/* Main dark mode theme variables and base styles */
:root {
    --dark-bg: #121212;
    --darker-bg: #0d0d0d;
    --card-bg: #1e1e1e;
    --primary: #bb86fc;
    --primary-variant: #3700b3;
    --secondary: #03dac6;
    --text: #e0e0e0;
    --text-secondary: #a0a0a0;
    --success: #4caf50;
    --warning: #ff9800;
    --danger: #f44336;
    --progress: #03a9f4;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: var(--dark-bg);
    color: var(--text);
    min-height: 100vh;
    padding: 20px;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(30, 30, 46, 0.5) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(59, 30, 70, 0.5) 0%, transparent 20%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    text-align: center;
    padding: 30px 0;
    margin-bottom: 20px;
    position: relative;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 15px;
}

.logo i {
    font-size: 2.8rem;
    color: var(--primary);
    background: linear-gradient(135deg, var(--primary-variant), #6200ea);
    padding: 15px;
    border-radius: 50%;
}

h1 {
    font-size: 2.5rem;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 10px;
    text-shadow: 0 0 15px rgba(187, 134, 252, 0.2);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto 20px;
    line-height: 1.6;
}

.stats {
    display: flex;
    justify-content: center;
    gap: 25px;
    margin-top: 25px;
    flex-wrap: wrap;
}

.stat-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    min-width: 180px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.stat-card i {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: var(--primary);
}

.stat-card .number {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary);
    margin-bottom: 5px;
}

.stat-card .label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.app-container {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 25px;
    margin-top: 20px;
}

.sidebar {
    background: var(--darker-bg);
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.4);
    height: fit-content;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.section-title {
    color: var(--primary);
    margin-bottom: 20px;
    font-size: 1.3rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-title i {
    background: rgba(187, 134, 252, 0.1);
    padding: 8px;
    border-radius: 8px;
}

.sets-container {
    max-height: 500px;
    overflow-y: auto;
    padding-right: 10px;
}

.sets-container::-webkit-scrollbar {
    width: 8px;
}

.sets-container::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
}

.sets-container::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 10px;
}

.set-item {
    background: var(--card-bg);
    padding: 15px;
    margin-bottom: 15px;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.05);
    position: relative;
    overflow: hidden;
}

.set-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(187, 134, 252, 0.2);
    border-color: rgba(187, 134, 252, 0.3);
}

.set-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.set-name {
    font-weight: bold;
    font-size: 1.1rem;
    color: var(--text);
}

.set-status {
    font-size: 0.85rem;
    padding: 4px 10px;
    border-radius: 20px;
    font-weight: 500;
}

.status-not-started {
    background: rgba(160, 160, 160, 0.2);
    color: var(--text-secondary);
}

.status-in-progress {
    background: rgba(255, 152, 0, 0.2);
    color: var(--warning);
}

.status-completed {
    background: rgba(76, 175, 80, 0.2);
    color: var(--success);
}

.progress-container {
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    margin-top: 10px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--progress);
    border-radius: 10px;
    transition: width 0.5s ease;
}

.actions {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

.btn {
    padding: 10px 20px;
    border-radius: 8px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: var(--primary);
    color: #000;
    flex: 1;
}

.btn-primary:hover {
    background: #cda5ff;
    transform: translateY(-2px);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text);
    flex: 1;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
}

.test-options {
    margin-top: 25px;
    padding-top: 25px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.full-test-btn {
    background: var(--secondary);
    color: #000;
    width: 100%;
    padding: 14px;
    font-size: 1.1rem;
    font-weight: bold;
}

.full-test-btn:hover {
    background: #2ef1d9;
}

.main-content {
    background: var(--darker-bg);
    border-radius: 15px;
    padding: 30px;
    min-height: 600px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.content-title {
    font-size: 1.8rem;
    color: var(--primary);
}

.mode-toggle {
    display: flex;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: 5px;
}

.mode-btn {
    padding: 8px 20px;
    border-radius: 6px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-weight: 600;
}

.mode-btn.active {
    background: var(--primary);
    color: #000;
}

.word-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.word-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.05);
    cursor: pointer;
}

.word-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
    border-color: rgba(187, 134, 252, 0.3);
}

.word-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.word {
    font-size: 1.4rem;
    font-weight: bold;
    color: var(--primary);
}

.phonetic {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-style: italic;
}

.meaning {
    margin-bottom: 15px;
    line-height: 1.6;
}

.hindi {
    color: var(--secondary);
    font-weight: 500;
    margin-top: 8px;
}

.synonyms, .antonyms {
    margin-top: 12px;
    font-size: 0.9rem;
}

.synonyms span, .antonyms span {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 20px;
    margin-right: 8px;
    margin-top: 8px;
}

.synonyms span {
    background: rgba(3, 218, 198, 0.1);
    color: var(--secondary);
}

.antonyms span {
    background: rgba(244, 67, 54, 0.1);
    color: var(--danger);
}

.test-container {
    text-align: center;
    padding: 30px;
}

.question {
    font-size: 1.4rem;
    margin-bottom: 30px;
    line-height: 1.6;
}

.options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    max-width: 700px;
    margin: 0 auto;
}

.option {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 2px solid transparent;
}

.option:hover {
    border-color: var(--primary);
    transform: translateY(-3px);
}

.option.selected {
    border-color: var(--primary);
    background: rgba(187, 134, 252, 0.1);
}

.navigation {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 40px;
}

.nav-btn {
    padding: 12px 30px;
    font-size: 1.1rem;
}

.progress-info {
    margin-top: 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.result-container {
    text-align: center;
    padding: 40px;
}

.score {
    font-size: 3.5rem;
    font-weight: bold;
    color: var(--primary);
    margin: 20px 0;
}

.score-text {
    font-size: 1.3rem;
    margin-bottom: 30px;
}

.result-stats {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-top: 30px;
}

.stat-box {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    min-width: 150px;
}

.stat-box .number {
    font-size: 2rem;
    color: var(--primary);
    font-weight: bold;
    margin-bottom: 5px;
}

@media (max-width: 900px) {
    .app-container {
        grid-template-columns: 1fr;
    }
    
    .stats {
        flex-direction: column;
        align-items: center;
    }
    
    .options {
        grid-template-columns: 1fr;
    }
}