/* ===== Reset & Base ===== */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Noto Sans SC", sans-serif;
      background: #f7faf5;
      color: #1f2e33;
      line-height: 1.6;
    }
    img { max-width: 100%; height: auto; display: block; }
    a { text-decoration: none; color: inherit; }

    /* ===== Colors ===== */
    :root {
      --bg: #f7faf5;
      --surface: #ffffff;
      --teal: #339e91;
      --teal-dark: #278075;
      --teal-light: rgba(51, 158, 145, 0.08);
      --ink: #1f2e33;
      --secondary: #6b7d84;
      --border: #e0e8e3;
      --green: #4d945c;
      --blue: #4080d1;
      --coral: #e98a6b;
      --gold: #e0b847;
      --indigo: #756bbd;
      --rose: #d15766;
    }

    /* ===== Typography ===== */
    h1, h2, h3 { line-height: 1.25; font-weight: 700; }
    h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
    h2 { font-size: clamp(1.5rem, 3.5vw, 2.2rem); text-align: center; margin-bottom: 0.5rem; }
    h3 { font-size: 1.2rem; }
    p  { color: var(--secondary); }
    .section-subtitle { text-align: center; color: var(--secondary); font-size: 1.05rem; max-width: 540px; margin: 0 auto 3rem; }

    /* ===== Container ===== */
    .container { max-width: 1100px; margin: 0 auto; padding: 0 1.5rem; }

    /* ===== Navigation ===== */
    nav {
      position: fixed; top: 0; width: 100%; z-index: 100;
      background: rgba(247, 250, 245, 0.85);
      backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
    }
    nav .container {
      display: flex; align-items: center; justify-content: space-between;
      height: 60px;
    }
    .nav-logo {
      display: flex; align-items: center; gap: 0.5rem;
      font-size: 1.15rem; font-weight: 700; color: var(--teal);
    }
    .nav-logo span { font-size: 1.4rem; }
    .nav-links { display: flex; align-items: center; gap: 2rem; list-style: none; }
    .nav-links a {
      font-size: 0.9rem; font-weight: 500; color: var(--secondary);
      transition: color 0.2s;
    }
    .nav-links a:hover { color: var(--teal); }
    .nav-cta {
      display: inline-flex; align-items: center; gap: 0.4rem;
      background: var(--teal); color: #fff !important; padding: 0.5rem 1.1rem;
      border-radius: 100px; font-size: 0.85rem; font-weight: 600;
      transition: background 0.2s, transform 0.15s;
    }
    .nav-cta:hover { background: var(--teal-dark); transform: translateY(-1px); }

    /* Mobile nav toggle */
    .nav-toggle { display: none; flex-direction: column; gap: 4px; cursor: pointer; background: none; border: none; padding: 4px; }
    .nav-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); border-radius: 2px; transition: 0.3s; }

