/* XChart Site — style.css */

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

:root {
  --bg: #f8f9fb;
  --surface: #ffffff;
  --surface-alt: #f0f2f5;
  --border: #e2e5ea;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --text: #111827;
  --text-muted: #6b7280;
  --radius: 10px;
  --sidebar-width: 210px;
  --header-height: 64px;
  --shadow: 0 2px 8px rgba(0,0,0,.08);
  --shadow-hover: 0 6px 20px rgba(0,0,0,.14);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

/* ── Header ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  height: var(--header-height);
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.header-title {
  display: flex;
  align-items: center;
  gap: .75rem;
}

.logo {
  font-size: 1.6rem;
  line-height: 1;
}

.header-title h1 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -.3px;
}

.tagline {
  font-size: .8rem;
  color: var(--text-muted);
  margin-top: 1px;
}

.header-links {
  display: flex;
  gap: 1rem;
}

.header-links a {
  font-size: .875rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  transition: color .15s;
}

.header-links a:hover {
  color: var(--accent);
}

/* ── Layout ── */
.layout {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  min-height: calc(100vh - var(--header-height) - 56px);
}

/* ── Sidebar ── */
.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  position: sticky;
  top: var(--header-height);
  height: calc(100vh - var(--header-height));
  overflow-y: auto;
  padding: 1.25rem 1rem;
  border-right: 1px solid var(--border);
  background: var(--surface);
}

.sidebar-header {
  margin-bottom: 1rem;
}

#search {
  width: 100%;
  padding: .5rem .75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: .875rem;
  background: var(--surface-alt);
  color: var(--text);
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}

#search:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37,99,235,.15);
}

.category-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.cat-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .45rem .75rem;
  border-radius: 7px;
  font-size: .875rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  transition: background .12s, color .12s;
}

.cat-link:hover {
  background: var(--surface-alt);
  color: var(--text);
}

.cat-link.active {
  background: #eff6ff;
  color: var(--accent);
}

.badge {
  font-size: .72rem;
  font-weight: 600;
  background: var(--surface-alt);
  color: var(--text-muted);
  padding: .1rem .45rem;
  border-radius: 999px;
}

.cat-link.active .badge {
  background: #dbeafe;
  color: var(--accent);
}

/* ── Content ── */
.content {
  flex: 1;
  padding: 1.5rem;
  min-width: 0;
}

.charts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
}

/* ── Chart Card ── */
.chart-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: box-shadow .2s, transform .2s;
}

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

.chart-card.hidden {
  display: none;
}

.chart-img-wrap {
  background: var(--surface-alt);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.chart-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.chart-info {
  padding: .75rem 1rem;
  display: flex;
  flex-direction: column;
  gap: .25rem;
}

.chart-category {
  font-size: .72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--accent);
}

.chart-name {
  font-size: .875rem;
  font-weight: 500;
  color: var(--text);
}

/* ── No results ── */
.no-results {
  grid-column: 1 / -1;
  text-align: center;
  padding: 4rem 1rem;
  color: var(--text-muted);
  font-size: .95rem;
}

/* ── GitHub link (fixes page) ── */
.gh-link {
  display: inline-block;
  margin-top: .25rem;
  font-size: .78rem;
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
  transition: color .15s;
}

.gh-link:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* ── No-image placeholder (fixes page) ── */
.chart-no-image {
  background: var(--surface-alt);
  border-bottom: 1px solid var(--border);
}

.no-image-label {
  font-size: .8rem;
  color: var(--text-muted);
}

/* ── Active header nav link ── */
.header-links a.active {
  color: var(--accent);
}

/* ── Footer ── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1rem 1.5rem;
  text-align: center;
  font-size: .8rem;
  color: var(--text-muted);
  background: var(--surface);
}

.site-footer a {
  color: var(--accent);
  text-decoration: none;
}

/* ── Scrollbar ── */
.sidebar::-webkit-scrollbar {
  width: 4px;
}
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }