:root {
    --bg: #f4f7fb;
    --card: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --line: #e5e7eb;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #16a34a;
    --warning: #f59e0b;
    --danger: #dc2626;
    --cemerlang: #16a34a;
    --lulus: #2563eb;
    --gagal: #dc2626;
    --radius: 14px;
    --shadow: 0 2px 10px rgba(15, 23, 42, .06);
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}
a { color: var(--primary); }
h1 { font-size: 1.6rem; margin: .2em 0 .4em; }
h2 { font-size: 1.3rem; margin: 1.4em 0 .6em; }
h3 { margin: .3em 0; }
.muted { color: var(--muted); }
.small { font-size: .875rem; }
.center { text-align: center; }
[hidden] { display: none !important; }

/* ---------- Layout ---------- */
.topbar {
    background: linear-gradient(90deg, #1e3a8a, #2563eb);
    color: #fff;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
}
.topbar .brand { color: #fff; font-weight: 700; font-size: 1.15rem; text-decoration: none; }
.topbar nav { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.topbar nav a:not(.btn) { color: #dbeafe; text-decoration: none; font-weight: 500; }
.topbar nav a:not(.btn):hover { color: #fff; }
.topbar .who { color: #bfdbfe; font-size: .9rem; }
.container { width: 100%; max-width: 1100px; margin: 0 auto; padding: 24px 16px; flex: 1; }
.footer { text-align: center; color: var(--muted); font-size: .8rem; padding: 18px; }

.card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    border: 1px solid var(--line);
}
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 18px; }

/* ---------- Butang & borang ---------- */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    padding: 10px 18px; border-radius: 10px; border: 1px solid transparent;
    font-weight: 600; font-size: .95rem; cursor: pointer; text-decoration: none;
    transition: background .15s, transform .05s;
    font-family: inherit;
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-block { width: 100%; }
.btn-sm { padding: 6px 12px; font-size: .85rem; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: #15803d; }
.btn-warning { background: var(--warning); color: #fff; }
.btn-light { background: #fff; color: var(--text); border-color: var(--line); }
.btn-light:hover { background: #f3f4f6; }

label { display: block; font-weight: 600; font-size: .9rem; margin-bottom: 14px; }
input[type=text], input[type=password], select {
    display: block; width: 100%; margin-top: 6px;
    padding: 10px 12px; border: 1px solid #d1d5db; border-radius: 10px;
    font-size: 1rem; font-family: inherit; background: #fff;
}
input:focus, select:focus { outline: 2px solid #93c5fd; border-color: var(--primary); }

.alert { padding: 12px 16px; border-radius: 10px; margin-bottom: 16px; font-size: .95rem; }
.alert-success { background: #dcfce7; color: #166534; }
.alert-danger  { background: #fee2e2; color: #991b1b; }
.alert-warning { background: #fef3c7; color: #92400e; }
.alert-info    { background: #dbeafe; color: #1e40af; }

/* ---------- Log masuk ---------- */
.auth-page {
    background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 60%, #93c5fd 100%);
    align-items: center; justify-content: center; padding: 20px;
}
.auth-card {
    background: #fff; border-radius: 20px; padding: 32px 28px;
    width: 100%; max-width: 400px; box-shadow: 0 20px 50px rgba(0, 0, 0, .2);
}
.auth-card h1 { text-align: center; font-size: 1.4rem; }
.auth-card > p.muted { text-align: center; }
.auth-logo { font-size: 3rem; text-align: center; }

/* ---------- Lencana ---------- */
.badge {
    display: inline-block; padding: 3px 10px; border-radius: 999px;
    font-size: .78rem; font-weight: 700; color: #fff; vertical-align: middle;
}
.badge-lg { font-size: 1rem; padding: 6px 18px; }
.badge-cemerlang { background: var(--cemerlang); }
.badge-lulus { background: var(--lulus); }
.badge-gagal { background: var(--gagal); }
.badge-progress { background: var(--warning); }
.grade-legend { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 18px; }

