/* ============================================
   MOBILE-FIRST DESIGN (Android App Feel)
   ============================================ */

:root {
    --bg-primary: #0f1419;
    --bg-secondary: #1a1f2e;
    --bg-tertiary: #252d3d;
    --bg-accent: #2a3f5f;
    --text-primary: #f0f4f8;
    --text-secondary: #a0a8b8;
    --text-tertiary: #7a8290;
    --accent-primary: #667eea;
    --accent-secondary: #764ba2;
    --accent-tertiary: #f093fb;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --border-color: #3a4556;
    --border-radius: 12px;
    --shadow: 0 8px 32px rgba(0,0,0,0.3);
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.15);
    --shadow-lg: 0 20px 48px rgba(0,0,0,0.4);
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', sans-serif;
    --font-mono: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 22px;
    --font-size-2xl: 28px;
    --font-size-3xl: 34px;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --transition-fast: 150ms ease;
    --transition-standard: 300ms ease;
    /* Bottom nav height */
    --bottom-nav-height: 64px;
    --top-app-bar-height: 56px;
}
[data-theme="light"] {
    --bg-primary: #f5f7fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f0f2f5;
    --bg-accent: #e8ecf8;
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-tertiary: #718096;
    --border-color: #e2e8f0;
}
* { margin:0; padding:0; box-sizing:border-box; }
body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height:1.6;
    font-size:var(--font-size-base);
    -webkit-font-smoothing: antialiased;
    padding-bottom: calc(var(--bottom-nav-height) + 16px); /* space for bottom nav */
    padding-top: var(--top-app-bar-height);
}

/* --- Top App Bar (mobile) --- */
.top-app-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--top-app-bar-height);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-md);
    z-index: 100;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}
.app-bar-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-lg);
}
.app-bar-logo { font-size: 1.8rem; }
.app-bar-action {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    padding: var(--spacing-sm);
    border-radius: 50%;
    cursor: pointer;
}
.app-bar-action:hover { background: var(--bg-tertiary); }

/* --- Bottom Navigation (mobile) --- */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--bottom-nav-height);
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-around;
    align-items: center;
    z-index: 100;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}
.bottom-nav-item {
    background: none;
    border: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--text-tertiary);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-fast);
    flex: 1;
    max-width: 72px;
}
.bottom-nav-item .nav-icon { font-size: 24px; line-height: 1; }
.bottom-nav-item .nav-label { font-size: 10px; }
.bottom-nav-item.active {
    color: var(--accent-primary);
}
.bottom-nav-item.active .nav-icon { transform: scale(1.1); }

/* --- Sidebar (desktop only) --- */
.sidebar {
    display: none; /* hidden on mobile */
    width: 200px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    flex-direction: column;
    height: fit-content;
    position: sticky;
    top: var(--spacing-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}
.logo {
    display:flex;
    align-items:center;
    gap:var(--spacing-md);
    margin-bottom:var(--spacing-2xl);
}
.logo-mark { font-size:2rem; }
.logo-text {
    font-size:var(--font-size-lg);
    font-weight:var(--font-weight-bold);
    line-height:1.2;
    background:linear-gradient(135deg, var(--accent-primary), var(--accent-tertiary));
    -webkit-background-clip:text;
    -webkit-text-fill-color:transparent;
}
.nav-items { list-style:none; flex:1; }
.nav-link {
    display:block;
    padding:var(--spacing-md);
    margin-bottom:var(--spacing-sm);
    color:var(--text-secondary);
    text-decoration:none;
    border-radius:8px;
    transition:all var(--transition-fast);
    cursor:pointer;
    font-size:var(--font-size-sm);
    font-weight:var(--font-weight-medium);
}
.nav-link:hover { background:var(--bg-accent); color:var(--text-primary); }
.nav-link.active {
    background:linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color:white;
}
.sidebar-footer {
    padding-top:var(--spacing-lg);
    border-top:1px solid var(--border-color);
}
.streak-badge { text-align:center; }
.streak-value {
    font-size:var(--font-size-2xl);
    font-weight:var(--font-weight-bold);
    background:linear-gradient(135deg, var(--accent-primary), var(--accent-tertiary));
    -webkit-background-clip:text;
    -webkit-text-fill-color:transparent;
}
.streak-label { font-size:var(--font-size-xs); color:var(--text-secondary); margin-top:var(--spacing-xs); }

/* --- App Container --- */
.app-container {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-md);
    max-width: 1200px;
    margin: 0 auto;
}
.main-content {
    flex: 1;
    max-width: 100%;
}

