px;
    }
    .deliv-label-sub {
      font-weight: 500;
      font-size: 15px;
      color: var(--accent);
      white-space: nowrap;
    }
    .deliv-desc { font-size: 14px; color: var(--text-secondary); line-height: 1.6; margin-bottom: 18px; }
    .deliv-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      justify-content: flex-start;
    }
    .deliv-tag {
      display: inline-block;
      padding: 4px 12px;
      border-radius: 4px;
      font-size: 11px;
      font-weight: 500;
      background: var(--surface-muted);
      color: var(--text-tertiary);
      border: 1px solid var(--border);
    }

    /* Pricing Table */
    .ptable-wrap {
      overflow-x: auto;
      margin-bottom: 28px;
      -webkit-overflow-scrolling: touch;
    }
    .ptable {
      width: 100%;
      border-collapse: collapse;
      font-size: 14px;
      text-align: center;
      background: var(--surface);
      border-radius: 16px;
      overflow: hidden;
      border: 1px solid var(--border);
    }
    .ptable thead th {
      padding: 16px 12px;
      font-weight: 700;
      font-size: 16px;
      color: var(--text-primary);
      background: var(--surface-muted);
      border-bottom: 2px solid var(--border);
    }
    .ptable thead th:first-child {
      text-align: left;
      padding-left: 24px;
    }
    .pt-col-hover {
      /* only used for star animation trigger on header */
    }

    /* Pricing: star interaction */
    .ptr-stars {
      display: inline-flex;
      gap: 2px;
      margin-left: 6px;
      vertical-align: middle;
    }
    .ptr-star {
      opacity: 0.08;
      color: var(--star);
      display: inline-flex;
      align-items: center;
      filter: grayscale(1);
      transition: filter 0.25s, opacity 0.25s;
      line-height: 1;
    }
    .ptr-star svg {
      width: 16px;
      height: 16px;
      display: block;
    }
    .pt-col-hover .ptr-star {
      animation: starPop 0.55s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
      animation-delay: calc(var(--d, 0) * 0.22s);
      filter: none;
    }
    .pt-col-hover .ptr-star svg {
      filter: drop-shadow(0 0 4px color-mix(in srgb, var(--star) 50%, transparent));
    }
    .ptr-terms-row:hover .ptr-terms-arrow {
      color: var(--accent);
    }
    @keyframes starPop {
      0% { opacity: 0.08; transform: scale(0.2) rotate(-20deg); filter: grayscale(1); }
      50% { opacity: 1; transform: scale(1.5) rotate(8deg); filter: none; color: var(--star-glow); text-shadow: 0 0 8px color-mix(in srgb, var(--star-glow) 50%, transparent); }
      100% { opacity: 1; transform: scale(1) rotate(0deg); filter: none; color: var(--star); }
    }

