/*
    Project: Nabin's Quiz Platform
    Author: Nabin Upreti
*/

/* ===== CSS VARIABLES ===== */
:root {
    --bg: #ffecfc;
    --bg2: #14142b;
    --bg3: #1e1e3a;
    --primary: #AA2C86;
    --primary-dark: #7a1f60;
    --primary-light: #d44fb0;
    --accent: #4f8ef7;
    --success: #00c853;
    --error: #ff1744;
    --text: #6d6d86;
    --text-muted: #565659;
    --border: rgba(170, 44, 134, 0.3);
    --card-bg: rgba(255,255,255,0.04);
    --card-hover: rgba(255,255,255,0.08);
    --shadow: 0 8px 32px rgba(0,0,0,0.4);
    --radius: 12px;
    --header-h: 64px;
    --transition: 0.25s ease;
}

[data-theme="light"] {
    --bg: #f0f0f8;
    --bg2: #ffffff;
    --bg3: #e8e8f4;
    --text: #1a1a2e;
    --text-muted: #555580;
    --border: rgba(170, 44, 134, 0.25);
    --card-bg: rgba(0,0,0,0.04);
    --card-hover: rgba(0,0,0,0.08);
    --shadow: 0 8px 32px rgba(0,0,0,0.12);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    transition: background var(--transition), color var(--transition);
}

/* ===== HEADER ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-h);
    background: #08dcff24;
    border-bottom: 1px solid rgba(15, 231, 221, 0.3);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.logo {
    font-size: 22px;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
    letter-spacing: -0.5px;
}

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

.nav-btn {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-muted);
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
}

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

.theme-toggle {
    border: 1px solid var(--border) !important;
}

/* ===== SCREENS ===== */
.screen {
    display: none;
    min-height: 100vh;
    padding: calc(var(--header-h) + 24px) 24px 80px;
}

.screen.active {
    display: block;
}

/* ===== DASHBOARD ===== */
.dashboard {
    max-width: 1100px;
    margin: 0 auto;
}

.dashboard-hero {
    text-align: center;
    padding: 40px 0 32px;
}

.dashboard-hero h1 {
    font-size: clamp(28px, 5vw, 52px);
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
}

.dashboard-hero p {
    color: var(--text-muted);
    font-size: 16px;
    max-width: 540px;
    margin: 0 auto;
    line-height: 1.6;
}

/* ===== STATS BAR ===== */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
    margin-bottom: 40px;
}

.stat-card {
    background: rgb(255 253 253 / 73%);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px 15px;
    display: block;
    align-items: center;
    gap: 14px;
    transition: background var(--transition);
}

.stat-card:hover {
    background: var(--card-hover);
}

.stat-icon {
    font-size: 28px;
}

.stat-card div {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 18px;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.stat-label {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
	text-align: justify;
}

/* ===== SECTION TITLE ===== */
.section-title {
    font-size: 20px;
    font-weight: 700;
    margin: 0 0 16px;
    color: var(--text);
}

/* ===== ACHIEVEMENTS ===== */
.achievements-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 40px;
}

.achievement-badge {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 8px 16px;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all var(--transition);
}

.achievement-badge.unlocked {
    background: rgba(170, 44, 134, 0.15);
    border-color: var(--primary);
    color: var(--primary-light);
}

.achievement-badge.locked {
    opacity: 0.4;
    filter: grayscale(1);
}

/* ===== DIFFICULTY ROW ===== */
.difficulty-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.difficulty-row label {
    font-size: 14px;
    color: var(--text-muted);
    font-weight: 500;
}

.difficulty-row select {
    background: var(--bg2);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 8px 14px;
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
    outline: none;
    transition: border-color var(--transition);
}

.difficulty-row select:focus {
    border-color: var(--primary);
}

/* ===== TOPICS GRID ===== */
.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 40px;
}

.topic-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
}

.topic-card:hover {
    background: var(--card-hover);
    border-color: var(--primary);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(170, 44, 134, 0.2);
}

