:root {
    --color-bg: #ffffff;
    --color-text: #1a1a1a;
    --color-heading: #003366;
    --color-link: #004d99;
    --color-link-visited: #5c2d91;
    --color-link-hover: #002244;
    --color-focus: #0056b3;
    --color-warning: #b30000;
    --color-border: #636363;
    --color-card-bg: #f7f8fa;
    --color-card-border: #c0c4cc;
    --color-summary-bg: #003366;
    --color-summary-text: #ffffff;
    --color-body-bg: #eef1f5;
    --color-schedule-warning-bg: #fef3cd;
    --color-schedule-warning-border: #856404;
    --color-schedule-warning-text: #533608;
    --color-error: #d32f2f;
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #1e1e1e;
        --color-text: #e0e0e0;
        --color-heading: #7fb3e0;
        --color-link: #5cacee;
        --color-link-visited: #b39ddb;
        --color-link-hover: #90caf9;
        --color-focus: #64b5f6;
        --color-warning: #ef5350;
        --color-border: #888888;
        --color-card-bg: #2a2a2a;
        --color-card-border: #555555;
        --color-summary-bg: #1a3a5c;
        --color-summary-text: #e0e0e0;
        --color-body-bg: #121212;
        --color-schedule-warning-bg: #4a3f00;
        --color-schedule-warning-border: #c9a900;
        --color-schedule-warning-text: #ffe082;
        --color-error: #ef5350;
    }
}

* { box-sizing: border-box; }

/* Screen reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-body-bg);
    max-width: 64rem;
    margin: 0 auto;
    padding: 1rem;
}

/* Focus indicator */
:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 2px;
}

h1 {
    color: var(--color-heading);
    font-size: 1.75rem;
    margin-bottom: 0.75rem;
}

h1:focus {
    outline: none;
}

h2 {
    color: var(--color-heading);
    font-size: 1.35rem;
    margin-top: 0;
    margin-bottom: 0.5rem;
}

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

a:visited {
    color: var(--color-link-visited);
}

a:hover, a:focus {
    color: var(--color-link-hover);
}

/* Region headings */
.region-heading {
    color: var(--color-heading);
    font-size: 1.15rem;
    margin: 1.25rem 0 0.4rem;
    padding-bottom: 0.25rem;
    border-bottom: 2px solid var(--color-card-border);
}

.region-heading:first-child {
    margin-top: 0;
}

/* Route cards on home page */
.route-list {
    list-style: none;
    padding: 0;
    margin: 1rem 0;
    display: grid;
    gap: 0.75rem;
}

.route-list li {
    border: 2px solid var(--color-card-border);
    border-radius: 0.5rem;
    background: var(--color-bg);
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.route-list a {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 1rem 1.25rem;
    text-decoration: none;
    color: var(--color-text);
    font-size: 1.1rem;
    font-weight: 600;
}

.route-list a::before {
    content: "\26F4\FE0F";
    font-size: 1.4rem;
    flex-shrink: 0;
}

.route-list a:hover,
.route-list a:focus {
    background: var(--color-heading);
    color: #fff;
    border-radius: 0.35rem;
}

/* Controls row */
.controls-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
    margin-bottom: 0.5rem;
}

/* Date picker */
.date-picker {
    /* no extra margin - handled by controls-row */
}

.date-picker label,
.limit-picker label {
    font-weight: 600;
    margin-right: 0.5rem;
}

.date-picker select,
.limit-picker select {
    font-size: 1rem;
    padding: 0.4rem 0.5rem;
    border: 2px solid var(--color-card-border);
    border-radius: 0.35rem;
    background: var(--color-bg);
    color: var(--color-text);
}

.date-picker select:focus-visible,
.limit-picker select:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 2px;
}

.schedule-warning {
    background: var(--color-schedule-warning-bg);
    border-left: 4px solid var(--color-schedule-warning-border);
    color: var(--color-schedule-warning-text);
    padding: 0.5rem 0.85rem;
    border-radius: 0 0.35rem 0.35rem 0;
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
}

/* Two-column layout for route page */
.columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    margin-top: 0.75rem;
}

.direction {
    min-width: 0;
    background: var(--color-bg);
    border: 2px solid var(--color-card-border);
    border-radius: 0.5rem;
    padding: 1rem 1.25rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.direction-heading {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

/* Summary banner */
.next-sailing-summary {
    background: var(--color-summary-bg);
    color: var(--color-summary-text);
    border-radius: 0.35rem;
    padding: 0.6rem 0.85rem;
    margin-bottom: 0.75rem;
    font-weight: 700;
    font-size: 0.95rem;
    min-height: 2.25rem;
}

/* Sailing list */
.sailing-list {
    list-style: none;
    padding: 0;
    margin: 0.5rem 0 0;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.sailing-list li {
    padding: 0.6rem 0.75rem;
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    border-radius: 0.35rem;
    font-size: 0.95rem;
    line-height: 1.5;
}

.sailing-list li:nth-child(1) {
    border-left: 4px solid var(--color-heading);
}

.sailing-warning {
    color: var(--color-warning);
    font-weight: 600;
    font-size: 0.85rem;
}

.vessel-tracking {
    color: var(--color-heading);
    font-size: 0.85rem;
    font-style: italic;
}

/* Error message */
.error-message {
    color: var(--color-error);
    font-weight: 600;
    font-style: italic;
    background: none;
    border: 2px dashed var(--color-error);
}

/* Webcams */
.webcams {
    margin-bottom: 0.75rem;
}

.webcam-img {
    display: block;
    width: 100%;
    max-height: 12rem;
    object-fit: cover;
    border: 1px solid var(--color-card-border);
    border-radius: 0.35rem;
}

.webcam-figure {
    margin: 0;
}

.camera-caption {
    font-size: 0.8rem;
    color: var(--color-border);
    margin: 0.25rem 0 0;
    font-style: italic;
    min-height: 1.2em;
}

/* Camera thumbnail buttons */
.camera-thumbs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 0.5rem;
}

.camera-thumb-btn {
    padding: 0.3rem 0.7rem;
    font-size: 0.8rem;
    border: 2px solid var(--color-card-border);
    border-radius: 0.35rem;
    background: var(--color-bg);
    color: var(--color-text);
    cursor: pointer;
    font-weight: 500;
}

.camera-thumb-btn:hover,
.camera-thumb-btn:focus-visible {
    background: var(--color-heading);
    color: #fff;
    border-color: var(--color-heading);
}

.camera-thumb-btn.active {
    background: var(--color-summary-bg);
    color: var(--color-summary-text);
    border-color: var(--color-summary-bg);
}

/* Navigation row */
.route-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

/* Back link */
.back-link {
    display: inline-block;
    font-size: 1rem;
}

/* Map link */
.map-link {
    font-size: 0.9rem;
    font-weight: 600;
}

/* Loading */
.loading {
    font-style: italic;
    color: var(--color-border);
    background: none;
    border-style: dashed;
}

/* Footer */
body > p:last-child {
    margin-top: 1.5rem;
    text-align: center;
    color: var(--color-border);
}

/* Responsive - stack columns on small screens */
@media (max-width: 40rem) {
    .columns {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .controls-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    body { padding: 0.75rem; }
    h1 { font-size: 1.4rem; }
    .direction-heading { font-size: 1.15rem; }

    .webcam-img {
        max-height: 10rem;
    }
}