/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

:root {
    /* Color Palette - Premium LIGHT Mode (Default Orange Theme) */
    --bg-main: #fcf9f5;
    --bg-card: rgba(255, 255, 255, 0.75);
    --bg-sidebar: rgba(24df, 245, 240, 0.85); /* Warm light sidebar */
    --bg-sidebar: #f5f0eb;
    --border-color: rgba(230, 92, 0, 0.08);
    --text-primary: #2d221a;
    --text-secondary: #6e5e53;
    
    /* Warm Orange accents optimized for light mode */
    --primary: #d9480f;      /* Deep Orange */
    --primary-light: #f76707;
    --secondary: #fd7e14;    /* Bright Orange */
    --accent: #e8590c;       /* Warm Amber */
    --star-active: #f59f00;  /* Gold */
    
    /* Shadows & Blur */
    --shadow-main: 0 8px 32px 0 rgba(217, 72, 15, 0.05);
    --glass-blur: blur(16px);
    
    /* Transition times */
    --transition-speed: 0.3s;
}

body.dark-theme {
    /* Color Palette - Premium DARK Mode (Warm Charcoal & Amber) */
    --bg-main: #0f0b08;      /* Very dark warm brown/black */
    --bg-card: rgba(30, 22, 16, 0.6);
    --bg-sidebar: rgba(20, 14, 10, 0.9);
    --border-color: rgba(255, 126, 41, 0.08);
    --text-primary: #f5eedc;
    --text-secondary: #a89a8c;
    
    /* Orange accents optimized for dark mode */
    --primary: #f76707;      /* Bright Orange */
    --primary-light: #ff924a;
    --secondary: #fd7e14;
    
    --shadow-main: 0 8px 32px 0 rgba(0, 0, 0, 0.45);
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    background-image: 
        radial-gradient(at 10% 10%, rgba(217, 72, 15, 0.03) 0px, transparent 50%),
        radial-gradient(at 90% 90%, rgba(253, 126, 20, 0.03) 0px, transparent 50%);
    background-attachment: fixed;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

body.dark-theme {
    background-image: 
        radial-gradient(at 10% 10%, rgba(247, 103, 7, 0.1) 0px, transparent 50%),
        radial-gradient(at 90% 90%, rgba(253, 126, 20, 0.1) 0px, transparent 50%);
}

/* App Container Layout */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar Styling */
.sidebar {
    width: 336px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    padding: 2.75rem 1.65rem;
    display: flex;
    flex-direction: column;
    gap: 2.8rem;
    backdrop-filter: var(--glass-blur);
    z-index: 10;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
    max-height: 100vh;
    overflow-y: auto;
}

#flashcard-controls-group, #exam-controls-group {
    display: flex;
    flex-direction: column;
    gap: 2.45rem;
}

#flashcard-controls-group:not([style*="display: none"]),
#exam-controls-group:not([style*="display: none"]) {
    display: flex !important;
    flex-direction: column !important;
    gap: 2.45rem !important;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--text-primary);
    background: linear-gradient(45deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

body.dark-theme .brand {
    background: linear-gradient(45deg, var(--primary-light), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand i {
    -webkit-text-fill-color: var(--primary);
}
body.dark-theme .brand i {
    -webkit-text-fill-color: var(--primary-light);
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.control-group h3 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    line-height: 1.35;
    margin: 0;
}

.control-group h3 i {
    font-size: 0.9rem;
    color: var(--primary);
}
body.dark-theme .control-group h3 i {
    color: var(--primary-light);
}

/* Selector Buttons */
.level-selector {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.4rem;
}

.btn-level {
    background: rgba(0, 0, 0, 0.015);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.6rem 0;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all var(--transition-speed);
}
body.dark-theme .btn-level {
    background: rgba(255, 255, 255, 0.02);
}

.btn-level:hover, .btn-level.active {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-color: transparent;
    color: #fff;
    box-shadow: 0 4px 12px rgba(217, 72, 15, 0.2);
    transform: translateY(-2px);
}
body.dark-theme .btn-level:hover, body.dark-theme .btn-level.active {
    box-shadow: 0 4px 12px rgba(247, 103, 7, 0.3);
}

.type-selector {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.65rem;
}

.btn-type {
    background: rgba(0, 0, 0, 0.015);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    min-height: 46px;
    padding: 0.85rem 0.65rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    transition: all var(--transition-speed);
}
body.dark-theme .btn-type {
    background: rgba(255, 255, 255, 0.02);
}

.btn-type:hover, .btn-type.active {
    background: linear-gradient(135deg, var(--secondary), var(--primary));
    border-color: transparent;
    color: #fff;
    box-shadow: 0 4px 12px rgba(253, 126, 20, 0.2);
    transform: translateY(-2px);
}

.filter-selector {
    display: flex;
    flex-direction: column;
    gap: 0.95rem;
}