.topic-icon {
    font-size: 36px;
}

.topic-name {
    font-size: 15px;
    font-weight: 700;
    color: var(--text);
}

.topic-desc {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.4;
}

.topic-stats {
    font-size: 11px;
    color: var(--primary);
    font-weight: 600;
}

/* ===== LEADERBOARD ===== */
.leaderboard {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 40px;
}

.leaderboard-row {
    display: flex;
    align-items: center;
    padding: 14px 20px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
    transition: background var(--transition);
}

.leaderboard-row:last-child {
    border-bottom: none;
}

.leaderboard-row:hover {
    background: var(--card-hover);
}

.lb-rank {
    font-size: 20px;
    width: 32px;
    text-align: center;
}

.lb-topic {
    flex: 1;
    font-weight: 600;
    font-size: 14px;
}

.lb-score {
    color: var(--primary);
    font-weight: 700;
    font-size: 16px;
}

.lb-date {
    font-size: 12px;
    color: var(--text-muted);
}

.leaderboard-empty {
    padding: 32px;
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
}

/* ===== QUIZ SCREEN ===== */
.quiz-container {
    max-width: 700px;
    margin: 0 auto;
}

.quiz-top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.quiz-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 15px;
    font-weight: 600;
}

.badge {
    background: var(--primary);
    color: #fff;
    font-size: 11px;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge.easy { background: var(--success); }
.badge.medium { background: var(--primary); }
.badge.hard { background: var(--error); }

.timer-wrap {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 16px;
    font-weight: 700;
}

#timerDisplay {
    font-size: 24px;
    font-weight: 800;
    color: var(--primary);
    min-width: 36px;
    text-align: center;
    transition: color var(--transition);
}

#timerDisplay.warning {
    color: #ff9800;
}

#timerDisplay.danger {
    color: var(--error);
    animation: pulse 0.5s infinite alternate;
}

@keyframes pulse {
    from { transform: scale(1); }
    to { transform: scale(1.1); }
}

/* ===== PROGRESS BAR ===== */
.progress-wrap {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 16px;
}

.progress-bar {
    flex: 1;
    height: 8px;
    background: var(--bg3);
    border-radius: 100px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 100px;
    transition: width 0.4s ease;
    width: 0%;
}

#progressLabel {
    font-size: 13px;
    color: var(--text-muted);
    white-space: nowrap;
    font-weight: 600;
}

/* ===== SCORE STREAK BAR ===== */
.score-streak-bar {
    display: flex;
    justify-content: space-between;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px 20px;
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.score-streak-bar strong {
    color: var(--text);
}

/* ===== QUESTION CARD ===== */
.question-card {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    margin-bottom: 20px;
}

.question-text {
    font-size: clamp(16px, 2.5vw, 22px);
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: 28px;
    color: var(--text);
}

.options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.option-btn {
    background: var(--card-bg);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    font-size: 14px;
    color: var(--text);
    cursor: pointer;
    text-align: left;
    transition: all var(--transition);
    font-weight: 500;
    line-height: 1.4;
    min-height: 60px;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.option-btn:hover:not(:disabled) {
    background: var(--card-hover);
    border-color: var(--primary);
    transform: translateY(-1px);
}

.option-btn.correct {
    background: rgba(0, 200, 83, 0.15);
    border-color: var(--success);
    color: var(--success);
}

.option-btn.incorrect {
    background: rgba(255, 23, 68, 0.1);
    border-color: var(--error);
    color: var(--error);
}

.option-btn:disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

/* ===== QUIZ CONTROLS ===== */
.quiz-controls {
    display: flex;
    justify-content: flex-end;
}

/* ===== BUTTONS ===== */
.btn-primary {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 12px 28px;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(170,44,134,0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
    padding: 12px 28px;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-secondary:hover {
    background: var(--primary);
    color: #fff;
}

.btn-ghost {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-ghost:hover {
    border-color: var(--error);
    color: var(--error);
}

