/* roulang page: index */
:root {
      --brand: #1d4ed8;
      --brand-dark: #123a9f;
      --brand-soft: #eaf2ff;
      --accent: #0ea5e9;
      --accent-soft: #e0f7ff;
      --ink: #102033;
      --muted: #65748b;
      --weak: #8da0b8;
      --line: #dbe6f3;
      --paper: #ffffff;
      --bg: #f6f9fd;
      --bg-deep: #eef5ff;
      --warning: #f59e0b;
      --success: #10b981;
      --danger: #ef4444;
      --radius-sm: 12px;
      --radius-md: 18px;
      --radius-lg: 28px;
      --shadow-sm: 0 8px 22px rgba(15, 45, 85, .08);
      --shadow-md: 0 18px 45px rgba(23, 64, 124, .12);
      --shadow-lg: 0 30px 80px rgba(20, 58, 112, .18);
      --container: 1180px;
      --nav-h: 76px;
      --ease: all .25s ease;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      font-family: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      color: var(--ink);
      background:
        radial-gradient(circle at 10% 0%, rgba(14, 165, 233, .12), transparent 32%),
        radial-gradient(circle at 88% 12%, rgba(29, 78, 216, .10), transparent 30%),
        var(--bg);
      line-height: 1.72;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--ease);
    }

    a:hover {
      color: var(--brand);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    button,
    input,
    textarea {
      font: inherit;
    }

    button:focus,
    a:focus,
    input:focus,
    textarea:focus {
      outline: 3px solid rgba(14, 165, 233, .25);
      outline-offset: 3px;
    }

    .container {
      max-width: var(--container);
      padding-left: 20px;
      padding-right: 20px;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      backdrop-filter: blur(18px);
      background: rgba(255, 255, 255, .88);
      border-bottom: 1px solid rgba(219, 230, 243, .9);
      box-shadow: 0 12px 30px rgba(15, 45, 85, .06);
    }

    .navbar {
      min-height: var(--nav-h);
      padding: 0;
    }

    .navbar-brand {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      font-weight: 900;
      color: var(--ink);
      letter-spacing: -.02em;
      max-width: 58%;
      white-space: normal;
      line-height: 1.25;
    }

    .brand-mark {
      width: 40px;
      height: 40px;
      border-radius: 14px;
      background: linear-gradient(135deg, var(--brand), var(--accent));
      color: #fff;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 12px 28px rgba(29, 78, 216, .22);
      flex: 0 0 auto;
      font-size: 18px;
      font-weight: 900;
    }

    .navbar-toggler {
      border: 0;
      border-radius: 12px;
      background: var(--brand-soft);
      padding: 10px 12px;
    }

    .navbar-toggler:focus {
      box-shadow: 0 0 0 4px rgba(29, 78, 216, .14);
    }

    .nav-wrap {
      gap: 12px;
    }

    .navbar-nav {
      align-items: center;
      gap: 8px;
    }

    .nav-link {
      color: #31445f;
      font-weight: 700;
      padding: 10px 14px !important;
      border-radius: 999px;
      position: relative;
    }

    .nav-link:hover {
      color: var(--brand);
      background: var(--brand-soft);
    }

    .nav-link.active {
      color: #fff !important;
      background: linear-gradient(135deg, var(--brand), var(--accent));
      box-shadow: 0 10px 24px rgba(29, 78, 216, .22);
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 42px;
      padding: 10px 18px;
      border-radius: 999px;
      color: #fff;
      font-weight: 800;
      background: var(--ink);
      box-shadow: var(--shadow-sm);
      border: 1px solid rgba(255, 255, 255, .2);
    }

    .nav-cta:hover {
      transform: translateY(-2px);
      color: #fff;
      background: var(--brand-dark);
      box-shadow: var(--shadow-md);
    }

    main {
      overflow: hidden;
    }

    section {
      padding: 86px 0;
    }

    .section-kicker {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 12px;
      border-radius: 999px;
      background: var(--brand-soft);
      color: var(--brand-dark);
      font-size: 14px;
      font-weight: 800;
      margin-bottom: 14px;
    }

    .section-kicker::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--accent);
      box-shadow: 0 0 0 5px rgba(14, 165, 233, .14);
    }

    .section-title {
      font-size: clamp(28px, 4vw, 44px);
      line-height: 1.18;
      letter-spacing: -.04em;
      font-weight: 900;
      margin: 0 0 16px;
      color: var(--ink);
    }

    .section-desc {
      color: var(--muted);
      font-size: 17px;
      max-width: 760px;
      margin: 0;
    }

    .hero {
      padding: 54px 0 78px;
    }

    .hero-stage {
      position: relative;
      min-height: 520px;
      border-radius: 36px;
      overflow: hidden;
      background:
        linear-gradient(135deg, rgba(13, 37, 83, .84), rgba(29, 78, 216, .58)),
        url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='1400' height='680' viewBox='0 0 1400 680'%3E%3Cdefs%3E%3ClinearGradient id='g' x1='0' y1='0' x2='1' y2='1'%3E%3Cstop stop-color='%23eaf2ff'/%3E%3Cstop offset='1' stop-color='%23c7ddff'/%3E%3C/linearGradient%3E%3C/defs%3E%3Crect width='1400' height='680' fill='url(/%23g)'/%3E%3Ccircle cx='220' cy='160' r='110' fill='%23ffffff' opacity='.42'/%3E%3Ccircle cx='1080' cy='180' r='170' fill='%239fd9ff' opacity='.35'/%3E%3Cpath d='M0 560 C220 470 330 650 550 550 C780 445 930 515 1160 445 C1280 408 1370 392 1400 384 L1400 680 L0 680Z' fill='%23ffffff' opacity='.58'/%3E%3C/svg%3E");
      background-size: cover;
      background-position: center;
      box-shadow: var(--shadow-lg);
      isolation: isolate;
    }

