/* ══ DARK TOKENS (default) ══ */
:root {
    --bg: #0d0d14;
    --surface: #13131f;
    --card: #1a1a2e;
    --border: #2a2a45;
    --accent: #f5a623;
    --accent3: #4ecdc4;
    --text: #e8e8f0;
    --muted: #7878a0;
    --correct: #22c55e;
    --wrong: #ef4444;
    --radius: 14px;
    --fhead: 'Poppins', sans-serif;
    --fbody: 'Inter', sans-serif;
    --fmono: 'JetBrains Mono', monospace;
    --nav-bg: rgba(13, 13, 20, 0.92);
    --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
    --opt-bg: rgba(255, 255, 255, 0.04);
    --pass-bg: rgba(255, 255, 255, 0.04);
    --grain-op: 0.05;
    --hgrad: linear-gradient(135deg, var(--accent) 0%, #fff 50%, var(--accent3) 100%);
}

/* ══ LIGHT TOKENS ══ */
body.light {
    --bg: #f5f0e8;
    --surface: #ece7dc;
    --card: #ffffff;
    --border: #d5cfc2;
    --text: #1c1c2e;
    --muted: #6b6070;
    --nav-bg: rgba(245, 240, 232, 0.95);
    --shadow: 0 16px 48px rgba(0, 0, 0, 0.10);
    --opt-bg: rgba(0, 0, 0, 0.03);
    --pass-bg: rgba(0, 0, 0, 0.04);
    --grain-op: 0.025;
    --hgrad: linear-gradient(135deg, #a05500 0%, #1c1c2e 50%, #2a8e87 100%);
}

body.light .pill.syn {
    background: rgba(34, 197, 94, .10);
    color: #166534;
    font-weight: 600;
}

body.light .pill.ant {
    background: rgba(239, 68, 68, .10);
    color: #991b1b;
    font-weight: 600;
}

body.light .usage-box {
    background: rgba(0, 0, 0, .03);
}

body.light .hindi-badge {
    background: rgba(0, 0, 0, .05);
    color: #1c1c2e;
    font-weight: 600;
}

body.light .option-btn {
    background: var(--opt-bg);
}

body.light .q-passage {
    background: var(--pass-bg);
}

body.light .word-card-header {
    background: linear-gradient(135deg, rgba(245, 166, 35, .07), rgba(78, 205, 196, .04));
}

body.light .class-card.selected {
    background: rgba(245, 166, 35, .08);
}

body.light .chip {
    background: rgba(0, 0, 0, .04);
}

/* ══ THEME TOGGLE ══ */
.theme-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 7px 14px;
    border-radius: 50px;
    background: var(--card);
    border: 1px solid var(--border);
    color: var(--muted);
    font-family: var(--fmono);
    font-size: .76rem;
    cursor: pointer;
    transition: all .3s;
    white-space: nowrap;
    flex-shrink: 0;
}

.theme-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.toggle-track {
    width: 36px;
    height: 20px;
    border-radius: 10px;
    background: var(--border);
    position: relative;
    transition: background .35s;
}

.toggle-thumb {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent);
    transition: transform .35s cubic-bezier(.4, 0, .2, 1);
    box-shadow: 0 1px 4px rgba(0, 0, 0, .3);
}

body.light .toggle-track {
    background: var(--accent);
}

body.light .toggle-thumb {
    transform: translateX(16px);
}

/* ══ PRELOADER ══ */
#preloader {
    position: fixed;
    inset: 0;
    z-index: 99999;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.35s, opacity 0.6s ease;
}

#lottie-container {
    width: 350px;
    height: 350px;
    max-width: 90vw;
}

/* ══ RESET ══ */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 18px;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--fbody);
    min-height: 100vh;
    overflow-x: hidden;
    transition: background .35s, color .35s;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    opacity: var(--grain-op);
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 512 512' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

::-webkit-scrollbar {
    width: 5px;
}

::-webkit-scrollbar-track {
    background: var(--bg);
}

::-webkit-scrollbar-thumb {
    background: var(--accent);
    border-radius: 3px;
}

/* ══ NAVBAR ══ */
#topnav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: .85rem 2rem;
    background: var(--nav-bg);
    backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--border);
    transition: background .35s, border-color .35s;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--fhead);
    font-size: 1.35rem;
    color: var(--accent);
    font-weight: 900;
    white-space: nowrap;
}

