@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
    --bg-deep: #0F1128;
    --bg-panel: #1B1E3D;
    --bg-panel-alt: #232752;
    --border-soft: rgba(148, 163, 184, 0.14);
    --border-strong: rgba(148, 163, 184, 0.28);

    --accent-teal: #2DD4BF;
    --accent-teal-dim: rgba(45, 212, 191, 0.14);
    --accent-violet: #8B7FF0;

    --coral: #FB7185;
    --coral-bg: rgba(251, 113, 133, 0.14);
    --amber: #FBBF24;
    --amber-bg: rgba(251, 191, 36, 0.14);
    --success: #34D399;
    --success-bg: rgba(52, 211, 153, 0.14);

    --text-light: #F1F5F9;
    --text-muted: #94A3B8;
    --text-faint: #5B6280;

    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    --radius: 14px;
    --radius-sm: 8px;
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--bg-deep);
    color: var(--text-light);
    font-family: var(--font-body);
    -webkit-font-smoothing: antialiased;
}

body {
    background-image:
        radial-gradient(ellipse 900px 500px at 15% -10%, rgba(139, 127, 240, 0.12), transparent),
        radial-gradient(ellipse 700px 500px at 90% 10%, rgba(45, 212, 191, 0.08), transparent);
    background-attachment: fixed;
    min-height: 100vh;
}

h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 600;
    margin: 0;
    letter-spacing: -0.01em;
}

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

.mono { font-family: var(--font-mono); }

/* ---------- Layout con sidebar ---------- */

.app-shell {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 232px;
    flex-shrink: 0;
    background: rgba(19, 21, 46, 0.7);
    backdrop-filter: blur(20px);
    border-right: 1px solid var(--border-soft);
    padding: 28px 18px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    position: sticky;
    top: 0;
    height: 100vh;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 32px;
    padding: 0 10px;
}

.brand-mark {
    width: 34px;
    height: 34px;
    border-radius: 9px;
    background: linear-gradient(135deg, var(--accent-teal), var(--accent-violet));
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 15px;
    color: #0F1128;
    animation: pulse-glow 3s ease-in-out infinite;
}

.brand-text {
    font-family: var(--font-display);
    font-size: 15px;
    font-weight: 600;
    line-height: 1.2;
}
.brand-text span {
    display: block;
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 400;
    font-family: var(--font-body);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 14px;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 500;
    transition: background 0.2s var(--ease), color 0.2s var(--ease), transform 0.15s var(--ease);
}
.nav-link:hover {
    background: var(--bg-panel-alt);
    color: var(--text-light);
    transform: translateX(2px);
}
.nav-link.active {
    background: var(--accent-teal-dim);
    color: var(--accent-teal);
}
.nav-link i { font-size: 18px; }

.sidebar-footer {
    margin-top: auto;
    border-top: 1px solid var(--border-soft);
    padding-top: 14px;
}

.main-content {
    flex: 1;
    padding: 36px 44px;
    max-width: 1100px;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 28px;
    animation: fade-up 0.5s var(--ease);
}
.page-header h1 { font-size: 26px; }
.page-header p { color: var(--text-muted); font-size: 14px; margin-top: 4px; }

/* ---------- Tarjetas ---------- */

.card {
    background: var(--bg-panel);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius);
    padding: 20px 22px;
    position: relative;
    overflow: hidden;
    transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}
.card:hover {
    border-color: var(--border-strong);
}
.card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius);
    padding: 1px;
    background: linear-gradient(120deg, transparent 30%, var(--accent-teal), transparent 70%);
    background-size: 250% 250%;
    background-position: 100% 0;
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.4s var(--ease), background-position 1.2s var(--ease);
    pointer-events: none;
}
.card:hover::before {
    opacity: 1;
    background-position: 0% 0;
}

.metric-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 14px;
    margin-bottom: 28px;
}

.metric-card {
    background: var(--bg-panel);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius);
    padding: 18px 20px;
    animation: fade-up 0.5s var(--ease) backwards;
}
.metric-card .label {
    font-size: 12.5px;
    color: var(--text-muted);
    margin-bottom: 6px;
}
.metric-card .value {
    font-family: var(--font-mono);
    font-size: 26px;
    font-weight: 500;
}
.metric-card.alerta .value { color: var(--coral); }

/* ---------- Badges de estado ---------- */

.badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 12px;
    font-weight: 500;
    padding: 4px 11px;
    border-radius: 100px;
    white-space: nowrap;
}
.badge-rojo { background: var(--coral-bg); color: var(--coral); }
.badge-amarillo { background: var(--amber-bg); color: var(--amber); }
.badge-verde { background: var(--success-bg); color: var(--success); }
.badge-dot {
    width: 6px; height: 6px; border-radius: 50%;
    background: currentColor;
    animation: blink-soft 2s ease-in-out infinite;
}

/* ---------- Grupos / acordeón ---------- */

.grupo-item {
    border: 1px solid var(--border-soft);
    border-radius: var(--radius);
    margin-bottom: 12px;
    overflow: hidden;
    background: var(--bg-panel);
}

.grupo-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    cursor: pointer;
    user-select: none;
    transition: background 0.2s var(--ease);
}
.grupo-header:hover { background: var(--bg-panel-alt); }