.btn-filter {
    background: rgba(0, 0, 0, 0.015);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    min-height: 52px;
    padding: 1rem 1.05rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    text-align: left;
    transition: all var(--transition-speed);
    display: flex;
    align-items: center;
    gap: 0.6rem;
}
body.dark-theme .btn-filter {
    background: rgba(255, 255, 255, 0.02);
}

.btn-filter:hover, .btn-filter.active {
    background: rgba(217, 72, 15, 0.06);
    border-color: var(--primary);
    color: var(--text-primary);
}
body.dark-theme .btn-filter:hover, body.dark-theme .btn-filter.active {
    background: rgba(247, 103, 7, 0.15);
    border-color: var(--primary-light);
    color: #fff;
}

.btn-filter.active i {
    color: var(--star-active);
}

.order-selector {
    display: flex;
    flex-direction: column;
    gap: 0.95rem;
}

.btn-order {
    background: rgba(0, 0, 0, 0.015);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    min-height: 52px;
    padding: 1rem 1.05rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    text-align: left;
    transition: all var(--transition-speed);
    display: flex;
    align-items: center;
    gap: 0.6rem;
}
body.dark-theme .btn-order {
    background: rgba(255, 255, 255, 0.02);
}

.btn-order:hover, .btn-order.active {
    background: rgba(253, 126, 20, 0.06);
    border-color: var(--secondary);
    color: var(--text-primary);
}
body.dark-theme .btn-order:hover, body.dark-theme .btn-order.active {
    background: rgba(253, 126, 20, 0.15);
    color: #fff;
}

.sidebar-footer {
    margin-top: auto;
    display: flex;
    flex-direction: column;
    gap: 1.7rem;
    padding-top: 1.2rem;
}

.btn-secondary {
    background: rgba(0, 0, 0, 0.02);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.8rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all var(--transition-speed);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}
body.dark-theme .btn-secondary {
    background: rgba(255, 255, 255, 0.02);
    color: #fff;
}

.btn-secondary:hover {
    background: rgba(0, 0, 0, 0.05);
    border-color: rgba(0, 0, 0, 0.12);
    transform: translateY(-2px);
}
body.dark-theme .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.15);
}

/* Keyboard Shortcut Tip */
.shortcut-tip {
    background: rgba(0, 0, 0, 0.015);
    border: 1px solid var(--border-color);
    padding: 1rem;
    border-radius: 10px;
}
body.dark-theme .shortcut-tip {
    background: rgba(0, 0, 0, 0.2);
}

.shortcut-tip h4 {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.shortcut-tip ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.shortcut-tip li {
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

kbd {
    background-color: #f0f0f2;
    border: 1px solid #ccc;
    border-radius: 4px;
    color: #333;
    font-size: 0.7rem;
    padding: 0.15rem 0.4rem;
    box-shadow: 0 2px 0 #bbb;
    font-family: monospace;
}
body.dark-theme kbd {
    background-color: #2b2b36;
    border: 1px solid #444;
    color: #fff;
    box-shadow: 0 2px 0 #111;
}

/* Main Panel Styling */
.main-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 2.5rem 3rem;
    height: 100vh;
    overflow-y: auto;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.progress-info {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

#current-category {
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    color: var(--text-primary);
}

#card-counter {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.theme-actions {
    display: flex;
    gap: 0.6rem;
}

.btn-action {
    background: rgba(0, 0, 0, 0.02);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.6rem 1rem;
    border-radius: 30px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all var(--transition-speed);
}
body.dark-theme .btn-action {
    background: rgba(255, 255, 255, 0.03);
    color: #fff;
}

.btn-action:hover {
    background: rgba(0, 0, 0, 0.05);
    border-color: rgba(0, 0, 0, 0.12);
}
body.dark-theme .btn-action:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.15);
}

.btn-action i {
    color: var(--primary);
}
body.dark-theme .btn-action i {
    color: var(--primary-light);
}

/* Progress Bar */
.progress-bar-container {
    width: 100%;
    height: 6px;
    background: rgba(0, 0, 0, 0.03);
    border-radius: 3px;
    margin-bottom: 2rem;
    overflow: hidden;
}
body.dark-theme .progress-bar-container {
    background: rgba(255, 255, 255, 0.04);
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 3px;
    transition: width 0.3s ease;
    box-shadow: 0 0 8px rgba(217, 72, 15, 0.15);
}
body.dark-theme .progress-bar {
    box-shadow: 0 0 8px rgba(247, 103, 7, 0.4);
}

/* Flashcard Section */
.flashcard-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2rem;
}

#exam-area {
    justify-content: flex-start;
    align-items: stretch;
    gap: 1.8rem;
}

/* Card 3D Setup */
.card-container {
    width: 100%;
    max-width: 760px;
    height: min(620px, calc(100vh - 230px));
    min-height: 540px;
    perspective: 1000px;
}

.flashcard {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    cursor: pointer;
}

.flashcard.flipped {
    transform: rotateY(180deg);
}

/* Face Styles */
.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 22px;
    padding: 2.1rem 2.3rem 1.5rem 2.3rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-main);
    backdrop-filter: var(--glass-blur);
    transition: border-color 0.3s, background-color var(--transition-speed);
    overflow: hidden;
}