.nav-logo img {
    height: 36px;
    width: auto;
    border-radius: 8px;
}

.nav-center {
    display: flex;
    gap: 6px;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 16px;
    border-radius: 8px;
    background: transparent;
    color: var(--muted);
    border: 1px solid transparent;
    font-family: var(--fbody);
    font-size: .88rem;
    cursor: pointer;
    transition: all .2s;
}

.nav-btn:hover,
.nav-btn.active {
    background: var(--card);
    border-color: var(--accent);
    color: var(--accent);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
}

.hamburger span {
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all .3s;
}

/* ══ STREAK BADGE ══ */
.streak-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    background: linear-gradient(135deg, rgba(245, 166, 35, 0.15), rgba(239, 68, 68, 0.15));
    border: 1px solid rgba(245, 166, 35, 0.4);
    padding: 6px 14px;
    border-radius: 50px;
    font-family: var(--fmono);
    font-size: 0.9rem;
    color: var(--accent);
    font-weight: 700;
    text-shadow: 0 0 10px rgba(245, 166, 35, 0.4);
    box-shadow: 0 2px 10px rgba(245, 166, 35, 0.1);
    transition: transform 0.3s;
    cursor: default;
    white-space: nowrap;
}

.streak-badge:hover {
    transform: scale(1.05);
}

/* ══ HERO ══ */
#hero {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    text-align: center;
    padding: 2rem;
    overflow: hidden;
}

.hero-glow {
    position: absolute;
    width: 650px;
    height: 650px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(245, 166, 35, .13) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
}

.hero-rings {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
}

.hero-rings span {
    position: absolute;
    border-radius: 50%;
    border: 1px solid rgba(245, 166, 35, .1);
    animation: pulse-ring 4s ease-in-out infinite;
}

.hero-rings span:nth-child(1) {
    width: 300px;
    height: 300px;
}

.hero-rings span:nth-child(2) {
    width: 520px;
    height: 520px;
    animation-delay: .7s;
}

.hero-rings span:nth-child(3) {
    width: 740px;
    height: 740px;
    animation-delay: 1.4s;
}

@keyframes pulse-ring {

    0%,
    100% {
        opacity: .25;
        transform: scale(1);
    }

    50% {
        opacity: .7;
        transform: scale(1.05);
    }
}

.hero-badge {
    display: inline-block;
    background: rgba(245, 166, 35, .12);
    border: 1px solid rgba(245, 166, 35, .35);
    color: var(--accent);
    font-family: var(--fmono);
    font-size: .7rem;
    letter-spacing: 2px;
    padding: 6px 18px;
    border-radius: 40px;
    margin-bottom: 1.5rem;
}

.hero-title {
    font-family: var(--fhead);
    font-size: clamp(2.4rem, 8vw, 5.5rem);
    font-weight: 900;
    line-height: 1.1;
    background: var(--hgrad);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.hero-sub {
    font-size: 1.05rem;
    color: var(--muted);
    max-width: 460px;
    line-height: 1.75;
    margin: 0 auto 2.5rem auto;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 26px;
    border-radius: 50px;
    font-family: var(--fbody);
    font-size: .98rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all .3s ease;
    text-decoration: none;
}

.btn-primary {
    background: var(--accent);
    color: #0d0d14;
    box-shadow: 0 0 28px rgba(245, 166, 35, .35);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 46px rgba(245, 166, 35, .55);
}

.btn-outline {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-3px);
}

/* ══ SECTIONS ══ */
.section {
    display: none;
    padding: 5.5rem 1.5rem 3rem;
    max-width: 1200px;
    margin: 0 auto;
}

.section.active {
    display: block;
}

.section-title {
    font-family: var(--fhead);
    font-size: clamp(1.8rem, 5vw, 2.8rem);
    color: var(--accent);
    margin-bottom: .4rem;
}

.section-desc {
    color: var(--muted);
    margin-bottom: 2rem;
    font-size: .95rem;
}

/* ══ SIDEBAR LAYOUT ══ */
.sidebar-layout {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    min-height: 60vh;
}

.class-sidebar {
    width: 220px;
    flex-shrink: 0;
    background: transparent;
    border: none;
    position: sticky;
    top: 80px;
    max-height: calc(100vh - 100px);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 14px;
    font-family: var(--fmono);
    font-size: .75rem;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--accent);
    border-bottom: 1px solid var(--border);
    background: var(--card);
    border-radius: var(--radius) var(--radius) 0 0;
    flex-shrink: 0;
    text-align: center;
    border: 1px solid var(--border);
}