    /* Row highlight (replaces column highlight for body rows) */
    .ptr-row-hover {
      background: var(--surface-muted) !important;
    }
    .ptable tbody td {
      padding: 12px;
      border-bottom: 1px solid var(--border);
      color: var(--text-secondary);
      vertical-align: middle;
    }
    .ptable tbody td:first-child {
      text-align: left;
      padding-left: 24px;
      font-weight: 500;
      color: var(--text-primary);
      white-space: nowrap;
    }
    .ptr-price td {
      padding: 24px 12px 18px;
      border-bottom: 2px solid var(--border);
      position: relative;
    }
    .ptr-amount {
      font-size: 40px;
      font-weight: 900;
      color: var(--text-primary);
      letter-spacing: -0.02em;
      font-feature-settings: "tnum";
    }
    .ptr-yen {
      font-size: inherit;
      font-weight: inherit;
      color: var(--accent);
      margin-right: 1px;
    }
    .ptr-amount-sub {
      display: block;
      font-size: 11px;
      font-weight: 500;
      color: var(--text-tertiary);
      margin-top: 6px;
      letter-spacing: 0.03em;
    }
    .ptr-price td::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 10%;
      width: 80%;
      height: 2px;
      background: linear-gradient(90deg, transparent, var(--accent), transparent);
      opacity: 0.3;
      border-radius: 1px;
    }
    .ptr-credits td {
      padding: 14px 12px;
      font-size: 14px;
      color: var(--text-secondary);
    }
    .ptr-credits strong {
      font-size: 18px;
      font-weight: 700;
      color: var(--accent);
    }
    .ptr-check {
      font-size: 16px;
      font-weight: 700;
      color: var(--positive) !important;
    }
    /* Database scope cell (colspan) */
    .ptr-db-cell {
      text-align: center;
      padding: 8px 16px;
    }
    .ptr-db-cell .db-row {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 5px;
      flex-wrap: wrap;
      margin-bottom: 5px;
    }
    .ptr-db-cell .db-row:last-child {
      margin-bottom: 0;
    }
    .db-label {
      font-size: 11px;
      font-weight: 600;
      color: var(--text-primary);
      margin-right: 3px;
      white-space: nowrap;
    }
    .db-tag {
      display: inline-block;
      padding: 1px 7px;
      font-size: 11px;
      font-weight: 500;
      border-radius: 4px;
      background: var(--accent-light);
      color: var(--accent);
      border: 1px solid color-mix(in srgb, var(--accent) 15%, transparent);
      white-space: nowrap;
      line-height: 1.7;
    }
    .ptr-dash {
      color: var(--text-quaternary) !important;
    }
    .ptr-terms-row {
      cursor: pointer;
    }
    .ptr-terms-row td {
      border-bottom: none !important;
      vertical-align: top;
      background: var(--surface-muted);
      padding: 6px 16px !important;
      transition: padding 0.25s var(--ease-out);
    }
    .ptr-terms-row.expanded td {
      padding: 8px 16px !important;
    }
    .ptr-terms-row td:first-child {
      font-weight: 600;
      color: var(--text-primary);
      width: 100px;
    }
    .ptr-terms-arrow {
      display: inline-block;
      font-size: 10px;
      color: var(--text-tertiary);
      margin-left: 4px;
      transition: transform 0.25s var(--ease-out);
    }
    .ptr-terms-row.expanded .ptr-terms-arrow {
      transform: rotate(90deg);
    }
    .ptr-terms-cell {
      font-size: 11px;
      line-height: 1.5;
      color: var(--text-tertiary);
    }
    .ptr-terms-cell span {
      display: block;
    }
    /* collapsed state — hide all spans in the cell */
    .ptr-terms-row.collapsed .ptr-terms-cell span {
      display: none;
    }
    .ptr-terms-row.expanded .ptr-terms-cell span {
      display: block;
    }
    .ptr-terms-note {
      margin-top: 8px;
      padding-top: 8px;
      border-top: 1px solid var(--border);
      font-size: 11px;
      color: var(--text-quaternary);
    }

    /* Contact */
    .contact-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      max-width: 560px;
      margin: 0 auto;
    }
    .contact-card {
      border: 1px solid var(--border);
      border-radius: 12px;
      padding: 28px;
      text-align: center;
      transition: all var(--t-fast) var(--ease-out);
      background: var(--surface);
    }
    .contact-card.reveal:hover {
      border-color: var(--accent);
      transform: translateY(-3px) !important;
      box-shadow: 0 6px 24px color-mix(in srgb, var(--accent) 10%, transparent);
    }
    .contact-icon {
      width: 44px; height: 44px;
      margin: 0 auto 14px;
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: var(--surface-muted);
      border: 1px solid var(--border);
    }
    .contact-icon svg { width: 20px; height: 20px; color: var(--text-primary); }
    .contact-card h4 { font-size: 15px; font-weight: 600; margin-bottom: 4px; }
    .contact-card p { font-size: 14px; color: var(--text-secondary); }
    .contact-card a { color: var(--accent); text-decoration: none; }
    .contact-card a:hover { text-decoration: underline; }

