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

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --error-color: #ef4444;
    --background: #0f172a;
    --card-bg: #1e293b;
    --card-hover: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --border-color: #475569;
    --shadow: rgba(0, 0, 0, 0.3);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--text-primary);
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

header {
    text-align: center;
    padding: 30px 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 20px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px var(--shadow);
}

h1 {
    font-size: 3rem;
    margin-bottom: 10px;
    background: linear-gradient(45deg, #fff, #e0e7ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: bold;
}

.subtitle {
    font-size: 1.2rem;
    color: #e0e7ff;
    font-weight: 300;
}

.game-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 30px;
}

.info-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 4px 15px var(--shadow);
    display: flex;
    flex-direction: column;
    gap: 8px;
    border: 1px solid var(--border-color);
}

.info-card .label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.info-card .value {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.help-card {
    justify-content: center;
}

.help-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 10px;
    font-size: 1rem;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    font-weight: 600;
}

.help-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

.help-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.help-modal.visible {
    display: flex;
    animation: fadeIn 0.3s ease;
}

.help-content {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 20px;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 20px 60px var(--shadow);
    border: 1px solid var(--border-color);
}

.close-help {
    position: absolute;
    top: 15px;
    right: 15px;
    background: var(--card-hover);
    border: none;
    color: var(--text-primary);
    width: 35px;
    height: 35px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.5rem;
    transition: background 0.2s;
}

.close-help:hover {
    background: var(--border-color);
}

.help-content h2 {
    margin-bottom: 20px;
    color: var(--primary-color);
}

.help-content h3 {
    margin-top: 20px;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.help-section {
    margin: 20px 0;
}

.help-text p {
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 15px;
}

.help-text ol, .help-text ul {
    margin-left: 20px;
    line-height: 1.8;
    color: var(--text-secondary);
}

.feedback-example {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 10px;
}

.example-item {
    display: flex;
    align-items: center;
    gap: 15px;
}

.feedback-circle-demo {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 3px solid var(--border-color);
    flex-shrink: 0;
}

.feedback-circle-demo.black {
    background-color: #000;
}

.feedback-circle-demo.white {
    background-color: #fff;
}

.difficulty-selector {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 30px var(--shadow);
    text-align: center;
    border: 1px solid var(--border-color);
}

.difficulty-selector h3 {
    font-size: 1.8rem;
    margin-bottom: 30px;
    color: var(--text-primary);
}

.difficulty-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.difficulty-btn {
    background: var(--card-hover);
    border: 2px solid var(--border-color);
    padding: 25px 15px;
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.difficulty-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px var(--shadow);
    border-color: var(--primary-color);
}

.difficulty-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-color: var(--primary-color);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
}

.diff-title {
    font-size: 1.3rem;
    font-weight: bold;
    color: var(--text-primary);
}

.diff-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.difficulty-btn.active .diff-desc {
    color: #e0e7ff;
}

.start-game-btn {
    background: linear-gradient(135deg, var(--success-color), #059669);
    color: white;
    border: none;
    padding: 15px 50px;
    border-radius: 12px;
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
}

.start-game-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.4);
}

.game-area {
    display: none;
}

.game-area.visible {
    display: block;
    animation: fadeIn 0.5s ease;
}

.game-section {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 20px;
    margin-bottom: 25px;
    box-shadow: 0 10px 30px var(--shadow);
    border: 1px solid var(--border-color);
}

.section-header h2 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.color-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
    margin-bottom: 30px;
}

.color-button-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.color-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: 4px solid var(--border-color);
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 15px var(--shadow);
}

.color-btn:hover {
    transform: scale(1.15);
    box-shadow: 0 6px 25px rgba(0, 0, 0, 0.5);
    border-color: white;
}

.color-btn:active {
    transform: scale(1.05);
}

.color-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.current-guess-section {
    margin: 30px 0;
}

.current-guess-section h2 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    text-align: center;
    color: var(--text-primary);
}

.current-guess {
    display: flex;
    gap: 15px;
    justify-content: center;
    padding: 20px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 15px;
}

.guess-slot {
    width: 55px;
    height: 55px;
    border-radius: 50%;
    border: 3px solid var(--border-color);
    background: rgba(255, 255, 255, 0.1);
    transition: all 0.3s;
    position: relative;
}

