/* ============================================================
   site.css — Tema CLARO unificado do Portal de Aulas
   ------------------------------------------------------------
   Cobre:
   1. Variáveis e base.
   2. Cabeçalho (banner) e rodapé padrão.
   3. Páginas de ÍNDICE: toolbar de busca + grid de cards
      com favoritar (estrela) e reordenar (arrastar).
   4. Normalização de tema claro para as páginas de slides
      (backdrop claro entre os slides).
   ============================================================ */

:root {
    --navy: #003366;
    --navy-2: #1e3a8a;
    --blue: #3b82f6;
    --blue-ink: #1e40af;
    --bg: #f1f5f9;
    --surface: #ffffff;
    --ink: #0f172a;
    --ink-soft: #475569;
    --line: #e2e8f0;
    --gold: #f59e0b;
    --radius: 14px;
    --shadow: 0 10px 25px rgba(15, 23, 42, 0.08);
    --shadow-hover: 0 18px 40px rgba(15, 23, 42, 0.16);
    --font: "Inter", "DM Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

/* ---------- Base ---------- */
.site-body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: var(--font);
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.site-body * { box-sizing: border-box; }

/* ---------- Cabeçalho (banner) ---------- */
.site-header {
    background: linear-gradient(135deg, var(--navy) 0%, var(--navy-2) 100%);
    color: #fff;
    padding: clamp(28px, 5vw, 56px) 0;
    box-shadow: 0 8px 24px rgba(0, 51, 102, 0.25);
}

.site-header__inner {
    width: min(1180px, 100%);
    margin: 0 auto;
    padding: 0 clamp(16px, 4vw, 40px);
}

.site-header__inner .eyebrow {
    display: inline-block;
    font-size: 0.78rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    font-weight: 600;
    color: #bfdbfe;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 5px 14px;
    border-radius: 999px;
    margin-bottom: 14px;
}

.site-header h1 {
    margin: 0 0 8px;
    font-size: clamp(1.6rem, 4.5vw, 2.6rem);
    font-weight: 800;
    line-height: 1.1;
}

.site-header p { margin: 0; color: #c7d7ee; font-size: clamp(0.95rem, 2.4vw, 1.15rem); }

.site-header__back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    color: #c7d7ee;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
}
.site-header__back:hover { color: #fff; }

/* ---------- Conteúdo principal ---------- */
.site-main {
    width: min(1180px, 100%);
    margin: 0 auto;
    padding: clamp(20px, 4vw, 44px) clamp(16px, 4vw, 40px);
    flex: 1 0 auto;
}

/* ---------- Toolbar (busca + filtro de favoritos) ---------- */
.toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
    margin-bottom: clamp(18px, 3vw, 30px);
}

.toolbar__search {
    position: relative;
    flex: 1 1 280px;
}

.toolbar__search i {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: #94a3b8;
    pointer-events: none;
}

.toolbar__search input {
    width: 100%;
    padding: 13px 16px 13px 44px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--surface);
    font-size: 1rem;
    font-family: inherit;
    color: var(--ink);
    box-shadow: var(--shadow);
    transition: border-color .15s, box-shadow .15s;
}
.toolbar__search input:focus {
    outline: none;
    border-color: var(--blue);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.15);
}

.toolbar__btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 18px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--surface);
    color: var(--ink-soft);
    font-size: 0.92rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: all .15s;
}
.toolbar__btn:hover { border-color: var(--blue); color: var(--blue-ink); }
.toolbar__btn.is-active {
    background: var(--blue);
    border-color: var(--blue);
    color: #fff;
}
.toolbar__btn i { color: var(--gold); }
.toolbar__btn.is-active i { color: #fff; }

.toolbar__hint {
    width: 100%;
    font-size: 0.82rem;
    color: #94a3b8;
    margin: 0;
}

/* ---------- Grid de cards ---------- */
.topic-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: clamp(16px, 2.5vw, 26px);
}

.topic-card {
    position: relative;
    display: flex;
    flex-direction: column;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 24px 22px 22px;
    box-shadow: var(--shadow);
    transition: transform .15s, box-shadow .15s, border-color .15s, opacity .15s;
}
.topic-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }

.topic-card.is-dragging { opacity: 0.4; }
.topic-card.drop-before { border-top: 3px solid var(--blue); }
.topic-card.drop-after { border-bottom: 3px solid var(--blue); }
.topic-card[hidden] { display: none; }

.topic-card__icon {
    font-size: 2.2rem;
    color: var(--blue);
    margin-bottom: 16px;
}

.topic-card__badge {
    align-self: flex-start;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--blue-ink);
    background: rgba(59, 130, 246, 0.1);
    padding: 3px 10px;
    border-radius: 999px;
    margin-bottom: 10px;
}

.topic-card__title {
    margin: 0 0 8px;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--ink);
    padding-right: 56px; /* espaço p/ estrela e grip */
}

.topic-card__desc {
    margin: 0 0 20px;
    font-size: 0.9rem;
    line-height: 1.55;
    color: var(--ink-soft);
    flex: 1 0 auto;
}

