/* CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary-blue: #2196F3;
    --success-green: #4CAF50;
    --warning-yellow: #FFC107;
    --danger-red: #F44336;
    --secondary-purple: #9C27B0;
    
    /* Neutral Colors */
    --dark-bg: #121212;
    --dark-surface: #1e1e1e;
    --dark-text: #ffffff;
    --light-bg: #ffffff;
    --light-surface: #f8f9fa;
    --light-text: #212529;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary-blue), var(--secondary-purple));
    --gradient-success: linear-gradient(135deg, var(--success-green), var(--primary-blue));
    --gradient-warning: linear-gradient(135deg, var(--warning-yellow), var(--danger-red));
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 8px rgba(0,0,0,0.15);
    --shadow-lg: 0 8px 16px rgba(0,0,0,0.2);
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --bg-color: var(--dark-bg);
    --surface-color: var(--dark-surface);
    --text-color: var(--dark-text);
    --text-muted: #adb5bd;
    --border-color: #343a40;
}

/* Light Mode Variables (default) */
[data-theme="light"], :root {
    --bg-color: var(--light-bg);
    --surface-color: var(--light-surface);
    --text-color: var(--light-text);
    --text-muted: #6c757d;
    --border-color: #dee2e6;
}

/* Base Typography */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Header Styles */
.header {
    background: var(--gradient-primary);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1030;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.navbar-nav .nav-link {
    font-weight: 500;
    margin: 0 0.5rem;
    transition: color var(--transition-fast);
}

.navbar-nav .nav-link:hover {
    color: var(--warning-yellow) !important;
}

/* Hero Section */
.hero-section {
    background: var(--gradient-primary);
    color: white;
    padding: 4rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
    pointer-events: none;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
    position: relative;
    z-index: 1;
}

.highlight {
    background: linear-gradient(45deg, var(--warning-yellow), var(--danger-red));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 900;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    position: relative;
    z-index: 1;
}

/* Search Container */
.search-container {
    max-width: 600px;
    margin: 0 auto 2rem;
    position: relative;
    z-index: 1;
}

.search-input {
    height: 60px;
    border: none;
    border-radius: var(--radius-xl);
    padding: 0 60px 0 24px;
    font-size: 1.1rem;
    box-shadow: var(--shadow-lg);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.search-input:focus {
    outline: none;
    box-shadow: var(--shadow-lg), 0 0 0 4px rgba(255, 255, 255, 0.3);
    background: white;
}

.search-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 44px;
    height: 44px;
    border: none;
    border-radius: 50%;
    background: var(--gradient-success);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.search-btn:hover {
    transform: translateY(-50%) scale(1.1);
    box-shadow: var(--shadow-md);
}

/* Search Suggestions */
.search-suggestions {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    max-height: 300px;
    overflow-y: auto;
    z-index: 1000;
    display: none;
}

.search-suggestions.show {
    display: block;
    animation: slideDown var(--transition-fast);
}

.suggestion-item {
    padding: 12px 20px;
    cursor: pointer;
    border-bottom: 1px solid var(--border-color);
    transition: background-color var(--transition-fast);
    color: var(--text-color);
}

.suggestion-item:hover {
    background: var(--surface-color);
}

.suggestion-item:last-child {
    border-bottom: none;
}

/* Stats Cards */
.stat-card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: 1.5rem 1rem;
    text-align: center;
    backdrop-filter: blur(10px);
    transition: transform var(--transition-fast);
}

.stat-card:hover {
    transform: translateY(-4px);
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--warning-yellow);
    display: block;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
    margin-top: 0.5rem;
}

/* Section Styles */
.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 1rem;
    text-align: center;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    text-align: center;
    margin-bottom: 2rem;
}

/* Region Cards */
.region-card {
    background: var(--surface-color);
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    transition: all var(--transition-normal);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    height: 100%;
    position: relative;
    overflow: hidden;
}

.region-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    transition: left var(--transition-slow);
}

.region-card:hover::before {
    left: 100%;
}

.region-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-blue);
}

.region-card.norte {
    border-left: 4px solid var(--success-green);
}

.region-card.nordeste {
    border-left: 4px solid var(--warning-yellow);
}

.region-card.centro-oeste {
    border-left: 4px solid var(--danger-red);
}

.region-card.sudeste {
    border-left: 4px solid var(--primary-blue);
}

.region-card.sul {
    border-left: 4px solid var(--secondary-purple);
}

.region-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.region-card.norte .region-icon { color: var(--success-green); }
.region-card.nordeste .region-icon { color: var(--warning-yellow); }
.region-card.centro-oeste .region-icon { color: var(--danger-red); }
.region-card.sudeste .region-icon { color: var(--primary-blue); }
.region-card.sul .region-icon { color: var(--secondary-purple); }

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

.region-description {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.region-stats {
    display: flex;
    justify-content: space-around;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

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

.region-stat-number {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-blue);
}

.region-stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Slang Cards */
.slang-card {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    transition: all var(--transition-normal);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    height: 100%;
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.slang-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-blue);
}

.slang-term {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--primary-blue);
}

.slang-meaning {
    color: var(--text-muted);
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.slang-region {
    display: inline-block;
    background: var(--primary-blue);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

.slang-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: auto;
}

.btn-slang {
    flex: 1;
    padding: 0.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.btn-slang.primary {
    background: var(--primary-blue);
    color: white;
}

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

.btn-slang:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

/* Quiz Styles */
.quiz-section {
    background: var(--surface-color);
    padding: 4rem 0;
}

