/* prepstack-public-preview v1.0.0 */
:root {
  color-scheme: dark;
  --page: #0b1020;
  --surface: #141b2e;
  --surface-soft: #19233a;
  --line: rgba(255, 255, 255, 0.13);
  --ink: #f4f6fb;
  --muted: #aab3c8;
  --cyan: #76e4f7;
  --violet: #b7a6ff;
  --green: #7ce2ac;
  --gold: #ffd084;
  --danger: #ff9ba7;
  --radius: 1.15rem;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 0, rgba(84, 220, 255, 0.13), transparent 30rem),
    radial-gradient(circle at 90% 0, rgba(152, 119, 255, 0.15), transparent 28rem),
    var(--page);
  font: 16px/1.5 ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a { color: var(--cyan); text-underline-offset: 0.22em; }
a:hover { text-decoration-thickness: 0.13em; }
button, input, select { font: inherit; }

.skip-link {
  position: fixed;
  z-index: 20;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.65rem 0.85rem;
  color: #07131a;
  background: var(--cyan);
  border-radius: 0.7rem;
  transform: translateY(-180%);
}
.skip-link:focus { transform: translateY(0); }

.site-nav {
  position: sticky;
  z-index: 10;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.25rem;
  padding: 0.65rem max(1.1rem, calc((100vw - 70rem) / 2));
  border-bottom: 1px solid var(--line);
  background: rgba(11, 16, 32, 0.9);
  backdrop-filter: blur(18px);
}

.site-brand {
  display: flex;
  flex-direction: column;
  color: var(--ink);
  text-decoration: none;
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.025em;
}
.site-brand small {
  margin-top: 0.22rem;
  color: var(--violet);
  font-size: 0.72rem;
  font-weight: 720;
  letter-spacing: 0.02em;
}

.site-links { display: flex; flex-wrap: wrap; align-items: center; gap: 0.55rem 1rem; }
.site-links a { color: var(--muted); text-decoration: none; font-size: 0.9rem; font-weight: 650; }
.site-links a:hover, .site-links a[aria-current="page"] { color: var(--ink); }
.site-links .pro-link { color: #16101f; background: var(--violet); padding: 0.5rem 0.8rem; border-radius: 999px; }

.page-shell { width: min(70rem, calc(100% - 2.2rem)); margin: 0 auto; padding: 3.5rem 0 4rem; }
.hero { max-width: 52rem; margin-bottom: 2.2rem; }
.kicker { margin: 0 0 0.65rem; color: var(--cyan); font-size: 0.76rem; font-weight: 800; letter-spacing: 0.14em; text-transform: uppercase; }
h1, h2, h3 { text-wrap: balance; }
h1 { margin: 0; font-size: clamp(2.45rem, 7vw, 5.4rem); line-height: 0.98; letter-spacing: -0.055em; }
h2 { margin: 2.7rem 0 1rem; font-size: clamp(1.55rem, 3vw, 2.25rem); line-height: 1.12; letter-spacing: -0.035em; }
h3 { margin: 0; font-size: 1.12rem; line-height: 1.25; letter-spacing: -0.018em; }
.lede { max-width: 46rem; margin: 1.15rem 0 0; color: var(--muted); font-size: clamp(1rem, 2vw, 1.18rem); }

.notice {
  margin: 1.4rem 0;
  padding: 1rem 1.1rem;
  border: 1px solid rgba(255, 208, 132, 0.35);
  border-radius: 0.9rem;
  color: #ffe5ba;
  background: rgba(128, 78, 15, 0.2);
}
.notice strong { color: #fff0d2; }

.stats, .feature-grid, .family-grid, .pattern-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
}
.stats { margin: 1.8rem 0 0; }
.stat, .feature-card, .family-card, .pattern-card, .catalog-item, .candidate-card, .pro-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.055);
}
.stat { padding: 1.15rem; }
.stat strong { display: block; font-size: 1.55rem; letter-spacing: -0.035em; }
.stat span { color: var(--muted); font-size: 0.86rem; }

.feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.feature-card, .family-card, .pattern-card { padding: 1.2rem; }
.feature-card p, .family-card p, .pattern-card p { margin: 0.55rem 0 0; color: var(--muted); }
.feature-card .actions, .family-card .actions, .pattern-card .actions { margin-top: 1rem; }

.family-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.family-card { position: relative; min-height: 9.5rem; }
.family-card.is-locked { opacity: 0.78; }

.membership {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  margin-bottom: 0.72rem;
  padding: 0.27rem 0.58rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.045em;
  text-transform: uppercase;
}
.membership.free { color: #062815; background: var(--green); }
.membership.pro { color: #1c1230; background: var(--violet); }
.membership.candidate { color: #2d1b00; background: var(--gold); }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.62rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink);
  background: var(--surface-soft);
  text-decoration: none;
  font-weight: 720;
}
.button.primary { color: #07131a; border-color: transparent; background: var(--cyan); }
.button.pro { color: #171020; border-color: transparent; background: var(--violet); }

