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

body {
    font-family: Georgia, 'Times New Roman', serif;
    background: #f4f1eb;
    min-height: 100vh;
    padding: 20px;
    transition: background 0.3s, color 0.3s;
}

body.dark { background: #1a1a2e; color: #eee; }

header { text-align: center; margin-bottom: 20px; }

h1 { color: #2c3e50; font-weight: normal; font-size: 28px; margin-bottom: 8px; }
body.dark h1 { color: #ecf0f1; }

.subtitle { color: #666; font-size: 15px; margin-bottom: 12px; }
body.dark .subtitle { color: #aaa; }

.back-link {
    display: inline-block;
    color: #3498db;
    text-decoration: none;
    padding: 8px 20px;
    border: 1px solid #3498db;
    border-radius: 20px;
    transition: all 0.2s;
}

.back-link:hover { background: #3498db; color: white; }

.controls {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
}

.controls button {
    padding: 10px 15px;
    background: #3498db;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.controls button:hover { background: #2980b9; }

.game-tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 25px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 12px 25px;
    border: 2px solid #3498db;
    background: white;
    color: #3498db;
    border-radius: 25px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}

body.dark .tab-btn { background: #2d2d44; }

.tab-btn:hover, .tab-btn.active {
    background: #3498db;
    color: white;
}

.game-container {
    display: none;
    max-width: 700px;
    margin: 0 auto;
    background: white;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 3px 15px rgba(0,0,0,0.1);
}

body.dark .game-container { background: #2d2d44; }

.game-container.active { display: block; }

.game-header { text-align: center; margin-bottom: 25px; }

.game-header h3 { color: #2c3e50; font-weight: normal; margin-bottom: 8px; }
body.dark .game-header h3 { color: #ecf0f1; }

.game-header p { color: #888; font-size: 14px; margin-bottom: 15px; }

.game-stats {
    display: flex;
    justify-content: center;
    gap: 25px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.game-stats span { color: #666; font-size: 14px; }
body.dark .game-stats span { color: #aaa; }

.game-stats strong { color: #3498db; }

.game-header button {
    padding: 10px 25px;
    background: #3498db;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
}

.game-header button:hover { background: #2980b9; }


#memory-board {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    max-width: 400px;
    margin: 0 auto;
}

.memory-card {
    aspect-ratio: 1;
    background: #3498db;
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: white;
    transition: transform 0.3s, background 0.3s;
    user-select: none;
}

.memory-card:hover { transform: scale(1.05); }

.memory-card.flipped {
    background: #f8f9fa;
    color: #2c3e50;
}

body.dark .memory-card.flipped { background: #1a1a2e; color: #ecf0f1; }

.memory-card.matched {
    background: #27ae60;
    color: white;
    cursor: default;
}

.memory-card .card-content { display: none; }
.memory-card.flipped .card-content, .memory-card.matched .card-content { display: block; }
.memory-card .card-back { display: block; }
.memory-card.flipped .card-back, .memory-card.matched .card-back { display: none; }

.hangman-display { text-align: center; margin-bottom: 25px; }

#hangman-figure {
    font-size: 40px;
    margin-bottom: 20px;
    min-height: 50px;
}

#hangman-word {
    font-size: 32px;
    letter-spacing: 8px;
    font-family: 'Courier New', monospace;
    margin-bottom: 15px;
    color: #2c3e50;
}

body.dark #hangman-word { color: #ecf0f1; }

#hangman-hint {
    color: #888;
    font-size: 14px;
    font-style: italic;
}

#hangman-keyboard {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    max-width: 500px;
    margin: 0 auto 20px;
}

.key-btn {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 5px;
    background: #ecf0f1;
    color: #2c3e50;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.2s;
}

body.dark .key-btn { background: #1a1a2e; color: #eee; }

.key-btn:hover:not(:disabled) { background: #3498db; color: white; }

.key-btn:disabled { opacity: 0.3; cursor: default; }

.key-btn.correct { background: #27ae60; color: white; }
.key-btn.wrong { background: #e74c3c; color: white; }

#hangman-result {
    text-align: center;
    font-size: 18px;
    margin-bottom: 15px;
    min-height: 30px;
}

#hangman-result.win { color: #27ae60; }
#hangman-result.lose { color: #e74c3c; }

#hangman-next {
    display: block;
    margin: 0 auto;
    padding: 12px 30px;
    background: #27ae60;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
}

#hangman-next:hover { background: #219a52; }

.flashcard-container {
    perspective: 1000px;
    margin: 0 auto 25px;
    width: 300px;
    height: 200px;
}

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

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

.flashcard-front, .flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 15px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.flashcard-front {
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
    font-size: 48px;
    font-weight: bold;
}

.flashcard-back {
    background: #f8f9fa;
    color: #2c3e50;
    transform: rotateY(180deg);
    font-size: 24px;
}

body.dark .flashcard-back { background: #1a1a2e; color: #ecf0f1; }

.flashcard-controls {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 20px;
}

.flashcard-controls button {
    padding: 12px 30px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    color: white;
}

.btn-red { background: #e74c3c; }
.btn-red:hover { background: #c0392b; }
.btn-green { background: #27ae60; }
.btn-green:hover { background: #219a52; }

#flash-restart {
    display: block;
    margin: 0 auto;
    padding: 10px 25px;
    background: #95a5a6;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

#flash-restart:hover { background: #7f8c8d; }

#speed-display { text-align: center; margin-bottom: 25px; }

#speed-symbol {
    font-size: 72px;
    font-weight: bold;
    color: #3498db;
    margin-bottom: 20px;
    min-height: 90px;
}

#speed-input {
    width: 100%;
    max-width: 300px;
    padding: 15px;
    font-size: 18px;
    border: 2px solid #ddd;
    border-radius: 10px;
    text-align: center;
    margin-bottom: 15px;
}

body.dark #speed-input { background: #1a1a2e; color: #eee; border-color: #444; }

#speed-input:focus { outline: none; border-color: #3498db; }

#speed-feedback {
    font-size: 16px;
    min-height: 25px;
}

#speed-feedback.correct { color: #27ae60; }
#speed-feedback.wrong { color: #e74c3c; }

#speed-start {
    display: block;
    margin: 0 auto;
    padding: 15px 40px;
    background: #27ae60;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
}

#speed-start:hover { background: #219a52; }
#speed-start:disabled { background: #95a5a6; cursor: default; }

@media (max-width: 500px) {
    #memory-board { grid-template-columns: repeat(4, 1fr); gap: 6px; }
    .memory-card { font-size: 14px; }
    .key-btn { width: 32px; height: 32px; font-size: 14px; }
    #hangman-word { font-size: 24px; letter-spacing: 5px; }
    .flashcard-container { width: 260px; height: 170px; }
    .flashcard-front { font-size: 36px; }
    .flashcard-back { font-size: 20px; }
    #speed-symbol { font-size: 56px; }
    .game-tabs { gap: 5px; }
    .tab-btn { padding: 10px 15px; font-size: 12px; }
}