/* --- Pages --- */
.page { display: none; }
.page.active { display: block; animation: fadeIn var(--transition-standard); }
@keyframes fadeIn { from { opacity:0; transform:translateY(8px); } to { opacity:1; transform:translateY(0); } }

/* --- Page Header --- */
.page-header {
    margin-bottom: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}
.page-header h1 { font-size: var(--font-size-2xl); font-weight: var(--font-weight-bold); }
.subtitle { color: var(--text-secondary); font-size: var(--font-size-base); }

/* --- Cards --- */
.card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-standard);
}
.card:hover { border-color: var(--accent-primary); }
.card h2 { font-size: var(--font-size-xl); font-weight: var(--font-weight-bold); margin-bottom: var(--spacing-md); }
.card h3 { font-size: var(--font-size-lg); font-weight: var(--font-weight-semibold); margin-bottom: var(--spacing-md); }
.card.danger { border-color: var(--danger); background: rgba(239,68,68,0.05); }

/* --- Metrics --- */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}
.metric-item { text-align: center; }
.metric-label { color: var(--text-secondary); font-size: var(--font-size-xs); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: var(--spacing-xs); }
.metric-value {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-tertiary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* --- What to study --- */
.card-primary { border: 2px solid var(--accent-primary); background: linear-gradient(135deg, rgba(102,126,234,0.05), rgba(118,75,162,0.02)); }
.subject-focus {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--spacing-md);
}
.subject-icon { font-size: 2.5rem; }
.subject-info h3 { font-size: var(--font-size-lg); margin-bottom: var(--spacing-xs); }
.topic-name { color: var(--text-secondary); }
.session-duration { display: flex; gap: var(--spacing-sm); font-size: var(--font-size-sm); color: var(--text-secondary); margin-bottom: var(--spacing-md); }
.duration-value { font-size: var(--font-size-xl); font-weight: var(--font-weight-bold); color: var(--text-primary); }
.task-list { margin-bottom: var(--spacing-md); }
.task-list ul { list-style: none; margin-top: var(--spacing-sm); }
.task-list li { padding: var(--spacing-xs) 0; color: var(--text-secondary); padding-left: var(--spacing-xl); position: relative; }
.task-list li:before { content: '▪'; position: absolute; left: 0; color: var(--accent-primary); }

/* --- Two column --- */
.two-column {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

/* --- Session preview --- */
.session-preview {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-accent);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}
.preview-emoji { font-size: 1.8rem; }
.preview-subject { font-weight: var(--font-weight-semibold); }
.preview-topic { color: var(--text-secondary); font-size: var(--font-size-sm); }
.preview-time { color: var(--accent-primary); font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold); }

/* --- Session list --- */
.session-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}
.session-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: 8px;
    font-size: var(--font-size-sm);
}
.session-status { font-size: 1.2rem; min-width: 20px; }
.session-info { flex: 1; }
.session-subject { font-weight: var(--font-weight-semibold); }
.session-time { color: var(--text-secondary); font-size: var(--font-size-xs); }

/* --- Schedule --- */
.schedule-mode-toggle {
    display: flex;
    gap: var(--spacing-sm);
    background: var(--bg-secondary);
    padding: var(--spacing-xs);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    flex-wrap: wrap;
}
.mode-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-fast);
}
.mode-btn.active {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
}
.schedule-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}
.schedule-session {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: 8px;
    border-left: 4px solid var(--accent-primary);
}
.schedule-session .session-time-range {
    font-family: var(--font-mono);
    font-weight: var(--font-weight-semibold);
    min-width: 80px;
    color: var(--accent-primary);
}
.schedule-session .session-details-schedule { flex: 1; }
.schedule-session .session-title { font-weight: var(--font-weight-semibold); }
.schedule-session .session-type { font-size: var(--font-size-sm); color: var(--text-secondary); }
.schedule-session .session-edit-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: transparent;
    color: var(--accent-primary);
    border: 1px solid var(--accent-primary);
    border-radius: 6px;
    cursor: pointer;
    font-size: var(--font-size-xs);
    transition: all var(--transition-fast);
}
.schedule-session .session-edit-btn:hover { background: var(--accent-primary); color: white; }
.schedule-session .session-edit-btn.danger { border-color: var(--danger); color: var(--danger); }
.schedule-session .session-edit-btn.danger:hover { background: var(--danger); color: white; }

