/* ================================================================
   SMART REVISION HUB — style.css  v2.0
   Complete Design System: Dark/Light, Toasts, Skeletons,
   Mobile Tab Bar, Animations, All New Components
   ================================================================ */

/* ========== DARK THEME (DEFAULT) ========== */
:root {
    --bg:            #0a0e1a;
    --bg-alt:        #020617;
    --card:          #111827;
    --card-2:        #1a2234;
    --accent:        #6366f1;
    --accent-hover:  #4f46e5;
    --accent-glow:   rgba(99,102,241,0.25);
    --text:          #f1f5f9;
    --text-2:        #cbd5e1;
    --muted:         #94a3b8;
    --dim:           #64748b;
    --glass:         rgba(255,255,255,0.04);
    --glass-2:       rgba(255,255,255,0.08);
    --border:        rgba(255,255,255,0.07);
    --border-accent: rgba(99,102,241,0.45);
    --success:       #10b981;
    --success-bg:    rgba(16,185,129,0.12);
    --danger:        #ef4444;
    --danger-bg:     rgba(239,68,68,0.12);
    --warning:       #f59e0b;
    --warning-bg:    rgba(245,158,11,0.12);
    --info:          #3b82f6;
    --info-bg:       rgba(59,130,246,0.12);
    --sidebar-bg:    #020617;
    --input-bg:      #020617;
    --shadow:        0 25px 60px rgba(0,0,0,0.55);
    --shadow-sm:     0 4px 20px rgba(0,0,0,0.3);
    --shadow-accent: 0 10px 35px rgba(99,102,241,0.35);
    --sk1:           #1a2234;
    --sk2:           #222d42;
    --radius:        16px;
    --radius-sm:     10px;
    --radius-lg:     24px;
    --ease:          cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========== LIGHT THEME ========== */
[data-theme="light"] {
    --bg:            #f0f2ff;
    --bg-alt:        #e4e8f8;
    --card:          #ffffff;
    --card-2:        #f8faff;
    --accent:        #4f46e5;
    --accent-hover:  #4338ca;
    --accent-glow:   rgba(79,70,229,0.15);
    --text:          #0f172a;
    --text-2:        #1e293b;
    --muted:         #475569;
    --dim:           #64748b;
    --glass:         rgba(0,0,0,0.03);
    --glass-2:       rgba(0,0,0,0.06);
    --border:        rgba(0,0,0,0.08);
    --border-accent: rgba(79,70,229,0.4);
    --success:       #059669;
    --success-bg:    rgba(5,150,105,0.1);
    --danger:        #dc2626;
    --danger-bg:     rgba(220,38,38,0.1);
    --warning:       #d97706;
    --warning-bg:    rgba(217,119,6,0.1);
    --info:          #2563eb;
    --info-bg:       rgba(37,99,235,0.1);
    --sidebar-bg:    #ffffff;
    --input-bg:      #f8faff;
    --shadow:        0 25px 60px rgba(0,0,0,0.07);
    --shadow-sm:     0 4px 20px rgba(0,0,0,0.06);
    --shadow-accent: 0 10px 35px rgba(79,70,229,0.2);
    --sk1:           #e2e8f0;
    --sk2:           #f1f5f9;
}

/* ========== GLOBAL RESET ========== */
*, *::before, *::after {
    margin: 0; padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

html { scroll-behavior: smooth; }

body {
    background: var(--bg);
    color: var(--text);
    overflow-x: hidden;
    line-height: 1.6;
    transition: background 0.35s var(--ease), color 0.35s var(--ease);
}

::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--glass-2); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ========== PAGE TRANSITION ========== */
.page-fade-in { animation: pageFadeIn 0.4s var(--ease) both; }

@keyframes pageFadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

.view-enter { animation: viewSlideIn 0.3s var(--ease) both; }

@keyframes viewSlideIn {
    from { opacity: 0; transform: translateX(20px); }
    to   { opacity: 1; transform: translateX(0); }
}

/* ========== OFFLINE BANNER ========== */
#offline-banner {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 9999;
    background: var(--warning);
    color: #000;
    text-align: center;
    padding: 10px 20px;
    font-weight: 700;
    font-size: 0.85rem;
    animation: slideDown 0.3s var(--ease);
}
#offline-banner.show { display: block; }

@keyframes slideDown {
    from { transform: translateY(-100%); }
    to   { transform: translateY(0); }
}

/* ========== TOAST NOTIFICATIONS ========== */
#toast-container {
    position: fixed;
    bottom: 80px;
    right: 20px;
    z-index: 9000;
    display: flex;
    flex-direction: column;
    gap: 10px;
    pointer-events: none;
}

.toast {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 14px 18px;
    min-width: 280px;
    max-width: 360px;
    box-shadow: var(--shadow);
    pointer-events: all;
    animation: toastIn 0.35s var(--ease) both;
    backdrop-filter: blur(12px);
}

.toast.toast-out { animation: toastOut 0.3s var(--ease) both; }

.toast-icon { font-size: 1.1rem; flex-shrink: 0; }
.toast-msg  { font-size: 0.88rem; color: var(--text); flex: 1; font-weight: 500; }
.toast-close { cursor: pointer; color: var(--muted); font-size: 1rem; flex-shrink: 0; line-height: 1; }
.toast-close:hover { color: var(--text); }

.toast-success { border-left: 4px solid var(--success); }
.toast-error   { border-left: 4px solid var(--danger); }
.toast-warning { border-left: 4px solid var(--warning); }
.toast-info    { border-left: 4px solid var(--info); }

@keyframes toastIn {
    from { opacity: 0; transform: translateX(30px); }
    to   { opacity: 1; transform: translateX(0); }
}
@keyframes toastOut {
    from { opacity: 1; transform: translateX(0); }
    to   { opacity: 0; transform: translateX(30px); }
}

/* ========== CUSTOM CONFIRM MODAL ========== */
#confirm-modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 8000;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(6px);
    align-items: center;
    justify-content: center;
}
#confirm-modal.show { display: flex; }

.confirm-box {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 36px;
    width: 90%;
    max-width: 380px;
    text-align: center;
    box-shadow: var(--shadow);
    animation: popIn 0.3s var(--ease) both;
}

@keyframes popIn {
    from { opacity: 0; transform: scale(0.9); }
    to   { opacity: 1; transform: scale(1); }
}