    .hero-stage::after {
      content: "";
      position: absolute;
      inset: 0;
      background:
        radial-gradient(circle at 78% 20%, rgba(255, 255, 255, .35), transparent 26%),
        linear-gradient(180deg, transparent, rgba(4, 18, 45, .22));
      pointer-events: none;
      z-index: -1;
    }

    .hero-content {
      min-height: 520px;
      display: grid;
      grid-template-columns: minmax(0, 1.05fr) minmax(320px, .75fr);
      gap: 28px;
      align-items: center;
      padding: 56px;
    }

    .hero-copy {
      color: #fff;
      max-width: 720px;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      padding: 9px 14px;
      border-radius: 999px;
      background: rgba(255, 255, 255, .16);
      border: 1px solid rgba(255, 255, 255, .28);
      backdrop-filter: blur(10px);
      font-weight: 800;
      margin-bottom: 18px;
    }

    .hero h1 {
      font-size: clamp(36px, 5.8vw, 68px);
      line-height: 1.06;
      letter-spacing: -.06em;
      font-weight: 950;
      margin: 0 0 22px;
    }

    .hero p {
      max-width: 700px;
      color: rgba(255, 255, 255, .88);
      font-size: 18px;
      margin: 0 0 28px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
      margin-bottom: 28px;
    }

    .btn-main,
    .btn-ghost,
    .btn-soft {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 9px;
      border-radius: 999px;
      min-height: 48px;
      padding: 12px 20px;
      font-weight: 900;
      border: 1px solid transparent;
      transition: var(--ease);
      cursor: pointer;
      white-space: nowrap;
    }

    .btn-main {
      color: #fff;
      background: linear-gradient(135deg, var(--brand), var(--accent));
      box-shadow: 0 16px 32px rgba(29, 78, 216, .24);
    }

    .btn-main:hover {
      color: #fff;
      transform: translateY(-2px);
      box-shadow: 0 22px 42px rgba(29, 78, 216, .32);
    }

    .btn-ghost {
      color: #fff;
      background: rgba(255, 255, 255, .14);
      border-color: rgba(255, 255, 255, .34);
      backdrop-filter: blur(10px);
    }

    .btn-ghost:hover {
      color: #fff;
      background: rgba(255, 255, 255, .23);
      transform: translateY(-2px);
    }

    .btn-soft {
      color: var(--brand-dark);
      background: var(--brand-soft);
      border-color: var(--line);
    }

    .btn-soft:hover {
      color: #fff;
      background: var(--brand);
      border-color: var(--brand);
      transform: translateY(-2px);
    }

    .hero-metrics {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .metric-pill {
      min-width: 138px;
      padding: 14px 16px;
      border-radius: 18px;
      background: rgba(255, 255, 255, .13);
      border: 1px solid rgba(255, 255, 255, .25);
      backdrop-filter: blur(12px);
    }

    .metric-pill strong {
      display: block;
      font-size: 22px;
      line-height: 1.1;
      margin-bottom: 4px;
    }

    .metric-pill span {
      color: rgba(255, 255, 255, .78);
      font-size: 13px;
    }

    .demo-panel {
      background: rgba(255, 255, 255, .92);
      border: 1px solid rgba(255, 255, 255, .55);
      border-radius: 30px;
      padding: 22px;
      box-shadow: 0 24px 60px rgba(6, 24, 55, .22);
      backdrop-filter: blur(18px);
    }

    .demo-top {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 14px;
      padding-bottom: 14px;
      border-bottom: 1px solid var(--line);
      margin-bottom: 16px;
    }

    .demo-title {
      font-weight: 900;
      color: var(--ink);
    }

    .age-chip {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 10px;
      border-radius: 999px;
      color: #92400e;
      background: #fff7ed;
      border: 1px solid #fed7aa;
      font-size: 13px;
      font-weight: 900;
      white-space: nowrap;
    }

    .demo-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      margin-bottom: 16px;
    }

    .demo-card {
      border-radius: 20px;
      padding: 16px;
      min-height: 128px;
      background: linear-gradient(180deg, #ffffff, #f4f8ff);
      border: 1px solid var(--line);
      box-shadow: var(--shadow-sm);
    }

    .demo-icon {
      width: 34px;
      height: 34px;
      border-radius: 12px;
      background: var(--accent-soft);
      color: var(--brand);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      margin-bottom: 12px;
    }

    .demo-card h3 {
      font-size: 16px;
      font-weight: 900;
      margin: 0 0 6px;
    }

    .demo-card p {
      font-size: 13px;
      color: var(--muted);
      margin: 0;
      line-height: 1.55;
    }

    .notice-strip {
      display: flex;
      gap: 10px;
      padding: 14px;
      border-radius: 18px;
      background: #f8fbff;
      border: 1px dashed #bdd2ef;
      color: var(--muted);
      font-size: 14px;
    }

    .band-white {
      background: rgba(255, 255, 255, .72);
    }

    .matrix-layout {
      display: grid;
      grid-template-columns: .75fr 1.25fr;
      gap: 28px;
      align-items: stretch;
      margin-top: 34px;
    }

    .intro-card {
      padding: 28px;
      border-radius: var(--radius-lg);
      background: linear-gradient(180deg, #fff, #f3f8ff);
      border: 1px solid var(--line);
      box-shadow: var(--shadow-md);
    }

    .intro-card .large-num {
      font-size: 64px;
      line-height: 1;
      font-weight: 950;
      letter-spacing: -.06em;
      color: var(--brand);
      margin-bottom: 16px;
    }

    .feature-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 18px;
    }

    .feature-card,
    .content-card,
    .update-card,
    .proof-card,
    .faq-item,
    .category-card {
      background: var(--paper);
      border: 1px solid var(--line);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--ease);
    }

    .feature-card:hover,
    .content-card:hover,
    .update-card:hover,
    .proof-card:hover,
    .category-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: rgba(29, 78, 216, .28);
    }

    .feature-card {
      padding: 24px;
    }

    .card-label {
      display: inline-flex;
      padding: 5px 10px;
      border-radius: 999px;
      background: var(--brand-soft);
      color: var(--brand-dark);
      font-size: 13px;
      font-weight: 900;
      margin-bottom: 12px;
    }

