:root {
      --primary: #173f7a;
      --primary-dark: #0d2d5c;
      --secondary: #2563eb;
      --accent: #f5b301;
      --background: #f4f7fb;
      --card: #ffffff;
      --text: #172033;
      --muted: #64748b;
      --border: #e2e8f0;
      --success: #15803d;
      --shadow: 0 10px 30px rgba(15, 23, 42, .08);
      --radius: 18px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: Arial, Helvetica, sans-serif;
      background: var(--background);
      color: var(--text);
      line-height: 1.6;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    .hero {
      background:
        radial-gradient(circle at 90% 10%, rgba(245,179,1,.18), transparent 28%),
        linear-gradient(135deg, var(--primary-dark), var(--primary));
      color: #fff;
      padding: 28px 20px 70px;
    }

    .container {
      width: min(1150px, 92%);
      margin: auto;
    }

    nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      margin-bottom: 65px;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 13px;
      font-weight: 800;
      letter-spacing: .2px;
    }

    .brand-icon {
      width: 45px;
      height: 45px;
      display: grid;
      place-items: center;
      border-radius: 12px;
      background: rgba(255,255,255,.13);
      border: 1px solid rgba(255,255,255,.2);
      font-size: 22px;
    }

    .menu {
      display: flex;
      gap: 22px;
      font-size: 14px;
    }

    .menu a {
      opacity: .9;
      transition: .2s;
    }

    .menu a:hover {
      opacity: 1;
      color: var(--accent);
    }

    .hero-content {
      max-width: 780px;
    }

    .tag {
      display: inline-block;
      background: rgba(245,179,1,.15);
      color: #ffd35c;
      border: 1px solid rgba(245,179,1,.35);
      padding: 7px 12px;
      border-radius: 999px;
      font-size: 13px;
      font-weight: 700;
      margin-bottom: 18px;
    }

    h1 {
      font-size: clamp(34px, 6vw, 60px);
      line-height: 1.05;
      margin-bottom: 18px;
      letter-spacing: -1.5px;
    }

    .hero p {
      color: #dbeafe;
      font-size: 17px;
      max-width: 700px;
    }

    .professor {
      margin-top: 25px;
      font-weight: 700;
      font-size: 15px;
    }

    main {
      margin-top: -38px;
      padding-bottom: 60px;
    }

    .panel {
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
    }

    .search-panel {
      padding: 22px;
      display: flex;
      gap: 12px;
      align-items: center;
      margin-bottom: 35px;
    }

    .search-panel input {
      width: 100%;
      border: 0;
      outline: 0;
      background: #f8fafc;
      padding: 14px 16px;
      border-radius: 12px;
      font-size: 15px;
      color: var(--text);
    }

    .section-title {
      margin-bottom: 18px;
    }

    .section-title h2 {
      font-size: 28px;
      margin-bottom: 5px;
    }

    .section-title p {
      color: var(--muted);
      font-size: 14px;
    }

    .discipline {
      padding: 25px;
      margin-bottom: 30px;
    }

    .discipline-header {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      gap: 20px;
      margin-bottom: 24px;
    }

    .discipline h3 {
      font-size: 22px;
      color: var(--primary);
    }

    .discipline-info {
      color: var(--muted);
      font-size: 13px;
      margin-top: 5px;
    }

    .badge {
      white-space: nowrap;
      background: #eff6ff;
      color: var(--secondary);
      border: 1px solid #dbeafe;
      border-radius: 999px;
      padding: 6px 10px;
      font-size: 12px;
      font-weight: 700;
    }

    .aulas {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 17px;
    }

    .aula {
      border: 1px solid var(--border);
      border-radius: 15px;
      padding: 19px;
      transition: .2s;
      background: #fff;
    }

    .aula:hover {
      transform: translateY(-3px);
      box-shadow: 0 8px 22px rgba(15,23,42,.08);
      border-color: #bfdbfe;
    }

    .aula-number {
      color: var(--secondary);
      font-size: 12px;
      font-weight: 800;
      text-transform: uppercase;
      margin-bottom: 6px;
    }

    .aula h4 {
      margin-bottom: 8px;
      font-size: 17px;
    }

    .aula p {
      color: var(--muted);
      font-size: 13px;
      min-height: 42px;
      margin-bottom: 15px;
    }

    .buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      border-radius: 9px;
      padding: 9px 12px;
      font-size: 12px;
      font-weight: 700;
      transition: .2s;
    }

    .btn-primary {
      background: var(--primary);
      color: #fff;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
    }

    .btn-light {
      background: #f1f5f9;
      color: #334155;
    }

    .btn-light:hover {
      background: #e2e8f0;
    }

    .resources {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 18px;
      margin-top: 30px;
    }

    .resource {
      padding: 22px;
      border-radius: var(--radius);
      background: #fff;
      border: 1px solid var(--border);
      box-shadow: var(--shadow);
    }

    .resource-icon {
      font-size: 28px;
      margin-bottom: 10px;
    }

    .resource h3 {
      margin-bottom: 6px;
    }

    .resource p {
      color: var(--muted);
      font-size: 13px;
      margin-bottom: 15px;
    }

    .notice {
      margin-top: 30px;
      padding: 20px;
      border-radius: 15px;
      background: #fffbeb;
      border: 1px solid #fde68a;
      color: #713f12;
      font-size: 14px;
    }

    footer {
      background: #0b1f3a;
      color: #cbd5e1;
      text-align: center;
      padding: 30px 20px;
      font-size: 13px;
    }

    footer strong {
      color: #fff;
    }

    .hidden {
      display: none !important;
    }

    @media (max-width: 850px) {
      .aulas,
      .resources {
        grid-template-columns: repeat(2, 1fr);
      }

      .menu {
        display: none;
      }
    }

    @media (max-width: 560px) {
      .hero {
        padding-top: 20px;
        padding-bottom: 60px;
      }

      nav {
        margin-bottom: 45px;
      }

      .aulas,
      .resources {
        grid-template-columns: 1fr;
      }

      .discipline-header {
        flex-direction: column;
      }

      .search-panel {
        padding: 14px;
      }

      h1 {
        font-size: 38px;
      }
    }