/* The Tin — thetinapp.com
   Voice: the app's own — system faces, quiet chrome, brand color spent on the tin. */

:root {
  /* Brand (from DESIGN.md — committed identity, do not drift) */
  --tin-blue: #3b74c9;
  --tin-lid: #5d90dd;
  --tin-shadow: #16386f;
  --gold: #eebb62;
  --gold-deep: #d99f3d;
  --cover-manila: #e8d6a3;
  --cover-sky: #a8c7e0;
  --cover-sage: #b5c9a8;
  --cover-clay: #d9a699;
  --cover-plum: #baa3c9;
  --cover-teal: #94c4bf;
  --cover-rose: #dbabbf;

  /* Enamel — the tin's exterior (hero, closing band) */
  --enamel: #12213f;
  --enamel-deep: #0d1830;
  --enamel-ink: #f2f5fb;
  --enamel-muted: #b9c6de;

  /* Interior — light scheme */
  --bg: #ffffff;
  --bg-inset: #f4f6f9;
  --ink: #1b2330;
  --ink-2: #465163;
  --ink-3: #6a7488;
  --line: #e3e7ee;
  --link: #2d61b0;

  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", system-ui, sans-serif;
  --serif: ui-serif, "New York", Georgia, serif;
  --rounded: ui-rounded, "SF Pro Rounded", var(--sans);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --measure: 62ch;
  --container: 68rem;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1420;
    --bg-inset: #161e2e;
    --ink: #e8ecf4;
    --ink-2: #aeb9cc;
    --ink-3: #8291a8;
    --line: #263149;
    --link: #85ace4;
  }
}

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 1.0625rem; /* 17px — the app's body size */
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  font-kerning: normal;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--link); text-underline-offset: 0.15em; }
a:hover { text-decoration-thickness: 2px; }

h1, h2, h3 { text-wrap: balance; line-height: 1.15; margin: 0; }
p { margin: 0 0 var(--space-4); text-wrap: pretty; }

:focus-visible {
  outline: 2px solid var(--tin-blue);
  outline-offset: 3px;
  border-radius: 2px;
}

.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 2.5rem);
}

/* ---------- Header ---------- */

.site-header {
  position: absolute;
  inset-inline: 0;
  top: 0;
  z-index: 10;
  padding-block: var(--space-4);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: inherit;
}

.wordmark svg { flex: none; }

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 2.5vw, 1.75rem);
  font-size: 0.9375rem;
  font-weight: 500;
}

.site-nav a { text-decoration: none; color: inherit; opacity: 0.85; }
.site-nav a:hover { opacity: 1; text-decoration: underline; }

.on-enamel { color: var(--enamel-ink); }

/* ---------- Hero: the closed tin, opening ---------- */

.hero {
  background:
    radial-gradient(120% 90% at 50% 0%, #1b3563 0%, var(--enamel) 55%, var(--enamel-deep) 100%);
  color: var(--enamel-ink);
  padding-block: clamp(7rem, 16vh, 10rem) clamp(4rem, 10vh, 7rem);
  overflow: clip;
}

.hero .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-8);
  text-align: center;
}

.hero .container > * { max-width: 100%; }

.hero h1 {
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(2.5rem, 5.2vw + 1rem, 4.5rem);
  letter-spacing: -0.025em;
  max-width: 18ch;
}

.hero h1 em {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--gold);
}

.hero .lead {
  font-size: clamp(1.125rem, 1vw + 0.9rem, 1.3125rem);
  line-height: 1.55;
  letter-spacing: 0.005em;
  color: var(--enamel-muted);
  max-width: 52ch;
  margin: 0;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.5rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 1.0625rem;
  text-decoration: none;
  transition: transform 0.35s var(--ease-out), box-shadow 0.35s var(--ease-out);
}

.btn-light { background: var(--enamel-ink); color: var(--enamel-deep); }
.btn-light:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgb(0 0 0 / 0.35); }

.btn-blue { background: var(--tin-blue); color: #fff; }
.btn-blue:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgb(59 116 201 / 0.35); }

.soon-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  border: 1px solid rgb(238 187 98 / 0.5);
  border-radius: 999px;
  color: var(--gold);
  font-weight: 600;
  font-size: 0.9375rem;
}