.confirm-icon { font-size: 2.5rem; margin-bottom: 15px; }
.confirm-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.confirm-msg   { color: var(--muted); font-size: 0.88rem; margin-bottom: 25px; line-height: 1.6; }

.confirm-btns { display: flex; gap: 12px; }
.confirm-btns button { flex: 1; padding: 12px; border-radius: var(--radius-sm); font-weight: 700; cursor: pointer; border: none; font-size: 0.9rem; transition: all 0.2s; }
.btn-confirm-cancel  { background: var(--glass-2); color: var(--text); }
.btn-confirm-cancel:hover  { background: var(--glass); }
.btn-confirm-ok      { background: var(--danger); color: white; }
.btn-confirm-ok:hover      { filter: brightness(1.15); }
.btn-confirm-ok.safe { background: var(--accent); }

/* ========== SKELETON LOADERS ========== */
.skeleton { border-radius: var(--radius-sm); background: var(--sk1); position: relative; overflow: hidden; }
.skeleton::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent 25%, var(--sk2) 50%, transparent 75%);
    background-size: 200% 100%;
    animation: shimmer 1.4s infinite;
}

@keyframes shimmer {
    from { background-position: 200% 0; }
    to   { background-position: -200% 0; }
}

.skeleton-card { height: 160px; border-radius: var(--radius); margin-bottom: 15px; }
.skeleton-line { height: 14px; border-radius: 6px; margin-bottom: 10px; }
.skeleton-line.w-75 { width: 75%; }
.skeleton-line.w-50 { width: 50%; }
.skeleton-line.w-30 { width: 30%; }
.skeleton-title { height: 20px; width: 60%; border-radius: 6px; margin-bottom: 12px; }

/* ========== DASHBOARD LAYOUT ========== */
.dashboard { display: flex; min-height: 100vh; }

/* ========== SIDEBAR ========== */
.sidebar {
    width: 260px;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border);
    padding: 28px 18px;
    position: sticky;
    top: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    overflow-x: hidden;
    transition: background 0.35s var(--ease);
    scrollbar-width: none;
    flex-shrink: 0;
}
.sidebar::-webkit-scrollbar { display: none; }

.logo {
    font-size: 1.4rem;
    font-weight: 800;
    margin-bottom: 30px;
    letter-spacing: -0.5px;
    color: var(--text);
}
.logo span { color: var(--accent); }

/* Theme Toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    background: var(--glass);
    border: 1px solid var(--border);
    cursor: pointer;
    margin-bottom: 20px;
    transition: all 0.2s;
    color: var(--muted);
    font-size: 0.82rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    user-select: none;
}
.theme-toggle:hover { background: var(--glass-2); color: var(--text); }
.theme-toggle-track {
    width: 36px; height: 20px;
    background: var(--dim);
    border-radius: 20px;
    position: relative;
    transition: background 0.3s;
    flex-shrink: 0;
}
.theme-toggle-track.on { background: var(--accent); }
.theme-toggle-thumb {
    width: 14px; height: 14px;
    background: white;
    border-radius: 50%;
    position: absolute;
    top: 3px; left: 3px;
    transition: transform 0.3s;
}
.theme-toggle-track.on .theme-toggle-thumb { transform: translateX(16px); }

.side-nav { display: flex; flex-direction: column; gap: 4px; flex: 1; }

.side-nav a {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--muted);
    padding: 11px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.25s var(--ease);
    position: relative;
    white-space: nowrap;
    overflow: hidden;
}
.side-nav a:hover { background: var(--glass-2); color: var(--text); transform: translateX(4px); }
.side-nav a.active { background: var(--accent-glow); color: var(--accent); border-left: 3px solid var(--accent); font-weight: 600; }
.side-nav a .nav-badge {
    margin-left: auto;
    background: var(--danger);
    color: white;
    font-size: 0.62rem;
    font-weight: 800;
    padding: 2px 6px;
    border-radius: 20px;
    min-width: 18px;
    text-align: center;
}

/* ========== MAIN CONTENT ========== */
.main-content { flex: 1; padding: 36px 40px; min-width: 0; overflow-x: hidden; }

.topbar { margin-bottom: 28px; }
.topbar h2 { font-size: 1.75rem; font-weight: 800; margin-bottom: 4px; letter-spacing: -0.5px; }
.topbar p  { color: var(--muted); font-size: 0.9rem; }

/* ========== STATS GRID ========== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 18px;
    margin: 24px 0;
}

.stat-card {
    background: var(--card);
    padding: 22px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s var(--ease);
    position: relative;
    overflow: hidden;
}
.stat-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), transparent);
    opacity: 0;
    transition: opacity 0.3s;
}
.stat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--border-accent); }
.stat-card:hover::before { opacity: 1; }
.stat-card h3 { font-size: 2rem; color: var(--accent); font-weight: 800; margin-bottom: 4px; }
.stat-card p  { color: var(--muted); font-size: 0.82rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; }

/* ========== SECTION TITLE ========== */
.section-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin: 36px 0 18px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
}
.section-title::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
    margin-left: 10px;
}

/* ========== GRID & CARDS ========== */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
    gap: 20px;
}

.card {
    background: var(--card);
    padding: 24px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all 0.3s var(--ease);
    position: relative;
    overflow: hidden;
}
.card:hover { transform: translateY(-6px); border-color: var(--border-accent); box-shadow: var(--shadow-accent); }
.card h3 { margin-bottom: 8px; font-size: 1.1rem; font-weight: 700; }
.card p  { color: var(--muted); font-size: 0.88rem; }

/* ========== BUTTONS ========== */
.btn-sm {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 9px 18px;
    border-radius: var(--radius-sm);
    border: none;
    background: var(--accent);
    color: white;
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.25s var(--ease);
    text-decoration: none;
    white-space: nowrap;
}
.btn-sm:hover { filter: brightness(1.15); transform: translateY(-1px); box-shadow: var(--shadow-accent); }
.btn-sm:active { transform: translateY(0); }
.btn-sm.btn-ghost { background: var(--glass-2); color: var(--text); }
.btn-sm.btn-ghost:hover { background: var(--glass); box-shadow: none; }
.btn-sm.btn-danger { background: var(--danger); }
.btn-sm.btn-success { background: var(--success); }
.btn-sm.btn-warning { background: var(--warning); color: #000; }
.btn-sm:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-auth {
    width: 100%;
    padding: 14px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    margin-top: 10px;
    transition: all 0.25s var(--ease);
    position: relative;
    overflow: hidden;
}
.btn-auth:hover { filter: brightness(1.15); transform: translateY(-2px); box-shadow: var(--shadow-accent); }
.btn-auth:active { transform: translateY(0); }
.btn-auth:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }
.btn-auth.loading::after {
    content: '';
    width: 16px; height: 16px;
    border: 2px solid rgba(255,255,255,0.4);
    border-top-color: white;
    border-radius: 50%;
    display: inline-block;
    animation: spin 0.7s linear infinite;
    margin-left: 10px;
    vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ========== FORMS ========== */
.input-group { text-align: left; margin-bottom: 18px; }
.input-group label { display: block; font-size: 0.83rem; margin-bottom: 7px; color: var(--text-2); font-weight: 600; }