    /* ===== Sections ===== */
    section { padding: 5rem 0; }

    /* ===== Hero ===== */
    .hero {
      padding: 8rem 0 5rem;
      background: linear-gradient(180deg, rgba(51, 158, 145, 0.06) 0%, transparent 80%);
    }
    .hero .container {
      display: flex; align-items: center; gap: 4rem;
    }
    .hero-text { flex: 1.2; }
    .hero-text h1 {
      margin-bottom: 1rem;
      background: linear-gradient(135deg, var(--ink) 0%, var(--teal-dark) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-text p {
      font-size: 1.15rem; margin-bottom: 2rem; max-width: 480px;
    }
    .hero-ctas { display: flex; gap: 1rem; flex-wrap: wrap; }
    .btn-primary {
      display: inline-flex; align-items: center; gap: 0.5rem;
      background: var(--teal); color: #fff; padding: 0.85rem 1.8rem;
      border-radius: 100px; font-size: 0.95rem; font-weight: 600;
      transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
      box-shadow: 0 4px 14px rgba(51, 158, 145, 0.3);
    }
    .btn-primary:hover { background: var(--teal-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(51, 158, 145, 0.35); }
    .btn-secondary {
      display: inline-flex; align-items: center; gap: 0.5rem;
      background: var(--surface); color: var(--ink); padding: 0.85rem 1.8rem;
      border-radius: 100px; font-size: 0.95rem; font-weight: 600;
      border: 1px solid var(--border);
      transition: border-color 0.2s, transform 0.15s;
    }
    .btn-secondary:hover { border-color: var(--teal); transform: translateY(-2px); }
    .hero-visual { flex: 1; display: flex; justify-content: center; position: relative; }
    .hero-phone-frame {
      width: 260px; height: 520px;
      background: var(--surface);
      border-radius: 36px;
      border: 4px solid #d5e0d9;
      box-shadow: 0 20px 60px rgba(0,0,0,0.08), 0 8px 24px rgba(51, 158, 145, 0.10);
      overflow: hidden;
      display: flex; flex-direction: column;
      position: relative;
    }
    .hero-phone-frame .phone-notch {
      height: 28px; background: var(--surface); border-radius: 0 0 16px 16px;
      display: flex; justify-content: center; align-items: center;
      position: relative;
    }
    .hero-phone-frame .phone-notch span { width: 120px; height: 6px; background: #ddd; border-radius: 3px; }
    .phone-screen {
      flex: 1; padding: 1.2rem 0.8rem; overflow: hidden;
      display: flex; flex-direction: column; gap: 0.65rem;
    }
    .phone-header {
      text-align: center; font-size: 0.8rem; font-weight: 600; color: var(--ink);
      padding-bottom: 0.5rem; border-bottom: 1px solid var(--border);
    }
    .phone-record {
      display: flex; align-items: center; gap: 0.6rem;
      padding: 0.55rem 0.65rem;
      background: var(--bg); border-radius: 10px;
      border-left: 3px solid;
      font-size: 0.8rem;
    }
    .phone-record .icon { font-size: 1.1rem; }
    .phone-record .label { font-weight: 600; color: var(--ink); }
    .phone-record .value { color: var(--secondary); margin-left: auto; font-size: 0.75rem; }
    .phone-record:nth-child(2) { border-left-color: var(--teal); }
    .phone-record:nth-child(3) { border-left-color: var(--indigo); }
    .phone-record:nth-child(4) { border-left-color: var(--gold); }
    .phone-record:nth-child(5) { border-left-color: var(--green); }
    .phone-record:nth-child(6) { border-left-color: var(--coral); }
    .phone-record:nth-child(7) { border-left-color: var(--rose); }
    .phone-float-stats {
      position: absolute; top: 20%; right: -40px;
      background: var(--surface); border-radius: 12px;
      padding: 0.7rem 0.9rem; box-shadow: 0 4px 20px rgba(0,0,0,0.08);
      border: 1px solid var(--border);
      font-size: 0.75rem; text-align: center;
    }
    .phone-float-stats .num { font-size: 1.2rem; font-weight: 700; color: var(--teal); }

    /* ===== Stats Bar ===== */
    .stats-bar {
      background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
      padding: 2.5rem 0;
    }
    .stats-bar .container {
      display: flex; justify-content: space-around; flex-wrap: wrap; gap: 1.5rem;
    }
    .stat-item { text-align: center; }
    .stat-item .num { font-size: 1.8rem; font-weight: 700; color: var(--teal); }
    .stat-item .label { font-size: 0.85rem; color: var(--secondary); margin-top: 0.2rem; }

    /* ===== Features Grid ===== */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
      gap: 1.2rem;
    }
    .feature-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 14px;
      padding: 1.5rem 1.2rem;
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .feature-card:hover { transform: translateY(-3px); box-shadow: 0 8px 28px rgba(0,0,0,0.05); }
    .feature-card .icon { font-size: 1.6rem; margin-bottom: 0.5rem; }
    .feature-card h3 { font-size: 1rem; margin-bottom: 0.3rem; }
    .feature-card p { font-size: 0.85rem; }