/* --- Subjects --- */
.subjects-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}
.subject-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    transition: all var(--transition-standard);
    position: relative;
    overflow: hidden;
}
.subject-card:before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: linear-gradient(90deg, var(--accent-primary), var(--accent-tertiary)); }
.subject-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.subject-header { display: flex; align-items: center; gap: var(--spacing-md); margin-bottom: var(--spacing-md); }
.subject-emoji { font-size: 2rem; }
.subject-name { font-weight: var(--font-weight-semibold); font-size: var(--font-size-lg); }
.subject-stat { display: flex; justify-content: space-between; font-size: var(--font-size-sm); margin-bottom: var(--spacing-sm); }
.subject-stat-label { color: var(--text-secondary); }
.subject-stat-value { font-weight: var(--font-weight-semibold); color: var(--accent-primary); }
.progress-bar { width: 100%; height: 6px; background: var(--bg-tertiary); border-radius: 3px; overflow: hidden; margin-top: var(--spacing-xs); }
.progress-fill { height: 100%; background: linear-gradient(90deg, var(--accent-primary), var(--accent-tertiary)); width: 0%; transition: width 0.5s ease; }
.subject-actions { display: flex; gap: var(--spacing-sm); margin-top: var(--spacing-md); padding-top: var(--spacing-md); border-top: 1px solid var(--border-color); }
.subject-btn { flex: 1; padding: var(--spacing-sm); border: none; border-radius: 6px; background: var(--bg-tertiary); color: var(--text-secondary); cursor: pointer; font-size: var(--font-size-xs); font-weight: var(--font-weight-medium); transition: all var(--transition-fast); }
.subject-btn:hover { background: var(--accent-primary); color: white; }

/* --- Progress --- */
.stat-row {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-color);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}
.stat-row:last-child { border-bottom: none; }
.stat-value { font-weight: var(--font-weight-semibold); color: var(--text-primary); }

.discipline-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, rgba(102,126,234,0.1), rgba(118,75,162,0.1));
    border-radius: 8px;
    text-align: center;
}
.discipline-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
}
.discipline-number { font-size: var(--font-size-2xl); font-weight: var(--font-weight-bold); }
.discipline-max { font-size: var(--font-size-sm); opacity: 0.9; }
.discipline-level { font-size: var(--font-size-lg); font-weight: var(--font-weight-semibold); }
.discipline-streak { color: var(--text-secondary); font-size: var(--font-size-sm); }

.subject-progress-list { display: flex; flex-direction: column; gap: var(--spacing-md); }
.subject-progress-item { padding: var(--spacing-md); background: var(--bg-tertiary); border-radius: 8px; border-left: 4px solid var(--accent-primary); }
.subject-progress-name { font-weight: var(--font-weight-semibold); margin-bottom: var(--spacing-sm); }
.progress-bar-container { margin-bottom: var(--spacing-sm); }
.progress-stats { display: grid; grid-template-columns: 1fr 1fr; gap: var(--spacing-sm); font-size: var(--font-size-sm); }
.progress-stat { display: flex; justify-content: space-between; }

.mock-tests-list { margin-top: var(--spacing-lg); display: flex; flex-direction: column; gap: var(--spacing-md); }
.mock-test-item { padding: var(--spacing-md); background: var(--bg-tertiary); border-radius: 8px; border-left: 4px solid var(--warning); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; }
.mock-test-score { font-size: var(--font-size-lg); font-weight: var(--font-weight-bold); color: var(--warning); }

.errors-list { margin-top: var(--spacing-lg); display: flex; flex-direction: column; gap: var(--spacing-md); }
.error-item { padding: var(--spacing-md); background: var(--bg-tertiary); border-radius: 8px; border-left: 4px solid var(--danger); }
.error-subject { font-weight: var(--font-weight-semibold); margin-bottom: var(--spacing-sm); }
.error-label { color: var(--text-secondary); font-size: var(--font-size-sm); font-weight: var(--font-weight-medium); margin-bottom: var(--spacing-xs); }
.error-content { padding: var(--spacing-sm); background: rgba(239,68,68,0.05); border-radius: 6px; border-left: 2px solid var(--danger); color: var(--text-primary); font-size: var(--font-size-sm); margin-bottom: var(--spacing-sm); }
.error-actions { display: flex; gap: var(--spacing-sm); flex-wrap: wrap; }
.error-btn { padding: var(--spacing-xs) var(--spacing-md); border: none; border-radius: 6px; background: var(--success); color: white; cursor: pointer; font-size: var(--font-size-xs); font-weight: var(--font-weight-medium); transition: all var(--transition-fast); }
.error-btn:hover { opacity: 0.9; }
.error-btn.delete { background: var(--danger); }

/* --- Forms --- */
.form-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}
.form-group { display: flex; flex-direction: column; }
.form-group label { font-size: var(--font-size-sm); font-weight: var(--font-weight-medium); margin-bottom: var(--spacing-xs); color: var(--text-primary); }
.form-group input, .form-group select, .form-group textarea {
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    transition: all var(--transition-fast);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(102,126,234,0.2);
}
.form-group textarea { resize: vertical; min-height: 80px; }