    .feature-card h3,
    .content-card h3,
    .update-card h3,
    .proof-card h3,
    .category-card h3 {
      font-size: 19px;
      margin: 0 0 9px;
      font-weight: 900;
      color: var(--ink);
    }

    .feature-card p,
    .content-card p,
    .update-card p,
    .proof-card p,
    .category-card p {
      margin: 0;
      color: var(--muted);
      font-size: 15px;
    }

    .entry-section {
      background:
        linear-gradient(180deg, rgba(255, 255, 255, .82), rgba(234, 242, 255, .64));
    }

    .entry-stage {
      margin-top: 34px;
      display: grid;
      grid-template-columns: 1.05fr .95fr;
      gap: 22px;
    }

    .entry-main {
      min-height: 340px;
      border-radius: var(--radius-lg);
      padding: 30px;
      background: linear-gradient(135deg, #0f2d55, #1d4ed8);
      color: #fff;
      box-shadow: var(--shadow-lg);
      position: relative;
      overflow: hidden;
    }

    .entry-main::after {
      content: "";
      position: absolute;
      width: 280px;
      height: 280px;
      border-radius: 50%;
      right: -90px;
      bottom: -110px;
      background: rgba(255, 255, 255, .16);
    }

    .entry-main h3 {
      font-size: clamp(26px, 3.8vw, 42px);
      font-weight: 950;
      letter-spacing: -.04em;
      margin: 0 0 12px;
      position: relative;
      z-index: 1;
    }

    .entry-main p {
      color: rgba(255, 255, 255, .82);
      max-width: 600px;
      position: relative;
      z-index: 1;
    }

    .entry-checks {
      display: grid;
      gap: 12px;
      margin-top: 26px;
      position: relative;
      z-index: 1;
    }

    .check-row {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      padding: 13px 14px;
      border-radius: 16px;
      background: rgba(255, 255, 255, .12);
      border: 1px solid rgba(255, 255, 255, .2);
    }

    .check-dot {
      width: 22px;
      height: 22px;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: #fff;
      color: var(--brand);
      font-weight: 950;
      flex: 0 0 auto;
      margin-top: 2px;
    }

    .entry-side {
      display: grid;
      gap: 16px;
    }

    .step-card {
      padding: 22px;
      border-radius: var(--radius-md);
      background: #fff;
      border: 1px solid var(--line);
      box-shadow: var(--shadow-sm);
      display: flex;
      gap: 16px;
      align-items: flex-start;
    }

    .step-num {
      width: 42px;
      height: 42px;
      border-radius: 15px;
      background: var(--brand-soft);
      color: var(--brand);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 950;
      flex: 0 0 auto;
    }

    .step-card h4 {
      font-size: 18px;
      font-weight: 900;
      margin: 0 0 6px;
    }

    .step-card p {
      color: var(--muted);
      margin: 0;
      font-size: 15px;
    }

    .proof-grid {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 18px;
      margin-top: 34px;
    }

    .proof-card {
      padding: 24px;
    }

    .proof-num {
      font-size: 34px;
      font-weight: 950;
      letter-spacing: -.04em;
      color: var(--brand);
      margin-bottom: 8px;
    }

    .category-ribbon {
      margin-top: 34px;
      display: grid;
      grid-template-columns: .9fr 1.1fr;
      gap: 22px;
      align-items: stretch;
    }

    .category-card {
      padding: 28px;
      position: relative;
      overflow: hidden;
    }

    .category-card.primary {
      background: linear-gradient(135deg, #ffffff, #eaf2ff);
    }

    .category-card.primary::after {
      content: "";
      position: absolute;
      width: 190px;
      height: 190px;
      border-radius: 50%;
      right: -70px;
      top: -80px;
      background: rgba(29, 78, 216, .10);
    }

    .topic-list {
      display: grid;
      gap: 12px;
    }

    .topic-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 14px;
      padding: 16px 18px;
      border-radius: 18px;
      background: #fff;
      border: 1px solid var(--line);
      box-shadow: var(--shadow-sm);
    }

    .topic-item span {
      color: var(--muted);
      font-size: 14px;
    }

    .news-layout {
      display: grid;
      grid-template-columns: 1.35fr .65fr;
      gap: 26px;
      margin-top: 34px;
    }

    .news-list {
      background: #fff;
      border: 1px solid var(--line);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-md);
      overflow: hidden;
    }

    .news-row {
      display: grid;
      grid-template-columns: 150px 1fr auto;
      gap: 18px;
      align-items: center;
      padding: 20px 24px;
      border-bottom: 1px solid var(--line);
    }

    .news-row:last-child {
      border-bottom: 0;
    }

    .news-row:hover {
      background: #f8fbff;
    }

    .news-date {
      color: var(--weak);
      font-weight: 800;
      font-size: 14px;
    }

    .news-row a {
      font-weight: 900;
      color: var(--ink);
    }

    .news-row a:hover {
      color: var(--brand);
    }

    .news-tag {
      padding: 5px 10px;
      border-radius: 999px;
      background: var(--accent-soft);
      color: #0369a1;
      font-weight: 900;
      font-size: 13px;
      white-space: nowrap;
    }

    .recommend-box {
      padding: 24px;
      border-radius: var(--radius-lg);
      background: linear-gradient(180deg, #fff, #f4f8ff);
      border: 1px solid var(--line);
      box-shadow: var(--shadow-md);
    }

    .recommend-box h3 {
      font-size: 22px;
      font-weight: 950;
      margin: 0 0 12px;
    }

    .recommend-list {
      display: grid;
      gap: 12px;
      margin-top: 18px;
    }

    .recommend-item {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      padding: 12px;
      border-radius: 16px;
      background: #fff;
      border: 1px solid var(--line);
    }

    .recommend-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: var(--success);
      margin-top: 8px;
      flex: 0 0 auto;
    }

    .recommend-item p {
      margin: 0;
      color: var(--muted);
      font-size: 14px;
    }

