:root {
    /* Color System (Dark Mode Premium Professional HSL) */
    --bg-main: hsl(215, 28%, 9%);
    --bg-card: hsla(217, 24%, 15%, 0.8);
    --bg-card-hover: hsla(217, 24%, 19%, 0.9);
    --bg-input: hsla(218, 28%, 11%, 0.95);
    
    --border-color: hsla(217, 16%, 24%, 0.7);
    --border-hover: hsla(211, 100%, 50%, 0.5);
    --border-focus: hsl(211, 100%, 50%);
    
    --text-primary: hsl(210, 40%, 98%);
    --text-secondary: hsl(215, 20%, 80%);
    --text-muted: hsl(215, 14%, 60%);
    
    --primary: hsl(211, 100%, 50%); /* Professional Royal Blue */
    --primary-glow: hsla(211, 100%, 50%, 0.15);
    --primary-hover: hsl(211, 100%, 56%);
    
    --success: hsl(142, 60%, 45%);
    --success-bg: hsla(142, 60%, 45%, 0.15);
    --success-border: hsla(142, 60%, 45%, 0.3);
    
    --error: hsl(354, 70%, 50%); /* Carmim Red for errors */
    --error-bg: hsla(354, 70%, 50%, 0.15);
    --error-border: hsla(354, 70%, 50%, 0.3);
    
    --gold: hsl(38, 92%, 50%);
    --gold-glow: hsla(38, 92%, 50%, 0.15);
    
    --font-sans: "Plus Jakarta Sans", system-ui, -apple-system, sans-serif;
    
    /* Layout Variables */
    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --transition-quick: all 0.15s ease;
    
    --max-width: 1280px;
}

/* Base Reset & Styling */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-main);
    background-image: 
        radial-gradient(at 0% 0%, hsla(211, 100%, 50%, 0.07) 0px, transparent 50%),
        radial-gradient(at 100% 100%, hsla(142, 71%, 45%, 0.04) 0px, transparent 50%);
    background-attachment: fixed;
    color: var(--text-primary);
    font-family: var(--font-sans);
    min-height: 100vh;
    line-height: 1.6;
    display: flex;
    justify-content: center;
    padding: 24px 16px;
    overflow-y: scroll;
}

/* App Container */
.app-container {
    width: 100%;
    max-width: var(--max-width);
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Header Section */
.main-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
    padding: 24px;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-glow);
    border: 1px solid var(--primary);
    color: var(--primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 15px var(--primary-glow);
}

.logo-area h1 {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--text-primary) 30%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* Dashboard & Progress Stats */
.dashboard-stats {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 24px;
}

.stat-card {
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-width: 160px;
    flex: 1;
}

.stat-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
}

.progress-bar-container {
    height: 8px;
    background: var(--bg-input);
    border-radius: 4px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary) 0%, var(--success) 100%);
    border-radius: 4px;
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 0 8px hsla(211, 100%, 50%, 0.4);
}

.stat-value {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-badge-group {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.stat-badge {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 80px;
    cursor: pointer;
    transition: var(--transition-quick);
}

.stat-badge:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    background: var(--bg-card-hover);
}

.badge-label {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
}

.badge-count {
    font-size: 1.1rem;
    font-weight: 800;
}

.text-gold {
    color: var(--gold);
    text-shadow: 0 0 10px var(--gold-glow);
}

/* Filters & Search Section */
.filters-panel {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 20px;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 4px 16px;
    transition: var(--transition-smooth);
}

.search-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.search-icon {
    color: var(--text-muted);
    margin-right: 12px;
    flex-shrink: 0;
}

.search-box input {
    width: 100%;
    height: 40px;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 500;
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.clear-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.4rem;
    cursor: pointer;
    padding: 0 6px;
}

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

.filters-group {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: space-between;
}

.filter-segment {
    display: flex;
    background: var(--bg-input);
    padding: 4px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    gap: 4px;
}

.filter-btn {
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-secondary);
    padding: 8px 16px;
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-quick);
    display: flex;
    align-items: center;
    gap: 6px;
}

.filter-btn:hover {
    color: var(--text-primary);
    background: hsla(223, 30%, 24%, 0.3);
}

.filter-btn.active {
    color: var(--text-primary);
    background: var(--primary);
    box-shadow: 0 4px 10px hsla(211, 100%, 50%, 0.25);
}

/* Main Layout Grid */
.main-content {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 24px;
}

/* Study Card Container & Card Styles */
.study-card-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 4px;
}

