:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #111118;
  --bg-card: #16161f;
  --bg-card-hover: #1e1e2a;
  --accent: #4fbdff;
  --accent-dim: #2d9de0;
  --accent-glow: rgba(79, 189, 255, 0.15);
  --green: #4ade80;
  --gold: #fbbf24;
  --text-primary: #f0f0f5;
  --text-secondary: #9898b0;
  --text-muted: #5a5a70;
  --border: rgba(255, 255, 255, 0.07);
  --border-accent: rgba(79, 189, 255, 0.3);
  --radius: 12px;
  --radius-sm: 8px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
}

/* ── NAV ── */
nav {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 2rem;
  height: 64px;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-brand {
  font-size: 1.2rem; font-weight: 700; letter-spacing: -0.02em;
  color: var(--text-primary); text-decoration: none;
  display: flex; align-items: center; gap: 0.5rem;
}
.nav-brand span { color: var(--accent); }

.nav-links {
  display: flex; align-items: center; gap: 0.25rem;
  list-style: none;
}
.nav-links a {
  color: var(--text-secondary); text-decoration: none;
  padding: 0.4rem 0.85rem; border-radius: var(--radius-sm);
  font-size: 0.875rem; font-weight: 500;
  transition: color 0.2s, background 0.2s;
}
.nav-user {
  display: flex; align-items: center; gap: 0.75rem; flex-shrink: 0;
}
.nav-user-name {
  font-size: 0.82rem; color: var(--text-secondary);
  white-space: nowrap; max-width: 180px;
  overflow: hidden; text-overflow: ellipsis;
  display: flex; align-items: center; gap: 0.5rem;
  text-decoration: none; transition: color 0.2s;
}
.nav-user-name:hover { color: var(--text-primary); }
.nav-avatar {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--accent); color: #0a0a0f;
  font-size: 0.75rem; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.nav-logout {
  font-size: 0.8rem; font-weight: 600;
  color: var(--text-muted); text-decoration: none;
  padding: 0.3rem 0.7rem; border: 1px solid var(--border);
  border-radius: var(--radius-sm); transition: all 0.2s;
  white-space: nowrap;
}
.nav-logout:hover { color: #f87171; border-color: rgba(248,113,113,0.4); background: rgba(248,113,113,0.06); }

.nav-links a:hover, .nav-links a.active {
  color: var(--text-primary); background: var(--accent-glow);
}
.nav-links a.active { color: var(--accent); }

/* ── LAYOUT ── */
.page-wrapper {
  max-width: 1100px;
  margin: 0 auto;
  padding: 100px 2rem 4rem;
}

/* ── HERO (index) ── */
.hero {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  text-align: center;
  padding: 0 2rem;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 60% 50% at 50% 30%, rgba(79, 189, 255,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner { position: relative; max-width: 820px; }

.hero-badge {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: var(--accent-glow); border: 1px solid var(--border-accent);
  color: var(--accent); border-radius: 100px;
  padding: 0.35rem 1rem; font-size: 0.8rem; font-weight: 600;
  letter-spacing: 0.04em; text-transform: uppercase;
  margin-bottom: 1.75rem;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 800; letter-spacing: -0.03em;
  line-height: 1.15; margin-bottom: 0.5rem;
}
.hero h1 em { font-style: normal; color: var(--accent); }

.hero-subtitle {
  font-size: 1.15rem; color: var(--text-secondary);
  margin: 1.25rem 0 2.5rem;
  max-width: 580px; margin-left: auto; margin-right: auto;
}

.hero-cta {
  display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap;
}

/* ── MATCH SCORE ── */
.match-ring {
  width: 160px; height: 160px;
  border-radius: 50%;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  background: conic-gradient(var(--accent) 0% 92%, var(--bg-card) 92% 100%);
  position: relative; margin: 2.5rem auto;
}
.match-ring::before {
  content: ""; position: absolute; inset: 14px;
  border-radius: 50%; background: var(--bg-primary);
}
.match-ring-inner {
  position: relative; z-index: 1; text-align: center;
}
.match-ring-pct {
  font-size: 2.2rem; font-weight: 800; color: var(--accent); line-height: 1;
}
.match-ring-label { font-size: 0.7rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.08em; }

