/* =====================================================================
   Alena LMS — capa de diseño (se carga DESPUÉS de style.css)
   1. Tokens (paleta, tipografía, densidad, sombras)
   2. Base tipográfica compacta
   3. Componentes: botones, cards, badges, tablas, KPI, page-header
   4. Shell: cabecera, navegación, drawer móvil, bottom nav
   5. Formularios en grilla, editor enriquecido
   6. Analítica: gráficos, report builder
   7. Móvil: tablas → tarjetas, touch targets
   ===================================================================== */

/* ---------- 1. Tokens ---------- */
:root {
    /* Marca (escala) */
    --brand-50: #ecfdf8;
    --brand-100: #d1faf0;
    --brand-200: #a6f3df;
    --brand-300: #5eead4;
    --brand-400: #2fd1b7;
    --brand-500: #0faf9a;
    --brand-600: #0c9483;
    --brand-700: #087f5b;
    --brand-800: #066248;
    --brand-900: #064838;
    --brand-gradient: linear-gradient(135deg, var(--brand-700), var(--brand-400));

    /* Acentos secundarios (para gráficos, estados informativos y variedad visual) */
    --accent: #4f46e5;
    --accent-soft: #eef2ff;
    --accent-warm: #f59e0b;
    --accent-warm-soft: #fef3c7;
    --accent-rose: #e11d48;
    --accent-sky: #0ea5e9;
    --accent-sky-soft: #e0f2fe;

    /* Estados (fondo suave + texto) */
    --success: #16a34a;  --success-soft: #dcfce7;  --success-ink: #166534;
    --warning: #d97706;  --warning-soft: #fef3c7;  --warning-ink: #92400e;
    --danger: #dc2626;   --danger-soft: #fee2e2;   --danger-ink: #991b1b;
    --info: #2563eb;     --info-soft: #dbeafe;     --info-ink: #1e40af;

    /* Neutros */
    --bg: #f3f6f9;
    --surface: #ffffff;
    --surface-2: #f8fafc;
    --bg-secondary: #eef2f6;
    --border: #e3e9ef;
    --border-strong: #cfd8e1;
    --text: #0f1b2d;
    --text-secondary: #46566b;
    --text-tertiary: #64748b;
    --text-disabled: #97a3b4;

    /* Cabecera oscura de contraste */
    --ink: #0b1f24;
    --ink-2: #12363a;
    --ink-text: #dbeeea;
    --ink-muted: #8fb1ab;

    /* Forma y elevación */
    --radius-xs: 6px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --shadow-xs: 0 1px 2px rgba(15, 27, 45, 0.05);
    --shadow-sm: 0 1px 3px rgba(15, 27, 45, 0.07), 0 1px 2px rgba(15, 27, 45, 0.04);
    --shadow-md: 0 6px 16px -4px rgba(15, 27, 45, 0.10), 0 2px 6px rgba(15, 27, 45, 0.05);
    --shadow-lg: 0 16px 32px -8px rgba(15, 27, 45, 0.18), 0 4px 10px rgba(15, 27, 45, 0.06);
    --ring: 0 0 0 3px rgba(15, 175, 154, 0.22);

    /* Movimiento */
    --ease: all 0.2s ease;

    /* Densidad (altura de controles) */
    --control-h: 36px;
    --control-h-sm: 30px;
    --cell-py: 0.55rem;
    --cell-px: 0.75rem;
}

/* ---------- 2. Base tipográfica compacta ---------- */
html { font-size: 15px; -webkit-text-size-adjust: 100%; }
html.app-compact { font-size: 14px; }

body { line-height: 1.5; background: var(--bg); }

h1 { font-size: 1.6rem; line-height: 1.25; margin: 0 0 0.35rem; font-weight: 700; }
h2 { font-size: 1.2rem; line-height: 1.3; margin: 1.4rem 0 0.6rem; font-weight: 700; }
h3 { font-size: 1.03rem; line-height: 1.35; margin: 0 0 0.5rem; font-weight: 600; }
h4 { font-size: 0.92rem; }
p { margin-top: 0; }
.muted { color: var(--text-tertiary); }
small, .small { font-size: 0.82rem; }

main { padding: 1.4rem 1.25rem 2.5rem; }
.admin-layout main { max-width: 1240px; }