    .update-timeline {
      margin-top: 34px;
      display: grid;
      gap: 16px;
    }

    .update-card {
      padding: 22px;
      display: grid;
      grid-template-columns: 150px 1fr 160px;
      gap: 20px;
      align-items: center;
    }

    .update-time {
      font-weight: 950;
      color: var(--brand);
    }

    .update-status {
      justify-self: end;
      padding: 7px 12px;
      border-radius: 999px;
      font-size: 13px;
      font-weight: 900;
      color: #065f46;
      background: #ecfdf5;
      border: 1px solid #a7f3d0;
    }

    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
      margin-top: 34px;
    }

    .faq-item {
      padding: 24px;
    }

    .faq-item h3 {
      font-size: 18px;
      font-weight: 950;
      margin: 0 0 10px;
    }

    .faq-item p {
      color: var(--muted);
      margin: 0;
      font-size: 15px;
    }

    .cta-section {
      padding-bottom: 110px;
    }

    .cta-panel {
      border-radius: 34px;
      padding: 44px;
      background:
        radial-gradient(circle at 82% 28%, rgba(14, 165, 233, .20), transparent 30%),
        linear-gradient(135deg, #0f2d55, #1d4ed8);
      color: #fff;
      box-shadow: var(--shadow-lg);
      display: grid;
      grid-template-columns: 1.1fr .9fr;
      gap: 28px;
      align-items: center;
    }

    .cta-panel h2 {
      font-size: clamp(30px, 4vw, 48px);
      font-weight: 950;
      letter-spacing: -.05em;
      line-height: 1.12;
      margin: 0 0 14px;
    }

    .cta-panel p {
      color: rgba(255, 255, 255, .82);
      margin: 0;
    }

    .cta-box {
      background: rgba(255, 255, 255, .14);
      border: 1px solid rgba(255, 255, 255, .25);
      border-radius: 24px;
      padding: 22px;
      backdrop-filter: blur(14px);
    }

    .cta-box label {
      display: block;
      font-weight: 900;
      margin-bottom: 8px;
    }

    .cta-input {
      width: 100%;
      border: 1px solid rgba(255, 255, 255, .36);
      border-radius: 16px;
      padding: 13px 14px;
      background: rgba(255, 255, 255, .92);
      color: var(--ink);
      margin-bottom: 12px;
    }

    .form-note {
      color: rgba(255, 255, 255, .74);
      font-size: 13px;
      margin-top: 10px;
    }

    .floating-cta {
      position: fixed;
      left: 50%;
      bottom: 18px;
      transform: translateX(-50%);
      z-index: 999;
      width: min(940px, calc(100% - 28px));
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding: 12px 14px 12px 18px;
      border-radius: 999px;
      background: rgba(255, 255, 255, .94);
      border: 1px solid var(--line);
      box-shadow: 0 18px 48px rgba(15, 45, 85, .18);
      backdrop-filter: blur(14px);
    }

    .floating-cta strong {
      font-weight: 950;
      color: var(--ink);
    }

    .floating-cta span {
      color: var(--muted);
      font-size: 14px;
    }

    .floating-cta .btn-main {
      min-height: 42px;
      padding: 9px 16px;
      flex: 0 0 auto;
    }

    .site-footer {
      background: #0b1628;
      color: rgba(255, 255, 255, .78);
      padding: 54px 0 28px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.2fr .8fr;
      gap: 30px;
      align-items: start;
      padding-bottom: 28px;
      border-bottom: 1px solid rgba(255, 255, 255, .12);
    }

    .footer-brand {
      display: flex;
      align-items: center;
      gap: 12px;
      color: #fff;
      font-weight: 950;
      font-size: 20px;
      margin-bottom: 14px;
    }

    .footer-brand .brand-mark {
      box-shadow: none;
    }

    .footer-desc {
      max-width: 680px;
      color: rgba(255, 255, 255, .66);
      margin: 0;
    }

    .footer-links {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: flex-end;
    }

    .footer-links a {
      padding: 9px 12px;
      border-radius: 999px;
      color: rgba(255, 255, 255, .76);
      background: rgba(255, 255, 255, .06);
      border: 1px solid rgba(255, 255, 255, .08);
      font-weight: 800;
    }

    .footer-links a:hover {
      color: #fff;
      background: rgba(255, 255, 255, .12);
    }

    .copyright {
      margin-top: 22px;
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: space-between;
      color: rgba(255, 255, 255, .52);
      font-size: 14px;
    }

    @media (max-width: 1024px) {
      section {
        padding: 72px 0;
      }

      .hero-content,
      .matrix-layout,
      .entry-stage,
      .category-ribbon,
      .news-layout,
      .cta-panel {
        grid-template-columns: 1fr;
      }

      .hero-content {
        padding: 42px;
      }

      .demo-panel {
        max-width: 680px;
      }

      .proof-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .update-card {
        grid-template-columns: 120px 1fr;
      }

      .update-status {
        grid-column: 2;
        justify-self: start;
      }
    }

    @media (max-width: 768px) {
      :root {
        --nav-h: auto;
      }

      .navbar {
        padding: 12px 0;
      }

      .navbar-brand {
        max-width: 76%;
        font-size: 16px;
      }

      .navbar-collapse {
        margin-top: 12px;
        padding: 12px;
        border-radius: 20px;
        background: #fff;
        border: 1px solid var(--line);
        box-shadow: var(--shadow-sm);
      }

      .navbar-nav {
        align-items: stretch;
      }

      .nav-cta {
        width: 100%;
        margin-top: 8px;
      }

      .hero {
        padding-top: 26px;
      }

      .hero-stage {
        border-radius: 26px;
      }

      .hero-content {
        min-height: auto;
        padding: 30px 24px;
      }

      .hero h1 {
        font-size: clamp(32px, 10vw, 48px);
      }

      .hero p {
        font-size: 16px;
      }

      .feature-grid,
      .faq-grid {
        grid-template-columns: 1fr;
      }

      .news-row {
        grid-template-columns: 1fr;
        gap: 8px;
      }

      .news-tag {
        justify-self: start;
      }

      .footer-grid {
        grid-template-columns: 1fr;
      }

      .footer-links {
        justify-content: flex-start;
      }

      .floating-cta {
        border-radius: 22px;
        align-items: flex-start;
        flex-direction: column;
      }