.guess-slot.filled {
    background-color: var(--slot-color);
    border-color: white;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
    animation: fillSlot 0.3s ease;
}

.guess-slot::after {
    content: '';
    position: absolute;
    top: 10%;
    left: 15%;
    width: 30%;
    height: 30%;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    opacity: 0;
}

.guess-slot.filled::after {
    opacity: 1;
}

.action-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-top: 25px;
}

.action-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px 35px;
    font-size: 1.1rem;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s;
    box-shadow: 0 4px 15px var(--shadow);
}

.action-btn .btn-icon {
    font-size: 1.3rem;
}

.clear-btn {
    background: var(--card-hover);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.clear-btn:hover {
    background: var(--border-color);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--shadow);
}

.submit-btn {
    background: linear-gradient(135deg, var(--success-color), #059669);
    color: white;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(16, 185, 129, 0.5);
}

.submit-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.previous-guesses-section {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 10px 30px var(--shadow);
    display: none;
    border: 1px solid var(--border-color);
}

.previous-guesses-section.visible {
    display: block;
    animation: slideUp 0.5s ease;
}

.previous-guesses-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.previous-guess {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.3s;
    animation: slideIn 0.5s ease;
}

.previous-guess:hover {
    background: rgba(0, 0, 0, 0.3);
    transform: translateX(5px);
}

.guess-number {
    font-weight: bold;
    font-size: 1.2rem;
    color: var(--primary-color);
    min-width: 30px;
}

.guess-colors {
    display: flex;
    gap: 10px;
    flex: 1;
}

.guess-colors .guess-slot {
    width: 45px;
    height: 45px;
}

.feedback {
    display: flex;
    gap: 15px;
    align-items: center;
}

.feedback-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 15px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
}

.feedback-item span {
    font-weight: bold;
    margin-right: 5px;
}

.feedback-circle {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
}

.correct-position {
    background-color: #000;
}

.correct-color {
    background-color: #fff;
}

.game-over {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 999;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.game-over.visible {
    display: flex;
    animation: fadeIn 0.5s ease;
}

.game-over-content {
    background: var(--card-bg);
    padding: 50px;
    border-radius: 25px;
    text-align: center;
    max-width: 600px;
    width: 100%;
    box-shadow: 0 20px 60px var(--shadow);
    border: 1px solid var(--border-color);
    animation: scaleIn 0.5s ease;
}

.game-over-icon {
    font-size: 5rem;
    margin-bottom: 20px;
}

.game-over-content h2 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.game-over-content p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.game-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin: 30px 0;
}

.stat-item {
    background: rgba(0, 0, 0, 0.3);
    padding: 20px;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary-color);
}

.secret-code-display {
    margin: 30px 0;
}

.secret-label {
    font-size: 1.1rem;
    margin-bottom: 15px;
    color: var(--text-secondary);
}

#secret-code-reveal {
    display: flex;
    gap: 15px;
    justify-content: center;
}

#secret-code-reveal .guess-slot {
    width: 55px;
    height: 55px;
}

.game-over-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.game-over-btn {
    padding: 15px 30px;
    font-size: 1.1rem;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s;
}

.game-over-btn.primary {
    background: linear-gradient(135deg, var(--success-color), #059669);
    color: white;
}

.game-over-btn.primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.5);
}

.game-over-btn.secondary {
    background: var(--card-hover);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.game-over-btn.secondary:hover {
    background: var(--border-color);
    transform: translateY(-3px);
}

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

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

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes fillSlot {
    from {
        transform: scale(0.8);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    header {
        padding: 20px;
    }

    .game-info {
        grid-template-columns: 1fr;
    }

    .difficulty-buttons {
        grid-template-columns: 1fr;
    }

    .game-section,
    .previous-guesses-section,
    .difficulty-selector,
    .game-over-content {
        padding: 20px;
    }

    .color-btn {
        width: 50px;
        height: 50px;
    }

    .guess-slot {
        width: 45px;
        height: 45px;
    }

    .action-buttons {
        flex-direction: column;
    }

    .action-btn {
        width: 100%;
    }

    .previous-guess {
        flex-wrap: wrap;
        gap: 15px;
    }

    .feedback {
        width: 100%;
    }

    .game-over-content h2 {
        font-size: 2rem;
    }

    .help-content {
        padding: 25px;
    }
}