.dropdown-icon {
    display: none;
    transition: transform 0.3s ease;
}

.sidebar-list {
    overflow-y: auto;
    flex: 1;
    background: var(--card);
    padding: 8px;
    border: 1px solid var(--border);
    border-radius: 0 0 var(--radius) var(--radius);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.sidebar-list::-webkit-scrollbar {
    width: 4px;
}

.sidebar-list::-webkit-scrollbar-thumb {
    background: var(--accent);
    border-radius: 4px;
}

.sidebar-item {
    position: relative;
    display: flex;
    align-items: center;
    padding: 14px 18px;
    cursor: pointer;
    border: 1px solid transparent;
    border-radius: 12px;
    transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    color: var(--muted);
    font-family: var(--fbody);
    background: transparent;
    overflow: hidden;
}

.sidebar-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, rgba(245, 166, 35, 0.08) 0%, transparent 100%);
    transform: translateX(-100%);
    transition: transform 0.5s cubic-bezier(0.25, 0.8, 0.25, 1);
    z-index: 0;
}

.sidebar-item>* {
    position: relative;
    z-index: 1;
}

.sidebar-item:hover {
    color: var(--text);
    transform: translateX(4px);
    border-color: rgba(245, 166, 35, 0.2);
}

.sidebar-item:hover::before {
    transform: translateX(0);
}

.sidebar-item.active {
    background: rgba(245, 166, 35, 0.05);
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: 0 4px 12px rgba(245, 166, 35, 0.1);
}

.sidebar-item.active::before {
    transform: translateX(0);
    background: linear-gradient(90deg, rgba(245, 166, 35, 0.12) 0%, transparent 100%);
}

.sidebar-item-label {
    font-size: 1.05rem;
    font-weight: 600;
    transition: color 0.3s ease;
    width: 100%;
}

.sidebar-item.active .sidebar-item-label {
    font-weight: 700;
}

.sidebar-content {
    flex: 1;
    min-width: 0;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2.5rem;
    min-height: 420px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 5rem 2rem;
    text-align: center;
    color: var(--muted);
    gap: 1rem;
    height: 100%;
}

.empty-icon {
    font-size: 3.5rem;
    opacity: .35;
}

.empty-state p {
    font-size: .95rem;
    line-height: 1.8;
}

/* ══ CLASS GRID (legacy) ══ */
.class-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.class-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    cursor: pointer;
    transition: all .3s;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.class-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--accent), transparent 60%);
    opacity: 0;
    transition: opacity .3s;
}

.class-card:hover::before {
    opacity: .07;
}

.class-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: var(--shadow);
}

.class-card.selected {
    border-color: var(--accent);
    background: rgba(245, 166, 35, .07);
}

.class-card-num {
    font-family: var(--fmono);
    font-size: 2.2rem;
    color: var(--accent);
    display: block;
}

.class-card-label {
    font-size: .83rem;
    color: var(--muted);
    margin-top: 4px;
}

.chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-family: var(--fmono);
    font-size: .72rem;
    background: rgba(255, 255, 255, .05);
    border: 1px solid var(--border);
    color: var(--muted);
    padding: 3px 11px;
    border-radius: 20px;
}

/* ══ SEARCH BAR ══ */
.search-container {
    position: relative;
    width: 100%;
    margin-bottom: 1.5rem;
}

.search-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.25rem;
    color: var(--muted);
    pointer-events: none;
}

#globalSearch {
    width: 100%;
    padding: 14px 16px 14px 48px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--card);
    color: var(--text);
    font-family: var(--fbody);
    font-size: 1rem;
    transition: border-color .3s, box-shadow .3s;
}

#globalSearch:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(245, 166, 35, 0.12);
}

/* ══ ACTION ICONS (Audio & Bookmark) ══ */
.word-actions {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-top: 10px;
}

.action-icon {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--muted);
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    font-size: 1.1rem;
    outline: none;
}

body.light .action-icon {
    background: rgba(0, 0, 0, 0.04);
}

.action-icon:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-3px) scale(1.05);
}

.action-icon:active {
    transform: translateY(0) scale(0.95);
}

.action-icon.bookmarked {
    color: #ef4444; /* red heart */
    border-color: rgba(239, 68, 68, 0.3);
    background: rgba(239, 68, 68, 0.1);
}

