:root {
      --bg-body: #021b3b;
      --bg-page: #021b3b;
      --bg-card: #ffffff;
      --bg-soft: #f4f5fb;
      --accent: #f97316;      /* orange chic */
      --accent-soft: #fff7ed;
      --accent-dark: #ea580c;
      --text-main: #020617;
      --text-muted: #6b7280;
      --border-soft: #e5e7eb;
      --shadow-soft: 0 30px 80px rgba(15, 23, 42, 0.25);
      --radius-lg: 24px;
      --radius-pill: 999px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      /* ✅ 深蓝色背景 */
      background: linear-gradient(180deg, #021b3b 0%, #010716 60%);
      color: var(--text-main);
      line-height: 1.7;
    }

    a {
      color: var(--accent-dark);
      text-decoration: none;
    }

    a:hover {
      text-decoration: underline;
    }

    .page {
      max-width: 1200px;
      margin: 0 auto;
      padding: 20px 16px 64px;
    }

    @media (min-width: 1024px) {
      .page {
        padding: 32px 24px 80px;
      }
    }

    /* ---------- HERO ---------- */
    .hero {
      position: relative;
      border-radius: 30px;
      overflow: hidden;
      margin-bottom: 26px;
      background: radial-gradient(circle at top left, #f97316 0, #021b3b 45%, #020617 100%);
      color: #f9fafb;
      box-shadow: var(--shadow-soft);
      padding: 22px 18px 24px;
      display: grid;
      grid-template-columns: 1.1fr;
      gap: 20px;
    }

    @media (min-width: 900px) {
      .hero {
        padding: 30px 32px;
        grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.9fr);
        align-items: center;
      }
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      padding: 4px 14px;
      border-radius: var(--radius-pill);
      background: rgba(15, 23, 42, 0.5);
      font-size: 0.76rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.12em;
    }

    .hero-badge-dot {
      width: 10px;
      height: 10px;
      border-radius: 999px;
      background: #22c55e;
      box-shadow: 0 0 0 6px rgba(34, 197, 94, 0.25);
    }

    .hero-title {
      margin: 14px 0 8px;
      font-size: clamp(2.1rem, 3.2vw, 2.6rem);
      letter-spacing: -0.04em;
    }

    .hero-subtitle {
      max-width: 620px;
      font-size: 0.98rem;
      color: #e5e7eb;
    }

    .hero-meta {
      margin-top: 14px;
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      font-size: 0.82rem;
      color: #cbd5f5;
    }

    .hero-meta span {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .hero-meta-dot {
      width: 4px;
      height: 4px;
      border-radius: 999px;
      background: rgba(148, 163, 184, 0.8);
    }

    .hero-cta-row {
      margin-top: 16px;
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .btn-primary {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 10px 18px;
      border-radius: var(--radius-pill);
      border: none;
      background: #ffffff;
      color: #0f172a;
      font-size: 0.9rem;
      font-weight: 600;
      cursor: pointer;
      box-shadow: 0 15px 40px rgba(15, 23, 42, 0.5);
    }

    .btn-primary span.icon {
      font-size: 1.1rem;
    }

    .btn-ghost {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 9px 16px;
      border-radius: var(--radius-pill);
      border: 1px solid rgba(226, 232, 240, 0.4);
      background: transparent;
      color: #e5e7eb;
      font-size: 0.86rem;
      font-weight: 500;
      cursor: pointer;
    }

    .hero-right {
      position: relative;
      border-radius: 22px;
      background: radial-gradient(circle at top, rgba(15, 23, 42, 0.5), rgba(15, 23, 42, 0.95));
      padding: 10px;
      backdrop-filter: blur(10px);
    }

    .hero-device-frame {
      border-radius: 20px;
      overflow: hidden;
      border: 1px solid rgba(148, 163, 184, 0.4);
      background: #020617;
    }

    .hero-device-img {
      display: block;
      width: 100%;
      height: auto;
    }

    .hero-device-label {
      padding: 8px 10px;
      font-size: 0.78rem;
      color: #e5e7eb;
      border-top: 1px solid rgba(148, 163, 184, 0.4);
      background: linear-gradient(to right, rgba(248, 250, 252, 0.08), transparent);
    }

    .hero-floating-tag {
      position: absolute;
      right: 16px;
      bottom: -10px;
      padding: 6px 14px;
      border-radius: var(--radius-pill);
      background: #f97316;
      color: #111827;
      font-size: 0.8rem;
      font-weight: 600;
      box-shadow: 0 16px 40px rgba(15, 23, 42, 0.9);
    }

    /* ---------- LAYOUT ARTICLE ---------- */
    .layout {
      display: grid;
      grid-template-columns: minmax(0, 1fr);
      gap: 22px;
      margin-top: 26px;
    }

    @media (min-width: 1000px) {
      .layout {
        grid-template-columns: minmax(0, 0.7fr) minmax(0, 0.3fr);
        align-items: flex-start;
      }
    }

    .article-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 24px 18px 26px;
      box-shadow: 0 24px 60px rgba(15, 23, 42, 0.18);
      border: 1px solid rgba(229, 231, 235, 0.9);
    }

    @media (min-width: 900px) {
      .article-card {
        padding: 30px 28px 32px;
      }
    }

