/* CSS Variables for consistent theming */
:root {
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-text: #1f2937;
    --color-text-light: #6b7280;
    --color-text-lighter: #9ca3af;
    --color-background: #ffffff;
    --color-background-alt: #f9fafb;
    --color-border: #e5e7eb;
    --color-accent: #fef3c7;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --border-radius: 0.5rem;
    --max-width: 70ch;
}

/* Base styles */
html {
    max-width: var(--max-width);
    padding: var(--spacing-md);
    margin: auto;
    line-height: 1.6;
    font-size: 16px;
}

@media (min-width: 768px) {
    html {
        font-size: 18px;
        padding: var(--spacing-xl);
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--color-text);
    background-color: var(--color-background);
    margin: 0;
}

/* Header & Logo */
header {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--color-border);
}

h1.logo {
    margin: 0 0 var(--spacing-sm) 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.025em;
}

h1.logo a {
    color: var(--color-text);
    text-decoration: none;
}

h1.logo a:hover {
    color: var(--color-primary);
}

header > div > div {
    color: var(--color-text-light);
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
}

/* Typography */
h2 {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
    font-size: 1.5rem;
    color: var(--color-text);
}

h2.day-heading {
    margin: 0;
    padding: var(--spacing-sm) 0;
    font-size: 0.875rem;
    min-width: 90px;
    text-align: left;
    color: var(--color-text-light);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

h2.day-heading a {
    color: var(--color-text-light);
    text-decoration: none;
}

h2.day-heading a:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

h3.time-heading {
    margin: 0;
    padding: var(--spacing-xs) 0;
    width: 90px;
    font-size: 0.875rem;
    text-align: right;
    color: var(--color-text-lighter);
    font-weight: 400;
    float: left;
}

/* Links */
a {
    color: var(--color-primary);
    text-decoration: none;
}

a:hover {
    color: var(--color-primary-hover);
    text-decoration: underline;
}

a:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Navigation */
nav {
    margin-top: var(--spacing-md);
    font-size: 0.9rem;
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm) var(--spacing-md);
}

nav a,
nav span {
    white-space: nowrap;
}

nav [aria-current="page"] {
    font-weight: 600;
    color: var(--color-text);
}

/* Newsletter Subscribe */
#subscribe {
    background: linear-gradient(135deg, var(--color-accent) 0%, #fde68a 100%);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-xl);
    border-left: 4px solid #f59e0b;
}

#subscribe a {
    font-weight: 600;
}

/* Day Containers */
.day-container {
    padding: var(--spacing-lg) 0;
    border-bottom: 1px solid var(--color-border);
}

.day-container:last-child {
    border-bottom: none;
}

.even {
    background-color: var(--color-background-alt);
    margin: 0 calc(-1 * var(--spacing-md));
    padding: var(--spacing-lg) var(--spacing-md);
    border-radius: var(--border-radius);
}

@media (min-width: 768px) {
    .even {
        margin: 0 calc(-1 * var(--spacing-xl));
        padding: var(--spacing-lg) var(--spacing-xl);
    }
}

/* Time Slots */
.time-slot {
    margin-bottom: var(--spacing-md);
}

/* Events */
.event {
    margin-left: 100px;
    line-height: 1.5;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    background: var(--color-background);
    border-radius: calc(var(--border-radius) * 0.75);
    transition: transform 0.2s, box-shadow 0.2s;
}

.even .event {
    background: var(--color-background);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.event:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.event .p-name {
    font-weight: 600;
    font-size: 1.05rem;
    color: var(--color-primary);
}

.event .p-name:hover {
    color: var(--color-primary-hover);
}

.event .event-details {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-top: var(--spacing-sm);
}

.event-location,
.p-organizer {
    margin-top: var(--spacing-xs);
}

.dt-start {
    display: none;
}

/* Footer */
footer {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 2px solid var(--color-border);
    color: var(--color-text-light);
    font-size: 0.9rem;
}

/* Accessibility */
.skip-link {
    position: absolute;
    top: -100px;
    left: 0;
    background: #000;
    color: #fff;
    padding: var(--spacing-sm) var(--spacing-md);
    text-decoration: none;
    z-index: 100;
    border-radius: var(--border-radius);
}

.skip-link:focus {
    top: var(--spacing-sm);
    left: var(--spacing-sm);
}

/* Groups Page */
.groups-container ul {
    list-style: none;
    padding: 0;
    display: grid;
    gap: var(--spacing-md);
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
}

.group-card {
    padding: var(--spacing-md);
    background: var(--color-background-alt);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    transition: transform 0.2s, box-shadow 0.2s;
}

.group-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.group-card a {
    font-weight: 500;
    display: block;
}

.suggest-group {
    background: var(--color-background-alt);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid var(--color-primary);
}

/* Week Page */
.week-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--color-border);
}

.week-header h1 {
    margin-bottom: var(--spacing-sm);
}

.week-header p {
    margin: 0;
    font-size: 0.95rem;
}