/* ---------- 3. Componentes ---------- */

/* Botones — jerarquía: primario (relleno) > secundario (borde) > ghost > peligro */
.btn {
    min-height: var(--control-h);
    padding: 0.4rem 1rem;
    font-size: 0.92rem;
    border-radius: var(--radius-sm);
    background-image: var(--brand-gradient);
    box-shadow: 0 1px 2px rgba(8, 127, 91, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.18);
    transition: var(--ease);
    line-height: 1.2;
    white-space: nowrap;
}
.btn:hover { filter: none; transform: translateY(-1px); box-shadow: 0 6px 14px -4px rgba(8, 127, 91, 0.45); color: #fff; }
.btn:active { transform: translateY(0); box-shadow: 0 1px 2px rgba(8, 127, 91, 0.25); }
.btn:focus-visible { outline: none; box-shadow: var(--ring); }
.btn.btn-secondary {
    background: var(--surface); color: var(--text-secondary); border: 1px solid var(--border-strong);
    box-shadow: var(--shadow-xs);
}
.btn.btn-secondary:hover { background: var(--brand-50); border-color: var(--brand-400); color: var(--brand-800); box-shadow: var(--shadow-sm); }
.btn.btn-ghost { background: transparent; color: var(--text-secondary); box-shadow: none; border: 1px solid transparent; }
.btn.btn-ghost:hover { background: var(--bg-secondary); color: var(--text); transform: none; box-shadow: none; }
.btn.btn-danger { background: var(--danger); background-image: none; box-shadow: 0 1px 2px rgba(220, 38, 38, 0.3); }
.btn.btn-danger:hover { box-shadow: 0 6px 14px -4px rgba(220, 38, 38, 0.5); }
.btn-sm, .btn.btn-sm { min-height: var(--control-h-sm); padding: 0.2rem 0.7rem; font-size: 0.82rem; }
.btn svg { width: 16px; height: 16px; flex-shrink: 0; }

/* Cards — elevación suave, borde redondeado, contraste contra el fondo */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 1.1rem 1.25rem;
    margin-bottom: 1rem;
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
}
.card:hover { box-shadow: var(--shadow-md); }
.card > h3:first-child { margin-top: 0; }
.card-header { display: flex; align-items: center; justify-content: space-between; gap: 0.75rem; margin-bottom: 0.9rem; flex-wrap: wrap; }
.card-header h3 { margin: 0; display: flex; align-items: center; gap: 0.5rem; }
.card-header h3 svg { width: 18px; height: 18px; color: var(--brand-600); }
.card-flush { padding: 0; overflow: hidden; }

/* Badges — más vistosos, con variantes de estado */
.badge {
    display: inline-flex; align-items: center; gap: 0.35rem;
    font-size: 0.72rem; font-weight: 600; letter-spacing: 0.01em;
    padding: 0.18rem 0.6rem; border-radius: 999px;
    background: var(--brand-100); color: var(--brand-800);
    border: 1px solid transparent; line-height: 1.4; white-space: nowrap;
}
.badge-success { background: var(--success-soft); color: var(--success-ink); }
.badge-warning { background: var(--warning-soft); color: var(--warning-ink); }
.badge-danger { background: var(--danger-soft); color: var(--danger-ink); }
.badge-info { background: var(--info-soft); color: var(--info-ink); }
.badge-accent { background: var(--accent-soft); color: var(--accent); }
.badge-neutral { background: var(--bg-secondary); color: var(--text-secondary); }
.badge-dot::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }

/* Iconos de acción en tablas */
.icon-btn { width: 32px; height: 32px; transition: var(--ease); border-radius: var(--radius-sm); }
.icon-btn:hover { background: var(--brand-50); color: var(--brand-700); }
.icon-btn-danger:hover { background: var(--danger-soft); color: var(--danger-ink); }

/* Tablas — densas, con hover de fila */
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th {
    padding: 0.6rem var(--cell-px); font-size: 0.72rem; letter-spacing: 0.05em; font-weight: 600;
    color: var(--text-tertiary); background: var(--surface-2); border-bottom: 1px solid var(--border); text-transform: uppercase;
    white-space: nowrap;
}
td { padding: var(--cell-py) var(--cell-px); border-bottom: 1px solid var(--border); vertical-align: middle; }
tbody tr { transition: background-color 0.15s ease; }
tbody tr:hover { background: var(--brand-50); }
tbody tr:last-child td { border-bottom: none; }
tfoot td { font-weight: 700; background: var(--surface-2); border-top: 2px solid var(--border-strong); border-bottom: none; }
.card.table-scroll, .card-table { padding: 0; }
.card.table-scroll { overflow: hidden; overflow-x: auto; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }

/* KPI cards — compactas, con tendencia */
.kpi-grid { grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 0.85rem; margin-bottom: 1.1rem; }
.kpi-card {
    padding: 0.85rem 1rem; gap: 0.75rem; align-items: center; position: relative; overflow: hidden;
    transition: var(--ease); border-radius: var(--radius-md); box-shadow: var(--shadow-sm);
}
.kpi-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.kpi-card::after {
    content: ""; position: absolute; right: -18px; top: -18px; width: 70px; height: 70px; border-radius: 50%;
    background: var(--brand-50); opacity: 0.8; pointer-events: none;
}
.kpi-icon { width: 38px; height: 38px; border-radius: 10px; background: var(--brand-100); color: var(--brand-700); position: relative; z-index: 1; }
.kpi-icon svg { width: 19px; height: 19px; }
.kpi-value { font-size: 1.35rem; font-weight: 700; line-height: 1.15; position: relative; z-index: 1; }
.kpi-label { font-size: 0.78rem; color: var(--text-tertiary); position: relative; z-index: 1; }
.kpi-card .kpi-body { min-width: 0; }
.kpi-trend {
    display: inline-flex; align-items: center; gap: 0.15rem; font-size: 0.72rem; font-weight: 700;
    padding: 0.05rem 0.4rem; border-radius: 999px; margin-left: 0.35rem; vertical-align: middle;
}
.kpi-trend.up { background: var(--success-soft); color: var(--success-ink); }
.kpi-trend.down { background: var(--danger-soft); color: var(--danger-ink); }
.kpi-trend.flat { background: var(--bg-secondary); color: var(--text-tertiary); }
.kpi-foot { font-size: 0.72rem; color: var(--text-tertiary); margin-top: 0.1rem; position: relative; z-index: 1; }
.kpi-card.kpi-accent .kpi-icon { background: var(--accent-soft); color: var(--accent); }
.kpi-card.kpi-warm .kpi-icon { background: var(--accent-warm-soft); color: var(--warning-ink); }
.kpi-card.kpi-sky .kpi-icon { background: var(--accent-sky-soft); color: #0369a1; }
.kpi-card.kpi-danger .kpi-icon { background: var(--danger-soft); color: var(--danger-ink); }

/* Page header — bloque superior con icono, título, acciones */
.page-header {
    display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
    margin: 0 0 1rem; padding: 0.9rem 1.1rem;
    background: linear-gradient(135deg, var(--brand-50), var(--surface) 70%);
    border: 1px solid var(--brand-100); border-radius: var(--radius-md); box-shadow: var(--shadow-xs);
}
.page-header-main { display: flex; align-items: center; gap: 0.85rem; min-width: 0; }
.page-header-icon {
    width: 42px; height: 42px; border-radius: 12px; flex-shrink: 0;
    background: var(--brand-gradient); color: #fff; display: flex; align-items: center; justify-content: center;
    box-shadow: 0 6px 14px -6px rgba(8, 127, 91, 0.6);
}
.page-header-icon svg { width: 21px; height: 21px; }
.page-header h1 { margin: 0; font-size: 1.35rem; }
.page-header p { margin: 0.1rem 0 0; color: var(--text-tertiary); font-size: 0.86rem; }
.page-header-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; align-items: center; }
.crumbs { font-size: 0.8rem; margin: 0 0 0.5rem; color: var(--text-tertiary); }
.crumbs a { color: var(--text-tertiary); font-weight: 500; }
.crumbs a:hover { color: var(--brand-700); }

.actions-row { margin-bottom: 0.9rem; }
.alert { display: flex; gap: 0.6rem; align-items: flex-start; padding: 0.7rem 0.9rem; border-radius: var(--radius-sm); font-size: 0.88rem; margin-bottom: 1rem; }
.alert-info { background: var(--info-soft); color: var(--info-ink); }
.alert-warning { background: var(--warning-soft); color: var(--warning-ink); }
.error-box { border-radius: var(--radius-sm); }

/* Entradas de formulario compactas */
form.stacked label, label.field-label { margin: 0.75rem 0 0.25rem; font-size: 0.8rem; font-weight: 600; letter-spacing: 0.005em; color: var(--text-secondary); }
form.stacked input[type="text"],
form.stacked input[type="email"],
form.stacked input[type="password"],
form.stacked input[type="url"],
form.stacked input[type="search"],
form.stacked input[type="tel"],
form.stacked input[type="number"],
form.stacked input[type="date"],
form.stacked input[type="month"],
form.stacked input[type="time"],
form.stacked select {
    min-height: var(--control-h); padding: 0.4rem 0.7rem; font-size: 0.92rem; border-radius: var(--radius-sm);
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}
form.stacked textarea { padding: 0.55rem 0.7rem; font-size: 0.92rem; min-height: 110px; border-radius: var(--radius-sm); transition: border-color 0.2s ease, box-shadow 0.2s ease; }
form.stacked input:focus, form.stacked select:focus, form.stacked textarea:focus { border-color: var(--brand-500); box-shadow: var(--ring); }
form.stacked input:hover:not(:focus), form.stacked select:hover:not(:focus), form.stacked textarea:hover:not(:focus) { border-color: var(--text-disabled); }
form.stacked select { padding-right: 1.8rem; }
.stacked .muted { font-size: 0.78rem; }

/* Barra de filtros */
.filter-card { padding: 0.75rem 1rem; }
.filter-card form.stacked label { margin-top: 0; }
/* Barra de filtros en una sola fila: campos con etiqueta arriba, botón alineado con los controles */
.filter-bar { display: flex; flex-wrap: wrap; align-items: flex-end; gap: 0.75rem; padding: 0.75rem 1rem; }
.filter-bar .field { display: grid; gap: 0.25rem; margin: 0; }
.filter-bar label { margin: 0 !important; }
.filter-bar .field > input, .filter-bar .field > select { width: 100%; }
.filter-bar .filter-grow { flex: 1; min-width: 220px; }
.filter-bar .btn { margin: 0; }