/* ── BUTTONS ── */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.7rem 1.5rem; border-radius: var(--radius-sm);
  font-size: 0.9rem; font-weight: 600; text-decoration: none;
  transition: all 0.2s; cursor: pointer; border: none;
}
.btn-primary {
  background: var(--accent); color: #0a0a0f;
}
.btn-primary:hover { background: #7dd3ff; transform: translateY(-1px); }
.btn-outline {
  background: transparent; color: var(--text-primary);
  border: 1px solid var(--border-accent);
}
.btn-outline:hover { background: var(--accent-glow); }

/* ── SECTION HEADER ── */
.section-header { margin-bottom: 2.5rem; }
.section-tag {
  display: inline-block;
  background: var(--accent-glow); border: 1px solid var(--border-accent);
  color: var(--accent); border-radius: 100px;
  padding: 0.3rem 0.9rem; font-size: 0.75rem; font-weight: 600;
  letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 0.75rem;
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800; letter-spacing: -0.025em; line-height: 1.2;
}
.section-lead {
  color: var(--text-secondary); font-size: 1rem; margin-top: 0.6rem;
  max-width: 640px;
}

/* ── CARDS ── */
.card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.75rem;
  transition: border-color 0.2s, background 0.2s;
}
.card:hover { border-color: var(--border-accent); background: var(--bg-card-hover); }

.card-grid {
  display: grid; gap: 1.25rem;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}
.card-grid-2 { grid-template-columns: repeat(auto-fill, minmax(460px, 1fr)); }

.card-icon {
  width: 44px; height: 44px; border-radius: var(--radius-sm);
  background: var(--accent-glow); border: 1px solid var(--border-accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; margin-bottom: 1rem;
}
.card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 0.5rem; }
.card p, .card li { color: var(--text-secondary); font-size: 0.9rem; }
.card ul { padding-left: 1.1rem; }
.card li { margin-bottom: 0.3rem; }

/* ── MATCH ROWS ── */
.match-table { display: flex; flex-direction: column; gap: 1rem; }
.match-row {
  display: grid; grid-template-columns: 1fr auto 1fr;
  gap: 1rem; align-items: start;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.25rem 1.5rem;
  transition: border-color 0.2s;
}
.match-row:hover { border-color: var(--border-accent); }
.match-col-label {
  font-size: 0.7rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.07em; color: var(--text-muted); margin-bottom: 0.4rem;
}
.match-col h4 { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.3rem; }
.match-col p { color: var(--text-secondary); font-size: 0.85rem; line-height: 1.5; }
.match-col.them h4 { color: var(--gold); }
.match-col.you h4 { color: var(--green); }
.match-arrow {
  display: flex; align-items: center; justify-content: center;
  color: var(--accent); font-size: 1.1rem; padding-top: 1.1rem;
}

/* ── PILL / TAG ── */
.pill {
  display: inline-flex; align-items: center;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 100px; padding: 0.3rem 0.85rem;
  font-size: 0.8rem; color: var(--text-secondary); margin: 0.2rem;
}
.pill.green { border-color: rgba(74,222,128,0.3); color: var(--green); background: rgba(74,222,128,0.08); }
.pill.gold  { border-color: rgba(251,191,36,0.3);  color: var(--gold);  background: rgba(251,191,36,0.08); }
.pill.purple{ border-color: var(--border-accent);   color: var(--accent); background: var(--accent-glow); }

/* ── STAT ROW ── */
.stat-row {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem; margin: 2rem 0;
}
.stat-box {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.25rem 1.5rem; text-align: center;
}
.stat-num { font-size: 1.9rem; font-weight: 800; color: var(--accent); line-height: 1; }
.stat-desc { font-size: 0.8rem; color: var(--text-muted); margin-top: 0.25rem; text-transform: uppercase; letter-spacing: 0.05em; }

/* ── INTERVIEW GUIDE ── */
.interview-section { margin-bottom: 3rem; }
.interview-section h2 {
  font-size: 1.4rem; font-weight: 700; margin-bottom: 1.25rem;
  padding-bottom: 0.75rem; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 0.6rem;
}
.interview-section h2 .icon { font-size: 1.1rem; }

.q-block {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); margin-bottom: 1rem; overflow: hidden;
}
.q-header {
  display: flex; justify-content: space-between; align-items: flex-start;
  padding: 1.25rem 1.5rem; cursor: pointer; gap: 1rem;
  transition: background 0.2s;
}
.q-header:hover { background: var(--bg-card-hover); }
.q-header h4 { font-size: 0.95rem; font-weight: 600; flex: 1; }
.q-toggle {
  color: var(--accent); font-size: 1.1rem; flex-shrink: 0;
  transition: transform 0.2s;
}
.q-block.open .q-toggle { transform: rotate(45deg); }
.q-body {
  display: none; padding: 0 1.5rem 1.5rem;
  border-top: 1px solid var(--border);
}
.q-block.open .q-body { display: block; }