.input-group input,
.input-group select,
.input-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    outline: none;
    transition: all 0.25s;
    font-size: 0.9rem;
    font-family: 'Inter', sans-serif;
}
.input-group input:focus,
.input-group select:focus,
.input-group textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }

/* Password input wrapper */
.pw-wrap { position: relative; }
.pw-wrap input { padding-right: 46px; }
.pw-toggle {
    position: absolute;
    right: 14px; top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    color: var(--muted);
    font-size: 1rem;
    user-select: none;
    transition: color 0.2s;
    background: none; border: none;
}
.pw-toggle:hover { color: var(--accent); }

/* Password strength bar */
.pw-strength { margin-top: 8px; }
.pw-strength-bar {
    height: 4px;
    border-radius: 4px;
    background: var(--border);
    overflow: hidden;
    margin-bottom: 5px;
}
.pw-strength-fill {
    height: 100%;
    border-radius: 4px;
    transition: all 0.4s;
    width: 0%;
}
.pw-strength-fill.weak   { width: 33%; background: var(--danger); }
.pw-strength-fill.medium { width: 66%; background: var(--warning); }
.pw-strength-fill.strong { width: 100%; background: var(--success); }
.pw-strength-label { font-size: 0.72rem; color: var(--muted); }

/* ========== NOTICE CARDS ========== */
.notice-card {
    padding: 20px;
    border-radius: var(--radius);
    margin-bottom: 14px;
    border: 1px solid var(--border);
    transition: all 0.3s;
    position: relative;
}
.notice-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.notice-teacher { background: var(--card); border-left: 5px solid var(--accent); }
.notice-admin   { background: linear-gradient(135deg, rgba(239,68,68,0.08) 0%, var(--card) 100%); border-left: 5px solid var(--danger); }

.notice-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 6px;
    font-size: 0.65rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}
.badge-teacher { background: var(--accent-glow); color: var(--accent); }
.badge-admin   { background: var(--danger-bg); color: var(--danger); border: 1px solid rgba(239,68,68,0.25); }

/* ========== PROGRESS BARS ========== */
.progress-bar-wrap { margin-bottom: 14px; }
.progress-bar-label { display: flex; justify-content: space-between; margin-bottom: 6px; font-size: 0.82rem; font-weight: 600; color: var(--text-2); }
.progress-bar-track { height: 8px; background: var(--glass-2); border-radius: 8px; overflow: hidden; }
.progress-bar-fill  {
    height: 100%;
    border-radius: 8px;
    background: linear-gradient(90deg, var(--accent), #818cf8);
    transition: width 0.8s var(--ease);
}
.progress-bar-fill.green  { background: linear-gradient(90deg, var(--success), #34d399); }
.progress-bar-fill.yellow { background: linear-gradient(90deg, var(--warning), #fcd34d); }
.progress-bar-fill.red    { background: linear-gradient(90deg, var(--danger), #f87171); }

/* ========== STREAK TRACKER ========== */
.streak-row { display: flex; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
.streak-day {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    flex: 1;
    min-width: 36px;
}
.streak-circle {
    width: 36px; height: 36px;
    border-radius: 50%;
    border: 2px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--muted);
    transition: all 0.3s;
}
.streak-circle.done {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
    box-shadow: 0 0 12px var(--accent-glow);
}
.streak-circle.today {
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}
.streak-label { font-size: 0.62rem; color: var(--muted); text-transform: uppercase; font-weight: 700; }

/* ========== RESOURCE TYPE BADGES ========== */
.type-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 9px;
    border-radius: 6px;
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    margin-bottom: 10px;
}
.type-notes   { background: var(--info-bg);    color: var(--info); }
.type-video   { background: var(--danger-bg);  color: var(--danger); }
.type-worksheet { background: var(--success-bg); color: var(--success); }
.type-link    { background: var(--accent-glow); color: var(--accent); }

/* ========== QUIZ STYLES ========== */
.quiz-option {
    width: 100%;
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--card-2);
    color: var(--text);
    text-align: left;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
}
.quiz-option:hover { border-color: var(--accent); background: var(--accent-glow); transform: translateX(4px); }
.quiz-option.correct { border-color: var(--success); background: var(--success-bg); color: var(--success); }
.quiz-option.wrong   { border-color: var(--danger);  background: var(--danger-bg);  color: var(--danger); }
.quiz-option:disabled { cursor: not-allowed; opacity: 0.7; transform: none; }

.quiz-timer-bar { height: 5px; background: var(--border); border-radius: 5px; overflow: hidden; margin-bottom: 20px; }
.quiz-timer-fill { height: 100%; background: linear-gradient(90deg, var(--success), var(--accent)); border-radius: 5px; transition: width 1s linear, background 0.3s; }
.quiz-timer-fill.danger { background: linear-gradient(90deg, var(--warning), var(--danger)); }

/* ========== FLASHCARD ========== */
.flashcard-container { perspective: 1000px; display: flex; flex-direction: column; align-items: center; margin-top: 20px; }
.flashcard { width: 100%; max-width: 440px; height: 260px; position: relative; transform-style: preserve-3d; transition: transform 0.6s var(--ease); cursor: pointer; }
.flashcard.flipped { transform: rotateY(180deg); }
.card-face { position: absolute; width: 100%; height: 100%; backface-visibility: hidden; display: flex; flex-direction: column; align-items: center; justify-content: center; border-radius: var(--radius-lg); padding: 30px; text-align: center; border: 1px solid var(--border); }
.card-front { background: var(--card); color: var(--accent); }
.card-back  { background: linear-gradient(135deg, var(--accent), #818cf8); color: white; transform: rotateY(180deg); }
.card-face small { text-transform: uppercase; letter-spacing: 1px; font-size: 0.65rem; opacity: 0.6; margin-bottom: 12px; }