    /* WeChat QR — 点击切换，兼容触屏 */
    #wechat-card { position: relative; cursor: pointer; }
    .qr-hover {
      display: none;
      position: absolute;
      right: calc(100% + 16px);
      top: 50%;
      transform: translateY(-50%);
      z-index: 20;
    }
    .qr-hover.active { display: block; }
    .qr-hover img {
      width: 160px;
      height: 160px;
      border-radius: 10px;
      box-shadow: 0 8px 30px rgba(0,0,0,0.2);
      border: 2px solid var(--border);
      background: var(--surface);
    }
    /* 触屏/鼠标均通过 JS 点击切换，不依赖 hover */

    /* Mobile Menu (样式从 HTML 移入 CSS) */
    #mobile-menu {
      display: none;
      position: fixed;
      top: 60px; left: 0; right: 0; bottom: 0;
      background: var(--surface);
      z-index: 999;
      padding: 24px;
    }
    #mobile-menu.open { display: block; }
    .mobile-menu-links {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .mobile-menu-links a {
      font-size: 16px;
      color: var(--text-primary);
      text-decoration: none;
      padding: 8px 0;
      border-bottom: 1px solid var(--border);
    }
    .mobile-menu-links a:last-child { border-bottom: none; }

    /* Footer */
    .footer {
      text-align: center;
      padding: 40px 24px;
      font-size: 13px;
      color: var(--text-quaternary);
      border-top: 1px solid var(--border);
    }
    .footer-links {
      display: flex;
      justify-content: center;
      gap: 24px;
      margin-bottom: 16px;
      flex-wrap: wrap;
    }
    .footer-links a {
      color: var(--text-tertiary);
      text-decoration: none;
      font-size: 13px;
      transition: color var(--t-fast) var(--ease-out);
    }
    .footer-links a:hover { color: var(--text-primary); }

    /* Tablet */
    @media (max-width: 1024px) {
      .workflow-card { padding: 28px 90px 28px 28px; }
      .workflow-grid { gap: 16px; }
      .deliv-grid { gap: 16px; }
      .deliv-body { padding: 28px 20px; }
      .deliv-icon { width: 44px; height: 44px; }
      .deliv-icon svg { width: 20px; height: 20px; }
      .deliv-label { font-size: 18px; }
      .deliv-label-sub { font-size: 14px; }
      .wf-num { font-size: 30px; min-width: 36px; }
      .wf-bg-icon { width: 60px; height: 60px; right: 16px; opacity: 0.08; }
      .workflow-card h3 { font-size: 20px; }
      .ptable { font-size: 13px; }
      .ptable thead th { font-size: 15px; padding: 14px 10px; }
      .ptable tbody td { padding: 11px 10px; }
      .ptable tbody td:first-child { padding-left: 18px; }
      .ptr-amount { font-size: 32px; }
      .ptr-price td { padding: 16px 10px; }
      .preview-grid { gap: 8px; }
      .preview-item { padding: 14px 10px; }
    }