.grupo-header-left {
    display: flex;
    align-items: center;
    gap: 10px;
}
.grupo-chevron {
    font-size: 18px;
    color: var(--text-muted);
    transition: transform 0.3s var(--ease);
}
.grupo-item.abierto .grupo-chevron { transform: rotate(90deg); }

.grupo-tipo-tag {
    font-size: 11px;
    color: var(--text-muted);
    background: var(--bg-panel-alt);
    padding: 2px 9px;
    border-radius: 100px;
}

.grupo-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s var(--ease);
    border-top: 1px solid transparent;
}
.grupo-item.abierto .grupo-body {
    border-top: 1px solid var(--border-soft);
}

.estudiante-panel {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-soft);
    animation: fade-in 0.3s var(--ease);
}
.estudiante-panel:last-child { border-bottom: none; }

.estudiante-panel-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}
.estudiante-nombre { font-weight: 500; font-size: 14.5px; }

/* Barra de progreso tipo trazo de circuito */
.progreso-track {
    flex: 1;
    height: 7px;
    background: var(--bg-panel-alt);
    border-radius: 100px;
    overflow: hidden;
    position: relative;
}
.progreso-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-violet), var(--accent-teal));
    border-radius: 100px;
    transition: width 0.6s var(--ease);
    position: relative;
}
.progreso-fill::after {
    content: '';
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(90deg, rgba(255,255,255,0.35) 0 2px, transparent 2px 8px);
    animation: dash-flow 1.2s linear infinite;
}

.progreso-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 4px;
}
.progreso-label {
    font-family: var(--font-mono);
    font-size: 12.5px;
    color: var(--text-muted);
    min-width: 38px;
    text-align: right;
}
.progreso-sub {
    font-size: 12px;
    color: var(--text-faint);
    margin-bottom: 12px;
}

/* ---------- Botones ---------- */

.btn {
    font-family: var(--font-body);
    font-size: 13.5px;
    font-weight: 500;
    padding: 9px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-strong);
    background: transparent;
    color: var(--text-light);
    cursor: pointer;
    transition: all 0.2s var(--ease);
    display: inline-flex;
    align-items: center;
    gap: 7px;
}
.btn:hover { background: var(--bg-panel-alt); transform: translateY(-1px); }
.btn:active { transform: translateY(0) scale(0.98); }

.btn-primario {
    background: var(--accent-teal);
    color: #0F1128;
    border-color: var(--accent-teal);
    font-weight: 600;
}
.btn-primario:hover { background: #26bfab; box-shadow: 0 0 0 4px var(--accent-teal-dim); }

.btn-block { width: 100%; justify-content: center; }
.btn-sm { padding: 6px 12px; font-size: 12.5px; }

.btn-pago-listo {
    background: var(--success-bg);
    color: var(--success);
    border-color: var(--success);
    animation: aparecer-pop 0.4s var(--ease);
}

/* ---------- Formularios inline ---------- */

.form-inline {
    background: var(--bg-panel-alt);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius-sm);
    padding: 14px 16px;
    margin-top: 12px;
    animation: expandir 0.3s var(--ease);
}

.form-row { display: flex; gap: 10px; margin-bottom: 10px; }
.form-row:last-child { margin-bottom: 0; }
.form-group { flex: 1; display: flex; flex-direction: column; gap: 5px; }
.form-group label { font-size: 12px; color: var(--text-muted); }

input, select, textarea {
    font-family: var(--font-body);
    font-size: 13.5px;
    background: var(--bg-deep);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius-sm);
    padding: 9px 11px;
    color: var(--text-light);
    outline: none;
    transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
    width: 100%;
}
input:focus, select:focus, textarea:focus {
    border-color: var(--accent-teal);
    box-shadow: 0 0 0 3px var(--accent-teal-dim);
}
textarea { resize: vertical; min-height: 60px; }

/* ---------- Tabla simple ---------- */

.tabla { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.tabla th {
    text-align: left;
    color: var(--text-muted);
    font-weight: 500;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-soft);
}
.tabla td {
    padding: 13px 14px;
    border-bottom: 1px solid var(--border-soft);
}
.tabla tr:last-child td { border-bottom: none; }
.tabla tr:hover td { background: var(--bg-panel-alt); }

/* ---------- Login ---------- */

.login-shell {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}
.login-card {
    width: 360px;
    background: var(--bg-panel);
    border: 1px solid var(--border-soft);
    border-radius: 18px;
    padding: 36px 32px;
    animation: aparecer-pop 0.5s var(--ease);
}
.login-error {
    background: var(--coral-bg);
    color: var(--coral);
    font-size: 13px;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
}

/* ---------- Utilidades ---------- */

.flex-between { display: flex; justify-content: space-between; align-items: center; }
.text-muted { color: var(--text-muted); }
.mt-16 { margin-top: 16px; }
.mb-16 { margin-bottom: 16px; }
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}
.empty-state i { font-size: 34px; opacity: 0.5; margin-bottom: 10px; display: block; }

@media (max-width: 780px) {
    .app-shell { flex-direction: column; }
    .sidebar {
        width: 100%;
        height: auto;
        position: sticky;
        top: 0;
        flex-direction: row;
        align-items: center;
        padding: 12px 16px;
        overflow-x: auto;
        z-index: 10;
    }
    .brand { margin-bottom: 0; }
    .brand-text span { display: none; }
    .sidebar-footer { display: none; }
    .main-content { padding: 22px 18px; max-width: 100%; }
    .form-row { flex-direction: column; }
}

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