/* ========== LEADERBOARD TABLE ========== */
.leaderboard-table { width: 100%; border-collapse: collapse; }
.leaderboard-table th { text-align: left; padding: 12px 15px; color: var(--muted); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.5px; border-bottom: 1px solid var(--border); }
.leaderboard-table td { padding: 14px 15px; border-bottom: 1px solid var(--border); font-size: 0.9rem; transition: background 0.2s; }
.leaderboard-table tr:hover td { background: var(--glass); }

/* ========== BOOKING ========== */
.booking-item { background: var(--card-2); border: 1px solid var(--border); padding: 18px; border-radius: var(--radius); margin-bottom: 12px; display: flex; justify-content: space-between; align-items: center; transition: 0.3s; gap: 12px; flex-wrap: wrap; }
.booking-item.approved { border-left: 5px solid var(--success); background: var(--success-bg); }
.booking-item.pending  { border-left: 5px solid var(--warning); }
.booking-status-badge  { font-size: 0.7rem; padding: 4px 10px; border-radius: 20px; font-weight: 800; text-transform: uppercase; }
.status-approved { background: var(--success-bg); color: var(--success); border: 1px solid rgba(16,185,129,0.3); }
.status-pending  { background: var(--warning-bg); color: var(--warning); border: 1px solid rgba(245,158,11,0.3); }
.status-declined { background: var(--danger-bg);  color: var(--danger);  border: 1px solid rgba(239,68,68,0.3); }

.countdown-badge { font-size: 0.75rem; font-weight: 700; color: var(--success); margin-top: 4px; }

/* ========== AI TUTOR ========== */
#ai-tutor-container { position: fixed; bottom: 20px; right: 20px; z-index: 1000; }
#tutor-toggle { background: var(--accent); color: white; border: none; padding: 13px 22px; border-radius: 50px; font-weight: 700; cursor: pointer; box-shadow: var(--shadow-accent); display: flex; align-items: center; gap: 8px; font-size: 0.9rem; transition: all 0.25s; }
#tutor-toggle:hover { filter: brightness(1.1); transform: translateY(-2px); }

#tutor-window { display: none; width: 330px; height: 460px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg); flex-direction: column; overflow: hidden; margin-bottom: 14px; box-shadow: var(--shadow); }

#tutor-header { background: var(--accent); color: white; padding: 14px 16px; font-weight: 800; font-size: 0.88rem; display: flex; justify-content: space-between; align-items: center; }
#tutor-header span:last-child { cursor: pointer; font-size: 1.1rem; opacity: 0.8; }
#tutor-header span:last-child:hover { opacity: 1; }

#chat-history { flex: 1; padding: 14px; overflow-y: auto; display: flex; flex-direction: column; gap: 10px; background: var(--bg); scrollbar-width: thin; }

.msg { padding: 10px 14px; border-radius: 14px; max-width: 85%; font-size: 0.83rem; line-height: 1.55; }
.msg-ai   { background: var(--card); color: var(--text-2); align-self: flex-start; border-bottom-left-radius: 4px; border: 1px solid var(--border); }
.msg-user { background: var(--accent); color: white; align-self: flex-end; border-bottom-right-radius: 4px; }

.typing-indicator { display: flex; gap: 4px; align-items: center; padding: 12px 14px; background: var(--card); border-radius: 14px; border-bottom-left-radius: 4px; align-self: flex-start; border: 1px solid var(--border); }
.typing-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--muted); animation: typingBounce 1.2s infinite; }
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes typingBounce { 0%, 60%, 100% { transform: translateY(0); } 30% { transform: translateY(-6px); } }

.tutor-suggestions { padding: 10px 14px; display: flex; gap: 7px; flex-wrap: wrap; border-top: 1px solid var(--border); background: var(--card); }
.suggestion-chip { padding: 5px 11px; border-radius: 20px; background: var(--accent-glow); color: var(--accent); font-size: 0.75rem; font-weight: 600; cursor: pointer; border: 1px solid rgba(99,102,241,0.2); transition: all 0.2s; white-space: nowrap; }
.suggestion-chip:hover { background: var(--accent); color: white; }

#tutor-footer { padding: 10px; background: var(--card); border-top: 1px solid var(--border); display: flex; gap: 7px; }
#tutor-input { flex: 1; background: var(--bg-alt, var(--bg)); border: 1px solid var(--border); color: var(--text); padding: 9px 13px; border-radius: var(--radius-sm); outline: none; font-size: 0.85rem; font-family: 'Inter', sans-serif; transition: border-color 0.2s; }
#tutor-input:focus { border-color: var(--accent); }
#tutor-send { background: var(--accent); color: white; border: none; padding: 9px 14px; border-radius: var(--radius-sm); cursor: pointer; font-size: 1rem; transition: all 0.2s; }
#tutor-send:hover { filter: brightness(1.1); }

/* ========== TIMER BOX ========== */
.timer-box { margin-bottom: 20px; padding: 14px; background: var(--glass); border-radius: var(--radius-sm); border: 1px solid var(--border); }
.timer-display { font-size: 1.5rem; font-weight: 800; color: var(--accent); font-variant-numeric: tabular-nums; }
.timer-label { font-size: 0.62rem; color: var(--muted); text-transform: uppercase; font-weight: 700; letter-spacing: 0.5px; margin-bottom: 6px; }

/* ========== GAP ANALYSIS CARDS ========== */
.gap-card { padding: 15px; border-radius: var(--radius-sm); background: var(--card-2); border-left: 4px solid var(--muted); }
.gap-card.mastered  { border-left-color: var(--success); }
.gap-card.learning  { border-left-color: var(--warning); }
.gap-card.struggling { border-left-color: var(--danger); }
.gap-card small { font-size: 0.65rem; color: var(--muted); text-transform: uppercase; font-weight: 700; }
.gap-card h4 { margin: 5px 0; font-size: 0.95rem; }
.gap-card .gap-score { font-size: 1.4rem; font-weight: 800; }

/* ========== ONLINE STATUS ========== */
.status-dot { width: 8px; height: 8px; background: var(--success); border-radius: 50%; box-shadow: 0 0 8px var(--success); display: inline-block; flex-shrink: 0; }
@keyframes pulse-dot { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.5; transform: scale(1.3); } }
.status-dot.pulse { animation: pulse-dot 1.8s infinite; }