    /* ===== How It Works ===== */
    .steps { background: var(--surface); }
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .step { text-align: center; }
    .step-num {
      display: inline-flex; align-items: center; justify-content: center;
      width: 48px; height: 48px; border-radius: 50%;
      background: var(--teal-light); color: var(--teal);
      font-size: 1.2rem; font-weight: 700; margin-bottom: 1rem;
    }
    .step h3 { margin-bottom: 0.4rem; }
    .step p { font-size: 0.9rem; max-width: 280px; margin: 0 auto; }

    /* ===== Values / Built With Care ===== */
    .values-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .value-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 14px;
      padding: 2rem 1.5rem;
      text-align: center;
    }
    .value-card .icon { font-size: 2rem; margin-bottom: 0.8rem; }
    .value-card h3 { margin-bottom: 0.5rem; }
    .value-card p { font-size: 0.9rem; }

    /* ===== CTA Banner ===== */
    .cta-banner {
      background: linear-gradient(135deg, var(--teal) 0%, #3fb5a7 100%);
      color: #fff; text-align: center; padding: 4rem 0;
      border-radius: 20px; margin: 0 1.5rem;
    }
    .cta-banner h2 { color: #fff; margin-bottom: 0.8rem; }
    .cta-banner p { color: rgba(255,255,255,0.85); margin-bottom: 2rem; font-size: 1.05rem; }
    .cta-banner .btn-primary {
      background: #fff; color: var(--teal); box-shadow: 0 4px 14px rgba(0,0,0,0.15);
    }
    .cta-banner .btn-primary:hover { background: #f0faf8; }

