/* ============================================================
   QUIZ APP - Main Stylesheet
   Design: Dark glassmorphism with electric accent
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=DM+Sans:wght@300;400;500&display=swap');

/* ── CSS Variables ─────────────────────────────────────────── */
:root {
    --bg-base:       #080b14;
    --bg-card:       rgba(255,255,255,0.05);
    --bg-card-hover: rgba(255,255,255,0.08);
    --border:        rgba(255,255,255,0.1);
    --accent:        #6c63ff;
    --accent-2:      #ff6584;
    --accent-3:      #43e97b;
    --text-primary:  #f0f0ff;
    --text-muted:    #8b8fa8;
    --success:       #43e97b;
    --danger:        #ff6584;
    --warning:       #ffd166;
    --shadow:        0 8px 32px rgba(0,0,0,0.4);
    --radius:        16px;
    --radius-sm:     10px;
    --transition:    all 0.25s cubic-bezier(0.4,0,0.2,1);
    --glow:          0 0 40px rgba(108,99,255,0.25);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'DM Sans', sans-serif;
    background: var(--bg-base);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

/* ── Animated Background ───────────────────────────────────── */
body::before {
    content: '';
    position: fixed;
    top: -50%; left: -50%;
    width: 200%; height: 200%;
    background:
        radial-gradient(circle at 20% 20%, rgba(108,99,255,0.12) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255,101,132,0.08) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(67,233,123,0.04) 0%, transparent 60%);
    animation: bgShift 15s ease-in-out infinite alternate;
    z-index: -1;
    pointer-events: none;
}

@keyframes bgShift {
    0%   { transform: translate(0,0) rotate(0deg); }
    100% { transform: translate(3%,3%) rotate(5deg); }
}

/* ── Typography ────────────────────────────────────────────── */
h1, h2, h3, h4, h5 {
    font-family: 'Syne', sans-serif;
    font-weight: 700;
    letter-spacing: -0.02em;
}

a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--text-primary); }

/* ── Auth Pages (signup / login) ───────────────────────────── */
.auth-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.auth-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 2.5rem;
    width: 100%;
    max-width: 460px;
    box-shadow: var(--shadow), var(--glow);
    animation: slideUp 0.5s cubic-bezier(0.4,0,0.2,1);
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to   { opacity: 1; transform: translateY(0); }
}

.auth-logo {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-logo .logo-icon {
    width: 60px; height: 60px;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    margin-bottom: 0.75rem;
    box-shadow: 0 8px 24px rgba(108,99,255,0.4);
}

.auth-logo h2 { font-size: 1.8rem; }
.auth-logo p { color: var(--text-muted); font-size: 0.9rem; margin-top: 0.25rem; }

/* ── Form Controls ─────────────────────────────────────────── */
.form-group {
    margin-bottom: 1.2rem;
    position: relative;
}

.form-group label {
    display: block;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.form-control {
    width: 100%;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    font-family: 'DM Sans', sans-serif;
    font-size: 0.95rem;
    transition: var(--transition);
    outline: none;
}

.form-control:focus {
    border-color: var(--accent);
    background: rgba(108,99,255,0.08);
    box-shadow: 0 0 0 3px rgba(108,99,255,0.2);
}

.form-control::placeholder { color: var(--text-muted); }

select.form-control option { background: #1a1f35; color: var(--text-primary); }

/* ── Buttons ───────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-sm);
    font-family: 'Syne', sans-serif;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255,255,255,0);
    transition: var(--transition);
}

.btn:hover::after { background: rgba(255,255,255,0.08); }

.btn-primary {
    background: linear-gradient(135deg, var(--accent), #8b80ff);
    color: #fff;
    width: 100%;
    box-shadow: 0 4px 20px rgba(108,99,255,0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(108,99,255,0.5);
}

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

.btn-danger {
    background: linear-gradient(135deg, var(--danger), #ff8fa3);
    color: #fff;
}

.btn-success {
    background: linear-gradient(135deg, var(--success), #20bf55);
    color: #1a1a2e;
    font-weight: 700;
}

.btn-sm { padding: 0.4rem 0.9rem; font-size: 0.8rem; }
.btn-lg { padding: 1rem 2rem; font-size: 1.05rem; }

/* ── Divider ───────────────────────────────────────────────── */
.auth-divider {
    text-align: center;
    margin: 1.5rem 0;
    color: var(--text-muted);
    font-size: 0.85rem;
    position: relative;
}

.auth-divider::before, .auth-divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 42%;
    height: 1px;
    background: var(--border);
}

.auth-divider::before { left: 0; }
.auth-divider::after  { right: 0; }

/* ── Toast Notifications ───────────────────────────────────── */
#toast-container {
    position: fixed;
    top: 1.5rem; right: 1.5rem;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.toast {
    padding: 0.85rem 1.25rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    max-width: 320px;
    box-shadow: var(--shadow);
    animation: toastIn 0.3s ease forwards;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    border-left: 4px solid;
    backdrop-filter: blur(12px);
}

