/* ============================================
   Base Styles - Shared across all pages
   ============================================ */

/* Light Theme (Default) */
:root {
    --primary-color: #1a365d;
    --secondary-color: #2c5282;
    --accent-color: #3182ce;
    --background-color: #d2d2d2;
    --card-background: #ffffff;
    --text-color: #2d3748;
    --text-muted: #718096;
    --border-color: #e2e8f0;
    --success-color: #48bb78;
    --warning-color: #ed8936;
    --chart-grid-color: rgba(226, 232, 240, 0.8);
    --header-gradient-start: #1a365d;
    --header-gradient-end: #2c5282;
    --week-header-start: #2c5282;
    --week-header-end: #3182ce;
    --table-header-bg: #1a365d;
    --table-header-text: #ffffff;
}

/* Dark Theme - Auto-detected from system preferences */
@media (prefers-color-scheme: dark) {
    :root {
        --primary-color: #90cdf4;
        --secondary-color: #63b3ed;
        --accent-color: #4299e1;
        --background-color: #192837;
        --card-background: #2d3748;
        --text-color: #e2e8f0;
        --text-muted: #a0aec0;
        --border-color: #4a5568;
        --success-color: #68d391;
        --warning-color: #f6ad55;
        --chart-grid-color: rgba(74, 85, 104, 0.8);
        --header-gradient-start: #2d3748;
        --header-gradient-end: #1a202c;
        --week-header-start: #2d3748;
        --week-header-end: #4a5568;
        --table-header-bg: #2c5282;
        --table-header-text: #e2e8f0;
    }
}

/* ============================================
   Base Elements
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

/* ============================================
   Utility Classes
   ============================================ */
.card {
    background: var(--card-background);
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.header-box {
    background: rgba(255, 255, 255, 0.1);
    padding: 0.75rem 1.25rem;
    border-radius: 8px;
}

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

.section-title {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.section-subtitle {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.stat-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

/* ============================================
   Main Content
   ============================================ */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}