.answer-label {
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--accent); margin: 1rem 0 0.4rem;
}
.answer-text { color: var(--text-secondary); font-size: 0.88rem; line-height: 1.65; }
.star-tag {
  display: inline-block; padding: 0.15rem 0.6rem; border-radius: 4px;
  font-size: 0.72rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.06em; margin-right: 0.3rem;
  background: var(--accent-glow); color: var(--accent);
}
.star-tag.s { background: rgba(251,191,36,0.12); color: var(--gold); }
.star-tag.t { background: rgba(74,222,128,0.1); color: var(--green); }
.star-tag.a { background: rgba(59,130,246,0.12); color: #60a5fa; }
.star-tag.r { background: rgba(239,68,68,0.1); color: #f87171; }

/* ── CHECKLIST ── */
.checklist { list-style: none; display: flex; flex-direction: column; gap: 0.6rem; }
.checklist li {
  display: flex; align-items: flex-start; gap: 0.6rem;
  font-size: 0.9rem; color: var(--text-secondary);
}
.checklist li::before {
  content: "✓"; color: var(--green); font-weight: 700;
  flex-shrink: 0; margin-top: 0.05rem;
}

/* ── GAP SECTION ── */
.gap-box {
  background: rgba(251,191,36,0.06); border: 1px solid rgba(251,191,36,0.2);
  border-radius: var(--radius); padding: 1.5rem;
}
.gap-box h4 { color: var(--gold); font-weight: 700; margin-bottom: 0.5rem; }

/* ── ARCHITECTURE DOCUMENT ── */
.doc-header { margin-bottom: 3rem; }

.doc-meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
  margin: 1.5rem 0 2rem;
  padding: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.doc-meta-item { display: flex; flex-direction: column; gap: 0.2rem; }
.doc-meta-label {
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.07em; color: var(--text-muted);
}
.doc-meta-value { font-size: 0.88rem; color: var(--text-primary); font-weight: 500; }

.toc-box {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.25rem 1.5rem;
}
.toc-title {
  font-size: 0.75rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--text-muted); margin-bottom: 0.85rem;
}
.toc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.35rem;
}
.toc-link {
  font-size: 0.85rem; color: var(--text-secondary); text-decoration: none;
  padding: 0.2rem 0; transition: color 0.15s;
}
.toc-link:hover { color: var(--accent); }

/* Arch section */
.arch-section {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 1.5rem;
  margin-bottom: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}
.arch-section-num {
  font-size: 2.5rem; font-weight: 900;
  color: rgba(79, 189, 255,0.15); letter-spacing: -0.04em;
  line-height: 1; padding-top: 0.2rem;
  font-variant-numeric: tabular-nums;
}
.arch-section-body h2 {
  font-size: 1.4rem; font-weight: 800;
  letter-spacing: -0.02em; margin-bottom: 1rem;
}
.arch-section-body p { color: var(--text-secondary); font-size: 0.92rem; line-height: 1.7; }

/* Component block */
.component-block { margin-bottom: 1rem; }
.component-title {
  font-size: 1.1rem; font-weight: 700;
  margin-bottom: 1rem; color: var(--accent);
  display: flex; align-items: center; gap: 0.5rem;
}

/* Code block */
.code-block {
  background: #0d0d14; border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 1rem 1.25rem;
  font-family: "SF Mono", "Fira Code", monospace; font-size: 0.83rem;
  line-height: 1.65; overflow-x: auto;
}
.code-line { color: #4fbdff; }
.code-comment { color: #5a5a70; font-style: italic; }

/* Problem grid */
.problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem; margin-top: 1rem;
}
.problem-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.25rem;
  transition: border-color 0.2s;
}
.problem-card:hover { border-color: rgba(248,113,113,0.3); }
.problem-num {
  display: inline-block; width: 28px; height: 28px;
  border-radius: 50%; background: rgba(248,113,113,0.12);
  border: 1px solid rgba(248,113,113,0.3);
  text-align: center; line-height: 28px;
  font-size: 0.75rem; font-weight: 800; color: #f87171;
  margin-bottom: 0.6rem;
}
.problem-card h4 { font-size: 0.93rem; font-weight: 700; margin-bottom: 0.4rem; }
.problem-card p { color: var(--text-secondary); font-size: 0.85rem; line-height: 1.55; }
.problem-impact {
  margin-top: 0.75rem; font-size: 0.75rem; font-weight: 600;
  color: #f87171; letter-spacing: 0.03em;
}