/* ---------- Dashboard ---------- */
.tabs { display: flex; gap: 8px; margin: 18px 0 14px; flex-wrap: wrap; }
.tab {
    padding: 10px 22px; border-radius: 999px; background: #fff; border: 1px solid var(--line);
    text-decoration: none; color: var(--text); font-weight: 600;
}
.tab.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.set-card { display: flex; flex-direction: column; }
.set-card form, .set-card > .btn { margin-top: auto; }
.set-group { margin-bottom: 26px; }
.set-group h2 { margin-bottom: .1em; }
.set-peperiksaan { border-top: 5px solid #dc2626; }
.set-peperiksaan .set-no { background: #fef2f2; color: #b91c1c; }
.set-latihan { border-top: 5px solid var(--primary); }
.type-tag { display: inline-block; padding: 1px 8px; border-radius: 6px; font-size: .75rem; font-weight: 700; }
.type-latihan { background: #eff6ff; color: var(--primary); }
.type-peperiksaan { background: #fef2f2; color: #b91c1c; }
.set-head { display: flex; justify-content: space-between; align-items: center; }
.set-no {
    background: #eff6ff; color: var(--primary); font-weight: 700;
    padding: 4px 12px; border-radius: 8px; font-size: .85rem;
}
.subject { color: var(--muted); font-size: .8rem; }
.meta { list-style: none; padding: 0; margin: 8px 0 12px; display: flex; gap: 12px; flex-wrap: wrap; font-size: .85rem; color: var(--muted); }

/* ---------- Peperiksaan ---------- */
.exam-bar {
    position: sticky; top: 0; z-index: 10;
    background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
    padding: 12px 18px; margin-bottom: 18px; box-shadow: var(--shadow);
    display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.exam-title { font-weight: 700; }
.timer {
    font-size: 1.5rem; font-weight: 800; font-variant-numeric: tabular-nums;
    padding: 6px 16px; border-radius: 12px; background: #eff6ff; color: var(--primary);
}
.timer.warn { background: #fef3c7; color: #b45309; }
.timer.danger { background: #fee2e2; color: var(--danger); animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .6; } }

.exam-layout { display: grid; grid-template-columns: 240px 1fr; gap: 18px; align-items: start; }
.navigator { position: sticky; top: 90px; }
.nav-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; margin: 10px 0; }
.nav-btn {
    aspect-ratio: 1; border: 1px solid #d1d5db; background: #fff; border-radius: 8px;
    font-weight: 700; cursor: pointer; font-family: inherit; font-size: .9rem;
}
.nav-btn.done { background: #dcfce7; border-color: #86efac; color: #166534; }
.nav-btn.current { outline: 3px solid var(--primary); outline-offset: 1px; }
.legend { display: flex; flex-direction: column; gap: 4px; margin-bottom: 12px; }
.dot { display: inline-block; width: 12px; height: 12px; border-radius: 3px; border: 1px solid #d1d5db; vertical-align: middle; }
.dot.done { background: #dcfce7; border-color: #86efac; }

.q-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-bottom: 12px; flex-wrap: wrap; }
.q-num { font-weight: 700; color: var(--primary); }
.q-topic { background: #f3f4f6; color: var(--muted); padding: 2px 10px; border-radius: 999px; font-size: .8rem; }
.q-text { font-size: 1.25rem; font-weight: 600; margin-bottom: 18px; line-height: 1.7; }
.options { display: grid; gap: 10px; }
.option {
    display: flex; align-items: center; gap: 14px; margin: 0;
    padding: 14px 16px; border: 2px solid var(--line); border-radius: 12px;
    cursor: pointer; font-weight: 500; font-size: 1.1rem; transition: border-color .15s, background .15s;
}
.option:hover { border-color: #93c5fd; background: #f8fbff; }
.option input { position: absolute; opacity: 0; pointer-events: none; }
.opt-letter {
    flex: 0 0 38px; height: 38px; border-radius: 50%; background: #f3f4f6;
    display: flex; align-items: center; justify-content: center; font-weight: 800;
}
.option:has(input:checked) { border-color: var(--primary); background: #eff6ff; }
.option:has(input:checked) .opt-letter { background: var(--primary); color: #fff; }
.option:has(input:focus-visible) { outline: 2px solid var(--primary); }
.q-actions { display: flex; justify-content: space-between; align-items: center; margin-top: 20px; gap: 10px; }

