/* =============================================
   Sistema de Notas - Estilos
   Dark Modern Theme + Glassmorphism
   ============================================= */

/* Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-card: rgba(17, 24, 39, 0.7);
    --bg-glass: rgba(255, 255, 255, 0.04);
    --bg-glass-hover: rgba(255, 255, 255, 0.08);
    --border-glass: rgba(255, 255, 255, 0.08);
    --border-active: rgba(99, 102, 241, 0.5);

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --accent-primary: #6366f1;
    --accent-primary-light: #818cf8;
    --accent-secondary: #8b5cf6;
    --accent-glow: rgba(99, 102, 241, 0.3);

    --success: #22c55e;
    --success-bg: rgba(34, 197, 94, 0.1);
    --success-border: rgba(34, 197, 94, 0.3);

    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.1);
    --warning-border: rgba(245, 158, 11, 0.3);

    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.1);
    --danger-border: rgba(239, 68, 68, 0.3);

    --info: #3b82f6;
    --info-bg: rgba(59, 130, 246, 0.1);

    --cognitivo: #6366f1;
    --procedimental: #0ea5e9;
    --actitudinal: #f59e0b;

    /* Spacing */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 20px var(--accent-glow);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    background-image: 
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.15), transparent),
        radial-gradient(ellipse 60% 40% at 80% 80%, rgba(139, 92, 246, 0.08), transparent);
}

/* =============================================
   Header
   ============================================= */
.app-header {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-glass);
    padding: 16px 24px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 14px;
}

.logo-icon {
    font-size: 32px;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-glow);
}

.logo-text h1 {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--text-primary), var(--accent-primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-text .subtitle {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 400;
}

.header-stats {
    display: flex;
    gap: 12px;
}

.stat-pill {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 8px 20px;
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    min-width: 100px;
}

.stat-label {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    font-weight: 500;
}

.stat-value {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent-primary-light);
}

.alert-badge {
    color: var(--warning) !important;
}

/* =============================================
   Tab Navigation
   ============================================= */
.tab-nav {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-glass);
    padding: 0 24px;
    position: sticky;
    top: 81px;
    z-index: 90;
}

.tab-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    gap: 4px;
    overflow-x: auto;
    scrollbar-width: none;
}

.tab-container::-webkit-scrollbar {
    display: none;
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 20px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
    white-space: nowrap;
    position: relative;
}

.tab-btn:hover {
    color: var(--text-secondary);
    background: var(--bg-glass-hover);
}

.tab-btn.active {
    color: var(--accent-primary-light);
    border-bottom-color: var(--accent-primary);
}

.tab-icon {
    font-size: 1.1rem;
}

.tab-badge {
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--danger);
    color: white;
    font-size: 0.65rem;
    font-weight: 700;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.15); }
}

/* =============================================
   Main Content
   ============================================= */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 24px;
    min-height: calc(100vh - 200px);
}

.tab-content {
    display: none;
    animation: fadeIn 0.4s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.section-header {
    margin-bottom: 28px;
}

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 6px;
    background: linear-gradient(135deg, var(--text-primary), var(--accent-primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* =============================================
   Form Controls
   ============================================= */
.form-controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.select-group label {
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 6px;
    font-weight: 600;
}

.form-select {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.3s ease;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.form-select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* =============================================
   Grade Form
   ============================================= */
.grade-form {
    animation: slideUp 0.4s ease;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.component-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 20px;
    transition: all 0.3s ease;
}

.component-card:hover {
    border-color: var(--border-active);
    box-shadow: var(--shadow-md);
}

.component-card.cognitivo {
    border-top: 3px solid var(--cognitivo);
}

.component-card.procedimental {
    border-top: 3px solid var(--procedimental);
}

.component-card.actitudinal {
    border-top: 3px solid var(--actitudinal);
}

.component-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.component-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

.component-pct {
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 999px;
    background: var(--bg-glass);
    color: var(--text-secondary);
}

.actitudinal-formula {
    background: var(--info-bg);
    border-radius: var(--radius-sm);
    padding: 8px 12px;
    margin-bottom: 16px;
    font-size: 0.75rem;
    color: var(--info);
    font-weight: 500;
}

.input-group {
    margin-bottom: 14px;
}

.input-group:last-child {
    margin-bottom: 0;
}

.input-group label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
    font-weight: 500;
}