.card-face:hover {
    border-color: rgba(217, 72, 15, 0.15);
}
body.dark-theme .card-face:hover {
    border-color: rgba(255, 126, 41, 0.15);
}

.card-front {
    z-index: 2;
    transform: rotateY(0deg);
    background-image: 
        radial-gradient(circle at top right, rgba(217, 72, 15, 0.03) 0%, transparent 40%),
        radial-gradient(circle at bottom left, rgba(253, 126, 20, 0.03) 0%, transparent 40%);
}
body.dark-theme .card-front {
    background-image: 
        radial-gradient(circle at top right, rgba(247, 103, 7, 0.06) 0%, transparent 40%),
        radial-gradient(circle at bottom left, rgba(253, 126, 20, 0.06) 0%, transparent 40%);
}

.card-back {
    transform: rotateY(180deg);
    background-image: 
        radial-gradient(circle at top left, rgba(253, 126, 20, 0.03) 0%, transparent 40%),
        radial-gradient(circle at bottom right, rgba(217, 72, 15, 0.03) 0%, transparent 40%);
}
body.dark-theme .card-back {
    background-image: 
        radial-gradient(circle at top left, rgba(253, 126, 20, 0.06) 0%, transparent 40%),
        radial-gradient(circle at bottom right, rgba(247, 103, 7, 0.06) 0%, transparent 40%);
}

/* Actions Bar on Card */
.card-actions-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 40px;
}

.btn-card-action {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.015);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 1.05rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}
body.dark-theme .btn-card-action {
    background: rgba(255, 255, 255, 0.03);
}

.btn-card-action:hover {
    background: rgba(217, 72, 15, 0.06);
    color: var(--text-primary);
    transform: scale(1.1);
}
body.dark-theme .btn-card-action:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
}

.btn-card-action.active i {
    color: var(--star-active);
    font-weight: 900;
}

.card-badge {
    background: rgba(217, 72, 15, 0.06);
    border: 1px solid rgba(217, 72, 15, 0.15);
    color: var(--primary);
    padding: 0.3rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}
body.dark-theme .card-badge {
    background: rgba(247, 103, 7, 0.12);
    border: 1px solid rgba(247, 103, 7, 0.25);
    color: var(--primary-light);
}

.card-badge-back {
    background: rgba(253, 126, 20, 0.06);
    border: 1px solid rgba(253, 126, 20, 0.15);
    color: var(--secondary);
    padding: 0.3rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}
body.dark-theme .card-badge-back {
    background: rgba(253, 126, 20, 0.12);
    border: 1px solid rgba(253, 126, 20, 0.25);
}

/* Card Content Front */
.card-content-front {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    flex: 1;
    gap: 1rem;
}

.reading-container {
    height: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.2s;
}

.reading-container.hidden {
    opacity: 0;
    pointer-events: none;
}

#card-reading {
    font-size: 1.5rem;
    color: var(--text-secondary);
    font-weight: 500;
    letter-spacing: 0.5px;
}

#card-term {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: clamp(3.4rem, 6vw, 5rem);
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.5px;
    text-shadow: 0 1px 4px rgba(217, 72, 15, 0.05);
}
body.dark-theme #card-term {
    text-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
}

.card-hint {
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding-top: 0.5rem;
}

.card-hint i {
    animation: rotate 4s infinite linear;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(-360deg); }
}

/* Card Content Back */
.card-content-back {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    padding: 0.7rem 0.35rem;
    overflow-y: auto;
    min-height: 0;
}

.card-content-back::-webkit-scrollbar {
    width: 4px;
}
.card-content-back::-webkit-scrollbar-thumb {
    background: rgba(217, 72, 15, 0.2);
    border-radius: 4px;
}

.back-header {
    text-align: center;
    margin-bottom: 0.5rem;
}

#card-term-back {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 2.45rem;
    font-weight: 700;
    color: var(--text-primary);
    display: inline-block;
}

#card-reading-back {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-left: 0.5rem;
    font-weight: 500;
}

.divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
    width: 100%;
    margin-bottom: 0.8rem;
}

.back-body {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.detail-item {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.detail-item label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

#card-meaning {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
}

.meaning-section {
    border-left: 3px solid var(--primary-light);
    padding-left: 0.8rem;
}

.info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.9rem;
}

.badge-info {
    background: rgba(0, 0, 0, 0.015);
    border: 1px solid var(--border-color);
    padding: 0.4rem 0.8rem;
    border-radius: 8px;
    font-size: 0.85rem;
    color: var(--text-primary);
    font-weight: 500;
    display: inline-block;
    max-width: max-content;
}

.source-link {
    color: var(--primary);
    text-decoration: none;
}

.source-link:hover {
    border-color: var(--primary);
    background: rgba(217, 72, 15, 0.06);
}

.card-study-actions {
    display: flex;
    gap: 0.8rem;
    margin-top: 0.2rem;
}