.action-icon.bookmarked:hover {
    color: #dc2626;
    border-color: #ef4444;
}

/* ══ CHART CONTAINER ══ */
.chart-container {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    width: 100%;
    margin: 0 auto;
    box-shadow: var(--shadow);
}

/* ══ WORD CARDS ══ */
.word-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: transform .3s, box-shadow .3s;
    margin-bottom: 1.5rem;
}

.word-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.word-card-header {
    padding: 1.5rem;
    background: linear-gradient(135deg, rgba(245, 166, 35, .11), rgba(78, 205, 196, .05));
    border-bottom: 1px solid var(--border);
}

.word-main {
    font-family: var(--fhead);
    font-size: 1.85rem;
    color: var(--accent);
}

.word-pos {
    display: inline-block;
    font-family: var(--fmono);
    font-size: .68rem;
    color: var(--accent3);
    background: rgba(78, 205, 196, .1);
    border: 1px solid rgba(78, 205, 196, .28);
    padding: 2px 10px;
    border-radius: 20px;
    margin-left: 8px;
    vertical-align: middle;
}

.word-eng {
    color: var(--text);
    font-size: .95rem;
    line-height: 1.65;
    margin-top: 8px;
}

/* Hindi badge — only for meaning hint, not decorative label */
.hindi-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: .85rem;
    font-weight: 500;
    color: var(--text);
    background: rgba(255, 255, 255, .1);
    border: 1px solid rgba(255, 255, 255, .25);
    border-radius: 20px;
    padding: 4px 12px;
    margin-top: 8px;
    font-family: var(--fmono);
    cursor: help;
    transition: border-color .2s, color .2s, background .2s;
}

.hindi-badge:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(245, 166, 35, .1);
}

.word-card-body {
    padding: 1.2rem 1.5rem;
}

.pill-label {
    font-size: .7rem;
    color: var(--muted);
    font-family: var(--fmono);
    margin-bottom: 5px;
    text-transform: uppercase;
    letter-spacing: .5px;
}

.pill-group {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 6px;
    margin-bottom: 4px;
}

.pill {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: .82rem;
    background: rgba(255, 255, 255, .05);
    border: 1px solid var(--border);
    color: var(--text);
    transition: transform .15s;
}

.pill:hover {
    transform: translateY(-1px);
}

.pill.syn {
    border-color: rgba(34, 197, 94, .45);
    color: #4ade80;
    background: rgba(34, 197, 94, .12);
    font-weight: 500;
}

.pill.ant {
    border-color: rgba(239, 68, 68, .45);
    color: #f87171;
    background: rgba(239, 68, 68, .12);
    font-weight: 500;
}

.usage-box {
    background: rgba(255, 255, 255, .03);
    border-left: 3px solid var(--accent);
    border-radius: 0 8px 8px 0;
    padding: 10px 14px;
    margin-top: 10px;
    font-size: .87rem;
    color: var(--muted);
    font-style: italic;
    line-height: 1.6;
}

/* ══ QUIZ ══ */
.quiz-section-tabs {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.tab-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 15px;
    border-radius: 8px;
    background: var(--card);
    color: var(--muted);
    border: 1px solid var(--border);
    font-family: var(--fbody);
    font-size: .83rem;
    cursor: pointer;
    transition: all .2s;
}

.tab-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.tab-btn.active {
    background: var(--accent);
    color: #0d0d14;
    border-color: var(--accent);
    font-weight: 700;
}

.quiz-progress-wrap {
    margin-bottom: 2rem;
}

.quiz-progress-info {
    display: flex;
    justify-content: space-between;
    font-family: var(--fmono);
    font-size: .8rem;
    color: var(--muted);
    margin-bottom: 8px;
}

.progress-bar {
    height: 5px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent3));
    border-radius: 3px;
    transition: width .5s ease;
}

.quiz-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    margin-bottom: 1.5rem;
    position: relative;
    overflow: hidden;
}

.quiz-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent3));
}

.q-type-badge {
    display: inline-block;
    font-family: var(--fmono);
    font-size: .69rem;
    letter-spacing: 1px;
    color: var(--accent3);
    border: 1px solid rgba(78, 205, 196, .3);
    background: rgba(78, 205, 196, .08);
    padding: 3px 10px;
    border-radius: 20px;
    margin-bottom: 1rem;
}

.q-num {
    font-family: var(--fmono);
    font-size: .78rem;
    color: var(--muted);
    margin-bottom: 5px;
}