.info-tag {
    font-size: 0.65rem;
    display: inline-block;
    padding: 2px 6px;
    background: var(--accent-glow);
    border-radius: var(--radius-sm);
    color: var(--accent-primary-light);
    margin-left: 6px;
    font-weight: 400;
}

.input-group input {
    width: 100%;
    padding: 10px 14px;
    background: rgba(0,0,0,0.3);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.input-group input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.input-group input::placeholder {
    color: var(--text-muted);
    font-weight: 400;
}

/* Examen Semestral highlight */
.examen-semestral label {
    color: var(--warning);
}

.examen-semestral input {
    border-color: var(--warning-border);
}

.examen-semestral input:focus {
    box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.2);
}

/* =============================================
   Calculation Preview
   ============================================= */
.calc-preview {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 20px;
    margin-bottom: 24px;
    animation: fadeIn 0.3s ease;
}

.calc-preview h4 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
}

.preview-item {
    text-align: center;
    padding: 12px;
    background: rgba(0,0,0,0.2);
    border-radius: var(--radius-md);
}

.preview-item.total {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(139, 92, 246, 0.15));
    border: 1px solid var(--border-active);
}

.preview-label {
    display: block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.preview-value {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
}

.preview-item.total .preview-value {
    font-size: 1.5rem;
    background: linear-gradient(135deg, var(--accent-primary-light), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* =============================================
   Buttons
   ============================================= */
.form-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 28px;
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px var(--accent-glow);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--bg-glass);
    color: var(--text-secondary);
    border: 1px solid var(--border-glass);
}

.btn-secondary:hover {
    background: var(--bg-glass-hover);
    color: var(--text-primary);
}

/* =============================================
   Feedback
   ============================================= */
.feedback {
    padding: 14px 20px;
    border-radius: var(--radius-md);
    margin-top: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    animation: slideUp 0.3s ease;
}

.feedback.success {
    background: var(--success-bg);
    border: 1px solid var(--success-border);
    color: var(--success);
}

.feedback.error {
    background: var(--danger-bg);
    border: 1px solid var(--danger-border);
    color: var(--danger);
}

/* =============================================
   Panel de Visualización
   ============================================= */
.panel-container {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.area-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all 0.3s ease;
}

.area-card:hover {
    border-color: var(--border-active);
    box-shadow: var(--shadow-md);
}

.area-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(139, 92, 246, 0.04));
    border-bottom: 1px solid var(--border-glass);
    cursor: pointer;
}

.area-header:hover {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.12), rgba(139, 92, 246, 0.08));
}

.area-title {
    display: flex;
    align-items: center;
    gap: 12px;
}

.area-title h3 {
    font-size: 1.05rem;
    font-weight: 600;
}

.area-pct-badge {
    font-size: 0.7rem;
    padding: 3px 8px;
    border-radius: 999px;
    background: var(--accent-glow);
    color: var(--accent-primary-light);
    font-weight: 600;
}

.area-avg {
    display: flex;
    align-items: center;
    gap: 10px;
}

.area-avg-value {
    font-size: 1.3rem;
    font-weight: 800;
}

.nota-alta { color: var(--success); }
.nota-media { color: var(--warning); }
.nota-baja { color: var(--danger); }
.nota-none { color: var(--text-muted); }

.area-body {
    padding: 0;
}

.materias-table {
    width: 100%;
    border-collapse: collapse;
}

.materias-table th {
    padding: 10px 16px;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    font-weight: 600;
    text-align: center;
    background: rgba(0,0,0,0.15);
    border-bottom: 1px solid var(--border-glass);
}

.materias-table th:first-child {
    text-align: left;
    padding-left: 24px;
}

.materias-table td {
    padding: 12px 16px;
    font-size: 0.85rem;
    text-align: center;
    border-bottom: 1px solid rgba(255,255,255,0.03);
}

.materias-table td:first-child {
    text-align: left;
    padding-left: 24px;
    font-weight: 500;
}

.materias-table tr:last-child td {
    border-bottom: none;
}

.materias-table tr:hover td {
    background: rgba(255,255,255,0.02);
}

.materia-name {
    display: flex;
    align-items: center;
    gap: 8px;
}

.materia-pct {
    font-size: 0.65rem;
    color: var(--text-muted);
    padding: 2px 6px;
    background: var(--bg-glass);
    border-radius: var(--radius-sm);
}

.nota-cell {
    font-weight: 600;
    font-size: 0.9rem;
}

.nota-cell.promedio {
    font-size: 1rem;
    font-weight: 700;
}

/* =============================================
   Meta Container
   ============================================= */
.meta-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
}

