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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: Arial, Helvetica, sans-serif;
            background: #f4f7fb;
            color: #172033;
            line-height: 1.6;
        }

        a {
            text-decoration: none;
        }

        /* =========================
           CABEÇALHO
        ========================= */

        header {
            background:
                radial-gradient(circle at 85% 15%, rgba(56,189,248,0.20), transparent 30%),
                linear-gradient(135deg, #0f172a, #1e3a8a);

            color: white;
            padding: 25px 20px 80px;
        }

        .container {
            width: 92%;
            max-width: 1150px;
            margin: auto;
        }

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

        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
            font-weight: bold;
            font-size: 16px;
        }

        .logo-icon {
            width: 45px;
            height: 45px;
            border-radius: 12px;
            background: rgba(255,255,255,0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
        }

        .menu {
            display: flex;
            gap: 25px;
        }

        .menu a {
            color: white;
            font-size: 14px;
            transition: 0.2s;
        }

        .menu a:hover {
            color: #38bdf8;
        }

        .tag {
            display: inline-block;
            padding: 7px 13px;
            border-radius: 50px;
            background: rgba(56,189,248,0.12);
            border: 1px solid rgba(56,189,248,0.35);
            color: #bae6fd;
            font-size: 12px;
            font-weight: bold;
            margin-bottom: 18px;
        }

        h1 {
            font-size: clamp(35px, 6vw, 60px);
            line-height: 1.05;
            margin-bottom: 20px;
        }

        .descricao {
            max-width: 750px;
            color: #dbeafe;
            font-size: 17px;
        }

        .professor {
            margin-top: 25px;
            font-weight: bold;
        }

        /* =========================
           CONTEÚDO
        ========================= */

        main {
            margin-top: -40px;
            padding-bottom: 60px;
        }

        .painel {
            background: white;
            border: 1px solid #e2e8f0;
            border-radius: 18px;
            box-shadow: 0 10px 30px rgba(15,23,42,0.08);
        }

        /* =========================
           PESQUISA
        ========================= */

        .pesquisa {
            padding: 18px;
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 35px;
        }

        .pesquisa input {
            width: 100%;
            border: none;
            outline: none;
            background: #f8fafc;
            padding: 14px;
            border-radius: 10px;
            font-size: 15px;
        }

        /* =========================
           TÍTULOS
        ========================= */

        .titulo-secao {
            margin-bottom: 18px;
        }

        .titulo-secao h2 {
            font-size: 28px;
            margin-bottom: 5px;
        }

        .titulo-secao p {
            color: #64748b;
            font-size: 14px;
        }

        /* =========================
           DISCIPLINA
        ========================= */

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

        .cabecalho-disciplina {
            display: flex;
            justify-content: space-between;
            gap: 20px;
            margin-bottom: 25px;
        }

        .cabecalho-disciplina h3 {
            color: #1e3a8a;
            font-size: 22px;
        }

        .informacao-disciplina {
            color: #64748b;
            font-size: 13px;
            margin-top: 5px;
        }

        .ano {
            height: fit-content;
            padding: 6px 11px;
            border-radius: 50px;
            background: #eff6ff;
            color: #1e3a8a;
            border: 1px solid #dbeafe;
            font-size: 12px;
            font-weight: bold;
        }

        /* =========================
           AULAS
        ========================= */

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

        .aula {
            border: 1px solid #e2e8f0;
            border-radius: 15px;
            padding: 20px;
            background: white;
            transition: 0.2s;
        }

        .aula:hover {
            transform: translateY(-4px);
            border-color: #bae6fd;
            box-shadow: 0 8px 22px rgba(15,23,42,0.08);
        }

        .numero-aula {
            color: #0284c7;
            font-size: 12px;
            font-weight: bold;
            text-transform: uppercase;
            margin-bottom: 6px;
        }

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

        .aula p {
            color: #64748b;
            font-size: 13px;
            min-height: 45px;
            margin-bottom: 15px;
        }

        /* =========================
           BOTÕES
        ========================= */

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

        .botao {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 5px;
            padding: 9px 12px;
            border-radius: 9px;
            font-size: 12px;
            font-weight: bold;
            transition: 0.2s;
        }

        .botao-principal {
            background: #1e3a8a;
            color: white;
        }

        .botao-principal:hover {
            background: #172554;
        }

        .botao-secundario {
            background: #f1f5f9;
            color: #334155;
        }

        .botao-secundario:hover {
            background: #e2e8f0;
        }

        /* =========================
           MATERIAIS
        ========================= */

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

        .material {
            background: white;
            border: 1px solid #e2e8f0;
            border-radius: 18px;
            padding: 22px;
            box-shadow: 0 10px 30px rgba(15,23,42,0.08);
        }

        .icone-material {
            font-size: 28px;
            margin-bottom: 10px;
        }

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

        .material p {
            color: #64748b;
            font-size: 13px;
            margin-bottom: 15px;
        }

        /* =========================
           AVISO
        ========================= */

        .aviso {
            margin-top: 30px;
            padding: 20px;
            border-radius: 15px;
            background: #eff6ff;
            border: 1px solid #bfdbfe;
            color: #1e3a8a;
            font-size: 14px;
        }

        /* =========================
           RODAPÉ
        ========================= */

        footer {
            background: #0b1220;
            color: #cbd5e1;
            text-align: center;
            padding: 30px 20px;
            font-size: 13px;
        }

        footer strong {
            color: white;
        }

        .oculto {
            display: none !important;
        }

        /* =========================
           RESPONSIVO
        ========================= */

        @media (max-width: 850px) {

            .aulas,
            .materiais {
                grid-template-columns: repeat(2, 1fr);
            }

            .menu {
                display: none;
            }
        }

        @media (max-width: 560px) {

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

            .cabecalho-disciplina {
                flex-direction: column;
            }

            h1 {
                font-size: 38px;
            }
        }