    /* Mobile */
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .nav-cta { display: none; }
      .nav-toggle { display: block; }
      .section { padding: 48px 16px; }
      .hero { padding: 80px 16px 48px; }
      .hero-cta { flex-direction: column; width: 100%; max-width: 260px; }
      .hero-cta .btn,
      .contact-section .btn-primary { width: 100%; justify-content: center; }
      .sec-title { font-size: clamp(22px, 5vw, 28px); }
      .sec-sub { font-size: 14px; margin-bottom: 32px; }
      .demo-body { padding: 16px; min-height: 260px; }
      .chat-bubble { max-width: 92%; font-size: 13px; }
      .workflow-card { padding: 20px 70px 20px 20px; }
      .deliv-grid { grid-template-columns: 1fr; }
      .workflow-grid { grid-template-columns: 1fr; }
      .contact-grid { grid-template-columns: 1fr; }
      .deliv-body { padding: 20px 16px; }
      .deliv-header { gap: 10px; flex-wrap: wrap; }
      .deliv-icon { width: 36px; height: 36px; }
      .deliv-icon svg { width: 16px; height: 16px; }
      .deliv-label { font-size: 16px; padding-top: 0; }
      .deliv-label-sub { font-size: 12px; display: block; margin-top: 2px; white-space: normal; }
      .deliv-desc { font-size: 13px; }
      .deliv-tag { font-size: 10px; padding: 3px 10px; }
      .wf-top { gap: 8px; margin-bottom: 14px; }
      .wf-num { font-size: 24px; min-width: 28px; }
      .wf-bg-icon { width: 40px; height: 40px; opacity: 0.06; right: 12px; }
      .workflow-card h3 { font-size: 16px; }
      .wf-result-tag { font-size: 12px; padding: 3px 12px; }
      .wf-desc { font-size: 13px; }
      .wf-metrics { flex-direction: column; gap: 4px; padding-top: 10px; }
      .wf-metric { font-size: 11px; }
      .thinking-progress { padding: 12px 14px; }
      .tp-text { font-size: 12px; }
      .preview-grid { flex-direction: column; gap: 6px; }
      .preview-item { display: flex; align-items: center; gap: 10px; padding: 10px 14px; text-align: left; }
      .preview-item svg { width: 24px; height: 24px; margin: 0; }
      .preview-item .pv-label { font-size: 11px; }
      .suggestion-tag { font-size: 12px; padding: 6px 14px; }
      .contact-card { padding: 20px; }
      .footer { padding: 28px 16px; }
      .footer-links { gap: 16px; }
      .ptable { font-size: 13px; }
      .ptable thead th { font-size: 14px; padding: 12px 8px; }
      .ptable tbody td { padding: 10px 8px; font-size: 13px; }
      .ptable tbody td:first-child { padding-left: 14px; font-size: 13px; }
      .ptr-amount { font-size: 30px; }
      .ptr-price td { padding: 14px 8px; }
      .ptr-credits td { font-size: 13px; padding: 10px 8px; }
      .ptr-credits strong { font-size: 16px; }
      .ptr-terms-cell { padding: 8px 12px !important; font-size: 10px; }
    }

    /* ===== Workflow / 场景化方案 ===== */
    .workflow-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      position: relative;
    }
    .workflow-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 12px;
      padding: 32px 120px 32px 32px;
      position: relative;
      transition: all 0.3s var(--ease-out);
    }
    .workflow-card.reveal:hover {
      border-color: var(--wf-accent, var(--accent));
      transform: translateY(-3px) !important;
      box-shadow: 0 6px 24px color-mix(in srgb, var(--wf-accent, var(--accent)) 10%, transparent);
    }
    .wf-top {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 18px;
    }
    .wf-num {
      font-size: 36px;
      font-weight: 800;
      line-height: 1;
      letter-spacing: -0.04em;
      opacity: 0.15;
      font-feature-settings: "tnum";
      color: var(--wf-accent, var(--accent));
      min-width: 44px;
    }
    .wf-bg-icon {
      position: absolute;
      right: 20px;
      top: 50%;
      transform: translateY(-50%);
      width: 80px;
      height: 80px;
      display: flex;
      align-items: center;
      justify-content: center;
      pointer-events: none;
      z-index: 0;
      opacity: 0.12;
    }
    .wf-bg-icon svg {
      width: 100%;
      height: 100%;
      color: var(--wf-accent, var(--accent));
      stroke-width: 1.5;
    }
    .workflow-card h3 {
      font-size: 22px;
      font-weight: 700;
      white-space: nowrap;
    }
    .wf-result-tag {
      display: inline-block;
      padding: 4px 14px;
      border-radius: 100px;
      font-size: 13px;
      font-weight: 500;
      margin-bottom: 14px;
      background: color-mix(in srgb, var(--wf-accent, var(--accent)) 10%, transparent);
      color: var(--wf-accent, var(--accent));
    }
    .wf-desc {
      font-size: 14px;
      color: var(--text-secondary);
      line-height: 1.7;
      margin-bottom: 16px;
    }
    .wf-metrics {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      padding-top: 14px;
      border-top: 1px solid var(--border);
    }
    .wf-metric {
      display: inline-flex;
      align-items: center;
      gap: 5px;
      font-size: 12px;
      color: var(--text-tertiary);
    }
    .wf-metric strong {
      color: var(--wf-accent, var(--accent));
      font-weight: 600;
    }
    .workflow-card.reveal {
      transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
      transition-delay: calc(var(--wf-order, 0) * 0.12s);
    }