.btn-card-study {
    flex: 1;
    min-height: 42px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    background: rgba(0, 0, 0, 0.02);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    font-size: 0.86rem;
    font-weight: 700;
    transition: all 0.2s;
}

.btn-card-study:hover {
    border-color: var(--primary);
    background: rgba(217, 72, 15, 0.06);
    transform: translateY(-1px);
}

.btn-card-study:first-child {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-color: transparent;
    color: #fff;
}

.btn-card-study:first-child:hover {
    box-shadow: 0 6px 18px rgba(217, 72, 15, 0.18);
}

body.dark-theme .btn-card-study {
    background: rgba(255, 255, 255, 0.03);
    color: #fff;
}

body.dark-theme .btn-card-study:first-child {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
}

body.dark-theme .source-link:hover {
    background: rgba(247, 103, 7, 0.12);
}

.ai-context-menu {
    position: fixed;
    z-index: 2000;
    min-width: 190px;
    flex-direction: column;
    gap: 0.25rem;
    padding: 0.45rem;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.96);
    box-shadow: 0 16px 40px rgba(45, 34, 26, 0.16);
    backdrop-filter: var(--glass-blur);
    animation: menuPop 0.12s ease-out;
}

body.dark-theme .ai-context-menu {
    background: rgba(24, 18, 14, 0.96);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.45);
}

.ai-context-menu button {
    width: 100%;
    min-height: 38px;
    border: 0;
    border-radius: 8px;
    background: transparent;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0 0.75rem;
    cursor: pointer;
    font-weight: 700;
    text-align: left;
}

.ai-context-menu button:hover {
    background: rgba(217, 72, 15, 0.08);
}

body.dark-theme .ai-context-menu button {
    color: #fff;
}

body.dark-theme .ai-context-menu button:hover {
    background: rgba(247, 103, 7, 0.16);
}

.ai-context-menu i {
    width: 16px;
    color: var(--primary);
}

@keyframes menuPop {
    from {
        opacity: 0;
        transform: translateY(-4px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

body.dark-theme .badge-info {
    background: rgba(255, 255, 255, 0.02);
}

/* Nav Control Buttons */
.navigation-controls {
    display: flex;
    align-items: center;
    gap: 1.2rem;
    width: 100%;
    max-width: 760px;
}

.btn-nav {
    flex: 1;
    background: rgba(0, 0, 0, 0.015);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 1rem 1.5rem;
    border-radius: 14px;
    cursor: pointer;
    font-weight: 700;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all var(--transition-speed);
}
body.dark-theme .btn-nav {
    background: rgba(255, 255, 255, 0.02);
    color: #fff;
}

.btn-nav:hover {
    background: rgba(0, 0, 0, 0.03);
    border-color: rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}
body.dark-theme .btn-nav:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.15);
}

.btn-flip-action {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-color: transparent;
    color: #fff;
    box-shadow: 0 4px 15px rgba(217, 72, 15, 0.1);
    flex: 1.4;
}
body.dark-theme .btn-flip-action {
    box-shadow: 0 4px 15px rgba(247, 103, 7, 0.35);
}

.btn-flip-action:hover {
    background: linear-gradient(135deg, var(--primary-light), var(--secondary));
    box-shadow: 0 6px 20px rgba(217, 72, 15, 0.2);
}
body.dark-theme .btn-flip-action:hover {
    box-shadow: 0 6px 20px rgba(247, 103, 7, 0.5);
}

/* Browse Modal overlay */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 100;
}
body.dark-theme .modal-overlay {
    background-color: rgba(0, 0, 0, 0.7);
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    width: 90%;
    max-width: 900px;
    height: 80vh;
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.08);
    transform: scale(0.9);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
body.dark-theme .modal-content {
    background: #140f0c;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.55);
}

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

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

.modal-header h2 {
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
}

.modal-header h2 i {
    color: var(--primary);
}
body.dark-theme .modal-header h2 i {
    color: var(--primary-light);
}

.btn-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 2rem;
    cursor: pointer;
    transition: color 0.2s;
    line-height: 1;
}

.btn-close:hover {
    color: var(--text-primary);
}

.modal-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    gap: 1rem;
}

.modal-search-bar {
    position: relative;
    width: 100%;
}

.modal-search-bar i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.modal-search-bar input {
    width: 100%;
    background: rgba(0, 0, 0, 0.015);
    border: 1px solid var(--border-color);
    padding: 0.8rem 1rem 0.8rem 2.8rem;
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 0.95rem;
    outline: none;
    transition: all 0.2s;
}
body.dark-theme .modal-search-bar input {
    background: rgba(255, 255, 255, 0.02);
}

.modal-search-bar input:focus {
    border-color: var(--primary);
    background: rgba(0, 0, 0, 0.03);
}
body.dark-theme .modal-search-bar input:focus {
    border-color: var(--primary-light);
    background: rgba(255, 255, 255, 0.06);
}

.table-container {
    flex: 1;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 10px;
}

.vocab-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.vocab-table th, .vocab-table td {
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-primary);
}