.card-category {
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 1.5px;
    color: var(--primary);
    background: var(--primary-glow);
    padding: 4px 10px;
    border-radius: 4px;
    border: 1px solid hsla(211, 100%, 50%, 0.2);
}

.card-source {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
}

.bookmark-action {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition-quick);
}

.bookmark-action:hover {
    border-color: var(--gold);
    color: var(--gold);
    background: var(--gold-glow);
    transform: scale(1.05);
}

.bookmark-action.bookmarked {
    border-color: var(--gold);
    color: var(--gold);
    background: var(--gold-glow);
    box-shadow: 0 0 10px var(--gold-glow);
}

/* Study Card Shell */
.study-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    min-height: 380px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 15px 35px hsla(0, 0%, 0%, 0.2);
}

.question-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.5;
}

/* Question Image Styling */
.question-image-box {
    display: flex;
    justify-content: center;
    align-items: center;
    background: hsl(223, 47%, 10%);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
    max-height: 240px;
    overflow: hidden;
}

.question-image-box img {
    max-width: 100%;
    max-height: 200px;
    object-fit: contain;
    border-radius: 4px;
    transition: transform 0.3s ease;
}

.question-image-box img:hover {
    transform: scale(1.03);
}

/* Options List Layout */
.options-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 8px;
}

.option-item {
    background: var(--bg-input);
    border: 1.5px solid var(--border-color);
    padding: 16px 20px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-secondary);
    display: flex;
    align-items: flex-start;
    gap: 12px;
    transition: var(--transition-quick);
    position: relative;
    overflow: hidden;
}

.option-item:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    color: var(--text-primary);
    transform: translateX(4px);
}

.option-indicator {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 2px solid var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 2px;
    font-size: 0.75rem;
    font-weight: 700;
    transition: var(--transition-quick);
}

.option-item:hover .option-indicator {
    border-color: var(--primary);
    color: var(--primary);
}

/* Selected state (Study interaction feedback - Blue) */
.option-item.selected {
    background: var(--primary-glow);
    border-color: var(--primary);
    color: var(--text-primary);
    box-shadow: 0 4px 12px var(--primary-glow);
}

.option-item.selected .option-indicator {
    border-color: var(--primary);
    background: var(--primary);
    color: var(--bg-main);
}

.option-text {
    flex-grow: 1;
}

/* Controls Section Styling */
.navigation-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 14px 20px;
}

.nav-btn {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition-quick);
}

.nav-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
    box-shadow: 0 4px 12px var(--primary-glow);
}

.nav-btn:active {
    transform: scale(0.97);
}

.pagination-info {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.separator {
    color: var(--text-muted);
}

#current-index {
    color: var(--primary);
}

/* Sidebar Styling */
.utility-sidebar {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.sidebar-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.sidebar-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    color: var(--primary);
}

.sidebar-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
}

.sidebar-hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 16px;
}

/* Notes Textarea styling */
#notes-textarea {
    width: 100%;
    height: 160px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 14px;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.88rem;
    outline: none;
    resize: none;
    transition: var(--transition-smooth);
}

#notes-textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

/* Keyboard Shortcuts layout */
.shortcut-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 14px;
}

.shortcut-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

kbd {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    padding: 2px 8px;
    border-radius: 4px;
    font-family: inherit;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--primary);
    box-shadow: 0 2px 0 var(--border-color);
}

/* Animations & Transition Utilities */
@keyframes slideInRight {
    from { transform: translateX(30px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes slideInLeft {
    from { transform: translateX(-30px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.slide-next {
    animation: slideInRight 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.slide-prev {
    animation: slideInLeft 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

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

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

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

/* ==========================================================================
   New Layout Components: Dashboard, Grid, Bubbles, Modal & Search
   ========================================================================== */

/* View Section Toggle */
.view-section {
    animation: fadeIn 0.3s ease-in-out forwards;
}

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

/* Dashboard Controls Row */
.dashboard-controls {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin-top: 8px;
}

/* Category Tabs */
.category-tabs {
    display: flex;
    background: var(--bg-input);
    padding: 4px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    gap: 4px;
}

.tab-btn {
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-secondary);
    padding: 10px 20px;
    font-size: 0.9rem;
    font-weight: 700;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition-quick);
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-sans);
}

.tab-btn:hover {
    color: var(--text-primary);
    background: hsla(223, 30%, 24%, 0.3);
}

.tab-btn.active {
    color: var(--text-primary);
    background: var(--primary);
    box-shadow: 0 4px 12px var(--primary-glow);
}

/* Grid & Section Title */
.grid-section {
    margin-top: 8px;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 800;
    margin-bottom: 16px;
    color: var(--text-primary);
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.tests-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
}

