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

:root {
    --bg-color: #0f1419;
    --card-bg: #1a1f26;
    --card-border: #2d333b;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --accent: #58a6ff;
    --accent-green: #3fb950;
    --accent-yellow: #d29922;
    --accent-red: #f85149;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Loading state */
.loading {
    text-align: center;
    padding: 4rem 0;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--card-border);
    border-top-color: var(--accent);
    border-radius: 50%;
    margin: 0 auto 1rem;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Error state */
.error {
    text-align: center;
    padding: 2rem;
    background: var(--card-bg);
    border: 1px solid var(--accent-red);
    border-radius: 8px;
}

.error p {
    color: var(--accent-red);
    margin-bottom: 1rem;
}

.error button {
    background: var(--accent-red);
    color: white;
    border: none;
    padding: 0.5rem 1.5rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
}

/* Dashboard grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 1.25rem;
}

.stat-card.highlight {
    border-color: var(--accent);
    background: linear-gradient(135deg, rgba(88, 166, 255, 0.1) 0%, var(--card-bg) 100%);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.stat-value {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.stat-secondary {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Progress bar */
.progress-section {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 1.25rem;
    margin-bottom: 2rem;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.75rem;
    font-size: 0.875rem;
}

.progress-bar {
    height: 8px;
    background: var(--card-border);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-green) 100%);
    border-radius: 4px;
    transition: width 0.5s ease;
    width: 0%;
}

/* Footer */
footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--card-border);
}

footer p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

#refresh-btn {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--card-border);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
    transition: border-color 0.2s;
}

#refresh-btn:hover {
    border-color: var(--accent);
}

#refresh-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.sign-out {
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-decoration: none;
    margin-left: 1rem;
}

.sign-out:hover {
    color: var(--text-primary);
}

/* Utility */
.hidden {
    display: none !important;
}

/* Color coding for avg hours */
.stat-value.on-track { color: var(--accent-green); }
.stat-value.warning { color: var(--accent-yellow); }
.stat-value.behind { color: var(--accent-red); }

/* Responsive */
@media (max-width: 600px) {
    .container {
        padding: 1rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .stat-value {
        font-size: 1.5rem;
    }
}