/* WRSVM landing page */

:root {
  /* Figure palette: NAVY / BLUE / PINK / CREAM / PLUM / BLUSH */
  --bg:          #FBF5F8;  /* warm blush-cream page background */
  --bg-alt:      #FFFFFF;  /* cards */
  --ink:         #213C51;  /* NAVY — primary text and headings */
  --ink-soft:    #8B5A7D;  /* PLUM — muted text */
  --accent:      #4A2D45;  /* EGGPLANT — primary actions, links */
  --accent-deep: #2A1A28;  /* deeper eggplant — accent hover */
  --accent-soft: #F7DBF0;  /* BLUSH — hero gradient, table head */
  --pink:        #DDAED3;  /* PINK — secondary accent */
  --border:      #E9D5E1;  /* soft pink-grey */
  --code-bg:     #EEEEEE;  /* CREAM */
  --code-ink:    #213C51;  /* NAVY */
  --shadow:      0 1px 3px rgba(33,60,81,0.06);
  --radius:      8px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Hero ---------- */

.hero {
  background: linear-gradient(180deg, #ffffff 0%, var(--accent-soft) 100%);
  border-bottom: 1px solid var(--border);
  padding: 80px 0 64px;
  text-align: center;
}

.hero h1 {
  font-size: 4rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin: 0 0 16px;
  color: var(--accent);
  font-family: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
}

.tagline {
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 640px;
  margin: 0 auto 32px;
}

.hero-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 10px 22px;
  border-radius: var(--radius);
  font-weight: 500;
  text-decoration: none;
  font-size: 0.95rem;
  transition: transform 0.1s ease, box-shadow 0.15s ease;
}

.btn.primary {
  background: var(--accent);
  color: #fff;
}

.btn.primary:hover {
  background: var(--accent-deep);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(74,45,69,0.28);
}

.btn.ghost {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}

.btn.ghost:hover {
  background: var(--accent-soft);
}

.badges {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}

.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 12px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--ink-soft);
  font-family: "SF Mono", Menlo, Consolas, monospace;
}

/* ---------- Sections ---------- */

.section {
  padding: 56px 0;
  border-bottom: 1px solid var(--border);
}

h2 {
  font-size: 1.8rem;
  font-weight: 600;
  margin: 0 0 20px;
  color: var(--ink);
  font-family: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
}

h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 0 0 12px;
  color: var(--ink-soft);
}

h4 {
  font-size: 1rem;
  font-weight: 600;
  margin: 24px 0 10px;
  color: var(--ink);
}

p {
  color: var(--ink);
}

/* ---------- 3-column grid ---------- */

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 24px;
}

@media (max-width: 720px) {
  .grid-3 { grid-template-columns: 1fr; }
}

.card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}

.card h3 { margin-top: 0; }
.card p  { margin: 0; color: var(--ink-soft); font-size: 0.95rem; }

/* Download cards */

.dl-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-decoration: none;
  color: var(--ink);
  display: block;
  transition: transform 0.1s ease, box-shadow 0.15s ease, border-color 0.15s ease;
  box-shadow: var(--shadow);
}

.dl-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: 0 4px 14px rgba(139,90,125,0.15);
}

.dl-card h3 { margin: 0 0 6px; }
.dl-card p  { margin: 0 0 12px; color: var(--ink-soft); font-size: 0.95rem; }
.dl-meta {
  font-size: 0.8rem;
  color: var(--ink-soft);
  font-family: "SF Mono", Menlo, Consolas, monospace;
  background: var(--code-bg);
  padding: 2px 8px;
  border-radius: 4px;
}

/* ---------- Tabs ---------- */

.tabs {
  display: flex;
  gap: 4px;
  margin: 24px 0 0;
  border-bottom: 2px solid var(--border);
}

.tab {
  background: transparent;
  border: none;
  padding: 12px 20px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink-soft);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: color 0.15s ease, border-color 0.15s ease;
  font-family: inherit;
}