.modal { position: fixed; inset: 0; background: rgba(0, 0, 0, .5); display: flex; align-items: center; justify-content: center; z-index: 100; }
.modal-box { background: #fff; padding: 30px 40px; border-radius: 16px; text-align: center; }

/* ---------- Keputusan ---------- */
.result-card { text-align: center; border-top: 8px solid var(--primary); }
.result-cemerlang { border-top-color: var(--cemerlang); }
.result-lulus { border-top-color: var(--lulus); }
.result-gagal { border-top-color: var(--gagal); }
.result-icon { font-size: 3.5rem; }
.score-big { font-size: 3.2rem; font-weight: 800; line-height: 1.1; }
.score-ring { margin: 10px 0 20px; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-bottom: 16px; }
.stats div { background: #f9fafb; border-radius: 10px; padding: 12px; display: flex; flex-direction: column; }
.stats strong { font-size: 1.1rem; }
.stats span { font-size: .8rem; color: var(--muted); }
.actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

.review { display: grid; gap: 14px; }
.review-item { border-left: 6px solid var(--line); }
.review-right { border-left-color: var(--success); }
.review-wrong { border-left-color: var(--danger); }
.review-skip { border-left-color: var(--warning); }
.review-mark { font-weight: 700; font-size: .9rem; }
.review-right .review-mark { color: var(--success); }
.review-wrong .review-mark { color: var(--danger); }
.review-skip .review-mark { color: #b45309; }
.review .q-text { font-size: 1.05rem; }
.option.static { cursor: default; font-size: 1rem; padding: 10px 14px; }
.option.static:hover { background: none; border-color: var(--line); }
.option.correct, .option.correct:hover { border-color: var(--success); background: #f0fdf4; }
.option.correct .opt-letter { background: var(--success); color: #fff; }
.option.chosen-wrong, .option.chosen-wrong:hover { border-color: var(--danger); background: #fef2f2; }
.option.chosen-wrong .opt-letter { background: var(--danger); color: #fff; }
.tag { margin-left: auto; font-size: .75rem; background: #f3f4f6; padding: 2px 8px; border-radius: 6px; color: var(--muted); }

/* ---------- Jadual & statistik ---------- */
.stat-tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; margin-bottom: 18px; }
.tile { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 14px; box-shadow: var(--shadow); }
.tile strong { display: block; font-size: 1.6rem; }
.tile span { color: var(--muted); font-size: .85rem; }
.tile-cemerlang strong { color: var(--cemerlang); }
.tile-lulus strong { color: var(--lulus); }
.tile-gagal strong { color: var(--gagal); }

.table-wrap { overflow-x: auto; padding: 0; margin-top: 18px; }
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
th, td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--line); white-space: nowrap; }
th { background: #f9fafb; font-size: .8rem; text-transform: uppercase; color: var(--muted); letter-spacing: .03em; }
tbody tr:hover { background: #f9fafb; }

.filters { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-top: 18px; }
.filters input, .filters select { width: auto; margin: 0; flex: 1 1 160px; }

.set-perf { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; margin-top: 10px; }
.bar-row { display: grid; grid-template-columns: 48px 1fr 90px; align-items: center; gap: 8px; margin: 6px 0; font-size: .85rem; }
.perf-type { margin: 10px 0 2px; }
.bar { background: #f3f4f6; height: 12px; border-radius: 6px; overflow: hidden; }
.bar-fill { height: 100%; border-radius: 6px; }
.fill-cemerlang { background: var(--cemerlang); }
.fill-lulus { background: var(--lulus); }
.fill-gagal { background: var(--gagal); }