/* Test Card Premium Styling */
.test-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    cursor: pointer;
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    gap: 14px;
    position: relative;
    overflow: hidden;
}

.test-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: 0 8px 25px hsla(211, 100%, 50%, 0.15);
    background: var(--bg-card-hover);
}

.test-card.completed {
    border-color: var(--success-border);
}

.test-card.completed:hover {
    box-shadow: 0 8px 25px hsla(142, 71%, 45%, 0.1);
}

.test-card.in-progress {
    border-color: hsla(211, 100%, 50%, 0.3);
}

.test-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.test-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.test-card-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 600;
}

/* Test Card Progress Bar */
.test-card-progress {
    height: 6px;
    background: var(--bg-input);
    border-radius: 3px;
    overflow: hidden;
}

.test-card-progress-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 3px;
    transition: width 0.3s ease;
}

.test-card.completed .test-card-progress-fill {
    background: var(--success);
}

/* Status Badges */
.status-badge {
    font-size: 0.68rem;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-badge.todo {
    background: var(--bg-input);
    color: var(--text-muted);
    border: 1px solid var(--border-color);
}

.status-badge.progress {
    background: var(--primary-glow);
    color: var(--primary);
    border: 1px solid hsla(211, 100%, 50%, 0.3);
}

.status-badge.done {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid var(--success-border);
}

.no-tests-msg {
    grid-column: 1 / -1;
    text-align: center;
    color: var(--text-muted);
    padding: 40px;
    background: var(--bg-card);
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-md);
}

/* Test Navigation Header */
.test-navigation-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: 16px;
}

.back-btn {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition-quick);
    font-family: var(--font-sans);
}

.back-btn:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    color: var(--primary);
    transform: translateX(-2px);
}

.test-breadcrumb {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 8px;
}

.breadcrumb-separator {
    color: var(--border-color);
}

.test-breadcrumb .highlight {
    color: var(--text-primary);
    font-weight: 800;
}

.test-progress-indicator {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--success);
    background: var(--success-bg);
    padding: 4px 12px;
    border-radius: 20px;
    border: 1px solid var(--success-border);
}

/* Bubble Navigation Bar */
.bubbles-wrapper {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 4px;
}

.bubbles-container {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    max-width: 600px;
    width: 100%;
}

.bubble-btn {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    border: 1.5px solid var(--border-color);
    background: var(--bg-input);
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-weight: 700;
    font-size: 0.85rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-quick);
}

.bubble-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

.bubble-btn.active {
    border-color: var(--primary);
    background: var(--primary);
    color: var(--text-primary);
    box-shadow: 0 0 10px var(--primary-glow);
}

.bubble-btn.completed {
    border-color: var(--success);
    background: var(--success-bg);
    color: var(--success);
}

.bubble-btn.completed.active {
    background: var(--success);
    color: var(--bg-main);
    box-shadow: 0 0 10px var(--success-bg);
}

/* Sidebar Toggle State Button */
.study-actions-section {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.action-btn-secondary {
    width: 100%;
    background: var(--bg-input);
    border: 1.5px solid var(--border-color);
    color: var(--text-secondary);
    padding: 12px;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    font-family: var(--font-sans);
    transition: var(--transition-quick);
}

.action-btn-secondary:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
    background: var(--bg-card-hover);
}

.action-btn-secondary.active {
    background: var(--success-bg);
    border-color: var(--success);
    color: var(--success);
}

/* Premium Completion Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(4, 7, 16, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    animation: modalFadeIn 0.3s ease-out;
}

.modal-content {
    background: var(--bg-card);
    border: 2px solid var(--border-focus);
    border-radius: var(--radius-lg);
    max-width: 440px;
    width: 100%;
    padding: 40px 32px;
    text-align: center;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5), 0 0 30px var(--primary-glow);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 18px;
    animation: modalScaleUp 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes modalFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes modalScaleUp {
    from { transform: scale(0.9) translateY(20px); }
    to { transform: scale(1) translateY(0); }
}

.modal-icon {
    font-size: 3.5rem;
    margin-bottom: 8px;
    filter: drop-shadow(0 4px 8px var(--primary-glow));
}

.modal-content h2 {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--text-primary);
}

.modal-content p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.modal-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 100%;
    margin-top: 10px;
}

.modal-btn-primary {
    width: 100%;
    background: var(--primary);
    color: var(--text-primary);
    border: none;
    padding: 14px;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition-quick);
    font-family: var(--font-sans);
    box-shadow: 0 4px 15px var(--primary-glow);
}