.toggle-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) 0;
}
.toggle-item label { margin: 0; flex: 1; }
.toggle-item input[type="checkbox"] { width: 20px; height: 20px; cursor: pointer; }

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: 8px;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-family);
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.btn:active { transform: scale(0.97); }
.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
}
.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}
.btn-secondary:hover { background: var(--bg-accent); border-color: var(--accent-primary); }
.btn-danger {
    background: var(--danger);
    color: white;
}
.btn-large {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--font-size-lg);
    width: 100%;
}
.btn-emoji { font-size: 1.2em; }

/* --- Timer & Modals --- */
.timer-display {
    text-align: center;
    padding: var(--spacing-xl);
    margin: var(--spacing-lg) 0;
    background: linear-gradient(135deg, rgba(102,126,234,0.1), rgba(118,75,162,0.1));
    border-radius: 12px;
    border: 1px solid var(--accent-primary);
}
.timer-value {
    font-family: var(--font-mono);
    font-size: 3.5rem;
    font-weight: var(--font-weight-bold);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-tertiary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
}
.modal-topic { text-align: center; color: var(--text-secondary); font-size: var(--font-size-lg); margin-bottom: var(--spacing-lg); }
.task-display { margin: var(--spacing-md) 0; padding: var(--spacing-md); background: var(--bg-tertiary); border-radius: 8px; border-left: 4px solid var(--accent-primary); }
.task-display ul { list-style: none; }
.task-display li { padding: var(--spacing-xs) 0; color: var(--text-secondary); padding-left: var(--spacing-xl); position: relative; }
.task-display li:before { content: '▪'; position: absolute; left: 0; color: var(--accent-primary); }
.session-controls { display: flex; gap: var(--spacing-md); margin-top: var(--spacing-lg); }
.session-controls .btn { flex: 1; }

.break-suggestions { margin: var(--spacing-lg) 0; }
.suggestions-list {
    list-style: none;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
}
.suggestions-list li {
    padding: var(--spacing-sm);
    background: var(--bg-tertiary);
    border-radius: 8px;
    text-align: center;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.completion-options { display: flex; flex-direction: column; gap: var(--spacing-md); }
.completion-options .btn { width: 100%; }

/* --- Modals --- */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.7);
    z-index: 1000;
    align-items: flex-end;
    justify-content: center;
    padding: var(--spacing-md);
}
.modal.active { display: flex; animation: slideUp var(--transition-standard); }
@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}
.modal-content {
    background: var(--bg-secondary);
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    padding-bottom: var(--spacing-lg);
}
.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    background: var(--bg-secondary);
    z-index: 2;
}
.modal-header h2 { font-size: var(--font-size-xl); margin: 0; flex: 1; }
.modal-close {
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.modal-body { padding: var(--spacing-lg); }

/* --- Notifications --- */
.notification {
    position: fixed;
    bottom: calc(var(--bottom-nav-height) + 16px);
    right: var(--spacing-md);
    left: var(--spacing-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: var(--spacing-md);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    border-left: 4px solid var(--accent-primary);
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition-standard);
    pointer-events: none;
    z-index: 999;
    max-width: 400px;
    margin: 0 auto;
}
.notification.active {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}
.notification.success { border-left-color: var(--success); }
.notification.warning { border-left-color: var(--warning); }
.notification.error { border-left-color: var(--danger); }

/* --- AI Analyzer --- */
.ai-rating { font-size: var(--font-size-2xl); font-weight: var(--font-weight-bold); color: var(--accent-primary); }
.ai-feedback { color: var(--text-secondary); margin-top: var(--spacing-sm); }

/* --- Responsive: Desktop (≥768px) --- */
@media (min-width: 768px) {
    body {
        padding-top: 0;
        padding-bottom: 0;
    }
    .top-app-bar { display: none; }
    .bottom-nav { display: none; }
    .sidebar { display: flex; }
    .app-container {
        padding: var(--spacing-lg);
        gap: var(--spacing-xl);
    }
    .two-column { grid-template-columns: 1fr 1fr; }
    .metrics-grid { grid-template-columns: repeat(4, 1fr); }
    .subjects-grid { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
    .discipline-display { flex-direction: row; text-align: left; }
    .form-grid { grid-template-columns: repeat(2, 1fr); }
    .modal-content { border-radius: var(--border-radius); }
    .modal { align-items: center; }
    .notification {
        bottom: var(--spacing-lg);
        right: var(--spacing-lg);
        left: auto;
    }
}

/* --- Accessibility --- */
:focus-visible { outline: 2px solid var(--accent-primary); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) {
    * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}