    /* ===== Thinking Progress ===== */
    .thinking-progress {
      margin: 16px 0 20px;
      padding: 16px 20px;
      background: var(--surface-muted);
      border-radius: 12px;
      border: 1px solid var(--border);
    }
    .tp-step {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 7px 0;
      opacity: 0;
      transform: translateX(-8px);
      transition: all 0.4s var(--ease-out);
    }
    .tp-step.visible {
      opacity: 1;
      transform: translateX(0);
    }
    .tp-step.active .tp-indicator {
      border: 2px solid var(--accent);
      border-top-color: transparent;
      animation: tp-spin 0.7s linear infinite;
    }
    .tp-step.done { opacity: 0.85; }
    .tp-step.done .tp-indicator {
      background: var(--positive);
      border-color: var(--positive);
    }
    .tp-step.done .tp-indicator::after {
      content: '';
      position: absolute;
      top: 3px; left: 6px;
      width: 5px; height: 9px;
      border: solid #fff;
      border-width: 0 2px 2px 0;
      transform: rotate(45deg);
    }
    .tp-step .tp-indicator {
      width: 20px;
      height: 20px;
      border-radius: 50%;
      flex-shrink: 0;
      position: relative;
      border: 2px solid var(--border);
      box-sizing: border-box;
    }
    .tp-step.pending .tp-indicator {
      background: transparent;
      border-color: var(--border);
    }
    @keyframes tp-spin {
      to { transform: rotate(360deg); }
    }
    .tp-text {
      font-size: 13px;
      color: var(--text-secondary);
      line-height: 1.4;
    }
    .tp-step.done .tp-text {
      color: var(--text-primary);
    }

    /* ===== Preview Thumbnails ===== */
    .preview-grid {
      display: flex;
      gap: 12px;
      margin: 16px 0;
    }
    .preview-item {
      flex: 1;
      min-width: 0;
      border: 1px solid var(--border);
      border-radius: 10px;
      padding: 16px 12px;
      text-align: center;
      background: var(--surface);
      transition: all 0.25s var(--ease-out);
      cursor: default;
    }
    .preview-item:hover {
      border-color: var(--pv-color, var(--accent));
      transform: translateY(-3px);
      box-shadow: 0 6px 16px color-mix(in srgb, var(--pv-color, var(--accent)) 10%, transparent);
    }
    .preview-item svg {
      width: 36px;
      height: 36px;
      margin-bottom: 8px;
      color: var(--pv-color, var(--accent));
      display: block;
      margin-left: auto;
      margin-right: auto;
    }
    .preview-item .pv-label {
      font-size: 12px;
      font-weight: 500;
      color: var(--text-secondary);
    }

    /* ===== Suggestion Bubbles ===== */
    .suggestion-bubbles {
      margin-top: 16px;
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }
    .suggestion-tag {
      padding: 8px 18px;
      border-radius: 100px;
      font-size: 13px;
      font-family: inherit;
      background: var(--surface-muted);
      border: 1px solid var(--border);
      color: var(--text-secondary);
      cursor: pointer;
      transition: all 0.2s var(--ease-out);
      line-height: 1.4;
    }
    .suggestion-tag:hover {
      border-color: var(--accent);
      color: var(--accent);
      background: var(--accent-light);
    }
    .suggestion-tag:active {
      transform: scale(0.96);
    }
    .suggestion-tag.fade {
      opacity: 0.3;
      pointer-events: none;
    }

    /* ===== Demo scene transitions ===== */
    .demo-scene {
      display: none;
      animation: demo-fade-in 0.3s var(--ease-out);
    }
    .demo-scene.active {
      display: block;
    }
    @keyframes demo-fade-in {
      from { opacity: 0; }
      to { opacity: 1; }
    }
    .followup-msg {
      animation: fadeSlideIn 0.3s var(--ease-out);
    }
    @keyframes fadeSlideIn {
      from { opacity: 0; transform: translateY(8px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* Scroll reveal */
    .reveal {
      opacity: 0;
      transform: translateY(24px);
      transition: all 0.6s var(--ease-out);
    }
    .reveal.visible {
      opacity: 1;
      transform: translateY(0);
    }