    /* ===== Support Center ===== */
    section[id] { scroll-margin-top: 84px; }
    .support-section { background: linear-gradient(180deg, #eef8f5 0%, var(--bg) 100%); }
    .support-grid {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 1rem;
    }
    .support-card {
      display: block; background: var(--surface); border: 1px solid var(--border);
      border-radius: 16px; padding: 1.25rem; transition: transform 0.2s, box-shadow 0.2s;
    }
    .support-card:hover { transform: translateY(-3px); box-shadow: 0 8px 28px rgba(0,0,0,0.06); }
    .support-card .icon { font-size: 1.6rem; margin-bottom: 0.65rem; }
    .support-card h3 { font-size: 1rem; margin-bottom: 0.35rem; }
    .support-card p { font-size: 0.85rem; }
    .support-card .arrow { display: block; color: var(--teal); margin-top: 0.8rem; font-size: 0.85rem; font-weight: 600; }
    .support-content { max-width: 860px; margin: 0 auto; }
    .support-content > h2 { text-align: left; }
    .support-content > .section-subtitle { text-align: left; margin-left: 0; margin-bottom: 1.75rem; }
    .search-wrap { position: relative; margin-bottom: 1rem; }
    .search-wrap input { padding-left: 2.8rem; }
    .search-wrap .search-icon { position: absolute; top: 50%; left: 1rem; transform: translateY(-50%); color: var(--secondary); }
    .faq-list { display: grid; gap: 0.7rem; }
    .faq-item { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 0 1.1rem; }
    .faq-item[hidden] { display: none; }
    .faq-item summary { cursor: pointer; list-style: none; padding: 1rem 2rem 1rem 0; font-weight: 600; position: relative; }
    .faq-item summary::-webkit-details-marker { display: none; }
    .faq-item summary::after { content: '+'; position: absolute; right: 0; color: var(--teal); font-size: 1.25rem; font-weight: 400; }
    .faq-item[open] summary::after { content: '−'; }
    .faq-item p { padding: 0 0 1rem; font-size: 0.92rem; }
    .faq-empty { display: none; padding: 1.25rem; color: var(--secondary); background: var(--surface); border: 1px dashed var(--border); border-radius: 12px; }
    .faq-empty.visible { display: block; }
    .feedback-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 1.25rem; align-items: start; }
    .feedback-form, .contact-card, .changelog-list, .policy-card {
      background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 1.5rem;
    }
    .form-field { display: grid; gap: 0.4rem; margin-bottom: 1rem; }
    .form-field label { font-size: 0.88rem; font-weight: 600; color: var(--ink); }
    .form-field small { color: var(--secondary); font-size: 0.78rem; }
    input, select, textarea {
      width: 100%; border: 1px solid var(--border); border-radius: 10px; background: #fbfdfb;
      color: var(--ink); font: inherit; padding: 0.75rem 0.85rem; outline: none; transition: border-color 0.2s, box-shadow 0.2s;
    }
    input:focus, select:focus, textarea:focus { border-color: var(--teal); box-shadow: 0 0 0 3px var(--teal-light); }
    textarea { min-height: 140px; resize: vertical; }
    .form-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem; }
    .form-actions .btn-primary { border: 0; cursor: pointer; font: inherit; }
    .form-note { font-size: 0.8rem; color: var(--secondary); }
    .form-status { min-height: 1.25rem; margin-top: 0.8rem; color: var(--teal-dark); font-size: 0.85rem; }
    .contact-card h3 { margin-bottom: 0.45rem; }
    .contact-card p { font-size: 0.9rem; margin-bottom: 1.1rem; }
    .contact-email { display: inline-flex; align-items: center; gap: 0.45rem; color: var(--teal-dark); font-weight: 700; word-break: break-all; }
    .contact-list { list-style: none; margin-top: 1.35rem; border-top: 1px solid var(--border); padding-top: 1rem; }
    .contact-list li { display: flex; gap: 0.55rem; color: var(--secondary); font-size: 0.86rem; margin-bottom: 0.55rem; }
    .changelog-list { display: grid; gap: 1.2rem; }
    .changelog-item { padding-bottom: 1.2rem; border-bottom: 1px solid var(--border); }
    .changelog-item:last-child { padding-bottom: 0; border-bottom: 0; }
    .changelog-meta { color: var(--teal-dark); font-size: 0.8rem; font-weight: 700; margin-bottom: 0.3rem; }
    .changelog-item h3 { font-size: 1rem; margin-bottom: 0.3rem; }
    .changelog-item p { font-size: 0.9rem; }
    .policy-card { max-width: 860px; margin: 0 auto; }
    .policy-card h2 { text-align: left; margin-bottom: 0.35rem; }
    .policy-updated { color: var(--secondary); font-size: 0.82rem; margin-bottom: 1.4rem; }
    .policy-card h3 { font-size: 1rem; margin: 1.25rem 0 0.35rem; }
    .policy-card p, .policy-card li { color: var(--secondary); font-size: 0.9rem; }
    .policy-card ul { padding-left: 1.2rem; }
    .policy-card li { margin-bottom: 0.35rem; }
    .medical-note { margin-top: 1.25rem; padding: 0.9rem 1rem; border-radius: 10px; background: #fff8e8; color: #765b25; font-size: 0.86rem; }
    .inline-link { color: var(--teal-dark); text-decoration: underline; text-underline-offset: 2px; }
    .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

    /* ===== Footer ===== */
    footer {
      border-top: 1px solid var(--border);
      padding: 3rem 0 2rem;
      margin-top: 3rem;
    }
    footer .container {
      display: flex; flex-wrap: wrap; justify-content: space-between; gap: 2rem;
    }
    .footer-brand { max-width: 280px; }
    .footer-brand .logo { font-size: 1.1rem; font-weight: 700; color: var(--teal); margin-bottom: 0.5rem; }
    .footer-brand p { font-size: 0.85rem; }
    .footer-links { display: flex; gap: 3rem; flex-wrap: wrap; }
    .footer-links h4 { font-size: 0.85rem; margin-bottom: 0.8rem; color: var(--ink); }
    .footer-links ul { list-style: none; }
    .footer-links li { margin-bottom: 0.4rem; }
    .footer-links a { font-size: 0.85rem; color: var(--secondary); transition: color 0.2s; }
    .footer-links a:hover { color: var(--teal); }
    .footer-bottom {
      text-align: center; padding-top: 2rem; margin-top: 2rem;
      border-top: 1px solid var(--border);
      font-size: 0.8rem; color: var(--secondary);
    }