.vocab-table th {
    background: #faf7f2;
    font-weight: 600;
    color: var(--text-secondary);
    position: sticky;
    top: 0;
    z-index: 1;
    backdrop-filter: var(--glass-blur);
}
body.dark-theme .vocab-table th {
    background: rgba(255, 255, 255, 0.01);
}

.vocab-table tbody tr {
    cursor: pointer;
    transition: background 0.2s;
}

.vocab-table tbody tr:hover {
    background: rgba(217, 72, 15, 0.01);
}
body.dark-theme .vocab-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

.vocab-table tbody tr td:nth-child(2) {
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 700;
    color: var(--text-primary);
    font-size: 1.05rem;
}

.vocab-table tbody tr td:nth-child(3) {
    color: var(--text-secondary);
}

.btn-table-star {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1rem;
    transition: transform 0.1s;
}

.btn-table-star:hover {
    transform: scale(1.2);
}

.btn-table-star.active {
    color: var(--star-active);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.03);
}
body.dark-theme ::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.08);
}

::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 4px;
}
body.dark-theme ::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.08);
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.2);
}
body.dark-theme ::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.15);
}

/* ========================================== */
/* EXAM MODE STYLES                           */
/* ========================================== */

/* Phân nhóm đề thi Accordion */
.exam-level-group {
    margin-bottom: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    overflow: hidden;
    background: rgba(0, 0, 0, 0.01);
}
body.dark-theme .exam-level-group {
    background: rgba(255, 255, 255, 0.005);
}

.exam-level-header {
    background: rgba(0, 0, 0, 0.02);
    padding: 0.8rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 700;
    font-size: 0.9rem;
    color: var(--text-primary);
    transition: background 0.2s, color 0.2s;
    user-select: none;
}
body.dark-theme .exam-level-header {
    background: rgba(255, 255, 255, 0.02);
}

.exam-level-header:hover {
    background: rgba(217, 72, 15, 0.05);
    color: var(--primary);
}
body.dark-theme .exam-level-header:hover {
    background: rgba(247, 103, 7, 0.1);
    color: var(--primary-light);
}

.exam-level-group.active .exam-level-header {
    border-bottom: 1px solid var(--border-color);
    color: var(--primary);
}
body.dark-theme .exam-level-group.active .exam-level-header {
    color: var(--primary-light);
}

.exam-level-header .arrow-icon {
    font-size: 0.8rem;
    transition: transform 0.3s ease;
    color: var(--text-secondary);
}

.exam-level-group.active .exam-level-header .arrow-icon {
    transform: rotate(180deg);
    color: var(--primary);
}
body.dark-theme .exam-level-group.active .exam-level-header .arrow-icon {
    color: var(--primary-light);
}

.exam-sub-list {
    padding: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
    max-height: 280px;
    overflow-y: auto;
}

.exam-layout {
    display: flex;
    gap: 2.4rem;
    width: 100%;
    max-width: 1240px;
    margin: 0 auto;
    align-items: flex-start;
}

.exam-question-column {
    flex: 1 1 760px;
    display: flex;
    flex-direction: column;
    gap: 1.8rem;
    min-width: 0;
}

.exam-sidebar-column {
    flex: 0 0 310px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    border-radius: 18px;
    backdrop-filter: var(--glass-blur);
    box-shadow: var(--shadow-main);
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    position: sticky;
    top: 2rem;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.exam-sidebar-column h3 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.exam-sidebar-column h3 i {
    color: var(--primary);
}
body.dark-theme .exam-sidebar-column h3 i {
    color: var(--primary-light);
}

/* Question Grid */
.question-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.65rem;
    max-height: 250px;
    overflow-y: auto;
    padding-right: 0.2rem;
}

.grid-item {
    aspect-ratio: 1;
    background: rgba(0, 0, 0, 0.02);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}
body.dark-theme .grid-item {
    background: rgba(255, 255, 255, 0.02);
    color: var(--text-secondary);
}

.grid-item:hover {
    background: rgba(0, 0, 0, 0.06);
    color: var(--text-primary);
}
body.dark-theme .grid-item:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
}

.grid-item.active {
    border: 2px solid var(--primary);
    color: var(--primary);
    font-weight: 700;
}
body.dark-theme .grid-item.active {
    border-color: var(--primary-light);
    color: var(--primary-light);
}

.grid-item.answered-correct {
    background: #e6fcf5 !important;
    border-color: #2b8a3e !important;
    color: #2b8a3e !important;
}
body.dark-theme .grid-item.answered-correct {
    background: rgba(43, 138, 62, 0.2) !important;
    border-color: #40c057 !important;
    color: #8ce99a !important;
}

.grid-item.answered-incorrect {
    background: #fff5f5 !important;
    border-color: #c92a2a !important;
    color: #c92a2a !important;
}
body.dark-theme .grid-item.answered-incorrect {
    background: rgba(201, 42, 42, 0.2) !important;
    border-color: #fa5252 !important;
    color: #ffc9c9 !important;
}