      .floating-cta .btn-main {
        width: 100%;
      }
    }

    @media (max-width: 520px) {
      .container {
        padding-left: 16px;
        padding-right: 16px;
      }

      section {
        padding: 58px 0;
      }

      .hero-stage,
      .cta-panel {
        border-radius: 22px;
      }

      .hero-actions {
        align-items: stretch;
        flex-direction: column;
      }

      .btn-main,
      .btn-ghost,
      .btn-soft {
        width: 100%;
      }

      .hero-metrics {
        display: grid;
        grid-template-columns: 1fr;
      }

      .demo-grid {
        grid-template-columns: 1fr;
      }

      .proof-grid {
        grid-template-columns: 1fr;
      }

      .entry-main,
      .cta-panel {
        padding: 26px 20px;
      }

      .step-card {
        flex-direction: column;
      }

      .update-card {
        grid-template-columns: 1fr;
      }

      .update-status {
        grid-column: auto;
      }

      .copyright {
        flex-direction: column;
      }
    }

/* roulang page: category1 */
:root{
      --bg:#f4f8fd;
      --bg-soft:#edf4fb;
      --card:#ffffff;
      --card-strong:#f8fbff;
      --primary:#1d4ed8;
      --primary-2:#2563eb;
      --primary-deep:#0f3b97;
      --accent:#14b8a6;
      --text:#0f172a;
      --muted:#64748b;
      --light:#94a3b8;
      --border:#dbe4f0;
      --ring:rgba(37,99,235,.18);
      --shadow:0 18px 45px rgba(15,23,42,.08);
      --shadow-sm:0 10px 24px rgba(15,23,42,.06);
      --radius:22px;
      --radius-sm:16px;
      --radius-xs:12px;
      --space:clamp(1rem,2vw,1.5rem);
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      color:var(--text);
      background:
        radial-gradient(circle at 12% 10%, rgba(37,99,235,.08), transparent 28%),
        radial-gradient(circle at 88% 6%, rgba(20,184,166,.10), transparent 24%),
        linear-gradient(180deg, #fbfdff 0%, var(--bg) 100%);
      font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",Arial,sans-serif;
      line-height:1.75;
      -webkit-font-smoothing:antialiased;
      text-rendering:optimizeLegibility;
    }
    a{color:var(--primary);text-decoration:none;transition:all .25s ease}
    a:hover{color:var(--primary-deep)}
    img{max-width:100%;display:block}
    button,input,textarea{font:inherit}
    ::selection{background:rgba(37,99,235,.18);color:var(--text)}
    .container{max-width:1180px}
    .site-header{
      position:sticky;
      top:0;
      z-index:1030;
      background:rgba(255,255,255,.86);
      backdrop-filter:saturate(180%) blur(18px);
      border-bottom:1px solid rgba(219,228,240,.8);
      box-shadow:0 6px 24px rgba(15,23,42,.03);
    }
    .navbar{padding:.95rem 0}
    .navbar-brand{
      display:inline-flex;
      align-items:center;
      gap:.75rem;
      color:var(--text);
      font-weight:800;
      letter-spacing:.01em;
      font-size:1.05rem;
    }
    .navbar-brand:hover{color:var(--primary)}
    .brand-mark{
      width:2.25rem;
      height:2.25rem;
      border-radius:14px;
      display:inline-grid;
      place-items:center;
      color:#fff;
      background:linear-gradient(135deg,var(--primary) 0%,#3b82f6 55%,var(--accent) 100%);
      box-shadow:0 12px 24px rgba(29,78,216,.22);
      font-size:.95rem;
      flex:0 0 auto;
    }
    .navbar-nav{gap:.25rem}
    .nav-wrap{gap:1rem}
    .nav-link{
      color:var(--muted);
      padding:.7rem 1rem !important;
      border-radius:999px;
      font-weight:600;
      transition:all .25s ease;
    }
    .nav-link:hover,.nav-link:focus{
      color:var(--primary);
      background:rgba(37,99,235,.08);
    }
    .nav-link.active{
      color:var(--primary-deep) !important;
      background:rgba(37,99,235,.12);
      box-shadow:inset 0 0 0 1px rgba(37,99,235,.08);
    }
    .nav-cta{
      display:inline-flex;
      align-items:center;
      justify-content:center;
      padding:.82rem 1.2rem;
      border-radius:999px;
      color:#fff;
      background:linear-gradient(135deg,var(--primary) 0%,var(--primary-deep) 100%);
      box-shadow:0 14px 28px rgba(29,78,216,.22);
      font-weight:700;
      white-space:nowrap;
    }
    .nav-cta:hover{transform:translateY(-1px);color:#fff;box-shadow:0 18px 34px rgba(29,78,216,.26)}
    .navbar-toggler{
      border:1px solid rgba(37,99,235,.16);
      border-radius:14px;
      padding:.5rem .7rem;
      box-shadow:none !important;
    }
    .navbar-toggler:focus{box-shadow:0 0 0 .2rem var(--ring)}
    .navbar-toggler-icon{
      background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3E%3Cpath stroke='rgba%2815,23,42,0.84%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2.2' d='M4 7h22M4 15h22M4 23h22'/%3E%3C/svg%3E");
    }
    main{overflow:hidden}
    .hero-section{
      padding:4.2rem 0 2.4rem;
      position:relative;
    }
    .hero-section::before,
    .hero-section::after{
      content:"";
      position:absolute;
      border-radius:999px;
      pointer-events:none;
      filter:blur(12px);
      opacity:.65;
    }
    .hero-section::before{
      width:280px;height:280px;
      right:-90px;top:100px;
      background:rgba(37,99,235,.10);
    }
    .hero-section::after{
      width:180px;height:180px;