    /* ===== Animations ===== */
    .fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease, transform 0.6s ease; }
    .fade-in.visible { opacity: 1; transform: translateY(0); }

    /* ===== Responsive ===== */
    @media (max-width: 860px) {
      .hero .container { flex-direction: column; text-align: center; gap: 2.5rem; }
      .hero-text p { margin: 0 auto 2rem; }
      .hero-ctas { justify-content: center; }
      .hero-phone-frame { width: 220px; height: 440px; }
      .phone-float-stats { right: -20px; }
      .phone-record { font-size: 0.72rem; padding: 0.45rem 0.55rem; }
      .phone-header { font-size: 0.7rem; }
      .steps-grid, .values-grid { grid-template-columns: 1fr; }
      .footer-links { gap: 1.5rem; }
      .support-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
      .feedback-grid { grid-template-columns: 1fr; }
    }

    @media (max-width: 600px) {
      .nav-links { display: none; flex-direction: column; position: fixed; top: 60px; left: 0; right: 0; background: rgba(247, 250, 245, 0.98); border-bottom: 1px solid var(--border); padding: 1rem 1.5rem; gap: 1rem; align-items: flex-start; }
      .nav-links.open { display: flex; }
      .nav-toggle { display: flex; }
      .features-grid { grid-template-columns: 1fr 1fr; }
      .cta-banner { margin: 0 0.8rem; border-radius: 12px; }
      .phone-float-stats { display: none; }
      .support-grid { grid-template-columns: 1fr 1fr; gap: 0.7rem; }
      .support-card { padding: 1rem; }
    }

    /* ===== Language switcher ===== */
    .language-switcher { display: inline-flex; align-items: center; gap: 0.35rem; margin-left: 0.5rem; }
    .language-switcher a { font-size: 0.82rem; color: var(--secondary); }
    .language-switcher a.active { color: var(--teal-dark); font-weight: 700; }
    .language-switcher span { color: var(--border); }

    @media (max-width: 600px) {
      .language-switcher { margin-left: 0; }
    }

    /* ===== Standalone content pages ===== */
    .page-main { padding-top: 60px; }
    .page-hero {
      padding: 5rem 0 3rem;
      background: linear-gradient(180deg, rgba(51, 158, 145, 0.08) 0%, transparent 100%);
    }
    .page-hero .container { max-width: 860px; }
    .page-eyebrow { color: var(--teal-dark); font-size: 0.85rem; font-weight: 700; margin-bottom: 0.6rem; }
    .page-hero h1 { font-size: clamp(2rem, 5vw, 3rem); margin-bottom: 0.85rem; }
    .page-hero p { max-width: 660px; font-size: 1.05rem; }
    .page-section { padding: 2rem 0 5rem; }
    .page-section .container { max-width: 960px; }
    .page-section .features-grid,
    .page-section .steps-grid,
    .page-section .values-grid { margin-top: 0; }
    .page-section .support-grid { margin-top: 0; }
    .page-section .support-content { max-width: 860px; }
    .page-section .support-content > h2,
    .page-section .support-content > .section-subtitle { display: none; }
    .page-section > .container > h2,
    .page-section > .container > .section-subtitle { display: none; }
    .contact-page-card { max-width: 680px; margin: 0 auto; }
    .contact-page-card .contact-card { min-height: 260px; }
    .page-home-cta { padding-top: 2rem; }