.online-pill { display: flex; align-items: center; gap: 9px; padding: 9px 12px; background: var(--success-bg); border: 1px solid rgba(16,185,129,0.2); border-radius: var(--radius-sm); transition: 0.3s; }
.online-pill:hover { background: rgba(16,185,129,0.15); }

/* ========== NOTIFICATION BADGE ========== */
.notification-badge {
    position: absolute;
    top: -3px; right: 4px;
    background: var(--danger);
    color: white;
    font-size: 0.6rem;
    font-weight: 800;
    border-radius: 50%;
    padding: 2px 5px;
    min-width: 17px;
    height: 17px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--sidebar-bg);
    z-index: 10;
}

/* ========== SESSION TIMEOUT MODAL ========== */
#session-modal {
    display: none;
    position: fixed; inset: 0;
    z-index: 8500;
    background: rgba(0,0,0,0.75);
    backdrop-filter: blur(6px);
    align-items: center;
    justify-content: center;
}
#session-modal.show { display: flex; }
.session-box { background: var(--card); border: 1px solid var(--warning); border-radius: var(--radius-lg); padding: 36px; max-width: 360px; width: 90%; text-align: center; box-shadow: var(--shadow); }
.session-countdown { font-size: 2.5rem; font-weight: 800; color: var(--warning); margin: 15px 0; font-variant-numeric: tabular-nums; }

/* ========== INQUIRY STYLES ========== */
.inquiry-card { background: var(--card-2); border-radius: var(--radius); padding: 20px; border: 1px solid var(--border); transition: 0.3s; }
.inquiry-card.answered { border-left: 4px solid var(--success); }
.inquiry-card.pending  { border-left: 4px solid var(--warning); }
.inquiry-textarea { width: 100%; background: var(--input-bg); border: 1px solid var(--border); color: var(--text); padding: 13px; border-radius: var(--radius-sm); font-family: 'Inter', sans-serif; resize: vertical; outline: none; transition: border-color 0.2s; font-size: 0.88rem; }
.inquiry-textarea:focus { border-color: var(--accent); }

/* ========== HOMEPAGE ========== */
.navbar-home {
    display: flex; justify-content: space-between; align-items: center;
    padding: 18px 8%; background: rgba(10,14,26,0.92);
    backdrop-filter: blur(14px); position: sticky; top: 0; z-index: 2000;
    border-bottom: 1px solid var(--border);
    transition: background 0.35s;
}
[data-theme="light"] .navbar-home { background: rgba(240,242,255,0.92); }

.nav-links { display: flex; list-style: none; align-items: center; gap: 28px; }
.nav-links a { text-decoration: none; color: var(--muted); font-weight: 500; font-size: 0.92rem; transition: color 0.25s; }
.nav-links a:hover { color: var(--accent); }
.btn-login-nav    { color: var(--text) !important; }
.btn-register-nav { background: var(--accent); color: white !important; padding: 8px 20px; border-radius: var(--radius-sm); box-shadow: var(--shadow-accent); }

.hero-home { padding: 110px 6% 80px; text-align: center; background: radial-gradient(ellipse at center, rgba(99,102,241,0.12) 0%, transparent 70%); }
.motto { color: var(--accent); text-transform: uppercase; letter-spacing: 3px; font-size: 0.75rem; font-weight: 800; margin-bottom: 16px; }
.hero-home h1 { font-size: 3.8rem; margin-bottom: 22px; font-weight: 800; letter-spacing: -1.5px; background: linear-gradient(135deg, #fff 0%, #94a3b8 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
[data-theme="light"] .hero-home h1 { background: linear-gradient(135deg, var(--accent) 0%, #0f172a 100%); }
.description { max-width: 680px; margin: 0 auto 44px; color: var(--muted); font-size: 1.08rem; line-height: 1.8; }
.hero-btns { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }

.btn-primary-home { background: var(--accent); color: white; padding: 14px 34px; border-radius: var(--radius-sm); text-decoration: none; font-weight: 700; box-shadow: var(--shadow-accent); transition: all 0.25s; }
.btn-secondary-home { border: 1px solid var(--border); color: var(--text); padding: 14px 34px; border-radius: var(--radius-sm); text-decoration: none; font-weight: 600; transition: all 0.25s; }
.btn-primary-home:hover   { filter: brightness(1.1); transform: translateY(-3px); }
.btn-secondary-home:hover { background: var(--glass-2); }

/* ========== AUTH PAGES ========== */
.auth-page { display: flex; justify-content: center; align-items: center; min-height: 100vh; background: radial-gradient(ellipse at bottom right, rgba(99,102,241,0.2) 0%, var(--bg) 60%); }
.auth-container { width: 100%; max-width: 420px; padding: 20px; }
.auth-card { background: var(--card); padding: 42px; border-radius: var(--radius-lg); border: 1px solid var(--border); text-align: center; box-shadow: var(--shadow); }
.auth-card h2 { margin: 14px 0 8px; font-size: 1.6rem; font-weight: 800; letter-spacing: -0.5px; }
.auth-card > p { color: var(--muted); font-size: 0.88rem; margin-bottom: 28px; }
.auth-footer { margin-top: 22px; font-size: 0.83rem; color: var(--muted); }
.auth-footer a { color: var(--accent); text-decoration: none; font-weight: 600; }
.auth-footer a:hover { text-decoration: underline; }
.forgot-link { display: block; margin-top: 10px; }

/* Remember me checkbox */
.remember-row { display: flex; align-items: center; gap: 9px; text-align: left; margin: 6px 0 14px; }
.remember-row input[type="checkbox"] { width: 16px; height: 16px; accent-color: var(--accent); cursor: pointer; }
.remember-row label { font-size: 0.83rem; color: var(--muted); cursor: pointer; }

/* ========== CBE SELECT STYLING ========== */
optgroup { background: var(--card); color: var(--accent); font-weight: 700; }
option   { background: var(--input-bg); color: var(--text); }

/* ========== UTILITY ========== */
.main-container { padding: 60px 5%; max-width: 1200px; margin: 0 auto; }
.icon { font-size: 2rem; margin-bottom: 15px; }
.footer { text-align: center; padding: 40px; border-top: 1px solid var(--border); color: var(--muted); font-size: 0.8rem; }
.footer-content { max-width: 600px; margin: 0 auto; }
.footer-content h3 { color: var(--accent); margin-bottom: 15px; }
.copyright { margin-top: 20px; opacity: 0.4; }