.tab:hover { color: var(--ink); }

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

.tab-panel {
  display: none;
  padding-top: 28px;
}

.tab-panel.active { display: block; }

/* ---------- Code ---------- */

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.55;
  margin: 12px 0;
}

code {
  font-family: "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  color: var(--code-ink);
}

p code, td code, li code {
  background: var(--code-bg);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.88em;
}

pre code {
  background: transparent;
  padding: 0;
  font-size: inherit;
}

/* ---------- Tables ---------- */

.table-wrap {
  overflow-x: auto;
  margin-top: 16px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  background: var(--bg-alt);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}

thead {
  background: var(--accent-soft);
}

th, td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  font-weight: 600;
  color: var(--accent);
  font-size: 0.88rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

tbody tr:last-child td { border-bottom: none; }

tbody tr:hover { background: var(--bg); }

/* ---------- Links ---------- */

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease;
}

a:hover {
  border-bottom-color: var(--accent);
}

.link {
  display: inline-block;
  margin-top: 12px;
  font-size: 0.92rem;
  font-weight: 500;
}

/* ---------- Footer ---------- */

.footer {
  padding: 32px 0;
  text-align: center;
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
}

.footer p {
  margin: 4px 0;
  font-size: 0.88rem;
  color: var(--ink-soft);
}

/* ---------- Top navigation (book-style) ---------- */

.topnav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(251, 245, 248, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}

.topnav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
}

.topnav .brand {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
  text-decoration: none;
  font-family: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  letter-spacing: 0.02em;
  border-bottom: none;
}

.topnav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 18px;
}

.topnav a {
  color: var(--ink-soft);
  font-size: 0.96rem;
  font-weight: 500;
  text-decoration: none;
  padding: 4px 2px;
  border-bottom: 2px solid transparent;
}

.topnav a:hover {
  color: var(--accent);
  border-bottom-color: transparent;
}

.topnav a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ---------- Tutorial-page layout ---------- */

.page-header {
  padding: 60px 0 28px;
  text-align: center;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #ffffff 0%, var(--accent-soft) 100%);
}

.page-header h1 {
  font-size: 2.8rem;
  color: var(--ink);
  margin: 0 0 10px;
  font-family: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  letter-spacing: -0.02em;
}

.page-header .tagline {
  margin: 0 auto;
  max-width: 640px;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.toc {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 22px;
  margin: 28px 0;
}

.toc h3 {
  margin: 0 0 10px;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
}

.toc ol {
  margin: 0;
  padding-left: 22px;
  color: var(--ink);
}

.toc li {
  margin: 4px 0;
}

.toc a {
  color: var(--ink);
}

.toc a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.output {
  background: #F4E4EE;
  border-left: 4px solid var(--pink);
  padding: 12px 16px;
  margin: 4px 0 18px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.88rem;
  white-space: pre-wrap;
  color: var(--ink);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.output::before {
  content: "output ";
  font-family: inherit;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  display: block;
  margin-bottom: 4px;
}

.pager {
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  gap: 16px;
  margin: 48px 0 12px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.pager a {
  flex: 1;
  padding: 16px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-alt);
  text-decoration: none;
  color: var(--ink);
  box-shadow: var(--shadow);
  transition: transform 0.1s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.pager a:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
  box-shadow: 0 4px 14px rgba(74,45,69,0.14);
}

.pager a.prev {
  text-align: left;
}

.pager a.next {
  text-align: right;
}

.pager .label {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  margin-bottom: 4px;
}

.pager .title {
  font-weight: 600;
  font-size: 1rem;
  color: var(--ink);
}

/* ---------- Responsive ---------- */

@media (max-width: 600px) {
  .hero h1   { font-size: 2.6rem; }
  .tagline   { font-size: 1rem; }
  .section   { padding: 40px 0; }
  h2         { font-size: 1.5rem; }
  pre        { font-size: 0.82rem; padding: 12px; }
  .topnav .container { flex-direction: column; gap: 10px; padding: 12px 16px; }
  .topnav ul { gap: 14px; flex-wrap: wrap; justify-content: center; }
  .pager { flex-direction: column; }
}