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

:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --border-color: #30363d;
    --accent-green: #39d353;
}

body {
    font-family: 'Space Grotesk', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

#confetti-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1000;
}

.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: linear-gradient(180deg, #0d1117 0%, #161b22 100%);
}

.header {
    padding: 1.5rem 2rem;
    background: linear-gradient(135deg, rgba(57, 211, 83, 0.1) 0%, rgba(38, 166, 65, 0.05) 100%);
    border-bottom: 1px solid var(--border-color);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, #39d353, #26a641);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-stats {
    display: flex;
    gap: 1rem;
}

.stat-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border-radius: 999px;
    border: 1px solid var(--border-color);
}

.stat-icon {
    font-size: 1.1rem;
}

.stat-value {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
    color: var(--accent-green);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.motivation-toast {
    position: fixed;
    top: 100px;
    left: 50%;
    transform: translateX(-50%);
    padding: 1rem 2rem;
    background: linear-gradient(135deg, #39d353, #26a641);
    color: #0d1117;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1.1rem;
    z-index: 999;
    animation: toastIn 0.3s ease, toastOut 0.3s ease 1.7s;
    box-shadow: 0 10px 40px rgba(57, 211, 83, 0.4);
}

@keyframes toastIn {
    from { opacity: 0; transform: translateX(-50%) translateY(-20px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

@keyframes toastOut {
    to { opacity: 0; transform: translateX(-50%) translateY(-20px); }
}

.main-content {
    flex: 1;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.habit-selector {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.habit-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.95rem;
}

.habit-btn:hover {
    background: var(--bg-tertiary);
    transform: translateY(-2px);
}

.habit-btn.active {
    background: rgba(57, 211, 83, 0.15);
}

.habit-emoji {
    font-size: 1.2rem;
}

.habit-name {
    font-weight: 500;
}

.delete-habit-btn {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #f85149;
    border: none;
    color: white;
    font-size: 14px;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.habit-btn:hover .delete-habit-btn {
    opacity: 1;
}

.add-habit-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.add-habit-btn:hover {
    border-color: var(--accent-green);
    color: var(--accent-green);
}

.add-habit-form {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.habit-input {
    flex: 1;
    min-width: 150px;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.95rem;
}

.emoji-input {
    width: 60px;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    text-align: center;
    font-size: 1.2rem;
}

.save-habit-btn {
    padding: 0.75rem 1.5rem;
    background: var(--accent-green);
    border: none;
    border-radius: 8px;
    color: #0d1117;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: 'Space Grotesk', sans-serif;
}

.save-habit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(57, 211, 83, 0.4);
}

.graph-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    overflow-x: auto;
    margin-bottom: 2rem;
}

.graph-wrapper {
    min-width: max-content;
}

.month-labels {
    display: flex;
    gap: 3px;
    padding-left: 32px;
    margin-bottom: 0.5rem;
    position: relative;
}

.month-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--text-secondary);
    position: absolute;
}

.graph-grid-container {
    display: flex;
    gap: 4px;
}

.day-labels {
    display: flex;
    flex-direction: column;
    gap: 3px;
    padding-right: 8px;
}

.day-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    color: var(--text-secondary);
    height: 13px;
    display: flex;
    align-items: center;
}

.contribution-grid {
    display: flex;
    gap: 3px;
}

.week-column {
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.day-square {
    width: 13px;
    height: 13px;
    border-radius: 3px;
    transition: all 0.15s ease;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.day-square.clickable {
    cursor: pointer;
}

.day-square.clickable:hover {
    transform: scale(1.3);
    z-index: 10;
    box-shadow: 0 0 10px rgba(57, 211, 83, 0.5);
}

.day-square.completed {
    animation: popIn 0.3s ease;
}

@keyframes popIn {
    0% { transform: scale(0.5); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

.day-square.disabled {
    cursor: not-allowed;
}

.stats-panel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    text-align: center;
    transition: transform 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
}

.stat-number {
    font-family: 'JetBrains Mono', monospace;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.fire-emoji {
    font-size: 1.5rem;
}

.stat-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.settings-panel {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin-bottom: 2rem;
}

.setting-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

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

.theme-btn {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
}

.theme-btn:hover {
    transform: scale(1.15);
}

.theme-btn.active {
    border-color: white;
    box-shadow: 0 0 10px currentColor;
}

.sound-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.sound-toggle input {
    display: none;
}

.footer {
    padding: 1.5rem 2rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.85rem;
}

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

.footer-link {
    color: var(--accent-green);
    text-decoration: none;
    transition: opacity 0.2s;
}

.footer-link:hover {
    opacity: 0.8;
}

@media (max-width: 640px) {
    .header {
        padding: 1rem;
    }
    
    .title {
        font-size: 1.25rem;
    }
    
    .header-stats {
        width: 100%;
        justify-content: center;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    .habit-btn {
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
    }
    
    .day-square {
        width: 11px;
        height: 11px;
    }
    
    .stats-panel {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
    
    .settings-panel {
        flex-direction: column;
        gap: 1rem;
    }
}