/* ========== CHART CONTAINER ========== */
.chart-container { position: relative; margin: 12px auto; height: 160px; width: 160px; }

/* ========== QUOTE CARD ========== */
.quote-card {
    background: linear-gradient(135deg, rgba(99,102,241,0.08), var(--card));
    border: 1px solid rgba(99,102,241,0.2);
    border-left: 5px solid var(--accent);
    border-radius: var(--radius);
    padding: 20px 24px;
    margin-bottom: 24px;
    position: relative;
    overflow: hidden;
}
.quote-card::before { content: '"'; position: absolute; top: -10px; right: 20px; font-size: 6rem; color: var(--accent); opacity: 0.07; font-family: Georgia, serif; }
.quote-card p { font-style: italic; color: var(--text-2); font-size: 0.92rem; line-height: 1.7; }
.quote-card cite { display: block; margin-top: 8px; color: var(--muted); font-size: 0.78rem; font-weight: 700; }

/* ========== CONTINUE CARD ========== */
.continue-card { background: linear-gradient(135deg, rgba(99,102,241,0.15), var(--card)); border: 1px solid var(--border-accent); border-radius: var(--radius); padding: 20px; display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-bottom: 24px; flex-wrap: wrap; transition: 0.3s; }
.continue-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-accent); }

/* ========== MOBILE BOTTOM TAB BAR ========== */

/* ========== HAMBURGER (HOME PAGE) ========== */
.menu-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; }
.menu-toggle span { width: 24px; height: 2.5px; background: var(--text); transition: 0.3s; border-radius: 2px; }
.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 6px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -6px); }

/* ========== ADMIN / TEACHER SPECIFIC ========== */
.user-row { display: flex; flex-direction: column; padding: 15px; border-bottom: 1px solid var(--border); gap: 10px; }
.row-info  { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.actions   { display: flex; gap: 8px; flex-wrap: wrap; }

.role-badge { display: inline-block; padding: 3px 10px; border-radius: 20px; font-size: 0.68rem; font-weight: 800; text-transform: uppercase; background: var(--accent-glow); color: var(--accent); }

.admin-stat-bar { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; padding: 20px; background: var(--card); border-radius: var(--radius); border: 1px solid var(--border); margin-bottom: 28px; }
.admin-stat-item { text-align: center; }
.admin-stat-item h4 { font-size: 1.8rem; font-weight: 800; color: var(--accent); }
.admin-stat-item p  { font-size: 0.72rem; color: var(--muted); text-transform: uppercase; font-weight: 700; letter-spacing: 0.5px; }
.admin-stat-item.danger h4 { color: var(--danger); }
.admin-stat-item.warning h4 { color: var(--warning); }
.admin-stat-item.success h4 { color: var(--success); }

.history-table { width: 100%; border-collapse: collapse; }
.history-table th { text-align: left; padding: 12px 15px; color: var(--muted); font-size: 0.76rem; text-transform: uppercase; letter-spacing: 0.5px; border-bottom: 1px solid var(--border); }
.history-table td { padding: 13px 15px; border-bottom: 1px solid var(--border); font-size: 0.88rem; }
.history-table tr:hover td { background: var(--glass); }

/* Quill editor overrides */
.ql-toolbar { background: var(--card-2); border-color: var(--border) !important; border-radius: var(--radius-sm) var(--radius-sm) 0 0; }
.ql-container { background: var(--input-bg); border-color: var(--border) !important; border-radius: 0 0 var(--radius-sm) var(--radius-sm); color: var(--text); min-height: 100px; }
.ql-toolbar .ql-stroke { stroke: var(--muted); }
.ql-toolbar .ql-fill   { fill:   var(--muted); }
.ql-toolbar button:hover .ql-stroke { stroke: var(--accent); }
[data-theme="light"] .ql-toolbar { background: var(--bg-alt, #f1f5f9); }

/* ========== FLATPICKR OVERRIDES ========== */
.flatpickr-calendar { background: var(--card) !important; border: 1px solid var(--border) !important; border-radius: var(--radius) !important; box-shadow: var(--shadow) !important; }
.flatpickr-day { color: var(--text) !important; border-radius: var(--radius-sm) !important; }
.flatpickr-day.selected, .flatpickr-day.selected:hover { background: var(--accent) !important; border-color: var(--accent) !important; }
.flatpickr-day:hover { background: var(--glass-2) !important; }
.flatpickr-months .flatpickr-month { color: var(--text) !important; background: transparent !important; }
.flatpickr-current-month input.cur-year { color: var(--text) !important; }
.flatpickr-weekday { color: var(--muted) !important; background: transparent !important; }
.numInputWrapper span { border-color: var(--border) !important; }
.numInputWrapper span svg path { fill: var(--muted) !important; }

/* ========== EMPTY STATE ========== */
.empty-state { text-align: center; padding: 50px 20px; color: var(--muted); }
.empty-state .empty-icon { font-size: 3.5rem; margin-bottom: 15px; opacity: 0.5; }
.empty-state p { font-size: 0.9rem; }

/* ========== VIDEO CONTAINER ========== */
#video-container { width: 100%; height: 560px; background: #000; border-radius: var(--radius); overflow: hidden; margin-top: 20px; border: 1px solid var(--border); }
#video-container-admin { width: 100%; height: 560px; background: #000; border-radius: var(--radius); overflow: hidden; margin-top: 20px; border: 1px solid var(--border); }

/* ========== SEARCH BAR ========== */
.search-bar { position: relative; margin-bottom: 18px; }
.search-bar input { width: 100%; padding: 11px 16px 11px 42px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); font-size: 0.88rem; outline: none; transition: border-color 0.2s; }
.search-bar input:focus { border-color: var(--accent); }
.search-bar .search-icon { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); color: var(--muted); font-size: 0.95rem; pointer-events: none; }

.filter-row { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 16px; }
.filter-chip { padding: 6px 14px; border-radius: 20px; border: 1px solid var(--border); background: var(--card-2); color: var(--muted); font-size: 0.78rem; font-weight: 600; cursor: pointer; transition: all 0.2s; }
.filter-chip:hover, .filter-chip.active { background: var(--accent); color: white; border-color: var(--accent); }

/* ========== RESPONSE AREA (admin/teacher) ========== */
.response-area { width: 100%; margin-top: 10px; background: var(--input-bg); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); padding: 12px; font-family: 'Inter', sans-serif; resize: vertical; outline: none; font-size: 0.87rem; transition: border-color 0.2s; }
.response-area:focus { border-color: var(--accent); }