/* Arch table */
.arch-table { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.arch-table-header {
  display: grid; grid-template-columns: 1.2fr 1fr 2fr 1.5fr;
  gap: 1rem; padding: 0.6rem 1.25rem;
  background: var(--bg-card); font-size: 0.72rem;
  font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-muted);
}
.arch-table-row {
  display: grid; grid-template-columns: 1.2fr 1fr 2fr 1.5fr;
  gap: 1rem; padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--border); align-items: center;
}
.arch-table-row:hover { background: var(--bg-card-hover); }

/* Roadmap */
.roadmap-timeline { display: flex; flex-direction: column; gap: 1.25rem; }
.roadmap-phase {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.25rem 1.5rem;
}
.phase-tag {
  display: inline-block; padding: 0.3rem 0.85rem;
  border-radius: 100px; border: 1px solid;
  font-size: 0.78rem; font-weight: 700;
  letter-spacing: 0.04em;
}

/* ADR blocks */
.adr-block {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); margin-bottom: 1.25rem;
  overflow: hidden;
}
.adr-header {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 1rem 1.5rem; border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.adr-header h4 { font-size: 0.95rem; font-weight: 700; flex: 1; min-width: 200px; }
.adr-id {
  font-size: 0.75rem; font-weight: 700; font-family: monospace;
  color: var(--accent); background: var(--accent-glow);
  padding: 0.2rem 0.5rem; border-radius: 4px;
}
.adr-status {
  font-size: 0.72rem; font-weight: 700; padding: 0.2rem 0.65rem;
  border-radius: 100px; text-transform: uppercase; letter-spacing: 0.05em;
}
.adr-status.accepted { background: rgba(74,222,128,0.1); color: var(--green); border: 1px solid rgba(74,222,128,0.3); }
.adr-status.proposed { background: rgba(251,191,36,0.1); color: var(--gold); border: 1px solid rgba(251,191,36,0.3); }
.adr-body { padding: 1.25rem 1.5rem; }
.adr-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }

@media (max-width: 640px) {
  .arch-section { grid-template-columns: 1fr; }
  .arch-section-num { font-size: 1.5rem; }
  .adr-grid { grid-template-columns: 1fr; }
  .arch-table-header, .arch-table-row { grid-template-columns: 1fr 1fr; }
  .toc-grid { grid-template-columns: 1fr; }
}

/* ── RESOURCE CARDS ── */
.resource-section { margin-bottom: 3.5rem; }
.resource-section-header { margin-bottom: 1.5rem; }

.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}
.resource-grid-3 { grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); }

.resource-card {
  display: flex; flex-direction: column;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.25rem 1.4rem;
  text-decoration: none; color: inherit;
  transition: border-color 0.2s, background 0.2s, transform 0.15s;
}
.resource-card:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}
.resource-card-top {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 0.75rem; gap: 0.5rem;
}
.resource-domain {
  font-size: 0.72rem; color: var(--text-muted);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.resource-card h4 {
  font-size: 0.93rem; font-weight: 700; margin-bottom: 0.5rem;
  color: var(--text-primary); line-height: 1.35;
}
.resource-card p {
  font-size: 0.83rem; color: var(--text-secondary);
  line-height: 1.55; flex: 1;
}
.resource-link-arrow {
  display: inline-block; margin-top: 1rem;
  font-size: 0.8rem; font-weight: 600; color: var(--accent);
}

/* ── DIAGRAM WRAP ── */
.diagram-wrap {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: #111118;
}
.diagram-wrap img { display: block; width: 100%; }

/* ── FOOTER ── */
footer {
  text-align: center; padding: 2rem;
  color: var(--text-muted); font-size: 0.8rem;
  border-top: 1px solid var(--border);
  margin-top: 4rem;
}

/* ── RESPONSIVE ── */
@media (max-width: 640px) {
  .match-row { grid-template-columns: 1fr; }
  .match-arrow { display: none; }
  .card-grid-2 { grid-template-columns: 1fr; }
  nav { padding: 0 1rem; }
  .nav-links a { padding: 0.35rem 0.55rem; font-size: 0.8rem; }
  .page-wrapper { padding: 90px 1rem 3rem; }
}