/* Torrentech — promotional site & manuals.
   Matches the app (app.torrentech.org): Swiss-minimal dark-teal palette, IBM Plex
   Sans/Mono, sharp corners (radius 0), gold accent, thin borders, transparent
   buttons that fill gold on hover. Palette mirrors frontend/src/index.scss. */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500&family=IBM+Plex+Sans:wght@400;500;600&display=swap');

:root {
  --tt-bg: #18242d;
  --tt-surface: #2a3a45;
  --tt-surface-muted: #243038;
  --tt-surface-deep: #1a2a35;
  --tt-surface-panel: #202a30;
  --tt-surface-raised: #23323c;
  --tt-text: #bfd6e3;
  --tt-heading: #dcebf5;
  --tt-text-muted: rgba(191, 214, 227, 0.62);
  --tt-muted-dim: rgba(191, 214, 227, 0.52);
  --tt-border: #4a5a65;
  --tt-border-strong: #3a4a55;
  --tt-accent: #f1cb7d;
  --tt-accent-bright: #ffbd59;
  --tt-accent-text: #1a262e;
  --tt-row-a: #1e2c38;
  --tt-row-b: #203144;
  --tt-link: #7eb8dc;
  --tt-link-visited: #6ba8a8;
  --tt-mod-accent: #7db9f1;
  --tt-warn: #e6b84d;

  --tt-font-sans: 'IBM Plex Sans', system-ui, sans-serif;
  --tt-font-mono: 'IBM Plex Mono', ui-monospace, monospace;
  --tt-track-label: 0.1em;
  --tt-focus-ring: 0.125em solid var(--tt-accent);

  --maxw: 64rem;
  --measure: 70ch;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  color-scheme: dark;
  font-size: 112.5%;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  font-family: var(--tt-font-sans);
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--tt-text);
  background-color: var(--tt-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* ---------- Typography ---------- */

h1, h2, h3, h4 {
  font-family: var(--tt-font-sans);
  color: var(--tt-heading);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 0.5em;
}

h1 { font-size: clamp(2rem, 5vw, 3.3rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); letter-spacing: -0.015em; }
h3 { font-size: 1.1rem; }

p { margin: 0 0 1.1em; }

a { color: var(--tt-link); text-decoration: none; }
a:visited { color: var(--tt-link-visited); }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

strong { color: var(--tt-heading); font-weight: 600; }

.eyebrow {
  font-family: var(--tt-font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--tt-text-muted);
  margin: 0 0 1.2em;
}

.lede { font-size: 1.1rem; color: var(--tt-text); max-width: var(--measure); }

::selection { color: rgb(29, 31, 66); background: rgb(243, 193, 99); }

a:focus-visible, button:focus-visible {
  outline: var(--tt-focus-ring);
  outline-offset: 0.125em;
}

/* ---------- Layout ---------- */

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 1.5rem; }

section { padding: clamp(3rem, 7vw, 5.5rem) 0; }

.divider { border: 0; border-top: 1px solid var(--tt-border-strong); margin: 0; }

/* ---------- Top bar ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  background: rgba(24, 36, 45, 0.85);
  border-bottom: 1px solid var(--tt-border-strong);
}
.topbar .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 5.5rem;
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}
.brand:hover { text-decoration: none; }
.brand img { height: clamp(2.4rem, 4vw, 3.4rem); width: auto; display: block; }

@media (max-width: 40em) {
  .topbar .wrap { min-height: 4.25rem; }
  .brand img { height: 2rem; }
}
.navlinks { display: flex; align-items: center; gap: 0.5rem; }
.navlinks a:not(.btn) {
  color: var(--tt-text);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: lowercase;
  padding: 0.45em 0.9em;
  border: 1px solid transparent;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.navlinks a:not(.btn):visited { color: var(--tt-text); }
.navlinks a:not(.btn):hover { text-decoration: none; background: rgba(241, 203, 125, 0.08); border-color: var(--tt-border); }

@media (max-width: 40em) {
  .navlinks { gap: 0.25rem; }
  .navlinks .hide-sm { display: none; }
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--tt-font-sans);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: lowercase;
  padding: 0.5rem 1rem;
  border: 1px solid var(--tt-border);
  border-radius: 0;
  color: var(--tt-text);
  background: transparent;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.btn:hover { text-decoration: none; background: var(--tt-accent); color: var(--tt-accent-text); border-color: var(--tt-accent); }
.btn:visited { color: var(--tt-text); }
.btn-primary {
  background: var(--tt-accent);
  color: var(--tt-accent-text);
  border-color: var(--tt-accent);
  font-weight: 600;
}
.btn-primary:visited { color: var(--tt-accent-text); }
.btn-primary:hover { background: var(--tt-accent-bright); border-color: var(--tt-accent-bright); color: var(--tt-accent-text); }
.btn .arrow { transition: transform 0.15s ease; }
.btn:hover .arrow { transform: translateX(3px); }