/* ========== MODAL (edit user / general) ========== */
.modal { display: none; position: fixed; z-index: 7000; inset: 0; background: rgba(0,0,0,0.8); backdrop-filter: blur(8px); align-items: center; justify-content: center; }
.modal.show { display: flex; }
.modal-content { background: var(--card); padding: 32px; border-radius: var(--radius-lg); width: 90%; max-width: 460px; border: 1px solid var(--border); max-height: 90vh; overflow-y: auto; box-shadow: var(--shadow); animation: popIn 0.3s var(--ease) both; }

/* ========== RADIO ROLE OPTIONS ========== */
.role-selection-group { display: flex; flex-direction: column; gap: 10px; margin-top: 8px; }
.role-option { display: flex; align-items: center; gap: 12px; background: var(--glass); padding: 12px; border-radius: var(--radius-sm); border: 1px solid var(--border); cursor: pointer; transition: all 0.2s; }
.role-option:has(input:checked) { border-color: var(--accent); background: var(--accent-glow); }
.role-option input  { cursor: pointer; accent-color: var(--accent); }
.role-option label  { cursor: pointer; margin: 0; flex: 1; font-size: 0.88rem; }

/* ========== QUIZ ADMIN / QUESTION BUILDER ========== */
.question-block { background: var(--card-2); padding: 16px; border-radius: var(--radius-sm); margin-bottom: 14px; border: 1px solid var(--border); }
.option-input { display: flex; align-items: center; gap: 10px; margin-top: 7px; }
.option-input input[type="text"] { flex: 1; padding: 8px 12px; background: var(--input-bg); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-family: 'Inter', sans-serif; outline: none; }
.option-input input[type="text"]:focus { border-color: var(--accent); }

/* ========== ASSIGNMENT / QUIZ ADMIN CARDS ========== */
.assign-card { border-left: 4px solid var(--info); }
.quiz-card   { border-left: 4px solid var(--accent); }

/* ========== BOOKING STATUS TIMELINE ========== */
.status-timeline { display: flex; align-items: center; gap: 6px; margin-top: 8px; }
.timeline-step { flex: 1; text-align: center; position: relative; }
.timeline-step .step-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--dim); margin: 0 auto 4px; }
.timeline-step.done .step-dot { background: var(--success); box-shadow: 0 0 8px rgba(16,185,129,0.4); }
.timeline-step.current .step-dot { background: var(--accent); box-shadow: 0 0 8px var(--accent-glow); }
.timeline-step p { font-size: 0.6rem; color: var(--muted); font-weight: 700; text-transform: uppercase; }
.timeline-line { flex: 1; height: 2px; background: var(--border); }
.timeline-line.done { background: var(--success); }

/* ================================================================
   MOBILE DRAWER — for admin & teacher panels (no tab bar)
   ================================================================ */
.mobile-topbar {
    display: none;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    background: var(--sidebar-bg);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 300;
}
.mobile-topbar .logo { font-size: 1.1rem; font-weight: 800; color: var(--text); }
.mobile-topbar .logo span { color: var(--accent); }
.hamburger-btn {
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding: 4px;
}
.hamburger-btn span { width: 22px; height: 2.5px; background: var(--text); border-radius: 2px; transition: 0.3s; display: block; }
.hamburger-btn.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger-btn.open span:nth-child(2) { opacity: 0; }
.hamburger-btn.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Slide-in drawer overlay */
.drawer-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.55);
    z-index: 400;
    backdrop-filter: blur(3px);
}
.drawer-overlay.show { display: block; }

/* Drawer sidebar */
.sidebar.drawer {
    position: fixed;
    top: 0; left: 0;
    height: 100vh;
    z-index: 500;
    transform: translateX(-100%);
    transition: transform 0.32s cubic-bezier(0.4,0,0.2,1);
    overflow-y: auto;
    display: flex !important;   /* always in DOM, hidden via transform */
    box-shadow: 4px 0 30px rgba(0,0,0,0.4);
}
.sidebar.drawer.open { transform: translateX(0); }

/* ================================================================
   RESPONSIVE — TABLET  (≤ 900px)
   ================================================================ */
@media (max-width: 900px) {

    /* ── Dashboard layout ── */
    .dashboard { flex-direction: column; }

    /* Hide the static sidebar — drawer takes over */
    .sidebar:not(.drawer) { display: none; }

    /* Main content: full width, bottom padding for tab bar */
    .main-content {
        padding: 18px 16px 100px;
        width: 100%;
        min-width: 0;
        overflow-x: hidden;
    }

    /* Show mobile tab bar */

    /* Show mobile topbar for admin / teacher panels */
    .mobile-topbar { display: flex; }

    /* AI tutor & toasts above tab bar */
    #ai-tutor-container { bottom: 80px; right: 12px; }
    #toast-container    { bottom: 88px; right: 12px; }

    /* ── Topbar ── */
    .topbar { margin-bottom: 18px; }
    .topbar h2 { font-size: 1.4rem; }
    .topbar p  { font-size: 0.82rem; }

    /* ── Grids ── */
    .grid            { grid-template-columns: 1fr; gap: 14px; }
    .stats-grid      { grid-template-columns: 1fr 1fr; gap: 14px; }
    .analytics-grid  { grid-template-columns: 1fr 1fr; gap: 12px; }
    .features-grid   { grid-template-columns: 1fr; }
    .roles-grid      { grid-template-columns: 1fr; }
    .counters-grid   { grid-template-columns: repeat(2, 1fr); gap: 20px; }
    .testimonials-grid { grid-template-columns: 1fr; }
    .personal-best-row { grid-template-columns: repeat(3, 1fr); }
    .admin-stat-bar  { grid-template-columns: repeat(2, 1fr); }

    /* ── Section title ── */
    .section-title { font-size: 1rem; margin: 24px 0 14px; }
    .section-title::after { display: none; }

    /* ── Cards ── */
    .card { padding: 18px; border-radius: 14px; }
    .stat-card { padding: 16px; }
    .stat-card h3 { font-size: 1.6rem; }

    /* ── Booking items ── */
    .booking-item { flex-direction: column; align-items: flex-start; gap: 14px; }
    .booking-item > div:last-child { width: 100%; display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }

    /* ── Row info (admin user rows) ── */
    .row-info { flex-wrap: wrap; gap: 8px; }
    .actions  { flex-wrap: wrap; }

