:root {
    --bg-primary: #faf8f5;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f5f1eb;
    --text-primary: #2c2416;
    --text-secondary: #6b5d4f;
    --text-tertiary: #8f8273;
    --accent-primary: #7c9885;
    --accent-secondary: #a8b8a0;
    --accent-warm: #d4a574;
    --border-color: #e8e2d8;
    --shadow-sm: 0 2px 8px rgba(44, 36, 22, 0.08);
    --shadow-md: 0 4px 16px rgba(44, 36, 22, 0.12);
    --shadow-lg: 0 8px 32px rgba(44, 36, 22, 0.16);
}

[data-theme="dark"] {
    --bg-primary: #1a1612;
    --bg-secondary: #252119;
    --bg-tertiary: #2d271f;
    --text-primary: #f5f1eb;
    --text-secondary: #c7bfb3;
    --text-tertiary: #9b9186;
    --accent-primary: #8fa896;
    --accent-secondary: #6b8570;
    --accent-warm: #c99a65;
    --border-color: #3d362a;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.theme-toggle:hover {
    transform: rotate(20deg) scale(1.1);
    box-shadow: var(--shadow-lg);
}

.theme-toggle .sun-icon {
    display: block;
    color: var(--accent-warm);
}

.theme-toggle .moon-icon {
    display: none;
    color: var(--accent-primary);
}

[data-theme="dark"] .theme-toggle .sun-icon {
    display: none;
}

[data-theme="dark"] .theme-toggle .moon-icon {
    display: block;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px;
}

header h1 {
    font-size: 3em;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 1.2em;
    color: var(--text-secondary);
    font-weight: 400;
}

.round-info {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 20px;
    flex-wrap: wrap;
}

.round-badge, .score-badge, .cache-badge {
    padding: 8px 20px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 50px;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.95em;
    box-shadow: var(--shadow-sm);
}

.round-badge span, .score-badge span, .cache-badge span {
    color: var(--accent-primary);
    font-weight: 700;
}

.loading-screen {
    background: var(--bg-secondary);
    border-radius: 24px;
    padding: 80px 40px;
    text-align: center;
    box-shadow: var(--shadow-lg);
    border: 2px solid var(--border-color);
}

.loading-content p {
    font-size: 1.3em;
    color: var(--text-primary);
    margin-bottom: 8px;
    font-weight: 600;
}

.loading-content small {
    color: var(--text-tertiary);
    font-size: 0.95em;
}

.spinner {
    border: 4px solid var(--bg-tertiary);
    border-top: 4px solid var(--accent-primary);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    animation: spin 1s linear infinite;
    margin: 0 auto 24px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.game-layout {
    display: grid;
    grid-template-columns: 1fr 500px;
    gap: 30px;
    align-items: start;
}

@media (max-width: 1200px) {
    .game-layout {
        grid-template-columns: 1fr;
    }
}

.paper-section {
    position: sticky;
    top: 20px;
}

.paper-frame {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 20px;
    box-shadow: var(--shadow-lg);
    border: 2px solid var(--border-color);
}

.paper-label {
    font-size: 0.85em;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-tertiary);
    font-weight: 700;
    margin-bottom: 15px;
}

.paper-display {
    background: var(--bg-tertiary);
    border-radius: 12px;
    padding: 20px;
    max-height: 600px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
}

.paper-display img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

.paper-display::-webkit-scrollbar {
    width: 8px;
}

.paper-display::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: 4px;
}

.paper-display::-webkit-scrollbar-thumb {
    background: var(--accent-secondary);
    border-radius: 4px;
}

.paper-display::-webkit-scrollbar-thumb:hover {
    background: var(--accent-primary);
}

.guess-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.guess-card, .results-card {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 32px;
    box-shadow: var(--shadow-lg);
    border: 2px solid var(--border-color);
}

.guess-card h2, .results-card h2 {
    font-size: 1.8em;
    color: var(--text-primary);
    margin-bottom: 8px;
    font-weight: 700;
}

.hint {
    color: var(--text-tertiary);
    font-size: 0.95em;
    margin-bottom: 32px;
}

.input-wrapper {
    margin-bottom: 24px;
}

.input-wrapper label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
    font-size: 1.05em;
}

.label-icon {
    font-size: 1.2em;
}

.input-field {
    width: 100%;
    padding: 14px 16px;
    font-size: 1.05em;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    transition: all 0.3s ease;
    font-weight: 500;
}

.input-field:focus {
    outline: none;
    border-color: var(--accent-primary);
    background: var(--bg-secondary);
    box-shadow: 0 0 0 4px rgba(124, 152, 133, 0.1);
}

.input-hint {
    display: block;
    color: var(--text-tertiary);
    font-size: 0.85em;
    margin-top: 6px;
}

.btn-primary, .btn-secondary {
    padding: 14px 28px;
    font-size: 1.05em;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    justify-content: center;
    text-decoration: none;
}

.btn-primary {
    background: var(--accent-primary);
    color: white;
    width: 100%;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
    background: var(--accent-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-secondary);
    border-color: var(--accent-primary);
}

.results-header {
    text-align: center;
    margin-bottom: 24px;
}

.paper-info {
    background: var(--bg-tertiary);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 24px;
    border: 1px solid var(--border-color);
}

.paper-info h3 {
    color: var(--text-primary);
    font-size: 1.1em;
    margin-bottom: 12px;
    line-height: 1.5;
}

.paper-meta {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.meta-item {
    color: var(--text-secondary);
    font-size: 0.95em;
}

.meta-item strong {
    color: var(--text-primary);
}

.feedback-section {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 24px;
}

.feedback-item {
    background: var(--bg-tertiary);
    padding: 16px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.feedback-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    font-size: 0.95em;
}

.feedback-icon {
    font-size: 1.3em;
}

.feedback-value {
    font-size: 1.15em;
    font-weight: 600;
    color: var(--accent-primary);
}

.action-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

@media (max-width: 600px) {
    .action-buttons {
        grid-template-columns: 1fr;
    }
}

footer {
    text-align: center;
    margin-top: 60px;
    padding: 30px 20px;
    color: var(--text-tertiary);
    font-size: 0.9em;
}

footer p {
    margin: 6px 0;
}

footer a {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 600;
}

footer a:hover {
    text-decoration: underline;
}

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

.results-card {
    animation: fadeIn 0.5s ease-out;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2.2em;
    }
    
    .theme-toggle {
        top: 15px;
        right: 15px;
        width: 44px;
        height: 44px;
    }
    
    .guess-card, .results-card {
        padding: 24px;
    }
}