.q-text {
    font-size: 1.12rem;
    color: var(--text);
    line-height: 1.7;
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.q-passage {
    background: var(--pass-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.2rem;
    margin-bottom: 1.2rem;
    font-size: .91rem;
    line-height: 1.8;
    color: var(--muted);
}

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

@media(max-width:520px) {
    .options-grid {
        grid-template-columns: 1fr;
    }
}

.option-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 13px 15px;
    border-radius: 10px;
    background: var(--opt-bg);
    border: 1px solid var(--border);
    color: var(--text);
    font-family: var(--fbody);
    font-size: .93rem;
    cursor: pointer;
    transition: all .2s;
    text-align: left;
    width: 100%;
}

.option-btn:hover:not(:disabled) {
    border-color: var(--accent);
    background: rgba(245, 166, 35, .07);
    color: var(--accent);
}

.option-btn.correct {
    border-color: var(--correct);
    background: rgba(34, 197, 94, .12);
    color: #86efac;
}

.option-btn.wrong {
    border-color: var(--wrong);
    background: rgba(239, 68, 68, .12);
    color: #fca5a5;
}

.option-btn:disabled {
    cursor: not-allowed;
}

.option-label {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--border);
    font-family: var(--fmono);
    font-size: .73rem;
    flex-shrink: 0;
}

.feedback-box {
    padding: 12px 16px;
    border-radius: 10px;
    margin-top: 1rem;
    font-size: .91rem;
    display: none;
    line-height: 1.55;
}

.feedback-box.show {
    display: block;
}

.feedback-box.correct {
    background: rgba(34, 197, 94, .09);
    border: 1px solid rgba(34, 197, 94, .28);
    color: #86efac;
}

.feedback-box.wrong {
    background: rgba(239, 68, 68, .09);
    border: 1px solid rgba(239, 68, 68, .28);
    color: #fca5a5;
}

.quiz-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 2rem;
}

/* ══ RESULTS ══ */
#results-panel {
    display: none;
    padding: 2rem;
    max-width: 680px;
    margin: 2rem auto;
}

#results-panel.show {
    display: block;
}

.result-hero {
    text-align: center;
    padding: 3rem 2rem;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
}

.result-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 0%, rgba(245, 166, 35, .18), transparent 60%);
}

.score-ring {
    width: 148px;
    height: 148px;
    border-radius: 50%;
    background: conic-gradient(var(--accent) var(--pct, 0%), var(--border) 0%);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    position: relative;
}

.score-ring::before {
    content: '';
    position: absolute;
    width: 112px;
    height: 112px;
    border-radius: 50%;
    background: var(--card);
}

.score-num {
    position: relative;
    z-index: 1;
    font-family: var(--fhead);
    font-size: 2.1rem;
    color: var(--accent);
    font-weight: 900;
}

.result-grade {
    font-family: var(--fhead);
    font-size: 3rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--accent), var(--accent3));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.score-label {
    font-size: .96rem;
    color: var(--muted);
    margin-top: 6px;
}

.stats-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.2rem;
    text-align: center;
}

.stat-num {
    font-family: var(--fhead);
    font-size: 2rem;
    font-weight: 900;
}

.stat-num.c {
    color: var(--correct);
}

.stat-num.w {
    color: var(--wrong);
}

.stat-num.s {
    color: var(--accent);
}

.stat-desc {
    font-size: .8rem;
    color: var(--muted);
    margin-top: 4px;
}

/* ══ UTILS ══ */
.mt1 {
    margin-top: .5rem;
}

.mt2 {
    margin-top: 1rem;
}

.mt3 {
    margin-top: 1.5rem;
}

.text-center {
    text-align: center;
}

.text-accent {
    color: var(--accent);
}

.hidden {
    display: none !important;
}

/* ══ RESPONSIVE ══ */
@media(max-width:680px) {
    .hamburger {
        display: flex;
    }

    .nav-center {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--surface);
        border-bottom: 1px solid var(--border);
        padding: 1rem;
        z-index: 99;
    }

    .nav-center.open {
        display: flex;
    }

    .nav-logo {
        margin-right: auto;
    }

    .nav-right {
        order: 2;
    }

    .hamburger {
        order: 3;
    }

    .theme-toggle .toggle-track,
    .theme-toggle #themeLabel {
        display: none;
    }

    .theme-toggle {
        padding: 8px;
        width: 36px;
        height: 36px;
        border-radius: 50%;
        justify-content: center;
    }