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

.hero { padding-top: clamp(2.5rem, 6vw, 4.5rem); }
.hero h1 { margin-bottom: 0.35em; }
.hero .accent { color: var(--tt-accent); }
.hero .lede { font-size: clamp(1.05rem, 1.8vw, 1.2rem); margin-bottom: 2rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.6rem; }

.reveal { opacity: 0; transform: translateY(10px); animation: rise 0.6s cubic-bezier(0.2, 0.7, 0.2, 1) forwards; }
.reveal.d1 { animation-delay: 0.05s; }
.reveal.d2 { animation-delay: 0.12s; }
.reveal.d3 { animation-delay: 0.2s; }
@keyframes rise { to { opacity: 1; transform: none; } }

/* ---------- Path cards ---------- */

.paths { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 48em) { .paths { grid-template-columns: 1fr; } }

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 1.75rem 1.6rem;
  border: 1px solid var(--tt-border);
  border-radius: 0;
  background: var(--tt-surface-panel);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}
.card:hover { border-color: var(--accent, var(--tt-accent)); background: var(--tt-surface-raised); }
.card::before {
  content: "";
  position: absolute; inset: 0 0 auto 0; height: 2px;
  background: var(--accent, var(--tt-accent));
}
.card.path-download { --accent: var(--tt-mod-accent); }
.card.path-pin { --accent: var(--tt-accent); }

.card .tier-tag {
  font-family: var(--tt-font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent, var(--tt-accent));
  margin-bottom: 0.9rem;
}
.card h3 { font-size: 1.35rem; margin-bottom: 0.4rem; }
.card p { color: var(--tt-text-muted); font-size: 0.92rem; }
.card ul { margin: 0.2rem 0 1.4rem; padding: 0; list-style: none; }
.card ul li {
  position: relative; padding-left: 1.3rem; margin-bottom: 0.4rem;
  color: var(--tt-text-muted); font-size: 0.9rem;
}
.card ul li::before {
  content: "+"; position: absolute; left: 0;
  color: var(--accent, var(--tt-accent)); font-family: var(--tt-font-mono);
}
.card .card-foot { margin-top: auto; }
.card .card-link {
  font-family: var(--tt-font-mono); font-size: 0.8rem; font-weight: 500;
  color: var(--accent, var(--tt-accent));
  text-transform: lowercase;
  display: inline-flex; align-items: center; gap: 0.4rem;
}
.card .card-link .arrow { transition: transform 0.15s ease; }
.card:hover .card-link .arrow { transform: translateX(4px); }

/* ---------- Feature grid ---------- */

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
@media (max-width: 48em) { .feature-grid { grid-template-columns: 1fr; } }
.feature {
  border-top: 2px solid var(--tt-border);
  padding-top: 1rem;
}
.feature h3 { display: flex; align-items: baseline; gap: 0.5rem; font-size: 1.02rem; }
.feature h3 .num { font-family: var(--tt-font-mono); font-size: 0.75rem; color: var(--tt-accent); }
.feature p { color: var(--tt-text-muted); font-size: 0.9rem; margin-bottom: 0; }

.section-head { max-width: var(--measure); margin-bottom: 2.25rem; }
.section-head p { color: var(--tt-text-muted); }

/* ---------- Manual / article pages ---------- */

.doc { max-width: 48rem; margin: 0 auto; padding: 0 1.5rem; }
.doc-hero { padding: clamp(2rem, 5vw, 3.25rem) 0 1.25rem; }
.doc-hero .kicker {
  font-family: var(--tt-font-mono); font-size: 0.7rem; letter-spacing: 0.2em;
  text-transform: uppercase; margin-bottom: 1rem;
}
.doc-hero.download .kicker { color: var(--tt-mod-accent); }
.doc-hero.pin .kicker { color: var(--tt-accent); }
.doc-hero h1 { font-size: clamp(1.8rem, 4vw, 2.7rem); }
.doc-hero .lede { font-size: 1.08rem; }

.doc article { padding-bottom: 4.5rem; }
.doc article h2 {
  margin-top: 2.6rem; padding-top: 1.5rem; border-top: 1px solid var(--tt-border-strong);
  scroll-margin-top: 5rem;
}
.doc article h3 { margin-top: 1.8rem; }
.doc article p, .doc article li { color: var(--tt-text); }
.doc article ul, .doc article ol { padding-left: 1.3rem; margin: 0 0 1.2em; }
.doc article li { margin-bottom: 0.5em; }
.doc article li::marker { color: var(--tt-text-muted); }

