/* ── Reset & base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --black:   #111111;
  --gray-1:  #333333;
  --gray-2:  #666666;
  --gray-3:  #999999;
  --gray-4:  #cccccc;
  --gray-5:  #eeeeee;
  --white:   #ffffff;
  --accent:  #1a56a0;
  --accent-light: #e8f0fb;
  --border:  #e0e0e0;
  --radius:  6px;
  --font:    'Georgia', serif;
  --sans:    system-ui, -apple-system, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  font-size: 15px;
  color: var(--black);
  background: var(--white);
  line-height: 1.6;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Nav ── */
nav {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--white);
  z-index: 10;
}

.nav-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font);
  font-size: 18px;
  color: var(--black);
  font-weight: normal;
  letter-spacing: -0.3px;
}

.nav-links { display: flex; gap: 24px; }
.nav-links a { font-size: 14px; color: var(--gray-2); }
.nav-links a:hover { color: var(--black); text-decoration: none; }

/* ── Hero ── */
.hero {
  max-width: 900px;
  margin: 0 auto;
  padding: 60px 24px 52px;
  border-bottom: 1px solid var(--border);
}

.eyebrow {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 16px;
}

.hero h1 {
  font-family: var(--font);
  font-size: 32px;
  font-weight: normal;
  line-height: 1.25;
  color: var(--black);
  max-width: 620px;
  margin-bottom: 16px;
}

.hero-sub {
  font-size: 15px;
  color: var(--gray-2);
  max-width: 560px;
  margin-bottom: 32px;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-bottom: 32px;
}

.stat { display: flex; flex-direction: column; gap: 2px; }
.stat .num { font-size: 22px; font-weight: 600; color: var(--black); }
.stat .label { font-size: 12px; color: var(--gray-3); }

.divider-v {
  width: 1px;
  height: 32px;
  background: var(--border);
}

.hero-btns { display: flex; gap: 10px; flex-wrap: wrap; }

/* ── Buttons ── */
.btn-primary {
  display: inline-block;
  background: var(--accent);
  color: var(--white);
  padding: 9px 20px;
  border-radius: var(--radius);
  font-size: 14px;
  border: none;
  cursor: pointer;
}
.btn-primary:hover { background: #154a8e; text-decoration: none; color: var(--white); }

.btn-ghost {
  display: inline-block;
  background: transparent;
  color: var(--black);
  padding: 9px 20px;
  border-radius: var(--radius);
  font-size: 14px;
  border: 1px solid var(--border);
}
.btn-ghost:hover { border-color: var(--gray-3); text-decoration: none; }

/* ── Sections ── */
.section {
  max-width: 900px;
  margin: 0 auto;
  padding: 52px 24px;
  border-bottom: 1px solid var(--border);
}

.section.alt { background: #fafafa; max-width: 100%; }
.section.alt > * { max-width: 900px; margin-left: auto; margin-right: auto; }
.section.alt h2, .section.alt .section-sub { max-width: 900px; margin-left: auto; margin-right: auto; }

.section h2 {
  font-family: var(--font);
  font-size: 24px;
  font-weight: normal;
  margin-bottom: 8px;
}

.section-sub {
  font-size: 14px;
  color: var(--gray-2);
  margin-bottom: 28px;
}

/* ── Dataset grid ── */
.ds-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}

.ds-card {
  display: block;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  color: var(--black);
  text-decoration: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.ds-card:hover {
  border-color: var(--accent);
  box-shadow: 0 2px 8px rgba(26,86,160,0.08);
  text-decoration: none;
}

.ds-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  gap: 8px;
}

.ds-name { font-size: 14px; font-weight: 600; }

.ds-badge {
  font-size: 10px;
  padding: 2px 7px;
  border-radius: 20px;
  white-space: nowrap;
}
.ds-badge.india  { background: #fff3e0; color: #c66000; }
.ds-badge.world  { background: var(--accent-light); color: var(--accent); }
.ds-badge.ancient { background: #f3e8ff; color: #6b21a8; }

.ds-desc { font-size: 13px; color: var(--gray-2); margin-bottom: 12px; line-height: 1.5; }

.ds-meta {
  display: flex;
  gap: 10px;
  font-size: 11px;
  color: var(--gray-3);
  border-top: 1px solid var(--gray-5);
  padding-top: 10px;
}

/* ── Sample tabs ── */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.tab {
  font-size: 13px;
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--white);
  color: var(--gray-2);
  cursor: pointer;
  transition: all 0.12s;
}
.tab:hover { border-color: var(--accent); color: var(--accent); }
.tab.active { background: var(--accent); color: var(--white); border-color: var(--accent); }

.tab-content { display: none; max-width: 900px; margin: 0 auto; }
.tab-content.active { display: block; }

/* ── Table ── */
.table-wrap {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  min-width: 600px;
}

thead { background: var(--gray-5); }

th {
  padding: 10px 14px;
  text-align: left;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--gray-2);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--gray-5);
  color: var(--gray-1);
}

tbody tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: #f7f9fc; }

.table-note {
  font-size: 13px;
  color: var(--gray-2);
  margin-top: 12px;
}

/* Inline coin images in tables */
td img {
  width: 100px;
  height: 52px;
  object-fit: cover;
  border-radius: 4px;
  border: 1px solid var(--border);
  display: block;
}

/* Highlight sold price */
td.sold {
  color: #1a7a3a;
  font-weight: 600;
}

/* Samples section inner container */
.samples-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Placeholder ── */
.placeholder-msg {
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 48px 24px;
  text-align: center;
  color: var(--gray-2);
}
.placeholder-msg p { margin-bottom: 16px; }

/* ── Contact form ── */
.contact-form { max-width: 560px; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 0;
}

.form-group { display: flex; flex-direction: column; gap: 5px; margin-bottom: 14px; }

label { font-size: 13px; color: var(--gray-1); font-weight: 500; }

input, select, textarea {
  font-family: var(--sans);
  font-size: 14px;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--black);
  background: var(--white);
  width: 100%;
  outline: none;
  transition: border-color 0.12s;
}
input:focus, select:focus, textarea:focus { border-color: var(--accent); }

textarea { resize: vertical; min-height: 110px; }

/* ── Footer ── */
footer {
  border-top: 1px solid var(--border);
  padding: 28px 24px;
  text-align: center;
  font-size: 13px;
  color: var(--gray-3);
  line-height: 1.8;
}

footer strong { color: var(--black); }

/* ── Responsive ── */
@media (max-width: 600px) {
  .hero h1 { font-size: 24px; }
  .hero-stats { gap: 16px; }
  .form-row { grid-template-columns: 1fr; }
  .ds-grid { grid-template-columns: 1fr; }
  .nav-links { gap: 14px; }
}