.toast-success { background: rgba(67,233,123,0.15); border-color: var(--success); color: var(--success); }
.toast-error   { background: rgba(255,101,132,0.15); border-color: var(--danger);  color: var(--danger);  }
.toast-info    { background: rgba(108,99,255,0.15);  border-color: var(--accent);  color: var(--accent);  }

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

/* ── Main Layout (quiz.php, dashboard) ─────────────────────── */
.app-wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.app-header {
    background: rgba(8,11,20,0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.app-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: 'Syne', sans-serif;
    font-size: 1.2rem;
    font-weight: 800;
}

.app-logo .icon {
    width: 38px; height: 38px;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
}

.header-user {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.user-avatar {
    width: 36px; height: 36px;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Syne', sans-serif;
    font-weight: 700;
    font-size: 0.9rem;
    color: #fff;
}

.app-main { flex: 1; padding: 2rem; max-width: 1100px; margin: 0 auto; width: 100%; }

/* ── Section Title ─────────────────────────────────────────── */
.section-title {
    margin-bottom: 1.5rem;
}

.section-title h2 { font-size: 1.6rem; }
.section-title p { color: var(--text-muted); font-size: 0.9rem; margin-top: 0.25rem; }

/* ── Subject Cards ─────────────────────────────────────────── */
.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.25rem;
    margin-bottom: 3rem;
}

.subject-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.75rem 1.25rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.subject-card::before {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 3px;
    background: var(--card-color, var(--accent));
    transform: scaleX(0);
    transition: var(--transition);
}

.subject-card:hover { background: var(--bg-card-hover); transform: translateY(-4px); box-shadow: var(--shadow), var(--glow); }
.subject-card:hover::before { transform: scaleX(1); }

.subject-card .card-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
    display: block;
}

.subject-card h3 { font-size: 1.1rem; margin-bottom: 0.25rem; }
.subject-card p  { color: var(--text-muted); font-size: 0.8rem; }

/* ── History Table ─────────────────────────────────────────── */
.table-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 2rem;
}

.table-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.table-header h3 { font-size: 1rem; }

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

th {
    background: rgba(255,255,255,0.04);
    padding: 0.75rem 1.25rem;
    text-align: left;
    font-family: 'Syne', sans-serif;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}

td {
    padding: 0.85rem 1.25rem;
    font-size: 0.9rem;
    border-bottom: 1px solid rgba(255,255,255,0.04);
    color: var(--text-primary);
}

tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: rgba(255,255,255,0.03); }

.badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-accent  { background: rgba(108,99,255,0.2);  color: var(--accent);  }
.badge-success { background: rgba(67,233,123,0.2);  color: var(--success); }
.badge-warning { background: rgba(255,209,102,0.2); color: var(--warning); }
.badge-danger  { background: rgba(255,101,132,0.2); color: var(--danger);  }

/* ── Quiz Page ─────────────────────────────────────────────── */
#quiz-container {
    display: none;
    max-width: 760px;
    margin: 0 auto;
}

.quiz-header-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.5rem;
}

.quiz-timer {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: 'Syne', sans-serif;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--accent);
}

.quiz-timer.warning { color: var(--warning); animation: pulse 1s infinite; }
.quiz-timer.danger  { color: var(--danger);  animation: pulse 0.5s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.5} }

.progress-bar-wrap {
    background: rgba(255,255,255,0.08);
    border-radius: 50px;
    height: 6px;
    margin-bottom: 1.5rem;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    border-radius: 50px;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    transition: width 0.4s ease;
}

.question-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    margin-bottom: 1.25rem;
    animation: slideUp 0.3s ease;
}

.question-number {
    font-size: 0.78rem;
    color: var(--accent);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 0.75rem;
}

.question-text {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.options-grid {
    display: grid;
    gap: 0.75rem;
}

.option-btn {
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.9rem 1.2rem;
    color: var(--text-primary);
    font-family: 'DM Sans', sans-serif;
    font-size: 0.95rem;
    text-align: left;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.option-btn:hover:not([disabled]) { background: rgba(108,99,255,0.12); border-color: var(--accent); }

.option-btn.selected   { background: rgba(108,99,255,0.15); border-color: var(--accent); }
.option-btn.correct    { background: rgba(67,233,123,0.15);  border-color: var(--success); color: var(--success); }
.option-btn.incorrect  { background: rgba(255,101,132,0.15); border-color: var(--danger);  color: var(--danger); }

.option-label {
    width: 28px; height: 28px;
    border: 1px solid var(--border);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.75rem;
    flex-shrink: 0;
}