/* The ledger — real facts in the app's caption-ledger voice */
.ledger {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  column-gap: var(--space-6);
  row-gap: var(--space-2);
  font-size: 0.875rem;
  letter-spacing: 0.01em;
  color: var(--enamel-muted);
  font-variant-numeric: tabular-nums;
}

.ledger span { display: inline-flex; align-items: center; gap: var(--space-6); }

.ledger span + span::before {
  content: "·";
  color: rgb(185 198 222 / 0.5);
}

.ledger strong { color: var(--enamel-ink); font-weight: 600; }

/* ---------- The animated tin ---------- */

.tin-stage { width: clamp(150px, 22vw, 210px); }

.tin-svg { width: 100%; height: auto; overflow: visible; }

.tin-card-anim {
  animation: card-rise 2.8s infinite;
  will-change: transform;
}

.tin-lid-anim {
  transform-origin: 9px 38px; /* bottom-left of the lid, viewBox units */
  animation: lid-open 2.8s infinite;
  will-change: transform;
}

/* Timeline mirrors TinLoadingView.swift (Σ 2.8s):
   lid  0→.5 open · hold →2.0 · →2.5 close · hold →2.8
   card 0→.5 rest · →1.1 rise · hold →1.4 · →2.0 drop · rest →2.8 */
@keyframes lid-open {
  0%     { transform: rotate(0deg); animation-timing-function: cubic-bezier(0.33, 0, 0.2, 1); }
  17.9%  { transform: rotate(-26deg); animation-timing-function: linear; }
  71.4%  { transform: rotate(-26deg); animation-timing-function: cubic-bezier(0.33, 0, 0.2, 1); }
  89.3%, 100% { transform: rotate(0deg); }
}

@keyframes card-rise {
  0%, 17.9% { transform: translateY(0); animation-timing-function: cubic-bezier(0.33, 0, 0.2, 1); }
  39.3%  { transform: translateY(-32px); animation-timing-function: linear; }
  50%    { transform: translateY(-32px); animation-timing-function: cubic-bezier(0.33, 0, 0.2, 1); }
  71.4%, 100% { transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  .tin-card-anim { animation: none; transform: translateY(-32px); }
  .tin-lid-anim { animation: none; transform: rotate(-26deg); }
  .btn { transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Inside the tin: features ---------- */

.interior { padding-block: clamp(4rem, 10vh, 7rem); }

.divider-tab {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 600;
  font-size: clamp(1.125rem, 1vw + 1rem, 1.375rem);
  color: var(--ink-2);
  margin-bottom: var(--space-2);
}

.divider-tab::after {
  content: "";
  display: block;
  width: 3.5rem;
  height: 3px;
  border-radius: 2px;
  margin-top: 0.6rem;
  background: var(--tab-color, var(--tin-blue));
}

.feature {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  align-items: center;
  gap: clamp(2rem, 6vw, 5rem);
  padding-block: clamp(2.5rem, 6vh, 4.5rem);
}

.feature:nth-of-type(even) .feature-media { order: -1; }

.feature h2 {
  font-size: clamp(1.75rem, 2.2vw + 1rem, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
}

.feature p { color: var(--ink-2); max-width: 46ch; }

.feature .fine {
  font-size: 0.875rem;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}

/* Screenshot slot: a labeled card sleeve until real captures land.
   Swap the .sleeve div for <img class="shot"> — layout is identical. */
.feature-media { display: grid; justify-items: center; }

.device {
  width: min(300px, 78vw);
  aspect-ratio: 300 / 620;
  border-radius: 44px;
  padding: 12px;
  background: linear-gradient(160deg, #2a3140, #14181f);
  box-shadow:
    0 2px 6px rgb(20 30 50 / 0.25),
    0 24px 48px -16px rgb(20 30 50 / 0.35);
}

.device-screen {
  width: 100%;
  height: 100%;
  border-radius: 34px;
  overflow: hidden;
  background: var(--bg-inset);
}

.shot { width: 100%; height: 100%; object-fit: cover; }

.sleeve {
  width: 100%;
  height: 100%;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: var(--space-3);
  background:
    linear-gradient(rgb(255 255 255 / 0.16), rgb(0 0 0 / 0.04)),
    var(--sleeve-color, var(--cover-manila));
}