      left:-60px;bottom:30px;
      background:rgba(20,184,166,.12);
    }
    .hero-grid{
      display:grid;
      grid-template-columns:minmax(0,1.15fr) minmax(320px,.85fr);
      gap:1.5rem;
      align-items:stretch;
    }
    .hero-copy,.hero-panel,.panel-card,.feature-card,.cta-box,.faq-shell,.showcase-card{
      border:1px solid rgba(219,228,240,.92);
      background:rgba(255,255,255,.88);
      backdrop-filter:blur(8px);
      border-radius:var(--radius);
      box-shadow:var(--shadow);
    }
    .hero-copy{
      padding:clamp(1.5rem,2.8vw,2.5rem);
    }
    .eyebrow{
      display:inline-flex;
      align-items:center;
      gap:.5rem;
      padding:.38rem .85rem;
      border-radius:999px;
      background:rgba(37,99,235,.10);
      color:var(--primary-deep);
      font-size:.88rem;
      font-weight:700;
      letter-spacing:.02em;
      margin-bottom:1rem;
    }
    .eyebrow::before{
      content:"";
      width:.5rem;height:.5rem;border-radius:50%;
      background:var(--accent);
      box-shadow:0 0 0 .35rem rgba(20,184,166,.12);
    }
    .pathline{
      color:var(--light);
      font-size:.95rem;
      margin-bottom:.85rem;
    }
    .hero-copy h1{
      margin:0 0 1rem;
      font-size:clamp(2rem,4vw,3.65rem);
      line-height:1.12;
      letter-spacing:-.03em;
      font-weight:800;
    }
    .hero-copy .lead{
      color:var(--muted);
      font-size:1.06rem;
      margin:0 0 1.3rem;
      max-width:58ch;
    }
    .hero-actions{
      display:flex;
      flex-wrap:wrap;
      gap:.8rem;
      margin:1.2rem 0 1.35rem;
    }
    .btn{
      border-radius:999px;
      padding:.88rem 1.2rem;
      font-weight:700;
      transition:all .25s ease;
      border:1px solid transparent;
    }
    .btn:focus{box-shadow:0 0 0 .22rem var(--ring)}
    .btn-primary{
      background:linear-gradient(135deg,var(--primary) 0%,var(--primary-deep) 100%);
      border-color:transparent;
      box-shadow:0 14px 28px rgba(29,78,216,.20);
    }
    .btn-primary:hover,.btn-primary:active{
      background:linear-gradient(135deg,#1846c1 0%,#0b2f7f 100%);
      transform:translateY(-1px);
    }
    .btn-outline-primary{
      color:var(--primary);
      border-color:rgba(37,99,235,.26);
      background:#fff;
    }
    .btn-outline-primary:hover{
      color:#fff;
      background:var(--primary);
      border-color:var(--primary);
      transform:translateY(-1px);
    }
    .chip-row{
      display:flex;
      flex-wrap:wrap;
      gap:.55rem;
      margin-bottom:1.4rem;
    }
    .chip{
      display:inline-flex;
      align-items:center;
      padding:.42rem .78rem;
      border-radius:999px;
      background:var(--bg-soft);
      color:var(--primary-deep);
      font-size:.88rem;
      font-weight:600;
      border:1px solid rgba(37,99,235,.08);
    }
    .hero-stats{
      display:grid;
      grid-template-columns:repeat(3,minmax(0,1fr));
      gap:.9rem;
      margin-top:1.25rem;
    }
    .stat{
      padding:1rem 1rem .95rem;
      border-radius:18px;
      background:linear-gradient(180deg,#fff 0%,#f8fbff 100%);
      border:1px solid rgba(219,228,240,.9);
      box-shadow:var(--shadow-sm);
    }
    .stat strong{
      display:block;
      font-size:1.35rem;
      color:var(--text);
      line-height:1.1;
      margin-bottom:.25rem;
    }
    .stat span{
      color:var(--muted);
      font-size:.92rem;
    }
    .hero-panel{
      padding:1.4rem;
      background:linear-gradient(180deg,#ffffff 0%,#f8fbff 100%);
      position:relative;
      overflow:hidden;
    }
    .hero-panel::after{
      content:"";
      position:absolute;
      inset:auto -18% -25% auto;
      width:200px;
      height:200px;
      border-radius:50%;
      background:radial-gradient(circle, rgba(37,99,235,.12), transparent 70%);
      pointer-events:none;
    }
    .panel-top{
      display:flex;
      align-items:flex-start;
      justify-content:space-between;
      gap:1rem;
      margin-bottom:1rem;
    }
    .panel-badge{
      display:inline-flex;
      align-items:center;
      padding:.34rem .72rem;
      border-radius:999px;
      background:rgba(20,184,166,.10);
      color:#0f766e;
      font-size:.84rem;
      font-weight:700;
    }
    .panel-title{
      margin:.7rem 0 .3rem;
      font-size:1.28rem;
      line-height:1.35;
      font-weight:800;
    }
    .panel-sub{
      margin:0;
      color:var(--muted);
      font-size:.96rem;
    }
    .check-list{
      list-style:none;
      padding:0;
      margin:1.15rem 0 1.05rem;
      display:grid;
      gap:.82rem;
    }
    .check-list li{
      position:relative;
      padding-left:2rem;
      color:var(--text);
      line-height:1.65;
    }
    .check-list li::before{
      content:"✓";
      position:absolute;
      left:0;
      top:.06rem;
      width:1.35rem;
      height:1.35rem;
      display:grid;
      place-items:center;
      border-radius:50%;
      background:rgba(37,99,235,.10);
      color:var(--primary);
      font-weight:800;
      font-size:.82rem;
    }
    .panel-note{
      padding:.95rem 1rem;
      border-radius:18px;
      border:1px dashed rgba(37,99,235,.18);
      background:rgba(37,99,235,.04);
      color:var(--muted);
      font-size:.93rem;