/* Question Panel */
.question-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 2.6rem;
    border-radius: 18px;
    box-shadow: var(--shadow-main);
    backdrop-filter: var(--glass-blur);
    display: flex;
    flex-direction: column;
    gap: 1.9rem;
    min-height: 520px;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1.2rem;
}

.question-group {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 600;
    max-width: 80%;
    line-height: 1.65;
}

.question-number-badge {
    background: rgba(217, 72, 15, 0.08);
    border: 1px solid rgba(217, 72, 15, 0.2);
    color: var(--primary);
    padding: 0.3rem 0.8rem;
    border-radius: 12px;
    font-weight: 700;
    font-size: 0.8rem;
}
body.dark-theme .question-number-badge {
    background: rgba(247, 103, 7, 0.15);
    border-color: rgba(247, 103, 7, 0.3);
    color: var(--primary-light);
}

.question-text {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.65;
    margin: 0.2rem 0;
    overflow-wrap: anywhere;
    word-break: normal;
}

.question-text.text-long {
    font-size: 1.42rem;
    line-height: 1.7;
}

.question-text.text-very-long {
    font-size: 1.18rem;
    line-height: 1.75;
}

.question-text ruby {
    font-family: 'Noto Sans JP', sans-serif;
}

.question-text rt {
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--text-secondary);
}

.options-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.option-btn {
    width: 100%;
    text-align: left;
    background: rgba(0, 0, 0, 0.015);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    min-height: 70px;
    padding: 1.15rem 1.25rem;
    border-radius: 12px;
    font-size: 1.05rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    line-height: 1.6;
    transition: all 0.2s;
}

.option-btn.text-long {
    font-size: 0.94rem;
    line-height: 1.65;
}

.option-btn.text-very-long {
    font-size: 0.84rem;
    line-height: 1.7;
}
body.dark-theme .option-btn {
    background: rgba(255, 255, 255, 0.02);
}

.option-btn:hover {
    background: rgba(0, 0, 0, 0.03);
    border-color: rgba(217, 72, 15, 0.2);
    transform: translateX(4px);
}
body.dark-theme .option-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(247, 103, 7, 0.3);
}

.option-letter {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.04);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    flex-shrink: 0;
    margin-top: 0.05rem;
}
body.dark-theme .option-letter {
    background: rgba(255, 255, 255, 0.06);
}

.option-text {
    flex: 1;
    min-width: 0;
    overflow-wrap: anywhere;
    word-break: normal;
}

.option-text ruby {
    font-family: 'Noto Sans JP', sans-serif;
}

.option-text rt {
    font-size: 0.72em;
    color: var(--text-secondary);
}

.option-btn:hover .option-letter {
    background: var(--primary);
    color: #fff;
}
body.dark-theme .option-btn:hover .option-letter {
    background: var(--primary-light);
    color: #fff;
}

/* Correct Option */
.option-btn.correct {
    background: #ebfbee !important;
    border-color: #2b8a3e !important;
    color: #2b8a3e !important;
}
body.dark-theme .option-btn.correct {
    background: rgba(43, 138, 62, 0.12) !important;
    border-color: #40c057 !important;
    color: #8ce99a !important;
}

.option-btn.correct .option-letter {
    background: #2b8a3e !important;
    color: #fff !important;
}
body.dark-theme .option-btn.correct .option-letter {
    background: #40c057 !important;
    color: #000 !important;
}

/* Incorrect Option */
.option-btn.incorrect {
    background: #fff5f5 !important;
    border-color: #c92a2a !important;
    color: #c92a2a !important;
}
body.dark-theme .option-btn.incorrect {
    background: rgba(201, 42, 42, 0.12) !important;
    border-color: #fa5252 !important;
    color: #ffc9c9 !important;
}

.option-btn.incorrect .option-letter {
    background: #c92a2a !important;
    color: #fff !important;
}
body.dark-theme .option-btn.incorrect .option-letter {
    background: #fa5252 !important;
    color: #fff !important;
}

.option-btn.disabled {
    pointer-events: none;
    opacity: 0.7;
}

/* Explanation Box */
.explanation-box {
    margin-top: 1.5rem;
    padding: 1.2rem;
    border-radius: 12px;
    border-left: 4px solid var(--primary);
    background: rgba(217, 72, 15, 0.02);
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    animation: slideDown 0.3s ease-out;
}
body.dark-theme .explanation-box {
    background: rgba(247, 103, 7, 0.03);
    border-left-color: var(--primary-light);
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.explanation-status {
    font-weight: 700;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.explanation-status.correct-text {
    color: #2b8a3e;
}
.explanation-status.incorrect-text {
    color: #c92a2a;
}

.explanation-content {
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-primary);
}

.explanation-content b {
    color: var(--primary);
}
body.dark-theme .explanation-content b {
    color: var(--primary-light);
}

/* Summary Card */
.exam-summary-card {
    border: 1px solid var(--border-color);
    background: rgba(0,0,0,0.01);
    padding: 1.2rem;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}
body.dark-theme .exam-summary-card {
    background: rgba(255,255,255,0.01);
}