.topic-card__link {
    display: block;
    text-align: center;
    background: var(--navy);
    color: #fff;
    padding: 12px;
    border-radius: 10px;
    font-weight: 600;
    text-decoration: none;
    transition: background .15s;
}
.topic-card__link:hover { background: var(--navy-2); }

/* Estrela de favorito */
.topic-card__fav {
    position: absolute;
    top: 16px;
    right: 14px;
    width: 34px;
    height: 34px;
    border: none;
    background: transparent;
    color: #cbd5e1;
    font-size: 1.15rem;
    cursor: pointer;
    border-radius: 50%;
    transition: color .15s, background .15s, transform .15s;
}
.topic-card__fav:hover { background: #fef3c7; color: var(--gold); transform: scale(1.1); }
.topic-card__fav.is-fav { color: var(--gold); }

/* Alça de arrastar */
.topic-card__drag {
    position: absolute;
    top: 18px;
    right: 50px;
    color: #cbd5e1;
    cursor: grab;
    font-size: 1rem;
    user-select: none;
}
.topic-card__drag:active { cursor: grabbing; }
.topic-card:hover .topic-card__drag { color: #94a3b8; }

/* Mensagem de busca vazia */
.topic-empty {
    text-align: center;
    color: #94a3b8;
    font-size: 1rem;
    padding: 50px 0;
}
.topic-empty[hidden] { display: none; }

/* ---------- Voltar ao portal ---------- */
.back-portal {
    margin-top: clamp(28px, 5vw, 56px);
    text-align: center;
}
.back-portal a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--navy);
    font-weight: 600;
    text-decoration: none;
}
.back-portal a:hover { color: var(--navy-2); }

/* ---------- Rodapé padrão ---------- */
.site-footer {
    background: #0f172a;
    color: #94a3b8;
    text-align: center;
    padding: clamp(18px, 3vw, 32px) 16px;
    font-size: 0.9rem;
    margin-top: auto;
}
.site-footer p { margin: 4px 0; }

/* ============================================================
   Normalização de TEMA CLARO para as páginas de SLIDES
   ------------------------------------------------------------
   As páginas de conteúdo usam .slide ou .slide-container e
   já trazem slides claros; aqui apenas garantimos um backdrop
   claro entre os slides (alguns arquivos usavam fundo escuro).
   ============================================================ */
body.slides-light {
    background: var(--bg) !important;
    color: var(--ink);
}

/* Banner de capa unificado (vale para .hero e .title-layout) */
body.slides-light .hero,
body.slides-light .title-layout {
    background: linear-gradient(135deg, var(--navy) 0%, var(--navy-2) 100%) !important;
    color: #fff !important;
}
body.slides-light .hero h1,
body.slides-light .title-layout h1 { color: #fff !important; }

/* Botão "voltar" dos slides */
.slide-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 30px;
    color: #e2e8f0;
    text-decoration: none;
    border: 1px solid rgba(255, 255, 255, 0.35);
    padding: 10px 22px;
    border-radius: 999px;
    font-size: 0.95rem;
}
.slide-back:hover { background: rgba(255, 255, 255, 0.12); }

/* ============================================================
   Páginas de ARTIGO (conteúdo em texto corrido) — tema claro
   Estrutura: <body class="site-body"> + <main class="site-main doc">
   ============================================================ */
.doc {
    background: var(--surface);
    max-width: 900px;
}
.doc h2 {
    color: var(--navy);
    border-bottom: 2px solid var(--blue);
    padding-bottom: 8px;
    margin: 34px 0 14px;
    font-size: 1.5rem;
}
.doc h3 { color: var(--blue-ink); margin: 22px 0 10px; font-size: 1.2rem; }
.doc p { color: var(--ink-soft); margin: 0 0 16px; line-height: 1.7; }
.doc ul, .doc ol { color: var(--ink-soft); margin: 0 0 16px; padding-left: 22px; line-height: 1.7; }
.doc li { margin-bottom: 8px; }
.doc strong { color: var(--ink); }
.doc .highlight {
    background: #fef3c7;
    color: #92400e;
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 600;
}
.doc .info-box, .doc .highlight-box {
    border-left: 5px solid var(--blue);
    background: #f0f9ff;
    padding: 16px 20px;
    border-radius: 8px;
    margin: 18px 0;
}
.doc .formula {
    background: #0f172a;
    color: #38bdf8;
    padding: 14px;
    border-radius: 8px;
    text-align: center;
    font-family: "Fira Code", ui-monospace, monospace;
    margin: 18px 0;
}
.doc .diagram-placeholder {
    background: #eef2f7;
    border: 2px dashed #cbd5e1;
    padding: 26px;
    text-align: center;
    color: #64748b;
    border-radius: 8px;
    margin: 18px 0;
}

/* ---------- Acessibilidade ---------- */
a:focus-visible, button:focus-visible, input:focus-visible {
    outline: 3px solid var(--blue);
    outline-offset: 2px;
    border-radius: 6px;
}

@media (prefers-reduced-motion: reduce) {
    * { transition: none !important; }
}