      position:relative;
      z-index:1;
    }
    .section{
      padding:2rem 0;
      position:relative;
    }
    .section.alt{
      background:linear-gradient(180deg, rgba(237,244,251,.74), rgba(244,248,253,.28));
      border-top:1px solid rgba(219,228,240,.6);
      border-bottom:1px solid rgba(219,228,240,.6);
    }
    .section-header{
      margin-bottom:1.3rem;
      max-width:760px;
    }
    .section-header h2{
      margin:0 0 .6rem;
      font-size:clamp(1.55rem,2.6vw,2.3rem);
      font-weight:800;
      line-height:1.2;
      letter-spacing:-.02em;
    }
    .section-header p{
      margin:0;
      color:var(--muted);
      font-size:1rem;
    }
    .feature-card{
      height:100%;
      padding:1.35rem;
      transition:transform .25s ease, box-shadow .25s ease, border-color .25s ease;
    }
    .feature-card:hover{
      transform:translateY(-4px);
      box-shadow:0 22px 40px rgba(15,23,42,.09);
      border-color:rgba(37,99,235,.20);
    }
    .feature-icon{
      width:3rem;
      height:3rem;
      border-radius:16px;
      display:grid;
      place-items:center;
      background:linear-gradient(135deg, rgba(37,99,235,.12), rgba(20,184,166,.12));
      color:var(--primary-deep);
      font-size:1.15rem;
      font-weight:800;
      margin-bottom:1rem;
    }
    .feature-card h3{
      margin:0 0 .65rem;
      font-size:1.1rem;
      line-height:1.45;
      font-weight:800;
    }
    .feature-card p{
      margin:0;
      color:var(--muted);
    }
    .feature-meta{
      margin-top:1rem;
      color:var(--light);
      font-size:.9rem;
      display:flex;
      align-items:center;
      gap:.4rem;
    }
    .split-wrap{
      display:grid;
      grid-template-columns:minmax(0,1fr) minmax(320px,.95fr);
      gap:1.4rem;
      align-items:start;
    }
    .showcase-card{
      padding:1.35rem;
      height:100%;
    }
    .showcase-card.dark{
      background:linear-gradient(180deg,#0f2f74 0%, #0b2559 100%);
      color:#fff;
      border-color:rgba(255,255,255,.08);
      box-shadow:0 20px 42px rgba(11,37,89,.18);
    }
    .showcase-card.dark p,
    .showcase-card.dark li,
    .showcase-card.dark .mini-note{
      color:rgba(255,255,255,.84);
    }
    .showcase-card h3{
      margin:0 0 .85rem;
      font-size:1.2rem;
      font-weight:800;
      line-height:1.35;
    }
    .compact-list{
      list-style:none;
      padding:0;
      margin:1rem 0 0;
      display:grid;
      gap:.85rem;
    }
    .compact-list li{
      display:flex;
      gap:.75rem;
      align-items:flex-start;
      color:var(--text);
    }
    .compact-list .dot{
      width:1.15rem;
      height:1.15rem;
      border-radius:50%;
      flex:0 0 auto;
      margin-top:.34rem;
      background:linear-gradient(135deg,var(--primary) 0%,var(--accent) 100%);
      box-shadow:0 0 0 .35rem rgba(37,99,235,.08);
    }
    .tip-grid{
      display:grid;
      grid-template-columns:repeat(3,minmax(0,1fr));
      gap:1rem;
      margin-top:1rem;
    }
    .tip-card{
      padding:1rem;
      border-radius:18px;
      background:rgba(255,255,255,.08);
      border:1px solid rgba(255,255,255,.14);
    }
    .tip-card strong{
      display:block;
      margin-bottom:.35rem;
      font-size:1rem;
    }
    .tip-card span{
      color:rgba(255,255,255,.78);
      font-size:.92rem;
      line-height:1.55;
    }
    .scene-grid{
      display:grid;
      grid-template-columns:repeat(3,minmax(0,1fr));
      gap:1rem;
      margin-top:1rem;
    }
    .scene-item{
      padding:1rem;
      border-radius:18px;
      background:linear-gradient(180deg,#fff 0%,#f8fbff 100%);
      border:1px solid rgba(219,228,240,.92);
      box-shadow:var(--shadow-sm);
    }
    .scene-item strong{
      display:block;
      margin-bottom:.35rem;
      color:var(--primary-deep);
      font-size:1rem;
    }
    .scene-item p{
      margin:0;
      color:var(--muted);
      font-size:.92rem;
    }
    .mini-stats{
      display:grid;
      grid-template-columns:repeat(3,minmax(0,1fr));
      gap:.8rem;
      margin-top:1rem;
    }
    .mini-stat{
      padding:.95rem;
      border-radius:16px;
      background:#fff;
      border:1px solid rgba(219,228,240,.9);
      text-align:center;
    }
    .mini-stat strong{
      display:block;
      color:var(--primary-deep);
      font-size:1.1rem;
      margin-bottom:.15rem;
    }
    .mini-stat span{
      color:var(--muted);
      font-size:.88rem;
    }
    .faq-shell{
      padding:1.2rem;
    }
    .accordion{
      --bs-accordion-border-color:rgba(219,228,240,.9);
      --bs-accordion-active-bg:#f8fbff;
      --bs-accordion-btn-focus-border-color:transparent;
      --bs-accordion-btn-focus-box-shadow:0 0 0 .22rem var(--ring);
      --bs-accordion-btn-padding-y:1.05rem;
      --bs-accordion-btn-padding-x:1.1rem;
      --bs-accordion-body-padding-x:1.1rem;
      --bs-accordion-body-padding-y:.2rem 1.1rem 1.05rem;
    }
    .accordion-item{
      border-radius:18px !important;
      overflow:hidden;
      border:1px solid rgba(219,228,240,.9);
      box-shadow:var(--shadow-sm);
      margin-bottom:.9rem;
      background:#fff;
    }
    .accordion-button{
      font-weight:700;
      color:var(--text);