.exam-summary-card h4 {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.4rem;
}

.summary-stat-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    font-weight: 500;
}

.exam-navigation {
    display: flex;
    gap: 1rem;
    width: 100%;
    max-width: 1240px;
}

.exam-list-selector {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    max-height: 250px;
    overflow-y: auto;
    padding-right: 0.2rem;
}

.btn-exam-select {
    width: 100%;
    text-align: left;
    background: rgba(0,0,0,0.015);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.7rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: all var(--transition-speed);
}
body.dark-theme .btn-exam-select {
    background: rgba(255, 255, 255, 0.02);
}

.btn-exam-select:hover, .btn-exam-select.active {
    background: rgba(217, 72, 15, 0.06);
    border-color: var(--primary);
    color: var(--text-primary);
}
body.dark-theme .btn-exam-select:hover, body.dark-theme .btn-exam-select.active {
    background: rgba(247, 103, 7, 0.12);
    border-color: var(--primary-light);
    color: #fff;
}

/* Responsive CSS */
@media (max-width: 1024px) {
    .exam-layout {
        flex-direction: column;
    }
    
    .exam-sidebar-column {
        flex: none;
        position: static;
        width: 100%;
    }
    
    .app-container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        height: auto;
        padding: 1.5rem;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        gap: 1.2rem;
    }
    
    .main-panel {
        padding: 1.5rem;
        height: auto;
        overflow-y: visible;
    }
    
    .shortcut-tip {
        display: none;
    }
    
    .card-container {
        max-width: 700px;
        height: 540px;
        min-height: 540px;
    }
}

@media (max-width: 600px) {
    .sidebar {
        padding: 1rem;
    }
    
    .level-selector {
        grid-template-columns: repeat(5, 1fr);
    }
    
    .main-panel {
        padding: 1rem;
    }

    #exam-area {
        gap: 1rem;
    }

    .exam-layout {
        gap: 1rem;
    }

    .question-container {
        padding: 1.25rem;
        min-height: auto;
        gap: 1.15rem;
    }

    .question-header {
        flex-direction: column;
        gap: 0.7rem;
    }

    .question-group {
        max-width: 100%;
    }

    .question-text {
        font-size: 1.28rem;
        line-height: 1.62;
    }

    .question-text.text-long {
        font-size: 1.08rem;
    }

    .question-text.text-very-long {
        font-size: 0.95rem;
    }

    .option-btn {
        min-height: 62px;
        padding: 0.9rem 1rem;
        font-size: 0.98rem;
        gap: 0.75rem;
    }

    .option-btn.text-long {
        font-size: 0.86rem;
    }

    .option-btn.text-very-long {
        font-size: 0.78rem;
    }

    .exam-passage {
        padding: 1rem;
        font-size: 0.94rem;
        line-height: 1.75;
    }
    
    #card-term {
        font-size: 3.15rem;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
    
    .card-container {
        height: 540px;
        min-height: 540px;
    }

    .card-face {
        padding: 1.35rem 1.25rem 1rem;
        border-radius: 18px;
    }

    #card-reading {
        font-size: 1.15rem;
    }

    #card-term-back {
        font-size: 1.75rem;
    }

    #card-reading-back {
        display: block;
        margin-left: 0;
        margin-top: 0.2rem;
        font-size: 1rem;
    }

    #card-meaning {
        font-size: 1.15rem;
    }

    .card-study-actions {
        flex-direction: column;
        gap: 0.55rem;
    }
    
    .navigation-controls {
        flex-direction: column;
        gap: 0.6rem;
    }
    
    .btn-nav {
        width: 100%;
    }
}

/* Kiểu dáng cho Đoạn văn đọc hiểu & Hình ảnh */
.exam-passage {
    background: rgba(0, 0, 0, 0.015);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--secondary);
    padding: 1.6rem 1.75rem;
    border-radius: 12px;
    font-size: 1.05rem;
    line-height: 1.9;
    color: var(--text-primary);
    font-family: 'Noto Sans JP', 'Inter', sans-serif;
    margin-bottom: 0.2rem;
    max-height: 400px;
    overflow-y: auto;
    width: 100%;
    text-align: left;
}

.exam-passage.text-long {
    font-size: 0.96rem;
    line-height: 1.85;
}

.exam-passage.text-very-long {
    font-size: 0.88rem;
    line-height: 1.8;
    max-height: 470px;
}

body.dark-theme .exam-passage {
    background: rgba(255, 255, 255, 0.01);
}

.exam-passage img, .question-text img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 1rem 0;
    display: block;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

body.dark-theme .exam-passage img, body.dark-theme .question-text img {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
    filter: brightness(0.95);
}