.catalog-controls {
  position: relative;
  display: grid;
  grid-template-columns: minmax(15rem, 2fr) repeat(3, minmax(8rem, 0.65fr));
  gap: 0.8rem;
  margin: 1.5rem 0 1rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(9, 14, 28, 0.8);
}
.control { display: grid; gap: 0.38rem; color: var(--muted); font-size: 0.78rem; font-weight: 700; }
.control input, .control select {
  width: 100%;
  min-height: 2.65rem;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 0.7rem;
  color: var(--ink);
  background: var(--surface);
}
.control input:focus, .control select:focus { outline: 2px solid var(--cyan); outline-offset: 2px; }
.search-control { position: relative; }
.suggestions {
  position: absolute;
  z-index: 6;
  top: calc(100% + 0.25rem);
  right: 0;
  left: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  background: #111a2c;
  box-shadow: 0 1.1rem 2.5rem rgba(0, 0, 0, 0.4);
}
.suggestions button { display: block; width: 100%; padding: 0.72rem; border: 0; border-bottom: 1px solid var(--line); color: var(--ink); background: transparent; text-align: left; }
.suggestions button:hover, .suggestions button:focus { background: var(--surface-soft); }

.catalog-status { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin: 0.9rem 0; color: var(--muted); }
.catalog-grid { display: grid; gap: 0.65rem; }
.catalog-item { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 1rem; padding: 1rem; }
.catalog-item-main { min-width: 0; }
.catalog-item-title { display: inline; color: var(--ink); font-size: 1rem; font-weight: 760; text-decoration: none; }
.catalog-item-title:hover { color: var(--cyan); }
.catalog-meta { margin: 0.32rem 0 0; color: var(--muted); font-size: 0.84rem; overflow-wrap: anywhere; }
.catalog-teaser { margin: 0.5rem 0 0; color: #d6dcef; font-size: 0.9rem; }
.catalog-item-side { display: flex; flex-direction: column; align-items: flex-end; justify-content: center; gap: 0.45rem; }
.catalog-item-side small { color: var(--muted); text-align: right; }

.pagination { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 0.55rem; margin-top: 1.2rem; }
.pagination button { min-height: 2.5rem; padding: 0.45rem 0.8rem; border: 1px solid var(--line); border-radius: 0.65rem; color: var(--ink); background: var(--surface); }
.pagination button:disabled { opacity: 0.38; }
.pagination span { color: var(--muted); }

.pattern-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.pattern-card dl { margin: 0.9rem 0 0; }
.pattern-card dt { margin-top: 0.7rem; color: var(--cyan); font-size: 0.74rem; font-weight: 800; letter-spacing: 0.07em; text-transform: uppercase; }
.pattern-card dd { margin: 0.2rem 0 0; color: var(--muted); }
.pattern-card pre { overflow: auto; max-height: 18rem; padding: 0.9rem; border-radius: 0.75rem; background: #070b14; font-size: 0.83rem; }

.graph-board { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0.8rem; margin: 1.4rem 0; }
.graph-node { min-height: 8rem; padding: 1rem; border: 1px solid rgba(118, 228, 247, 0.35); border-radius: 1rem; background: rgba(118, 228, 247, 0.075); }
.graph-node span { display: block; margin-top: 0.5rem; color: var(--muted); font-size: 0.82rem; }
.edge-list { display: flex; flex-wrap: wrap; gap: 0.55rem; padding: 0; list-style: none; }
.edge-list li { padding: 0.5rem 0.7rem; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); background: var(--surface); font-size: 0.82rem; }

.problem-header { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 1rem; align-items: start; }
.problem-id { color: var(--cyan); font-size: 0.95rem; font-weight: 800; letter-spacing: 0.08em; }
.tag-list { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.8rem; }
.tag-list span { padding: 0.3rem 0.55rem; border-radius: 999px; color: var(--muted); background: var(--surface-soft); font-size: 0.78rem; }
.candidate-list { display: grid; gap: 0.75rem; }
.candidate-card { padding: 1.05rem; }
.candidate-card header { display: flex; align-items: flex-start; justify-content: space-between; gap: 0.8rem; }
.candidate-card p { margin: 0.6rem 0 0; color: var(--muted); }
.candidate-card .actions { margin-top: 0.8rem; }

.pro-panel { max-width: 46rem; padding: clamp(1.25rem, 4vw, 2.2rem); }
.pro-panel h1 { font-size: clamp(2.25rem, 6vw, 4.8rem); }
.pro-panel .product-subtitle { margin: 0.75rem 0 1.3rem; color: var(--violet); font-size: 1.35rem; font-weight: 750; }

.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.page-footer { margin-top: 3.5rem; padding-top: 1.25rem; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.84rem; }

@media (max-width: 850px) {
  .stats, .family-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .catalog-controls { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .search-control { grid-column: 1 / -1; }
  .graph-board { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  .site-nav { position: static; align-items: flex-start; }
  .site-links { justify-content: flex-end; }
  .site-links a:not(.pro-link) { display: none; }
  .page-shell { width: min(100% - 1.25rem, 70rem); padding-top: 2.25rem; }
  .stats, .feature-grid, .family-grid, .pattern-grid, .graph-board { grid-template-columns: 1fr; }
  .catalog-controls { grid-template-columns: 1fr; }
  .search-control { grid-column: auto; }
  .catalog-item { grid-template-columns: 1fr; }
  .catalog-item-side { align-items: flex-start; }
  .catalog-item-side small { text-align: left; }
  .problem-header { grid-template-columns: 1fr; }
}