.sleeve svg { opacity: 0.55; }

.sleeve-label {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 600;
  font-size: 1.25rem;
  color: rgb(27 35 48 / 0.72);
}

/* ---------- Enamel band: privacy ---------- */

.band {
  background: linear-gradient(180deg, var(--enamel) 0%, var(--enamel-deep) 100%);
  color: var(--enamel-ink);
  padding-block: clamp(4rem, 10vh, 6.5rem);
}

.band .container { display: grid; gap: var(--space-8); }

.band h2 {
  font-size: clamp(1.875rem, 2.4vw + 1rem, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  max-width: 22ch;
}

.band h2 em {
  font-family: var(--serif);
  font-weight: 600;
  color: var(--gold);
}

.band .lead-p { color: var(--enamel-muted); max-width: var(--measure); font-size: 1.125rem; }

.truths {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: var(--space-6) var(--space-8);
  padding: 0;
  margin: 0;
  list-style: none;
}

.truths h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: var(--space-1);
  color: var(--enamel-ink);
}

.truths p { color: var(--enamel-muted); font-size: 0.9375rem; margin: 0; line-height: 1.55; }

.band a { color: var(--gold); }

/* ---------- Open source ---------- */

.open-source { padding-block: clamp(4rem, 10vh, 6.5rem); }

.open-source .container {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: start;
}

.open-source h2 {
  font-size: clamp(1.75rem, 2.2vw + 1rem, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
}

.open-source p { color: var(--ink-2); max-width: var(--measure); }

.repo-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  background: var(--bg-inset);
  display: grid;
  gap: var(--space-3);
}

.repo-card .repo-name {
  font-weight: 700;
  font-size: 1.125rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--ink);
  text-decoration: none;
}

.repo-card .repo-name:hover { text-decoration: underline; }

.repo-card p { font-size: 0.9375rem; color: var(--ink-2); margin: 0; }

.repo-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-size: 0.8125rem;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}

.repo-meta span {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.15rem 0.65rem;
  background: var(--bg);
}

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

.site-footer {
  border-top: 1px solid var(--line);
  padding-block: var(--space-12);
  font-size: 0.875rem;
  color: var(--ink-3);
}

.site-footer .container { display: grid; gap: var(--space-6); }

.footer-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.footer-links { display: flex; flex-wrap: wrap; gap: var(--space-6); }
.footer-links a { color: var(--ink-2); text-decoration: none; }
.footer-links a:hover { text-decoration: underline; }

.legal { max-width: 75ch; line-height: 1.6; margin: 0; }

/* ---------- Document pages (privacy, support) ---------- */

.doc-header {
  position: static;
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}

.doc {
  padding-block: clamp(3rem, 8vh, 5rem);
}

.doc .container { max-width: 46rem; }

.doc h1 {
  font-size: clamp(2rem, 3vw + 1rem, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-2);
}

.doc .doc-date {
  font-size: 0.875rem;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
  margin-bottom: var(--space-8);
}

.doc h2 {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: var(--space-12) 0 var(--space-3);
}

.doc h3 { font-size: 1.0625rem; font-weight: 600; margin: var(--space-6) 0 var(--space-2); }

.doc p, .doc li { color: var(--ink-2); max-width: var(--measure); }

.doc ul { padding-left: 1.25rem; margin: 0 0 var(--space-4); }
.doc li { margin-bottom: var(--space-2); }

.doc .callout {
  border: 1px solid var(--line);
  background: var(--bg-inset);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-6);
  margin-block: var(--space-6);
}

.doc .callout p { margin: 0; }

/* ---------- Reveal (progressive; content visible without JS) ---------- */

.reveal-ready .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

.reveal-ready .reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal-ready .reveal { opacity: 1; transform: none; transition: none; }
}

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

@media (max-width: 760px) {
  .feature { grid-template-columns: 1fr; gap: var(--space-8); }
  .feature:nth-of-type(even) .feature-media { order: 0; }
  .open-source .container { grid-template-columns: 1fr; }
  .site-nav { font-size: 0.875rem; }
}