      background:#fff;
      box-shadow:none !important;
    }
    .accordion-button:not(.collapsed){
      color:var(--primary-deep);
      background:linear-gradient(180deg,#fff 0%,#f8fbff 100%);
    }
    .accordion-button::after{
      background-size:1rem;
      opacity:.72;
    }
    .accordion-body{
      color:var(--muted);
      line-height:1.72;
    }
    .cta-box{
      padding:1.6rem;
      background:
        radial-gradient(circle at 90% 20%, rgba(255,255,255,.14), transparent 22%),
        linear-gradient(135deg,#123a8c 0%,#1d4ed8 50%,#2563eb 100%);
      color:#fff;
      display:grid;
      grid-template-columns:minmax(0,1.1fr) minmax(320px,.9fr);
      gap:1.2rem;
      align-items:center;
    }
    .cta-box .eyebrow{
      background:rgba(255,255,255,.14);
      color:#fff;
    }
    .cta-box .eyebrow::before{background:#7dd3fc;box-shadow:0 0 0 .35rem rgba(255,255,255,.08)}
    .cta-box h2{
      margin:0 0 .7rem;
      font-size:clamp(1.5rem,2.5vw,2.2rem);
      font-weight:800;
      line-height:1.25;
    }
    .cta-box p{
      margin:0;
      color:rgba(255,255,255,.88);
      max-width:62ch;
    }
    .cta-form{
      padding:1rem;
      border-radius:20px;
      background:rgba(255,255,255,.12);
      border:1px solid rgba(255,255,255,.16);
      backdrop-filter:blur(10px);
    }
    .form-check{
      margin-bottom:1rem;
      padding-left:1.8rem;
    }
    .form-check-label{
      color:#fff;
      font-weight:600;
    }
    .form-check-input{
      margin-top:.35rem;
      border-color:rgba(255,255,255,.42);
      background-color:rgba(255,255,255,.08);
      box-shadow:none !important;
    }
    .form-check-input:checked{
      background-color:#fff;
      border-color:#fff;
    }
    .form-check-input:focus{
      box-shadow:0 0 0 .22rem rgba(255,255,255,.22);
    }
    .cta-actions{
      display:flex;
      flex-wrap:wrap;
      gap:.75rem;
      margin-top:.95rem;
    }
    .btn-light{
      background:#fff;
      color:var(--primary-deep);
      border-color:#fff;
      font-weight:700;
    }
    .btn-light:hover{
      background:rgba(255,255,255,.94);
      color:var(--primary-deep);
      transform:translateY(-1px);
    }
    .form-note{
      display:block;
      margin-top:.9rem;
      color:rgba(255,255,255,.78);
      font-size:.88rem;
    }
    .site-footer{
      margin-top:2rem;
      background:#0f172a;
      color:rgba(255,255,255,.82);
      padding:2rem 0 1.15rem;
    }
    .footer-grid{
      display:grid;
      grid-template-columns:minmax(0,1.1fr) minmax(220px,.9fr);
      gap:1.3rem;
      align-items:flex-start;
    }
    .footer-brand{
      display:inline-flex;
      align-items:center;
      gap:.75rem;
      font-weight:800;
      color:#fff;
      margin-bottom:.85rem;
      font-size:1.05rem;
    }
    .footer-brand .brand-mark{box-shadow:none}
    .footer-desc{
      margin:0;
      color:rgba(255,255,255,.72);
      max-width:62ch;
    }
    .footer-links{
      display:flex;
      flex-wrap:wrap;
      gap:.65rem 1rem;
      justify-content:flex-end;
    }
    .footer-links a{
      color:rgba(255,255,255,.84);
      padding:.35rem 0;
    }
    .footer-links a:hover{color:#fff}
    .copyright{
      display:flex;
      flex-wrap:wrap;
      justify-content:space-between;
      gap:.75rem 1rem;
      margin-top:1.35rem;
      padding-top:1rem;
      border-top:1px solid rgba(255,255,255,.12);
      color:rgba(255,255,255,.64);
      font-size:.92rem;
    }
    .reveal-band{
      padding:1rem;
      border-radius:20px;
      border:1px solid rgba(219,228,240,.9);
      background:linear-gradient(180deg,#fff 0%,#f8fbff 100%);
      box-shadow:var(--shadow-sm);
    }
    .reveal-band p{margin:0;color:var(--muted)}
    .focus-outline:focus-visible{outline:0;box-shadow:0 0 0 .22rem var(--ring)}
    @media (max-width: 991.98px){
      .hero-grid,
      .split-wrap,
      .cta-box,
      .footer-grid{
        grid-template-columns:1fr;
      }
      .nav-wrap{
        margin-top:1rem;
        padding:1rem;
        border-radius:20px;
        background:#fff;
        border:1px solid rgba(219,228,240,.9);
        box-shadow:var(--shadow-sm);
      }
      .nav-cta{display:inline-flex;width:100%;justify-content:center}
      .hero-section{padding-top:3.2rem}
      .tip-grid,
      .scene-grid,
      .hero-stats,
      .mini-stats{
        grid-template-columns:repeat(2,minmax(0,1fr));
      }
      .footer-links{justify-content:flex-start}
    }
    @media (max-width: 767.98px){
      .hero-copy,.hero-panel,.feature-card,.showcase-card,.faq-shell,.cta-box,.reveal-band{
        padding:1.1rem;
      }
      .section{padding:1.5rem 0}
      .hero-stats,
      .tip-grid,
      .scene-grid,
      .mini-stats{
        grid-template-columns:1fr;
      }
      .hero-actions{gap:.65rem}
      .btn{width:100%;justify-content:center}
      .nav-link{padding:.75rem .9rem !important}
      .copyright{flex-direction:column}
    }
    @media (max-width: 519.98px){
      .hero-copy h1{font-size:1.9rem}
      .panel-title{font-size:1.14rem}
      .section-header h2{font-size:1.4rem}
      .nav-wrap{padding:.85rem}
      .brand-mark{width:2rem;height:2rem;border-radius:12px}
    }