:root {
    --primary: #1a73e8;
    --primary-hover: #1557b0;
    --secondary: #5f6368;
    --success: #34a853;
    --error: #ea4335;
    --warning: #fbbc04;
    --surface: #ffffff;
    --surface-variant: #f8f9fa;
    --outline: #dadce0;
    --outline-variant: #e8eaed;
    --on-surface: #202124;
    --on-surface-variant: #5f6368;
    --shadow: 0 2px 8px rgba(0,0,0,0.1);
    --shadow-elevated: 0 4px 16px rgba(0,0,0,0.12);
    --border-radius: 12px;
    --border-radius-small: 8px;
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
    :root {
        --surface: #1f1f1f;
        --surface-variant: #2d2d2d;
        --outline: #5f6368;
        --outline-variant: #444746;
        --on-surface: #e8eaed;
        --on-surface-variant: #9aa0a6;
    }
}

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

body {
    font-family: 'Google Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
    line-height: 1.6;
    color: var(--on-surface);
    background: var(--surface-variant);
    font-size: 16px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
header {
    background: var(--surface);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--outline-variant);
}

nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    gap: 20px;
}

.logo {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo::before {
    content: "📅";
    font-size: 1.1em;
}

/* Team Selector */
.team-selector {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    align-items: center;
}

.team-selector label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--on-surface-variant);
    margin-right: 12px;
}

.team-btn {
    padding: 8px 16px;
    border: 2px solid var(--outline);
    background: var(--surface);
    color: var(--on-surface);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.8rem;
    font-weight: 500;
    text-decoration: none;
    display: inline-block;
    min-width: 70px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.team-btn:hover {
    border-color: var(--primary);
    background: var(--surface-variant);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.team-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    box-shadow: var(--shadow-elevated);
}

.team-btn:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Main Content */
main {
    padding: 20px 0 32px;
}

.page-title {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--on-surface);
    text-align: center;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--on-surface);
    display: flex;
    align-items: center;
    gap: 12px;
}

.section-title::before {
    content: "";
    width: 4px;
    height: 20px;
    background: var(--primary);
    border-radius: 2px;
}

/* On-Call Section */
.on-call-section {
    margin-bottom: 32px;
}

.on-call-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}

.on-call-card {
    background: var(--surface);
    border-radius: var(--border-radius);
    padding: 16px;
    box-shadow: var(--shadow);
    text-align: center;
    border: 2px solid var(--success);
    position: relative;
    transition: var(--transition);
}

.on-call-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-elevated);
}

.on-call-card::before {
    content: "🟢";
    position: absolute;
    top: 12px;
    right: 12px;
    font-size: 1rem;
}

.on-call-card h3 {
    color: var(--success);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.on-call-card .user {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--on-surface);
    text-transform: uppercase;
    margin: 6px 0;
    padding: 6px 12px;
    background: var(--surface-variant);
    border-radius: var(--border-radius-small);
    display: inline-block;
    min-width: 50px;
}

/* Schedule Section */
.schedules-section {
    margin-bottom: 32px;
}

.team-schedule {
    margin-bottom: 24px;
    background: var(--surface);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.team-schedule h3 {
    background: var(--surface-variant);
    padding: 12px 16px;
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--on-surface);
    border-bottom: 1px solid var(--outline-variant);
}

.schedule-table {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8rem;
}

th, td {
    padding: 8px 12px;
    text-align: left;
    border-bottom: 1px solid var(--outline-variant);
}

th {
    background: var(--surface-variant);
    font-weight: 600;
    color: var(--on-surface);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: sticky;
    top: 0;
    z-index: 10;
}

tr.weekend {
    background: rgba(251, 188, 4, 0.1);
}

tr:hover:not(.weekend) {
    background: var(--surface-variant);
}

.schedule-date {
    font-weight: 500;
    white-space: nowrap;
    min-width: 140px;
    font-size: 0.8rem;
}

.schedule-day {
    font-weight: 500;
    color: var(--on-surface-variant);
    min-width: 80px;
    font-size: 0.75rem;
}

.schedule-person {
    line-height: 1.4;
}

.schedule-user {
    text-transform: uppercase;
    font-weight: 600;
    color: var(--primary);
    font-size: 0.9rem;
}

/* Footer */
.update-info {
    text-align: center;
    padding: 12px 0;
    color: var(--on-surface-variant);
    font-size: 0.8rem;
    border-top: 1px solid var(--outline-variant);
    margin-top: 24px;
}

/* Loading States */
.loading {
    text-align: center;
    padding: 32px;
    color: var(--on-surface-variant);
    font-size: 1rem;
}

.loading::before {
    content: "⏳";
    font-size: 1.5rem;
    display: block;
    margin-bottom: 12px;
}

/* Error States */
.error {
    background: rgba(234, 67, 53, 0.1);
    color: var(--error);
    padding: 20px;
    border-radius: var(--border-radius);
    margin: 20px 0;
    border: 1px solid rgba(234, 67, 53, 0.3);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 12px;
    }

    nav {
        flex-direction: column;
        gap: 12px;
        padding: 12px 0;
    }

    .team-selector {
        justify-content: center;
    }

    .page-title {
        font-size: 1.6rem;
    }

    .section-title {
        font-size: 1.3rem;
    }

    .on-call-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    table {
        font-size: 0.75rem;
    }

    th, td {
        padding: 6px 8px;
    }

    .schedule-date {
        min-width: 120px;
    }

    .schedule-person {
        padding-left: 12px;
    }

    .team-btn {
        min-width: 60px;
        padding: 6px 12px;
        font-size: 0.75rem;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus indicators */
:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
    border-radius: var(--border-radius-small);
}

/* Team filtering with CSS */
.team-item.hidden {
    display: none;
}

.team-item {
    display: block;
}