/* Flashcards Page Styles */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f5f5f0;
    color: #2c3e50;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navigation - Same as other pages */
.main-nav {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
    letter-spacing: 1px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    padding: 0.5rem 0;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: #3498db;
    border-bottom: 2px solid #3498db;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 5px;
    gap: 4px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: white;
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* Main Content */
.flashcards-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 3rem 20px;
    flex: 1;
}

.flashcards-header {
    text-align: center;
    margin-bottom: 2rem;
}

.flashcards-header h1 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.flashcards-subtitle {
    font-size: 1.1rem;
    color: #7f8c8d;
}

/* Controls */
.flashcards-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.control-btn {
    padding: 0.8rem 1.5rem;
    background: white;
    border: 2px solid #3498db;
    border-radius: 6px;
    color: #3498db;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
}

.control-btn:hover {
    background: #3498db;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

.card-counter {
    background: white;
    padding: 0.8rem 1.5rem;
    border-radius: 6px;
    font-weight: 600;
    color: #2c3e50;
    border: 2px solid #e0e0e0;
}

/* Flashcard Wrapper */
.flashcard-wrapper {
    perspective: 1000px;
    margin-bottom: 2rem;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Flashcard */
.flashcard {
    width: 100%;
    max-width: 600px;
    height: 400px;
    position: relative;
    cursor: pointer;
    margin: 0 auto;
}

.flashcard:focus {
    outline: 3px solid #3498db;
    outline-offset: 5px;
    border-radius: 12px;
}

.flashcard-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

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

.flashcard-front,
.flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

.flashcard-front {
    background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
    color: white;
}

.flashcard-back {
    background: linear-gradient(135deg, #27ae60 0%, #229954 100%);
    color: white;
    transform: rotateY(180deg);
}

.card-label {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    opacity: 0.9;
    margin-bottom: 1rem;
    font-weight: 600;
}

.card-term {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    word-wrap: break-word;
}

.card-hint {
    font-size: 0.9rem;
    opacity: 0.8;
    font-style: italic;
    margin-top: auto;
}

.card-definition {
    font-size: 1.3rem;
    text-align: center;
    line-height: 1.8;
    word-wrap: break-word;
}

/* Navigation Buttons */
.flashcards-navigation {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
}

.nav-btn {
    padding: 1rem 2rem;
    background: white;
    border: 2px solid #2c3e50;
    border-radius: 6px;
    color: #2c3e50;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
}

.nav-btn:hover:not(:disabled) {
    background: #2c3e50;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(44, 62, 80, 0.3);
}

.nav-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Card List Section */
.card-list-section {
    margin-top: 3rem;
}

.card-list-section h2 {
    font-size: 2rem;
    color: #2c3e50;
    text-align: center;
    margin-bottom: 0.5rem;
}

.card-list-subtitle {
    text-align: center;
    color: #7f8c8d;
    margin-bottom: 2rem;
}

.card-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
}

.card-list-item {
    background: white;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    color: #2c3e50;
}

.card-list-item:hover {
    border-color: #3498db;
    background: #f0f7ff;
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.2);
}

.card-list-item.active {
    border-color: #3498db;
    background: #e8f4f8;
    color: #3498db;
}

/* Footer */
.main-footer {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 2rem;
    margin-top: auto;
}

.main-footer p {
    margin-bottom: 0.5rem;
}

.main-footer strong {
    color: #3498db;
}

.main-footer b {
    color: #0de546;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 60px;
        flex-direction: column;
        background: #2c3e50;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 2rem 0;
        gap: 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        width: 100%;
    }

    .nav-menu a {
        display: block;
        padding: 1rem;
        width: 100%;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .flashcards-container {
        padding: 2rem 15px;
    }

    .flashcards-header h1 {
        font-size: 2rem;
    }

    .flashcard {
        height: 350px;
    }

    .card-term {
        font-size: 2rem;
    }

    .card-definition {
        font-size: 1.1rem;
    }

    .flashcards-navigation {
        flex-direction: column;
    }

    .nav-btn {
        width: 100%;
    }

    .card-list {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
}

@media (max-width: 480px) {
    .flashcards-header h1 {
        font-size: 1.75rem;
    }

    .flashcard {
        height: 300px;
    }

    .card-term {
        font-size: 1.5rem;
    }

    .card-definition {
        font-size: 1rem;
    }

    .flashcard-front,
    .flashcard-back {
        padding: 1.5rem;
    }
}