/* Import Design System */
@import url("design-system-AMqmWGk.css");

/* Custom Application Styles */

/* ========================================
   DROPDOWN FIXES
======================================== */

/* Ensure dropdown menu positioning works */
.navbar .dropdown-menu {
    position: absolute;
    z-index: 1050;
    min-width: 200px;
}

/* Fallback hover dropdown for unreliable JS */
@media (min-width: 992px) {
    .navbar .nav-item.dropdown:hover .dropdown-menu {
        display: block;
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
        transition: all 0.2s ease;
    }
    
    .navbar .dropdown-menu {
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: all 0.2s ease;
        display: block !important;
    }
    
    .navbar .dropdown-menu.show {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
}

/* Force dropdown to work on mobile */
@media (max-width: 991px) {
    .navbar .dropdown-menu {
        position: static !important;
        box-shadow: none;
        border: none;
        background: transparent;
        padding-left: 1rem;
    }
    
    .navbar .dropdown-item {
        color: rgba(255, 255, 255, 0.85);
        padding: 0.5rem 1rem;
    }
    
    .navbar .dropdown-item:hover {
        background-color: rgba(255, 255, 255, 0.1);
        color: #fff;
    }
}

/* ========================================
   AUDIO CONTROLS
======================================== */

.audio-controls {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.audio-btn {
    transition: all 0.2s ease;
    min-width: 120px;
}

.audio-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.audio-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.audio-btn .fa-spinner {
    animation: spin 1s linear infinite;
}

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

/* Responsive audio controls */
@media (max-width: 768px) {
    .audio-controls {
        gap: 0.25rem;
    }
    
    .audio-btn {
        min-width: 100px;
        font-size: 0.875rem;
        padding: 0.375rem 0.75rem;
    }
}

/* ========================================
   FLASHCARD SPECIFIC STYLES
======================================== */

/* Flashcard Container */
.flashcard-container {
    perspective: 1000px;
    margin: 0 auto;
    max-width: 500px;
}

/* Flashcard Flip Animation */
.flashcard {
    position: relative;
    width: 100%;
    height: 300px;
    transform-style: preserve-3d;
    transition: transform var(--duration-700) cubic-bezier(0.4, 0.0, 0.2, 1);
    cursor: pointer;
}

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

.flashcard-front,
.flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: var(--radius-xl);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: var(--space-6);
    box-shadow: var(--shadow-xl);
}

.flashcard-front {
    background: var(--gradient-primary);
    color: white;
}

.flashcard-back {
    background: rgba(255, 255, 255, 0.95);
    color: var(--gray-800);
    transform: rotateY(180deg);
    backdrop-filter: blur(10px);
}

.flashcard-word {
    font-size: var(--text-4xl);
    font-weight: var(--font-bold);
    margin-bottom: var(--space-4);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.flashcard-pronunciation {
    font-size: var(--text-lg);
    font-style: italic;
    opacity: 0.9;
    margin-bottom: var(--space-2);
}

.flashcard-translation {
    font-size: var(--text-2xl);
    font-weight: var(--font-semibold);
    margin-bottom: var(--space-4);
    color: var(--primary-blue);
}

.flashcard-example {
    font-size: var(--text-base);
    font-style: italic;
    opacity: 0.8;
    max-width: 80%;
    line-height: var(--leading-relaxed);
}

/* Learning Session Interface */
.learning-controls {
    margin-top: var(--space-8);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
}

.answer-buttons {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
    justify-content: center;
}

.progress-section {
    width: 100%;
    max-width: 500px;
    margin-bottom: var(--space-6);
}

.session-stats {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
    padding: var(--space-4);
    background: rgba(255, 255, 255, 0.9);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

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

.stat-number {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    color: var(--primary-blue);
    display: block;
}

.stat-label {
    font-size: var(--text-sm);
    color: var(--gray-600);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Mobile Touch Indicators */
.touch-hint {
    position: absolute;
    bottom: var(--space-4);
    left: 50%;
    transform: translateX(-50%);
    font-size: var(--text-sm);
    opacity: 0.7;
    color: white;
    background: rgba(0, 0, 0, 0.3);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-lg);
}

@media (max-width: 768px) {
    .touch-hint {
        display: block;
    }
}

@media (min-width: 769px) {
    .touch-hint {
        display: none;
    }
}

/* Keyboard Shortcuts Display */
.keyboard-shortcuts {
    position: fixed;
    bottom: var(--space-4);
    right: var(--space-4);
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: var(--space-3);
    border-radius: var(--radius-md);
    font-size: var(--text-xs);
    opacity: 0.7;
    transition: var(--transition-all);
}

.keyboard-shortcuts:hover {
    opacity: 1;
}

.shortcut-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--space-1);
    gap: var(--space-3);
}