.btn-danger {
    background: transparent;
    color: var(--error);
    border: 1px solid var(--error);
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-danger:hover {
    background: var(--error);
    color: #fff;
}

/* ===== RESULTS SCREEN ===== */
.results-container {
    max-width: 720px;
    margin: 0 auto;
}

.results-title {
    font-size: 36px;
    font-weight: 800;
    text-align: center;
    margin-bottom: 32px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.results-circle-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 32px;
}

.circular-progress {
    position: relative;
    width: 180px;
    height: 180px;
    border-radius: 50%;
    background: conic-gradient(var(--primary) 0deg, var(--bg3) 0deg);
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 16px;
}

.circular-progress::before {
    content: '';
    position: absolute;
    width: 148px;
    height: 148px;
    background: var(--bg2);
    border-radius: 50%;
}

.progress-value {
    position: relative;
    font-size: 36px;
    font-weight: 800;
    color: var(--text);
}

.score-text {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-muted);
}

.results-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
    margin-bottom: 32px;
}

.result-stat {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    text-align: center;
}

.result-stat span {
    font-size: 13px;
    color: var(--text-muted);
}

.result-stat strong {
    font-size: 20px;
    color: var(--primary);
}

.new-achievements {
    margin-bottom: 32px;
}

/* ===== BREAKDOWN ===== */
.breakdown-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 32px;
}

.breakdown-item {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px 20px;
}

.breakdown-item.correct {
    border-color: rgba(0, 200, 83, 0.4);
}

.breakdown-item.incorrect {
    border-color: rgba(255, 23, 68, 0.3);
}

.breakdown-q {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
    line-height: 1.4;
}

.breakdown-answers {
    display: flex;
    gap: 16px;
    font-size: 13px;
    flex-wrap: wrap;
}

.breakdown-correct {
    color: var(--success);
}

.breakdown-user {
    color: var(--error);
}

.results-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== HISTORY SCREEN ===== */
.history-container {
    max-width: 800px;
    margin: 0 auto;
}

.history-container h2 {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 24px;
}

.history-filters {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.history-filters select {
    background: var(--bg2);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 8px 14px;
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
    outline: none;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.history-item {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    transition: background var(--transition);
}

.history-item:hover {
    background: var(--card-hover);
}

.history-meta {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.history-topic {
    font-weight: 700;
    font-size: 16px;
}

.history-date {
    font-size: 12px;
    color: var(--text-muted);
}

.history-score-badge {
    background: var(--primary);
    color: #fff;
    font-size: 16px;
    font-weight: 800;
    padding: 8px 18px;
    border-radius: 24px;
    white-space: nowrap;
}

.history-score-badge.good {
    background: var(--success);
}

.history-score-badge.ok {
    background: #ff9800;
}

.history-score-badge.poor {
    background: var(--error);
}

.history-detail {
    font-size: 13px;
    color: var(--text-muted);
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.history-empty {
    text-align: center;
    color: var(--text-muted);
    padding: 60px 0;
    font-size: 16px;
}

/* ===== FOOTER ===== */
.footer {
    text-align: center;
    padding: 24px;
    color: var(--text-muted);
    font-size: 13px;
    background: var(--bg2);
    border-top: 1px solid var(--border);
    margin-top: 40px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 600px) {
    .header {
        padding: 0 16px;
    }

    .nav-btn {
        padding: 6px 10px;
        font-size: 12px;
    }

    .screen {
        padding-left: 16px;
        padding-right: 16px;
    }

    .options-grid {
        grid-template-columns: 1fr;
    }

    .quiz-top-bar {
        flex-wrap: wrap;
        gap: 8px;
    }

    .score-streak-bar {
        font-size: 12px;
        padding: 8px 12px;
    }

    .question-card {
        padding: 20px;
    }

    .results-buttons {
        flex-direction: column;
    }

    .results-buttons .btn-primary,
    .results-buttons .btn-secondary {
        width: 100%;
    }
}