    .article-lead {
      font-size: 1rem;
      margin: 0 0 18px;
      color: #111827;
    }

    h2 {
      font-size: 1.35rem;
      margin: 24px 0 12px;
      letter-spacing: -0.02em;
    }

    h3 {
      font-size: 1.02rem;
      margin: 18px 0 8px;
      letter-spacing: -0.01em;
    }

    p {
      margin: 0 0 10px;
      color: #111827;
      font-size: 0.96rem;
    }

    ul, ol {
      padding-left: 20px;
      margin: 0 0 12px;
      font-size: 0.96rem;
    }

    li {
      margin-bottom: 6px;
    }

    strong {
      font-weight: 600;
    }

    .accent-intro {
      border-left: 3px solid var(--accent);
      padding-left: 12px;
      margin-bottom: 18px;
    }

    .highlight-quote {
      margin: 18px 0;
      padding: 12px 14px;
      border-radius: 18px;
      background: var(--accent-soft);
      border: 1px solid #fed7aa;
      font-size: 0.95rem;
    }

    .highlight-quote span {
      font-size: 1.3rem;
      margin-right: 6px;
    }

    .info-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 14px;
      margin: 12px 0 16px;
    }

    @media (min-width: 800px) {
      .info-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }
    }

    .info-card {
      border-radius: 18px;
      border: 1px solid var(--border-soft);
      background: #f9fafb;
      padding: 12px 14px;
      font-size: 0.94rem;
    }

    .info-card h3 {
      margin-top: 0;
      margin-bottom: 6px;
      font-size: 0.95rem;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: #4b5563;
    }

    .tag-row {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin: 6px 0 2px;
    }

    .tag-pill {
      font-size: 0.78rem;
      padding: 4px 9px;
      border-radius: var(--radius-pill);
      background: #e5e7eb;
      color: #374151;
    }

    /* ---------- IMAGES ARTICLE ---------- */
    figure {
      margin: 18px 0 20px;
      border-radius: 20px;
      overflow: hidden;
      border: 1px solid #e5e7eb;
      background: #020617;
    }

    .figure-inner {
      display: flex;
      flex-direction: column;
    }

    @media (min-width: 800px) {
      .figure-inner {
        flex-direction: row;
      }
    }

    figure img {
      display: block;
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    .figure-text {
      padding: 12px 14px 14px;
      font-size: 0.85rem;
      color: #e5e7eb;
      background: radial-gradient(circle at top, rgba(15, 23, 42, 0.8), #020617);
    }

    .figure-text strong {
      color: #ffffff;
    }

    figcaption {
      margin-top: 4px;
      font-size: 0.78rem;
      color: #9ca3af;
    }

    /* ---------- SIDEBAR ---------- */
    .sidebar {
      position: sticky;
      top: 20px;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    @media (max-width: 999px) {
      .sidebar {
        position: static;
      }
    }

    .sidebar-card {
      background: rgba(15, 23, 42, 0.9);
      border-radius: 18px;
      padding: 14px 14px 16px;
      border: 1px solid rgba(148, 163, 184, 0.7);
      color: #e5e7eb;
    }

    .sidebar-card h3 {
      margin-top: 0;
      margin-bottom: 8px;
      font-size: 0.94rem;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: #e5e7eb;
    }

    .sidebar-card p,
    .sidebar-card li {
      font-size: 0.86rem;
      color: #e5e7eb;
    }

    .toc-list {
      list-style: none;
      padding-left: 0;
      margin: 8px 0 4px;
    }

    .toc-list li {
      margin-bottom: 4px;
    }

    .toc-list a {
      font-size: 0.85rem;
      color: #cbd5f5;
      text-decoration: none;
    }

    .toc-list a:hover {
      color: #f97316;
    }

    .sidebar-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 3px 10px;
      border-radius: var(--radius-pill);
      background: rgba(15, 23, 42, 0.7);
      font-size: 0.75rem;
      margin-bottom: 6px;
    }

    .sidebar-badge-dot {
      width: 7px;
      height: 7px;
      border-radius: 999px;
      background: #22c55e;
    }

    .sidebar-cta-btn {
      margin-top: 8px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      width: 100%;
      padding: 8px 10px;
      font-size: 0.86rem;
      border-radius: var(--radius-pill);
      border: none;
      cursor: pointer;
      background: linear-gradient(to right, #f97316, #ea580c);
      color: #111827;
      font-weight: 600;
    }

    .sidebar-cta-btn span.icon {
      font-size: 1.05rem;
    }

    .sidebar-note {
      font-size: 0.8rem;
      color: #9ca3af;
      margin-top: 6px;
    }

    /* ---------- FAQ / DISCLAIMER ---------- */
    .faq {
      margin-top: 26px;
      padding-top: 18px;
      border-top: 1px dashed var(--border-soft);
    }

    .faq-item {
      margin-bottom: 12px;
    }

    .faq-q {
      font-weight: 600;
      font-size: 0.95rem;
      margin-bottom: 4px;
    }

    .disclaimer {
      margin-top: 22px;
      padding-top: 14px;
      border-top: 1px solid var(--border-soft);
      font-size: 0.8rem;
      color: var(--text-muted);
    }