.meta-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 20px;
    transition: all 0.3s ease;
}

.meta-card:hover {
    border-color: var(--border-active);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.meta-card.alcanzable {
    border-left: 4px solid var(--success);
}

.meta-card.no-alcanzable {
    border-left: 4px solid var(--danger);
}

.meta-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 14px;
}

.meta-materia {
    font-size: 1rem;
    font-weight: 600;
}

.meta-area {
    font-size: 0.7rem;
    color: var(--text-muted);
}

.meta-status {
    font-size: 0.7rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 999px;
}

.meta-status.alcanzable {
    background: var(--success-bg);
    color: var(--success);
}

.meta-status.no-alcanzable {
    background: var(--danger-bg);
    color: var(--danger);
}

.meta-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.meta-detail {
    text-align: center;
    padding: 10px;
    background: rgba(0,0,0,0.2);
    border-radius: var(--radius-sm);
}

.meta-detail-label {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.meta-detail-value {
    font-size: 1.2rem;
    font-weight: 700;
}

.progress-bar-container {
    margin-top: 14px;
    background: rgba(0,0,0,0.3);
    border-radius: 999px;
    height: 8px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    border-radius: 999px;
    transition: width 1s ease;
    background: linear-gradient(90deg, var(--accent-primary), var(--success));
}

.progress-bar.low {
    background: linear-gradient(90deg, var(--danger), var(--warning));
}

/* =============================================
   Alertas
   ============================================= */
.alertas-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.alerta-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    border-radius: var(--radius-md);
    animation: slideUp 0.3s ease;
    animation-fill-mode: both;
}

.alerta-item:nth-child(1) { animation-delay: 0.05s; }
.alerta-item:nth-child(2) { animation-delay: 0.1s; }
.alerta-item:nth-child(3) { animation-delay: 0.15s; }
.alerta-item:nth-child(4) { animation-delay: 0.2s; }
.alerta-item:nth-child(5) { animation-delay: 0.25s; }

.alerta-item.warning {
    background: var(--warning-bg);
    border: 1px solid var(--warning-border);
}

.alerta-item.danger {
    background: var(--danger-bg);
    border: 1px solid var(--danger-border);
}

.alerta-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.alerta-content {
    flex: 1;
}

.alerta-title {
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 2px;
}

.alerta-item.warning .alerta-title { color: var(--warning); }
.alerta-item.danger .alerta-title { color: var(--danger); }

.alerta-message {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.alerta-value {
    font-size: 1.3rem;
    font-weight: 800;
    flex-shrink: 0;
}

.alerta-item.warning .alerta-value { color: var(--warning); }
.alerta-item.danger .alerta-value { color: var(--danger); }

.no-alertas {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.no-alertas .emoji {
    font-size: 3rem;
    margin-bottom: 12px;
}

.no-alertas p {
    font-size: 1rem;
    color: var(--success);
    font-weight: 500;
}

/* =============================================
   Loading State
   ============================================= */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    color: var(--text-muted);
    gap: 16px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-glass);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state .emoji {
    font-size: 3rem;
    margin-bottom: 12px;
}

/* =============================================
   Footer
   ============================================= */
.app-footer {
    text-align: center;
    padding: 20px;
    color: var(--text-muted);
    font-size: 0.75rem;
    border-top: 1px solid var(--border-glass);
    margin-top: 40px;
}

/* =============================================
   Responsive
   ============================================= */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 12px;
    }

    .header-stats {
        width: 100%;
        justify-content: center;
    }

    .tab-btn {
        padding: 12px 14px;
        font-size: 0.8rem;
    }

    .tab-text {
        display: none;
    }

    .tab-icon {
        font-size: 1.3rem;
    }

    .main-content {
        padding: 16px;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .form-controls {
        grid-template-columns: 1fr;
    }

    .meta-container {
        grid-template-columns: 1fr;
    }

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

    .materias-table {
        font-size: 0.8rem;
    }

    .materias-table th,
    .materias-table td {
        padding: 8px 10px;
    }
}

@media (max-width: 480px) {
    .logo-text h1 {
        font-size: 1rem;
    }
    
    .section-header h2 {
        font-size: 1.2rem;
    }

    .materias-table th:nth-child(n+3),
    .materias-table td:nth-child(n+3) {
        display: none;
    }
}