/* ---------- Animasi & keceriaan dashboard ---------- */
.brand-icon { display: inline-block; animation: zap 3s ease-in-out infinite; }
@keyframes zap {
    0%, 85%, 100% { transform: rotate(0) scale(1); }
    88% { transform: rotate(-15deg) scale(1.25); }
    92% { transform: rotate(12deg) scale(1.25); }
}

.hero {
    position: relative; overflow: hidden;
    display: flex; align-items: center; justify-content: space-between; gap: 16px;
    padding: 26px 28px; margin-bottom: 8px; border-radius: 20px; color: #fff;
    background: linear-gradient(120deg, #6366f1, #3b82f6, #06b6d4, #3b82f6, #6366f1);
    background-size: 300% 300%;
    animation: hero-bg 12s ease infinite, fade-down .6s ease both;
    box-shadow: 0 10px 30px rgba(59, 130, 246, .25);
}
@keyframes hero-bg { 0%, 100% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } }
.hero-text { position: relative; z-index: 1; }
.hero h1 { margin: 0 0 .3em; }
.hero p { margin: 0; color: #e0f2fe; }
.wave { display: inline-block; transform-origin: 70% 70%; animation: wave 2.4s ease-in-out infinite; }
@keyframes wave {
    0%, 60%, 100% { transform: rotate(0); }
    10%, 30% { transform: rotate(14deg); }
    20% { transform: rotate(-8deg); }
    40% { transform: rotate(-4deg); }
    50% { transform: rotate(10deg); }
}
.hero-mascot {
    position: relative; z-index: 1; font-size: 4rem; line-height: 1;
    animation: bounce 2.2s ease-in-out infinite;
    filter: drop-shadow(0 8px 6px rgba(0, 0, 0, .2));
}
@keyframes bounce {
    0%, 100% { transform: translateY(0) rotate(-3deg); }
    50% { transform: translateY(-12px) rotate(3deg); }
}
.hero-symbols { position: absolute; inset: 0; pointer-events: none; }
.hero-symbols span {
    position: absolute; bottom: -40px;
    left: calc(4% + var(--i) * 8%);
    font-size: var(--s, 1.4rem);
    font-weight: 800; color: rgba(255, 255, 255, .28);
    animation: float-up var(--d, 8s) linear infinite;
    animation-delay: calc(var(--i) * -1.3s);
}
@keyframes float-up {
    0% { transform: translateY(0) rotate(0); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateY(-220px) rotate(200deg); opacity: 0; }
}