    /* ── Tables: horizontal scroll ── */
    .history-table,
    .leaderboard-table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; white-space: nowrap; }

    /* ── Video containers ── */
    #video-container,
    #video-container-admin { height: 280px; }

    /* ── AI tutor window ── */
    #tutor-window { width: calc(100vw - 28px); }

    /* ── Flashcard ── */
    .flashcard { height: 220px; }

    /* ── Performance header ── */
    .performance-header { flex-direction: column; align-items: flex-start; gap: 10px; }
    .performance-header .section-title { margin: 0; }

    /* ── Continue card ── */
    .continue-card { flex-direction: column; align-items: flex-start; }

    /* ── Status timeline ── */
    .status-timeline { display: none; } /* too cramped on mobile */

    /* ── Filter row ── */
    .filter-row { overflow-x: auto; flex-wrap: nowrap; padding-bottom: 6px; scrollbar-width: none; }
    .filter-row::-webkit-scrollbar { display: none; }
    .filter-chip { flex-shrink: 0; }

    /* ── Steps grid (how it works) ── */
    .steps-grid { grid-template-columns: 1fr 1fr; gap: 20px; }

    /* ── Footer ── */
    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .footer-bottom { flex-direction: column; text-align: center; }
}

/* ================================================================
   RESPONSIVE — PHONE  (≤ 600px)
   ================================================================ */
@media (max-width: 600px) {

    /* ── Auth pages ── */
    .auth-card { padding: 26px 18px; border-radius: 18px; }
    .auth-card h2 { font-size: 1.35rem; }

    /* ── Hero ── */
    .hero-home h1 { font-size: 2rem; letter-spacing: -1px; }
    .hero-home .description { font-size: 0.95rem; }
    .hero-btns { flex-direction: column; align-items: stretch; }
    .hero-btns a { text-align: center; }
    .hero-stats { gap: 16px; }
    .hero-divider { display: none; }

    /* ── Grids further collapse ── */
    .stats-grid        { grid-template-columns: 1fr; }
    .analytics-grid    { grid-template-columns: 1fr; }
    .personal-best-row { grid-template-columns: 1fr 1fr 1fr; gap: 8px; }
    .admin-stat-bar    { grid-template-columns: 1fr 1fr; }
    .steps-grid        { grid-template-columns: 1fr; }
    .counters-grid     { grid-template-columns: 1fr 1fr; }

    /* ── Stat card numbers ── */
    .stat-card h3  { font-size: 1.5rem; }
    .pb-card .pb-val { font-size: 1.3rem; }
    .pb-card { padding: 10px 8px; }
    .pb-card .pb-label { font-size: 0.6rem; }

    /* ── Topbar ── */
    .topbar h2 { font-size: 1.25rem; }

    /* ── Main content ── */
    .main-content { padding: 14px 13px 100px; }

    /* ── Section title ── */
    .section-title { font-size: 0.95rem; }

    /* ── Cards ── */
    .card { padding: 16px; border-radius: 12px; }
    .card h3 { font-size: 1rem; }

    /* ── Confirm modal ── */
    .confirm-box { padding: 24px 16px; }
    .confirm-title { font-size: 1rem; }

    /* ── Session modal ── */
    .session-box { padding: 28px 18px; }
    .session-countdown { font-size: 2rem; }

    /* ── Tutor ── */
    #tutor-window { width: calc(100vw - 22px); height: 420px; }
    #tutor-toggle { padding: 11px 16px; font-size: 0.82rem; }

    /* ── Quiz ── */
    .quiz-option { padding: 12px 14px; font-size: 0.85rem; }

    /* ── Flashcard ── */
    .flashcard { height: 200px; max-width: 100%; }
    .card-face  { padding: 20px; }

    /* ── Booking ── */
    .booking-status-badge { font-size: 0.65rem; }
    .countdown-badge      { font-size: 0.7rem; }

    /* ── Form buttons ── */
    .btn-auth { padding: 13px; font-size: 0.9rem; }
    .btn-sm   { padding: 8px 14px; font-size: 0.8rem; }

    /* ── Admin user rows ── */
    .user-row   { padding: 12px; }
    .role-badge { font-size: 0.62rem; }

    /* ── Nav (homepage) ── */
    .menu-toggle { display: flex; }
    .nav-links {
        display: none;
        flex-direction: column;
        position: fixed;
        top: 60px; left: 0;
        width: 100%;
        background: var(--bg);
        padding: 28px 20px;
        gap: 18px;
        border-bottom: 1px solid var(--border);
        z-index: 2000;
        box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    }
    .nav-links.show { display: flex; }

    /* ── History / leaderboard tables ── */
    .history-table th,
    .history-table td,
    .leaderboard-table th,
    .leaderboard-table td { padding: 10px 10px; font-size: 0.78rem; }

    /* ── Video ── */
    #video-container,
    #video-container-admin { height: 220px; border-radius: 10px; }

    /* ── Mobile topbar ── */
    .mobile-topbar { padding: 12px 14px; }
    .mobile-topbar .logo { font-size: 1rem; }

    /* ── Section headings (homepage) ── */
    .section-center h2 { font-size: 1.6rem; }
    .section-center p  { font-size: 0.88rem; }

    /* ── Role cards ── */
    .role-card { padding: 24px 20px; }
    .role-emoji { font-size: 2.4rem; }

    /* ── Testimonials ── */
    .testimonial-card { padding: 20px; }

    /* ── Tab bar labels ── */

    /* ── Gap cards ── */
    .gap-card { padding: 12px; }
    .gap-card .gap-score { font-size: 1.2rem; }

    /* ── Notice cards ── */
    .notice-card { padding: 16px; }

    /* ── Inquiry card ── */
    .inquiry-card { padding: 14px; }

    /* ── Streak circles ── */
    .streak-circle { width: 30px; height: 30px; font-size: 0.65rem; }
    .streak-label  { font-size: 0.55rem; }

    /* ── Chart container ── */
    .chart-container { height: 130px; width: 130px; }

    /* ── Admin stat bar numbers ── */
    .admin-stat-item h4 { font-size: 1.5rem; }
    .admin-stat-item p  { font-size: 0.65rem; }

    /* ── Booking card ── */
    .booking-item { padding: 14px; }

    /* ── Quote card ── */
    .quote-card { padding: 16px 18px; }
    .quote-card p { font-size: 0.85rem; }
}