/* step numbering — square to match the app's sharp-corner aesthetic */
.steps { counter-reset: step; list-style: none; padding-left: 0; }
.steps > li {
  position: relative; padding-left: 2.9rem; margin-bottom: 1.4rem;
  min-height: 1.9rem;
}
.steps > li::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: 0; top: 0;
  width: 1.9rem; height: 1.9rem; border-radius: 0;
  display: grid; place-items: center;
  font-family: var(--tt-font-mono); font-size: 0.8rem; font-weight: 500;
  color: var(--tt-accent-text); background: var(--tt-accent);
}
.doc-hero.download ~ article .steps > li::before { background: var(--tt-mod-accent); }
.doc-hero.pin ~ article .steps > li::before { background: var(--tt-accent); }

/* code */
code {
  font-family: var(--tt-font-mono); font-size: 0.84em;
  background: var(--tt-surface); padding: 0.1em 0.4em; border-radius: 0;
  border: 1px solid var(--tt-border-strong); color: var(--tt-text);
}
pre {
  background: var(--tt-surface-deep); border: 1px solid var(--tt-border);
  border-radius: 0; padding: 1rem 1.15rem; overflow-x: auto;
  margin: 0 0 1.4em; font-size: 0.84rem; line-height: 1.5;
}
pre code { background: none; border: 0; padding: 0; color: var(--tt-text); }
pre code .c { color: var(--tt-text-muted); }
pre code .p { color: var(--tt-accent); }

/* callouts */
.note {
  border: 1px solid var(--tt-border); border-left: 2px solid var(--tt-accent);
  background: var(--tt-surface-muted); border-radius: 0;
  padding: 0.9rem 1.1rem; margin: 0 0 1.5em; font-size: 0.92rem;
}
.note.warn { border-left-color: var(--tt-warn); }
.note.tip  { border-left-color: var(--tt-mod-accent); }
.note strong { color: var(--tt-heading); }
.note p:last-child { margin-bottom: 0; }
.note .label {
  font-family: var(--tt-font-mono); font-size: 0.68rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--tt-text-muted); display: block; margin-bottom: 0.4rem;
}

/* comparison table */
.cmp { width: 100%; border-collapse: collapse; margin: 0 0 1.6em; font-size: 0.92rem; border: 1px solid var(--tt-border); }
.cmp th, .cmp td { text-align: left; padding: 0.6rem 0.85rem; border-bottom: 1px solid var(--tt-border-strong); }
.cmp tr:last-child td { border-bottom: 0; }
.cmp thead th { background: var(--tt-surface); }
.cmp th { font-family: var(--tt-font-mono); font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--tt-text-muted); font-weight: 500; }
.cmp tbody tr:nth-child(odd) { background: var(--tt-row-a); }
.cmp tbody tr:nth-child(even) { background: var(--tt-row-b); }
.cmp td:first-child { color: var(--tt-text); }
.cmp .yes { color: var(--tt-accent); }
.cmp .no  { color: var(--tt-text-muted); }

/* prev/next + back nav */
.doc-nav {
  display: flex; flex-wrap: wrap; gap: 0.8rem; justify-content: space-between;
  margin-top: 2.8rem; padding-top: 1.6rem; border-top: 1px solid var(--tt-border-strong);
}

.toc {
  font-family: var(--tt-font-mono); font-size: 0.8rem;
  border: 1px solid var(--tt-border); border-radius: 0;
  padding: 1rem 1.2rem; margin: 0 0 2.5rem; background: var(--tt-surface-muted);
}
.toc .label { color: var(--tt-text-muted); letter-spacing: 0.14em; text-transform: uppercase; font-size: 0.68rem; display: block; margin-bottom: 0.7rem; }
.toc ol { margin: 0; padding-left: 1.2rem; }
.toc li { margin-bottom: 0.35rem; }
.toc a { color: var(--tt-link); }

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

.site-footer { border-top: 1px solid var(--tt-border-strong); padding: 2.5rem 0; color: var(--tt-text-muted); }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 2rem; justify-content: space-between; align-items: flex-start; }
.site-footer a { color: var(--tt-text); }
.site-footer a:hover { color: var(--tt-accent); text-decoration: none; }
.footer-cols { display: flex; gap: 2.5rem; flex-wrap: wrap; }
.footer-col h4 { font-family: var(--tt-font-mono); font-size: 0.68rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--tt-text-muted); font-weight: 500; margin-bottom: 0.8rem; }
.footer-col a { display: block; font-size: 0.88rem; margin-bottom: 0.4rem; }
.footer-meta { font-size: 0.85rem; color: var(--tt-text-muted); max-width: 24rem; }
.footer-meta img { height: 2rem; width: auto; display: block; margin-bottom: 0.9rem; }