/* ============================================================
   Quack — Site Styles
   ============================================================ */

:root {
  /* palette */
  --bg:          #0e1117;
  --bg-subtle:   #161b22;
  --bg-card:     #1c2129;
  --border:      #2d333b;
  --text:        #e6edf3;
  --text-muted:  #8b949e;
  --accent:      #f0a500;
  --accent-dim:  #b37b00;
  --green:       #3fb950;
  --red:         #f85149;
  --blue:        #58a6ff;
  --purple:      #bc8cff;

  /* type */
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* layout */
  --max-w: 960px;
  --nav-h: 56px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

/* ---- nav ---- */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: rgba(14, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text);
  font-weight: 600;
  font-size: 1.1rem;
}

.nav-logo:hover { text-decoration: none; }

.nav-logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--accent);
  color: var(--bg);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  border-radius: 6px;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  font-size: 0.9rem;
}

.nav-links a { color: var(--text-muted); }
.nav-links a:hover { color: var(--text); text-decoration: none; }

.nav-gh {
  padding: 0.3rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 6px;
}

.nav-gh:hover {
  border-color: var(--text-muted);
}

/* ---- layout ---- */
main {
  margin-top: var(--nav-h);
}

section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 4rem 1.5rem;
}

/* ---- hero ---- */
.hero {
  padding-top: 6rem;
  padding-bottom: 4rem;
  text-align: center;
}

.hero-logo {
  margin-bottom: 1.5rem;
}

.hero-mascot {
  width: 120px;
  height: auto;
  border-radius: 16px;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 1rem;
}

.hero h1 .accent { color: var(--accent); }

.hero .tagline {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 2rem;
  line-height: 1.5;
}

.hero-badges {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.badge {
  display: inline-block;
  padding: 0.3rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  background: var(--bg-subtle);
}

.badge--accent {
  border-color: var(--accent-dim);
  color: var(--accent);
}

.hero-code-note {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.4rem;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: 8px;
  transition: all 0.15s ease;
}

.btn:hover { text-decoration: none; }

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

.btn-primary:hover {
  background: var(--accent-dim);
}

.btn-secondary {
  background: var(--bg-subtle);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--text-muted);
}

/* ---- code blocks ---- */
.hero-code {
  max-width: 620px;
  margin: 0 auto;
  text-align: left;
}

pre {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.7;
}

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
}

.code-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: 6px 6px 0 0;
  padding: 0.25rem 0.75rem;
  margin-bottom: -1px;
  position: relative;
  z-index: 1;
}

.code-label + pre {
  border-top-left-radius: 0;
}

/* inline code */
p code, li code, td code {
  background: var(--bg-card);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.85em;
  border: 1px solid var(--border);
}

/* ---- status banner ---- */
.status-banner {
  text-align: center;
  padding: 0.8rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-subtle);
}

.status-banner strong { color: var(--accent); }

/* ---- side-by-side comparisons ---- */
.sbs {
  margin-bottom: 3rem;
}

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

.sbs-header h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.sbs-header p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
  max-width: 700px;
}

.sbs-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  align-items: start;
}

.sbs-triple {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1rem;
  align-items: start;
}

@media (max-width: 960px) {
  .sbs-triple { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .sbs-pair { grid-template-columns: 1fr; }
}

.sbs-block pre {
  margin: 0;
  font-size: 0.8rem;
  line-height: 1.65;
}

/* Rust syntax highlighting */
.rust .kw       { color: #ff7b72; }
.rust .type     { color: #79c0ff; }
.rust .func     { color: #d2a8ff; }
.rust .str      { color: #a5d6ff; }
.rust .num      { color: #79c0ff; }
.rust .comment  { color: #8b949e; font-style: italic; }
.rust .op       { color: #e6edf3; }
.rust .lifetime { color: #ffa657; }
.rust .field    { color: #e6edf3; }
.rust .enum-v   { color: #7ee787; }

.section-head {
  text-align: center;
  margin-bottom: 1rem;
}

.section-head h2 {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.section-head p {
  color: var(--text-muted);
  font-size: 1rem;
  margin-top: 0.5rem;
}

/* ---- comparison table ---- */
.table-wrap {
  overflow-x: auto;
  margin-top: 2rem;
  border: 1px solid var(--border);
  border-radius: 10px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

thead {
  background: var(--bg-card);
}

th, td {
  padding: 0.6rem 0.75rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

th {
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

th.col-quack {
  color: var(--accent);
}

td:first-child {
  text-align: left;
  color: var(--text-muted);
  font-weight: 500;
  white-space: nowrap;
}

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

/* highlight Quack column */
.cmp-table td.q-cell {
  background: rgba(240, 165, 0, 0.05);
}

/* icon cells */
.cmp-yes, .cmp-no, .cmp-half, .cmp-na {
  cursor: help;
  font-size: 1rem;
  font-weight: 700;
}

.cmp-yes  { color: var(--green); }
.cmp-no   { color: var(--red); }
.cmp-half { color: var(--text-muted); font-size: 0.7rem; }
.cmp-na   { color: var(--text-muted); font-weight: 400; }