.quiz-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

/* ── Result Page ───────────────────────────────────────────── */
.result-hero {
    text-align: center;
    padding: 2.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 2rem;
}

.score-circle {
    width: 140px; height: 140px;
    border-radius: 50%;
    background: conic-gradient(var(--accent) var(--pct, 0%), rgba(255,255,255,0.06) 0%);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    position: relative;
}

.score-circle::before {
    content: '';
    position: absolute;
    inset: 10px;
    background: var(--bg-base);
    border-radius: 50%;
}

.score-number {
    position: relative;
    z-index: 1;
    font-family: 'Syne', sans-serif;
    font-size: 2.2rem;
    font-weight: 800;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    text-align: center;
}

.stat-card .stat-value {
    font-family: 'Syne', sans-serif;
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 0.25rem;
}

.stat-card .stat-label { color: var(--text-muted); font-size: 0.8rem; }

.answers-list { display: flex; flex-direction: column; gap: 1rem; }

.answer-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
    border-left: 4px solid;
}

.answer-item.correct-item  { border-left-color: var(--success); }
.answer-item.incorrect-item { border-left-color: var(--danger); }

.answer-item .q-text  { font-weight: 500; margin-bottom: 0.75rem; }
.answer-item .a-label { font-size: 0.78rem; color: var(--text-muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 0.2rem; }
.answer-item .a-text  { margin-bottom: 0.5rem; }
.answer-item .explanation { font-size: 0.88rem; color: var(--text-muted); margin-top: 0.75rem; padding-top: 0.75rem; border-top: 1px solid var(--border); }

/* ── Admin Dashboard ───────────────────────────────────────── */
.admin-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    min-height: 100vh;
}

.sidebar {
    background: rgba(255,255,255,0.03);
    border-right: 1px solid var(--border);
    padding: 1.5rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-family: 'Syne', sans-serif;
    font-size: 1.05rem;
    font-weight: 800;
    padding: 0.75rem;
    margin-bottom: 1rem;
}

.sidebar-logo .icon {
    width: 34px; height: 34px;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

.sidebar-label {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 0.5rem 0.75rem;
    margin-top: 0.5rem;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.7rem 0.75rem;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    text-decoration: none;
}

.sidebar-link:hover, .sidebar-link.active {
    background: rgba(108,99,255,0.12);
    color: var(--accent);
}

.sidebar-link.active { font-weight: 600; }

.admin-content { padding: 2rem; overflow-y: auto; }

.admin-search {
    max-width: 320px;
    position: relative;
}

.admin-search input {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.6rem 1rem 0.6rem 2.5rem;
    color: var(--text-primary);
    font-family: 'DM Sans', sans-serif;
    font-size: 0.9rem;
    width: 100%;
    outline: none;
    transition: var(--transition);
}

.admin-search input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(108,99,255,0.2); }
.admin-search .search-icon { position: absolute; left: 0.75rem; top: 50%; transform: translateY(-50%); color: var(--text-muted); font-size: 0.85rem; }

/* Metric cards */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.metric-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    position: relative;
    overflow: hidden;
}

.metric-card::before {
    content: '';
    position: absolute;
    top: 0; right: 0;
    width: 60px; height: 60px;
    background: var(--metric-color, var(--accent));
    border-radius: 0 var(--radius) 0 60px;
    opacity: 0.1;
}

.metric-card .metric-icon { font-size: 1.5rem; margin-bottom: 0.5rem; }
.metric-card .metric-value { font-family: 'Syne', sans-serif; font-size: 2.2rem; font-weight: 800; }
.metric-card .metric-label { color: var(--text-muted); font-size: 0.8rem; margin-top: 0.1rem; }

/* ── Utilities ─────────────────────────────────────────────── */
.text-success { color: var(--success) !important; }
.text-danger  { color: var(--danger) !important; }
.text-accent  { color: var(--accent) !important; }
.text-muted   { color: var(--text-muted) !important; }
.text-center  { text-align: center; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }

.flex         { display: flex; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-center  { display: flex; align-items: center; justify-content: center; }
.gap-1        { gap: 0.5rem; }
.gap-2        { gap: 1rem; }

.loading-spinner {
    display: inline-block;
    width: 20px; height: 20px;
    border: 2px solid rgba(255,255,255,0.2);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

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

.hidden { display: none !important; }

.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-muted);
}

.empty-state .empty-icon { font-size: 3rem; margin-bottom: 1rem; }

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 768px) {
    .admin-layout { grid-template-columns: 1fr; }
    .sidebar { display: none; }
    .app-main { padding: 1rem; }
    .subjects-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .auth-card { padding: 1.75rem; }
    table { font-size: 0.82rem; }
    th, td { padding: 0.65rem 0.85rem; }
}

@media (max-width: 480px) {
    .subjects-grid { grid-template-columns: 1fr; }
}