.modal-btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px hsla(211, 100%, 50%, 0.3);
}

.modal-btn-secondary {
    width: 100%;
    background: var(--bg-input);
    border: 1.5px solid var(--border-color);
    color: var(--text-secondary);
    padding: 12px;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition-quick);
    font-family: var(--font-sans);
}

.modal-btn-secondary:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
    background: var(--bg-card-hover);
}

/* Global Search Results Styles */
.search-results-section {
    margin-top: 8px;
    animation: fadeIn 0.3s ease-out;
}

.search-results-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 16px;
}

.search-result-item {
    background: var(--bg-card);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 18px 24px;
    cursor: pointer;
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.search-result-item:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
    transform: translateX(4px);
}

.search-result-item.completed {
    border-left: 4px solid var(--success);
}

.search-result-meta {
    display: flex;
    align-items: center;
    gap: 12px;
}

.search-result-badge {
    font-size: 0.65rem;
    font-weight: 800;
    padding: 2px 8px;
    border-radius: 4px;
    text-transform: uppercase;
}

.search-result-badge.category-sinais {
    background: var(--primary-glow);
    color: var(--primary);
    border: 1px solid hsla(211, 100%, 50%, 0.2);
}

.search-result-badge.category-regras {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid var(--success-border);
}

.search-result-source {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
}

.search-result-text {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
}

.more-results-hint {
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
    padding: 12px;
}

.no-results-msg {
    text-align: center;
    color: var(--text-muted);
    padding: 40px;
    background: var(--bg-card);
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-md);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 960px) {
    .main-content {
        grid-template-columns: 1fr;
    }
    .utility-sidebar {
        flex-direction: column;
        /* On tablet, move sidebar below the card */
        order: 2;
    }
    .study-card-container {
        order: 1;
    }
}

@media (max-width: 768px) {
    body {
        padding: 12px 10px;
    }
    
    .main-header {
        padding: 16px;
        gap: 16px;
    }
    
    .dashboard-stats {
        width: 100%;
    }
    
    .stat-card {
        min-width: 130px;
    }
    
    .tests-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    }
    
    .dashboard-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .category-tabs {
        width: 100%;
        justify-content: stretch;
    }
    
    .tab-btn {
        flex: 1;
        justify-content: center;
        padding: 10px 8px;
        font-size: 0.82rem;
    }
    
    .filter-segment {
        width: 100%;
    }
    
    .filter-btn {
        flex: 1;
        justify-content: center;
    }
}

@media (max-width: 600px) {
    body {
        padding: 10px 8px;
    }
    
    .main-header {
        padding: 14px;
        flex-direction: column;
        align-items: flex-start;
    }
    
    .dashboard-stats {
        width: 100%;
        flex-direction: column;
        gap: 12px;
    }
    
    .stat-card {
        min-width: unset;
        width: 100%;
    }
    
    .stat-badge-group {
        width: 100%;
        justify-content: space-between;
    }
    
    .stat-badge {
        flex: 1;
        min-width: 70px;
    }
    
    .tests-grid {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }
    
    .bubble-btn {
        width: 30px;
        height: 30px;
        font-size: 0.78rem;
    }
    
    .study-card {
        padding: 18px;
        min-height: auto;
    }
    
    .question-text {
        font-size: 1.05rem;
    }
    
    .option-item {
        padding: 13px 14px;
        font-size: 0.9rem;
    }
    
    .navigation-controls {
        padding: 10px 14px;
    }
    
    .nav-btn {
        padding: 10px 14px;
        font-size: 0.82rem;
        gap: 6px;
    }
    
    .test-navigation-header {
        padding: 12px;
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .test-progress-indicator {
        align-self: flex-end;
    }
    
    .correction-stats-bar {
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    body {
        padding: 8px 6px;
    }
    
    .logo-area h1 {
        font-size: 1.2rem;
    }
    
    .subtitle {
        font-size: 0.78rem;
    }
    
    .tests-grid {
        grid-template-columns: 1fr;
    }
    
    .bubbles-container {
        gap: 4px;
        padding: 8px;
    }
    
    .bubble-btn {
        width: 28px;
        height: 28px;
        font-size: 0.72rem;
    }
    
    .study-card {
        padding: 14px;
    }
    
    .question-text {
        font-size: 1rem;
    }
    
    .option-item {
        padding: 11px 12px;
        font-size: 0.87rem;
    }
    
    .option-indicator {
        width: 18px;
        height: 18px;
        font-size: 0.68rem;
    }
    