.tab { transition: transform .2s, box-shadow .2s, background .2s; }
.tab:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(37, 99, 235, .2); }
.subject-tabs { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; margin: 18px 0 4px; }
.subject-tab {
    display: flex; align-items: center; justify-content: center; gap: 10px;
    padding: 14px 18px; border-radius: 16px; text-decoration: none;
    font-weight: 800; font-size: 1.1rem; color: var(--text);
    background: #fff; border: 2px solid var(--line);
    transition: transform .2s, box-shadow .2s, border-color .2s;
    animation: card-in .5s cubic-bezier(.2, .8, .3, 1.2) both;
}
.subject-tab:nth-child(2) { animation-delay: .08s; }
.subject-tab:nth-child(3) { animation-delay: .16s; }
.subject-tab:nth-child(4) { animation-delay: .24s; }
.subject-tab:hover { transform: translateY(-3px); box-shadow: 0 8px 18px rgba(15, 23, 42, .1); }
.subject-icon { font-size: 1.6rem; display: inline-block; }
.subject-tab.active .subject-icon { animation: bounce 2.2s ease-in-out infinite; }
.subject-matematik.active { background: linear-gradient(120deg, #2563eb, #7c3aed); color: #fff; border-color: transparent; box-shadow: 0 8px 20px rgba(37, 99, 235, .3); }
.subject-bm.active { background: linear-gradient(120deg, #059669, #0ea5e9); color: #fff; border-color: transparent; box-shadow: 0 8px 20px rgba(5, 150, 105, .3); }
.subject-bi.active { background: linear-gradient(120deg, #db2777, #f59e0b); color: #fff; border-color: transparent; box-shadow: 0 8px 20px rgba(219, 39, 119, .3); }
.subject-sains.active { background: linear-gradient(120deg, #65a30d, #0d9488); color: #fff; border-color: transparent; box-shadow: 0 8px 20px rgba(101, 163, 13, .3); }
.subject-tag { display: inline-block; padding: 1px 8px; border-radius: 6px; font-size: .75rem; font-weight: 700; background: #f3f4f6; color: var(--text); }
html { scroll-behavior: smooth; }
.set-group { scroll-margin-top: 16px; }
.tab-exam {
    margin-left: auto; color: #fff; border-color: transparent;
    background: linear-gradient(90deg, #dc2626, #f97316);
    box-shadow: 0 4px 14px rgba(220, 38, 38, .3);
}
.tab-exam:hover { box-shadow: 0 6px 18px rgba(220, 38, 38, .4); }
.tab-exam .arrow { display: inline-block; animation: nudge 1.4s ease-in-out infinite; }
@keyframes nudge { 50% { transform: translateY(4px); } }
.set-group:target > h2 { animation: highlight 1.6s ease .4s; border-radius: 10px; }
@keyframes highlight { 0%, 100% { background: transparent; } 30% { background: #fee2e2; } }
.tab.active { animation: pop .4s ease; box-shadow: 0 4px 14px rgba(37, 99, 235, .35); }
@keyframes pop { 0% { transform: scale(.9); } 60% { transform: scale(1.08); } 100% { transform: scale(1); } }

.grade-legend .badge { animation: pop .5s ease both; }
.grade-legend .badge:nth-child(2) { animation-delay: .1s; }
.grade-legend .badge:nth-child(3) { animation-delay: .2s; }

.set-group h2 { animation: fade-down .5s ease both; }
.set-card {
    animation: card-in .55s cubic-bezier(.2, .8, .3, 1.2) both;
    animation-delay: calc(.1s + var(--i, 0) * .08s);
    transition: transform .25s ease, box-shadow .25s ease;
}
.set-card:hover { transform: translateY(-6px) rotate(-.4deg); box-shadow: 0 14px 28px rgba(15, 23, 42, .12); }
.set-card:hover .set-no { animation: wiggle .5s ease; }
@keyframes card-in { from { opacity: 0; transform: translateY(24px) scale(.96); } to { opacity: 1; transform: none; } }
@keyframes fade-down { from { opacity: 0; transform: translateY(-12px); } to { opacity: 1; transform: none; } }
@keyframes wiggle { 0%, 100% { transform: rotate(0); } 25% { transform: rotate(-6deg); } 75% { transform: rotate(6deg); } }

.set-card .btn { position: relative; overflow: hidden; }
.set-card .btn::after {
    content: ""; position: absolute; top: 0; left: -75%; width: 50%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, .45), transparent);
    transform: skewX(-20deg);
}
.set-card:hover .btn::after { animation: shine .8s ease; }
@keyframes shine { to { left: 130%; } }
.btn-warning { animation: glow 1.6s ease-in-out infinite; }
@keyframes glow { 50% { box-shadow: 0 0 0 6px rgba(245, 158, 11, .25); } }

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

/* ---------- Responsif ---------- */
@media (max-width: 760px) {
    .exam-layout { grid-template-columns: 1fr; }
    .navigator { position: static; order: 2; }
    .stats { grid-template-columns: repeat(2, 1fr); }
    .q-text { font-size: 1.1rem; }
    .timer { font-size: 1.2rem; }
    .hero { padding: 20px; }
    .hero-mascot { font-size: 2.8rem; }
}

@media print {
    .topbar, .footer, .actions, .exam-bar { display: none; }
    body { background: #fff; }
    .card { box-shadow: none; break-inside: avoid; }
}