    .stats-row {
        grid-template-columns: 1fr;
    }

    #topnav {
        padding: .75rem 1.2rem;
    }

    .sidebar-layout {
        flex-direction: column;
    }

    .class-sidebar {
        width: 100%;
        max-height: none;
        position: relative;
        margin-bottom: 1rem;
        z-index: 10;
    }

    .sidebar-header {
        cursor: pointer;
        display: flex;
        justify-content: space-between;
        align-items: center;
        border-radius: 12px;
        border: 1px solid var(--border);
        background: var(--card);
        padding: 15px 20px;
        box-shadow: 0 4px 12px rgba(0,0,0,0.04);
        font-weight: 600;
        font-size: 0.95rem;
        transition: all 0.3s ease;
    }
    
    .sidebar-header:active {
        transform: scale(0.98);
    }

    .class-sidebar.open .sidebar-header {
        border-color: var(--accent);
        box-shadow: 0 4px 20px rgba(245, 166, 35, 0.12);
        color: var(--accent);
    }

    .dropdown-icon {
        display: block;
        transition: transform 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
        font-size: 1.1rem;
    }

    .class-sidebar.open .dropdown-icon {
        transform: rotate(180deg);
    }

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

    .sidebar-list {
        display: none;
        flex-direction: column;
        flex-wrap: nowrap;
        overflow-y: auto;
        overflow-x: hidden;
        position: absolute;
        top: calc(100% + 8px);
        left: 0;
        right: 0;
        z-index: 50;
        padding: 10px;
        gap: 4px;
        background: var(--card);
        border: 1px solid var(--border);
        border-radius: 14px;
        box-shadow: 0 16px 40px rgba(0,0,0,0.25);
        max-height: 60vh;
    }

    .class-sidebar.open .sidebar-list {
        display: flex;
        animation: dropSlide 0.35s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
    }

    .sidebar-item {
        flex-direction: row;
        align-items: center;
        padding: 10px 14px;
        border-radius: 10px;
        min-width: auto;
        border: 1px solid transparent;
        margin: 0;
        transition: background 0.2s, color 0.2s, border-color 0.2s;
        transform: none !important;
    }

    .sidebar-item-label {
        font-size: 0.95rem;
    }

    .sidebar-item::before {
        display: none;
    }

    .sidebar-item.active {
        border-color: var(--accent);
        background: rgba(245, 166, 35, 0.1);
        color: var(--accent);
        box-shadow: none;
    }

    .sidebar-item:hover {
        transform: none !important;
        border-color: rgba(245, 166, 35, 0.4);
        background: rgba(245, 166, 35, 0.05);
    }

    .sidebar-content {
        border-radius: var(--radius);
        padding: 1.5rem;
        box-shadow: none;
    }
}

@media(max-width:440px) {
    .quiz-section-tabs {
        gap: 6px;
    }
}

/* ══ CUSTOM MODAL ══ */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(13, 13, 20, 0.8);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2.5rem;
    max-width: 480px;
    width: 90%;
    text-align: center;
    transform: scale(0.95) translateY(10px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.modal-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--wrong), #ff8888);
}

.modal-overlay.active .modal-content {
    transform: scale(1) translateY(0);
}

.modal-icon {
    font-size: 4rem;
    color: var(--wrong);
    margin-bottom: 1rem;
    opacity: 0.9;
    background: rgba(239, 68, 68, 0.1);
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.modal-title {
    font-family: var(--fhead);
    font-size: 1.5rem;
    color: var(--text);
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.modal-desc {
    color: var(--muted);
    font-size: 0.95rem;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.modal-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn-danger {
    background: var(--wrong);
    color: #fff;
    box-shadow: 0 0 20px rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
    background: #dc2626;
    transform: translateY(-3px);
    box-shadow: 0 0 30px rgba(239, 68, 68, 0.5);
}

@media (max-width: 480px) {
    .modal-content {
        padding: 1.5rem;
        width: 95%;
    }
    
    .modal-icon {
        width: 60px;
        height: 60px;
        font-size: 3rem;
        margin-bottom: 0.75rem;
    }
    
    .modal-title {
        font-size: 1.35rem;
    }
    
    .modal-desc {
        font-size: 0.88rem;
        margin-bottom: 1.5rem;
    }
    
    .modal-actions {
        flex-direction: column-reverse;
        gap: 0.75rem;
    }
    
    .modal-actions .btn {
        width: 100%;
        justify-content: center;
    }
}