/* Custom Audio Player */
.exam-audio-container {
    background: rgba(247, 103, 7, 0.05);
    border: 1px solid rgba(247, 103, 7, 0.2);
    border-radius: 12px;
    padding: 0.8rem 1.2rem;
    margin: 0.2rem 0;
    display: none; /* Shown dynamically */
}

body.dark-theme .exam-audio-container {
    background: rgba(247, 103, 7, 0.03);
    border-color: rgba(247, 103, 7, 0.15);
}

.custom-audio-player {
    display: flex;
    align-items: center;
    gap: 1rem;
    width: 100%;
}

.audio-btn {
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.2s, background 0.2s;
    box-shadow: 0 4px 6px rgba(247, 103, 7, 0.2);
}

.audio-btn:hover {
    background: var(--primary-light);
    transform: scale(1.05);
}

.audio-btn:active {
    transform: scale(0.95);
}

#audio-mute-btn {
    background: transparent;
    color: var(--text-secondary);
    box-shadow: none;
    width: 32px;
    height: 32px;
}

#audio-mute-btn:hover {
    color: var(--primary);
    background: rgba(247, 103, 7, 0.08);
}

.audio-timeline-container {
    flex: 1;
    cursor: pointer;
    padding: 0.5rem 0;
}

.audio-timeline {
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    position: relative;
    overflow: hidden;
}

.audio-progress {
    height: 100%;
    width: 0%;
    background: var(--primary);
    border-radius: 3px;
    transition: width 0.1s linear;
}

.audio-time {
    font-size: 0.85rem;
    font-family: monospace;
    color: var(--text-secondary);
    min-width: 90px;
    text-align: center;
    user-select: none;
}

/* Reading display for Exam Mode */
.exam-passage-hira {
    font-size: 0.9rem;
    color: var(--text-secondary);
    background: rgba(0, 0, 0, 0.015);
    border-radius: 10px;
    padding: 0.8rem 1rem;
    margin-bottom: 1.5rem;
    line-height: 1.5;
    user-select: text;
    border-left: 3px dashed var(--primary);
    max-height: 250px;
    overflow-y: auto;
}
body.dark-theme .exam-passage-hira {
    background: rgba(255, 255, 255, 0.01);
}

.exam-question-hira {
    font-size: 0.9rem;
    color: var(--text-secondary);
    background: rgba(0, 0, 0, 0.01);
    border-radius: 8px;
    padding: 0.5rem 0.8rem;
    margin-top: 0.5rem;
    margin-bottom: 1rem;
    line-height: 1.4;
    user-select: text;
    border-left: 3px solid var(--primary);
}
body.dark-theme .exam-question-hira {
    background: rgba(255, 255, 255, 0.005);
}

.option-wrapper {
    display: flex;
    flex-direction: column;
    width: 100%;
}

.option-hira-display {
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding: 0.2rem 1.2rem 0.5rem 2.8rem;
    font-family: 'Inter', sans-serif;
    user-select: text;
}

/* Floating Notes Widget */
.notes-widget {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.8rem;
}

.notes-toggle-btn {
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(247, 103, 7, 0.35);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    transition: transform 0.2s, background-color 0.2s;
}

.notes-toggle-btn:hover {
    background: var(--primary-light);
    transform: scale(1.08);
}

.notes-toggle-btn:active {
    transform: scale(0.95);
}

.notes-panel {
    width: 380px;
    height: 440px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: var(--shadow-main);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    backdrop-filter: var(--glass-blur);
    animation: slideInUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideInUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.notes-header {
    background: rgba(247, 103, 7, 0.08);
    border-bottom: 1px solid var(--border-color);
    padding: 0.8rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--primary);
}

body.dark-theme .notes-header {
    background: rgba(247, 103, 7, 0.15);
    color: var(--primary-light);
}

.notes-header-actions {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.btn-notes-study {
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    padding: 0.25rem 0.6rem;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.3rem;
    transition: background 0.2s;
}

.btn-notes-study:hover {
    background: var(--primary-light);
}

.notes-close-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.notes-close-btn:hover {
    color: var(--primary);
}

/* Notes Quick Form */
.notes-form-container {
    padding: 0.8rem 1rem;
    background: rgba(0, 0, 0, 0.02);
    border-bottom: 1px dashed var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
body.dark-theme .notes-form-container {
    background: rgba(255, 255, 255, 0.02);
}

.notes-form-title {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
}

.notes-form-row {
    display: flex;
    gap: 0.5rem;
}

.notes-input {
    flex: 1;
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.4rem 0.6rem;
    font-size: 0.82rem;
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.2s;
}

.notes-input:focus {
    border-color: var(--primary);
}

.flex-1 {
    flex: 1;
}

.btn-add-note {
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    transition: background 0.2s;
}

.btn-add-note:hover {
    background: var(--primary-light);
}

.notes-list-header {
    padding: 0.4rem 1rem;
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-secondary);
    background: rgba(0,0,0,0.01);
    border-bottom: 1px solid var(--border-color);
}

.notes-textarea {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    padding: 0.8rem 1rem;
    resize: none;
    color: var(--text-primary);
    font-family: monospace, inherit;
    font-size: 0.85rem;
    line-height: 1.6;
}