/* ═══════════════════════════════════════════
   surfclim — Main Stylesheet
   ═══════════════════════════════════════════ */

:root {
    --text:       #2c3e50;
    --text-muted: rgba(44, 62, 80, 0.6);
    --bg:         #ffffff;
    --bg-card:    #f8f9fa;
    --border:     rgba(0, 0, 0, 0.08);
    --accent:     #9467bd;
    --shadow:     0 1px 6px rgba(0, 0, 0, 0.08);
    --font:       'Open Sans', sans-serif;
    --radius:     8px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font);
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
a.brand { color: var(--text); }

.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ═══════════════════════════════════════════
   TOP BAR
   ═══════════════════════════════════════════ */
.top-bar {
    border-bottom: 1px solid var(--border);
    background: var(--bg);
    position: sticky;
    top: 0;
    z-index: 100;
}

.top-bar-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 52px;
    display: flex;
    align-items: center;
    gap: 24px;
}

.brand {
    font-weight: 800;
    font-size: 1.05rem;
    color: var(--text);
    letter-spacing: -0.3px;
    flex-shrink: 0;
}

/* ── Nav pill ── */
.pill-nav {
    display: flex;
    align-items: center;
}

.nav-pill {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text);
    opacity: 0.55;
    padding: 0 14px;
    line-height: 52px;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: opacity 0.2s, border-color 0.2s;
    white-space: nowrap;
    text-decoration: none;
    display: block;
}

.nav-pill:hover,
.nav-pill.active {
    opacity: 1;
    text-decoration: none;
}

.nav-pill.active { border-bottom-color: var(--accent); }

/* ═══════════════════════════════════════════
   TITLE
   ═══════════════════════════════════════════ */
.title-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 24px 4px;
    text-align: center;
}

.page-title {
    font-size: clamp(1.4rem, 3vw, 1.9rem);
    font-weight: 800;
    color: var(--text);
    margin-bottom: 10px;
    letter-spacing: -0.4px;
}

.page-subtitle {
    font-size: 0.9rem;
    color: var(--text-muted);
    max-width: 660px;
    margin: 0 auto;
    line-height: 1.55;
}

/* ═══════════════════════════════════════════
   STAT CARDS
   ═══════════════════════════════════════════ */
.cards-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px 24px 0;
}

.cards-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 18px;
    box-shadow: var(--shadow);
}

.card-label {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.card-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1.1;
    margin-bottom: 4px;
}

.card-sub {
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 3px;
    color: var(--text-muted);
}

.card-date {
    font-size: 0.72rem;
    color: var(--text-muted);
}

/* ═══════════════════════════════════════════
   CHART SECTIONS (Time Series, Climatology, Map)
   ═══════════════════════════════════════════ */
.chart-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 24px;
    width: 100%;
}

.chart-header { margin-bottom: 12px; }

.chart-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
}

.chart-desc {
    font-size: 0.83rem;
    color: var(--text-muted);
    font-style: italic;
}

/* ── Iframe (plots) ── */
.iframe-wrapper {
    width: 100%;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    background: #fff;
}

.iframe-wrapper iframe {
    width: 100%;
    height: 500px;
    border: none;
    display: block;
}

/* ── Map ── */
.map-wrapper {
    width: 100%;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

#map {
    width: 100%;
    height: 500px;
}

/* Leaflet controls */
.color-bar-container {
    background: rgba(255,255,255,0.92);
    padding: 8px 10px;
    border-radius: 6px;
    box-shadow: 0 1px 5px rgba(0,0,0,0.15);
    font-family: var(--font);
    font-size: 0.72rem;
}

.color-bar-title {
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
    white-space: nowrap;
}

.color-bar {
    width: 160px;
    height: 12px;
    background: linear-gradient(to right, #0000ff, #ffffff, #ff0000);
    border-radius: 3px;
    margin-bottom: 3px;
}

.color-bar-labels {
    display: flex;
    justify-content: space-between;
    color: var(--text-muted);
    font-size: 0.68rem;
}

.dropdown-container {
    background: rgba(255,255,255,0.92);
    padding: 6px 8px;
    border-radius: 6px;
    box-shadow: 0 1px 5px rgba(0,0,0,0.15);
    margin-top: 6px;
}

.dropdown-container select {
    font-family: var(--font);
    font-size: 0.8rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 3px 6px;
    color: var(--text);
    background: #fff;
    cursor: pointer;
}

.data-popup { font-family: var(--font); font-size: 0.82rem; }

/* ═══════════════════════════════════════════
   PROSE PAGES (About, Stories)
   ═══════════════════════════════════════════ */
.prose-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 48px 24px 64px;
    flex: 1;
    width: 100%;
}

.prose-body {
    max-width: 680px;
}

.prose-body h1 {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text);
    margin: 0 0 28px;
    letter-spacing: -0.4px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.prose-body h2 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text);
    margin: 36px 0 10px;
    padding-left: 10px;
    border-left: 3px solid var(--accent);
}

.prose-body h3 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text);
    margin: 24px 0 8px;
}

.prose-body p {
    font-size: 0.95rem;
    color: var(--text);
    line-height: 1.75;
    margin: 0 0 18px;
}

.prose-body a { color: var(--accent); }

.prose-body strong { font-weight: 700; }

.prose-body em { font-style: italic; }

.prose-body hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 40px 0;
}

.prose-body ul,
.prose-body ol {
    margin: 0 0 18px 0;
    padding-left: 1.6em;
}

.prose-body li {
    font-size: 0.95rem;
    color: var(--text);
    line-height: 1.75;
    margin-bottom: 6px;
}

.prose-body li + li { margin-top: 2px; }

.prose-body code {
    font-family: 'Courier New', monospace;
    font-size: 0.85em;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 1px 5px;
}

.prose-body blockquote {
    border-left: 3px solid var(--accent);
    margin: 20px 0;
    padding: 10px 18px;
    background: var(--bg-card);
    border-radius: 0 var(--radius) var(--radius) 0;
    color: var(--text-muted);
    font-style: italic;
}

.prose-body blockquote p { margin-bottom: 0; color: var(--text-muted); }

.stories-coming {
    color: var(--text-muted);
    font-style: italic;
    font-size: 0.95rem;
}

.prose-figure {
    margin: 32px 0 0;
}

.prose-figure img {
    width: 100%;
    max-width: 560px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    display: block;
}

.prose-figure figcaption {
    margin-top: 8px;
    font-size: 0.78rem;
    color: var(--text-muted);
    font-style: italic;
    max-width: 560px;
}

/* ═══════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════ */
.site-footer {
    border-top: 1px solid var(--border);
    padding: 20px 24px;
    text-align: center;
    margin-top: auto;
}

.footer-copy { font-size: 0.76rem; color: var(--text-muted); }
.footer-copy a { color: var(--text-muted); }
.footer-copy a:hover { color: var(--text); text-decoration: underline; }

/* ═══════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════ */
@media (max-width: 680px) {
    .top-bar-inner { padding: 0 16px; }

    .cards-row { grid-template-columns: 1fr 1fr; }
    .cards-row .stat-card:last-child { grid-column: 1 / -1; }

    .title-section,
    .cards-section  { padding-left: 16px; padding-right: 16px; }
    .chart-section  { padding: 24px 16px; }

    .iframe-wrapper iframe,
    #map { height: 380px; }

    .prose-section  { padding: 32px 16px 48px; }
    .prose-body h1  { font-size: 1.4rem; }
}

@media (max-width: 400px) {
    .cards-row { grid-template-columns: 1fr; }
    .cards-row .stat-card:last-child { grid-column: auto; }
}