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

:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-tertiary: #1a1a1a;
    --text-primary: #f5f5f5;
    --text-secondary: #888888;
    --text-muted: #444444;
    --border-color: #2a2a2a;
    --accent: #f5f5f5;
    --accent-dim: #333333;
    --success: #22c55e;
    --error: #ef4444;
}

body {
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    line-height: 1.6;
}

.game-container {
    width: 100%;
    max-width: 400px;
    padding: 24px;
}

.game-grid {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.header {
    text-align: left;
}

.header-line {
    width: 24px;
    height: 2px;
    background-color: var(--accent);
    margin-bottom: 16px;
}

h1 {
    font-size: 1.25rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: 8px;
}

.subtitle {
    font-size: 0.75rem;
    color: var(--text-secondary);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.attempts-display {
    display: flex;
    align-items: baseline;
    gap: 8px;
    padding: 16px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.attempts-display .label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.attempts-display .count {
    font-size: 2rem;
    font-weight: 300;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

.game-area {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.input-wrapper {
    position: relative;
}

input {
    width: 100%;
    padding: 16px 0;
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-primary);
    background: transparent;
    border: none;
    outline: none;
    font-variant-numeric: tabular-nums;
    transition: color 0.2s ease;
}

input::placeholder {
    color: var(--text-muted);
    transition: opacity 0.2s ease;
}

input:focus::placeholder {
    opacity: 0;
}

.input-line {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background-color: var(--border-color);
    transition: background-color 0.2s ease;
}

input:focus + .input-line {
    background-color: var(--accent);
}

input.error + .input-line {
    background-color: var(--error);
}

input.success + .input-line {
    background-color: var(--success);
}

.btn {
    padding: 16px 24px;
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    background-color: var(--text-primary);
    color: var(--bg-primary);
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn:hover {
    opacity: 0.9;
}

.btn:active {
    opacity: 1;
    transform: scale(0.98);
}

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

.btn-outline:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--text-primary);
}

.message-area {
    min-height: 48px;
    display: flex;
    align-items: center;
}

.message-text {
    font-size: 0.875rem;
    opacity: 0;
    transform: translateY(-4px);
    transition: all 0.3s ease;
}

.message-text.visible {
    opacity: 1;
    transform: translateY(0);
}

.message-text.hint {
    color: var(--text-secondary);
}

.message-text.success {
    color: var(--success);
}

.message-text.error {
    color: var(--error);
}

.stats-area {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    padding: 16px 0;
    border-top: 1px solid var(--border-color);
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-label {
    font-size: 0.625rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.stat-value {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
}

.footer {
    padding-top: 16px;
}

.footer-line {
    width: 100%;
    height: 1px;
    background-color: var(--border-color);
    margin-bottom: 16px;
}

.footer-text {
    font-size: 0.625rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-text::before {
    content: '';
    width: 6px;
    height: 6px;
    background-color: var(--success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.4;
    }
}

.hidden {
    display: none;
}

@media (max-width: 480px) {
    .game-container {
        padding: 16px;
    }

    .stats-area {
        gap: 8px;
    }

    .stat-value {
        font-size: 0.875rem;
    }
}