.shortcut-key {
    background: rgba(255, 255, 255, 0.2);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    font-family: monospace;
    font-size: var(--text-xs);
}

/* ========================================
   DASHBOARD SPECIFIC STYLES
======================================== */

/* Hero Section */
.hero-section {
    text-align: center;
    padding: var(--space-16) 0 var(--space-12);
    background: var(--gradient-background);
}

.hero-title {
    font-size: var(--text-5xl);
    font-weight: var(--font-extrabold);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-6);
    line-height: var(--leading-tight);
}

.hero-subtitle {
    font-size: var(--text-xl);
    color: var(--gray-600);
    margin-bottom: var(--space-4);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: var(--leading-relaxed);
}

.hero-features {
    display: flex;
    justify-content: center;
    gap: var(--space-6);
    margin-top: var(--space-6);
    flex-wrap: wrap;
}

.hero-feature {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--gray-600);
    font-size: var(--text-sm);
}

.hero-feature i {
    color: var(--success-green);
}

/* Feature Cards Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-6);
    margin-top: var(--space-12);
}

.feature-card {
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition-all);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-4);
    background: var(--gradient-primary);
    color: white;
    font-size: var(--text-2xl);
}

/* Statistics Dashboard */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

.stat-card {
    background: var(--gradient-primary);
    color: white;
    border: none;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transform: translate(30px, -30px);
}

.stat-value {
    font-size: var(--text-4xl);
    font-weight: var(--font-extrabold);
    margin-bottom: var(--space-2);
}

.stat-title {
    font-size: var(--text-lg);
    font-weight: var(--font-medium);
    opacity: 0.9;
}

.stat-change {
    font-size: var(--text-sm);
    margin-top: var(--space-2);
    opacity: 0.8;
}

/* Progress Bars */
.progress-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
}

.progress-item {
    margin-bottom: var(--space-4);
}

.progress-item:last-child {
    margin-bottom: 0;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-2);
}

.progress-title {
    font-weight: var(--font-medium);
    color: var(--gray-700);
}

.progress-value {
    font-weight: var(--font-semibold);
    color: var(--primary-blue);
}

/* ========================================
   AUTHENTICATION FORMS
======================================== */

.auth-container {
    min-height: calc(100vh - 200px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-8) 0;
}

.auth-card {
    width: 100%;
    max-width: 400px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-xl);
}

.auth-header {
    text-align: center;
    margin-bottom: var(--space-6);
}

.auth-title {
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    color: var(--gray-900);
    margin-bottom: var(--space-2);
}

.auth-subtitle {
    color: var(--gray-600);
    font-size: var(--text-base);
}

.auth-form .form-group {
    margin-bottom: var(--space-4);
}

.auth-form .btn {
    width: 100%;
    margin-top: var(--space-4);
}

.auth-links {
    text-align: center;
    margin-top: var(--space-6);
    padding-top: var(--space-4);
    border-top: 1px solid var(--gray-200);
}

.auth-links a {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: var(--font-medium);
    transition: var(--transition-colors);
}

.auth-links a:hover {
    color: var(--primary-blue-dark);
    text-decoration: underline;
}

/* ========================================
   LOADING STATES
======================================== */

.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin var(--duration-1000) linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.loading-content {
    background: white;
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    text-align: center;
    box-shadow: var(--shadow-xl);
}

.loading-spinner-lg {
    width: 40px;
    height: 40px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary-blue);
    margin-bottom: var(--space-4);
}

/* ========================================
   RESPONSIVE DESIGN
======================================== */

@media (max-width: 768px) {
    .hero-title {
        font-size: var(--text-4xl);
    }
    
    .hero-subtitle {
        font-size: var(--text-lg);
    }
    
    .hero-features {
        flex-direction: column;
        align-items: center;
        gap: var(--space-3);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
        margin-top: var(--space-8);
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }
    
    .flashcard-word {
        font-size: var(--text-3xl);
    }
    
    .flashcard-translation {
        font-size: var(--text-xl);
    }
    
    .answer-buttons {
        flex-direction: column;
        width: 100%;
        max-width: 300px;
    }
    
    .keyboard-shortcuts {
        display: none;
    }
    
    .auth-container {
        padding: var(--space-4);
    }
    
    .session-stats {
        flex-direction: column;
        gap: var(--space-3);
    }
}

/* ========================================
   ACCESSIBILITY
======================================== */

/* Focus indicators */
*:focus {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .card {
        border: 2px solid var(--gray-800);
    }
    
    .btn {
        border: 2px solid transparent;
    }
    
    .btn-primary {
        border-color: var(--primary-blue-dark);
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .flashcard {
        transition: none;
    }
    
    .card:hover,
    .btn:hover,
    .hover-lift:hover,
    .hover-scale:hover {
        transform: none;
    }
}