.quiz-card {
    background: var(--bg-color);
    border-radius: var(--radius-xl);
    padding: 3rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.quiz-options {
    display: grid;
    gap: 1rem;
    margin: 2rem 0;
}

.quiz-option {
    background: var(--surface-color);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
}

.quiz-option:hover {
    border-color: var(--primary-blue);
    background: rgba(33, 150, 243, 0.1);
}

.quiz-option.correct {
    border-color: var(--success-green);
    background: rgba(76, 175, 80, 0.1);
}

.quiz-option.incorrect {
    border-color: var(--danger-red);
    background: rgba(244, 67, 54, 0.1);
}

.quiz-result {
    padding: 2rem;
    border-radius: var(--radius-lg);
    text-align: center;
    margin: 2rem 0;
}

.quiz-result.correct {
    background: rgba(76, 175, 80, 0.1);
    border: 2px solid var(--success-green);
}

.quiz-result.incorrect {
    background: rgba(244, 67, 54, 0.1);
    border: 2px solid var(--danger-red);
}

/* Modal Styles */
.modal-content {
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    background: var(--bg-color);
    color: var(--text-color);
}

.modal-header {
    border-bottom: 1px solid var(--border-color);
    background: var(--surface-color);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.modal-footer {
    border-top: 1px solid var(--border-color);
    background: var(--surface-color);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.slang-detail {
    padding: 1rem 0;
}

.slang-detail h4 {
    color: var(--primary-blue);
    font-weight: 700;
    margin-bottom: 1rem;
}

.slang-example {
    background: var(--surface-color);
    border-left: 4px solid var(--primary-blue);
    padding: 1rem;
    border-radius: var(--radius-md);
    margin: 1rem 0;
    font-style: italic;
}

/* Offcanvas Styles */
.offcanvas {
    background: var(--bg-color);
    color: var(--text-color);
    border-left: 1px solid var(--border-color);
}

.offcanvas-header {
    border-bottom: 1px solid var(--border-color);
}

.daily-slang-card {
    background: var(--gradient-primary);
    color: white;
    border: none;
}

.daily-slang-card .card-header {
    background: rgba(255, 255, 255, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

/* FAQ Styles */
.faq-section {
    padding: 4rem 0;
    background: var(--surface-color);
}

.accordion-item {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    margin-bottom: 1rem;
    border-radius: var(--radius-lg) !important;
    overflow: hidden;
}

.accordion-button {
    background: var(--bg-color);
    color: var(--text-color);
    border: none;
    font-weight: 600;
}

.accordion-button:not(.collapsed) {
    background: var(--primary-blue);
    color: white;
}

.accordion-button:focus {
    box-shadow: none;
    border: none;
}

.accordion-body {
    background: var(--bg-color);
    color: var(--text-color);
}

/* Ad Section */
.ad-section {
    padding: 2rem 0;
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

/* Footer */
.footer {
    background: var(--dark-bg);
    color: var(--dark-text);
    padding: 3rem 0 2rem;
    margin-top: 4rem;
}

.footer h5 {
    color: var(--primary-blue);
    font-weight: 700;
    margin-bottom: 1rem;
}

.social-links a {
    font-size: 1.5rem;
    transition: color var(--transition-fast);
}

.social-links a:hover {
    color: var(--primary-blue) !important;
}

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

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

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

.fade-in {
    animation: fadeIn var(--transition-normal);
}

.slide-up {
    animation: slideUp var(--transition-normal);
}

/* Utility Classes */
.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bg-gradient-primary {
    background: var(--gradient-primary);
}

.bg-gradient-success {
    background: var(--gradient-success);
}

.bg-gradient-warning {
    background: var(--gradient-warning);
}

/* Loading States */
.placeholder-glow .placeholder {
    background: linear-gradient(90deg, var(--border-color), rgba(255,255,255,0.1), var(--border-color));
    background-size: 200% 100%;
    animation: placeholder-glow 2s ease-in-out infinite;
}

@keyframes placeholder-glow {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-section {
        padding: 2rem 0;
    }
    
    .search-input {
        height: 50px;
        font-size: 1rem;
        padding: 0 50px 0 20px;
    }
    
    .search-btn {
        width: 38px;
        height: 38px;
        right: 6px;
    }
    
    .stat-card {
        padding: 1rem 0.5rem;
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
    
    .quiz-card {
        padding: 2rem 1rem;
    }
    
    .region-card {
        padding: 1.5rem;
    }
    
    .slang-card {
        padding: 1rem;
    }
    
    .modal-dialog {
        margin: 1rem;
    }
}

@media (max-width: 576px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .region-icon {
        font-size: 2rem;
    }
    
    .region-title {
        font-size: 1.25rem;
    }
    
    .slang-term {
        font-size: 1.25rem;
    }
    
    .quiz-card {
        padding: 1.5rem 1rem;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --shadow-sm: 0 2px 4px rgba(0,0,0,0.3);
        --shadow-md: 0 4px 8px rgba(0,0,0,0.4);
        --shadow-lg: 0 8px 16px rgba(0,0,0,0.5);
    }
    
    .region-card,
    .slang-card {
        border-width: 2px;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .region-card::before {
        display: none;
    }
}

/* Print styles */
@media print {
    .header,
    .footer,
    .search-container,
    .ad-section,
    .quiz-section,
    .btn,
    .offcanvas {
        display: none !important;
    }
    
    .hero-section {
        background: none !important;
        color: black !important;
    }
    
    .region-card,
    .slang-card {
        border: 2px solid #000 !important;
        box-shadow: none !important;
        break-inside: avoid;
        margin-bottom: 1rem;
    }
}