/* tooltip */
[title] {
  position: relative;
}

.cmp-table td:not(:first-child) {
  font-size: 1rem;
}

/* legend */
.cmp-legend {
  text-align: center;
  margin-top: 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  justify-content: center;
  gap: 1.25rem;
}

/* table row links */
.cmp-table td:first-child a {
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: 1px dashed var(--border);
}

.cmp-table td:first-child a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* restrictions heading + intro */
.cmp-restrictions-heading {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin-top: 2rem;
  margin-bottom: 0.25rem;
}

.cmp-restrictions-intro {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

/* section divider within detail sections */
.cmp-section-divider {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin-top: 2rem;
  margin-bottom: 0;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

/* ---- comparison detail sections ---- */
.cmp-details {
  padding-top: 0;
}

.cmp-detail {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border);
}

.cmp-detail:last-child { border-bottom: none; }

.cmp-detail h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text);
  scroll-margin-top: calc(var(--nav-h) + 1rem);
}

/* make the anchor target scroll past the fixed nav */
.cmp-detail[id] {
  scroll-margin-top: calc(var(--nav-h) + 1rem);
}

.cmp-detail > p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1rem;
  max-width: 700px;
}

.cmp-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem 1.5rem;
}

@media (max-width: 600px) {
  .cmp-detail-grid { grid-template-columns: 1fr; }
}

.cmp-lang {
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 0.3rem 0;
  line-height: 1.4;
}

.cmp-lang strong {
  color: var(--text);
  font-weight: 600;
}

/* ---- principles ---- */
.principles {
  counter-reset: principle;
}

.principle {
  display: flex;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}

.principle:last-child { border-bottom: none; }

.principle::before {
  counter-increment: principle;
  content: "P" counter(principle);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
  min-width: 2.5rem;
  padding-top: 0.15rem;
}

.principle h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.principle p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ---- footer ---- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.footer-links {
  margin-top: 0.5rem;
  display: flex;
  justify-content: center;
  gap: 1.5rem;
}

/* ---- quack syntax highlighting ---- */
.q .kw       { color: #ff7b72; }  /* keywords */
.q .type     { color: #79c0ff; }  /* types */
.q .func     { color: #d2a8ff; }  /* function names */
.q .str      { color: #a5d6ff; }  /* strings */
.q .num      { color: #79c0ff; }  /* numbers */
.q .comment  { color: #8b949e; font-style: italic; }
.q .cap      { color: #ffa657; }  /* capabilities: mut, take */
.q .op       { color: #e6edf3; }  /* operators */
.q .punct    { color: #8b949e; }  /* punctuation */
.q .enum-v   { color: #7ee787; }  /* enum variants */
.q .effect   { color: #f0a500; }  /* effect annotations */

/* ---- book landing ---- */
.book-landing {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 4rem 1.5rem;
}

.book-hero {
  text-align: center;
  margin-bottom: 3rem;
}

.book-hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.book-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.book-byline {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.book-formats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 3rem;
}

.book-format-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1.5rem 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-card);
  text-decoration: none;
  transition: border-color 0.15s;
}

.book-format-card:hover {
  text-decoration: none;
  border-color: var(--accent);
}

.book-format-primary {
  border-color: var(--accent);
}

.book-format-disabled {
  opacity: 0.6;
  pointer-events: none;
}

.book-format-label {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.book-format-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.book-about h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.book-about p {
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  max-width: 640px;
}

.book-toc {
  margin-top: 2rem;
}

.book-toc h3 {
  font-size: 1rem;
  color: var(--accent);
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

.book-toc ol {
  padding-left: 1.5rem;
  color: var(--text-muted);
}

.book-toc li {
  margin-bottom: 0.25rem;
}

/* ---- thesis ---- */
.thesis-statement {
  font-size: 1.1rem;
  color: var(--text);
  line-height: 1.7;
  text-align: center;
  font-weight: 500;
}

.thesis-guarantees {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem;
  margin-top: 1.5rem;
}

.thesis-guarantees span {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: 999px;
  border: 1px solid var(--green);
  color: var(--green);
  background: rgba(63, 185, 80, 0.08);
}

/* ---- holding page text ---- */
.holding-text {
  max-width: 640px;
  margin: 0 auto;
}

.holding-text p {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 1rem;
}

/* ---- feature grid ---- */
.feature-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 2rem;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

.feature-card {
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-card);
}

.feature-card h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--text);
}

.feature-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ---- status grid ---- */
.status-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1rem;
  margin-top: 2rem;
}

.status-item {
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-card);
  position: relative;
  padding-left: 1.25rem;
  border-left: 3px solid var(--border);
}

.status-item h3 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
  color: var(--text);
}

.status-item p {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.status-item.done { border-left-color: var(--green); }
.status-item.wip { border-left-color: var(--accent); }
.status-item.future { border-left-color: var(--border); }

/* ---- responsive ---- */
@media (max-width: 760px) {
  .feature-grid { grid-template-columns: 1fr; }
  .status-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .hero h1 { font-size: 2rem; }
  .hero .tagline { font-size: 1.05rem; }
  section { padding: 3rem 1rem; }
  .nav-links { gap: 0.75rem; font-size: 0.8rem; }
}