    .nav-btn {
        padding: 9px 12px;
        font-size: 0.8rem;
    }
    
    .tab-btn {
        padding: 8px 6px;
        font-size: 0.78rem;
    }
    
    .section-title {
        font-size: 1.05rem;
    }
    
    .correction-q-card {
        padding: 16px;
    }
    
    .score-display {
        font-size: 2.2rem;
    }
    
    .modal-content {
        padding: 28px 20px;
    }
    
    .search-box input {
        font-size: 0.88rem;
    }
}


/* Error Flag Action Button in Sidebar */
.action-btn-error {
    width: 100%;
    background: var(--bg-input);
    border: 1.5px solid var(--border-color);
    color: var(--text-secondary);
    padding: 12px;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    font-family: var(--font-sans);
    transition: var(--transition-quick);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.action-btn-error:hover {
    border-color: var(--error);
    color: var(--text-primary);
    background: var(--bg-card-hover);
}

.action-btn-error.active {
    background: var(--error-bg);
    border-color: var(--error);
    color: var(--text-primary);
    box-shadow: 0 0 12px var(--error-bg);
    text-shadow: 0 0 5px var(--error-bg);
}

/* Category Tab Error counts and special colors */
.tab-btn.tab-btn-error {
    border-color: transparent;
}
.tab-btn.tab-btn-error:hover {
    color: var(--error);
    background: var(--error-bg);
}
.tab-btn.tab-btn-error.active {
    color: var(--text-primary);
    background: var(--error);
    box-shadow: 0 4px 12px var(--error-bg);
}

.error-badge-pill {
    font-size: 0.75rem;
    background: var(--error-bg);
    color: var(--error);
    padding: 2px 6px;
    border-radius: 10px;
    font-weight: 800;
    border: 1px solid var(--error-border);
}

.tab-btn.active .error-badge-pill {
    background: var(--bg-card);
    color: var(--text-primary);
    border-color: transparent;
}

/* Study Actions Section Wrapper */
.study-actions-section {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* ==========================================================================
   Correction View (Deferred Exam Feedback)
   ========================================================================== */
.correction-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 24px;
    margin-top: 16px;
}

.correction-questions-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.correction-q-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    position: relative;
    transition: var(--transition-smooth);
}

.correction-q-card.correct {
    border-left: 6px solid var(--success);
}

.correction-q-card.incorrect {
    border-left: 6px solid var(--error);
}

.correction-q-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
}

.correction-q-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Option States in Correction */
.option-item.correct-answer {
    background: var(--success-bg);
    border-color: var(--success);
    color: var(--text-primary);
}

.option-item.correct-answer .option-indicator {
    background: var(--success);
    border-color: var(--success);
    color: var(--bg-main);
}

.option-item.wrong-answer {
    background: var(--error-bg);
    border-color: var(--error);
    color: var(--text-primary);
}

.option-item.wrong-answer .option-indicator {
    background: var(--error);
    border-color: var(--error);
    color: var(--text-primary);
}

.option-badge {
    font-size: 0.7rem;
    font-weight: 800;
    padding: 2px 8px;
    border-radius: 4px;
    text-transform: uppercase;
    margin-left: auto;
}

.option-badge.user-selected-wrong {
    background: var(--error-bg);
    color: var(--error);
    border: 1px solid var(--error-border);
}

.option-badge.correct-indicator {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid var(--success-border);
}

.correction-sidebar {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.correction-stats-bar {
    display: flex;
    gap: 10px;
    align-items: center;
}

.stat-pill {
    font-size: 0.8rem;
    font-weight: 700;
    padding: 6px 14px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.stat-pill.correct {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid var(--success-border);
}

.stat-pill.incorrect {
    background: var(--error-bg);
    color: var(--error);
    border: 1px solid var(--error-border);
}

.stat-pill.pending {
    background: var(--primary-glow);
    color: var(--primary);
    border: 1px solid var(--border-hover);
}

.score-display {
    font-size: 3rem;
    font-weight: 800;
    text-align: center;
    margin: 10px 0;
    color: var(--text-primary);
}

.score-verdict {
    font-size: 1.1rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 15px;
}

.score-verdict.pass {
    color: var(--success);
}

.score-verdict.fail {
    color: var(--error);
}

@media (max-width: 960px) {
    .correction-layout {
        grid-template-columns: 1fr;
    }
    
    /* Move correction sidebar summary to the top on mobile */
    .correction-sidebar {
        order: -1;
    }
    
    .correction-questions-container {
        order: 1;
    }
}

@media (max-width: 600px) {
    .correction-layout {
        gap: 16px;
    }
    
    .correction-q-card {
        padding: 16px;
    }
    
    .correction-q-card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
}