/* Skir — Rausch design system, mirrored from ios/TripPlanner/DesignSystem/AppPalette.swift.
   Single source of truth for the marketing site. Light-only by design. */

:root {
  /* Paper (surfaces) */
  --paper-ivory: #ffffff;
  --paper:       #f7f7f7;
  --paper-soft:  #f2f2f2;
  --paper-deep:  #ebebeb;

  /* Ink (text) */
  --ink-900: #222222;
  --ink-700: #3f3f3f;
  --ink-500: #6a6a6a;
  --ink-300: #929292;
  --ink-200: #c1c1c1;
  --ink-100: #dddddd;

  /* Ember (brand — "Rausch") */
  --ember-50:  #ffe5e9;
  --ember-100: #ffccd4;
  --ember-400: #ff5470;
  --ember-500: #ff385c;
  --ember-600: #e02e4d;

  /* System */
  --shadow-ink: rgba(0, 0, 0, 0.08);
  --shadow-ink-strong: rgba(0, 0, 0, 0.12);

  /* Geometry */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-pill: 999px;

  /* Spacing scale */
  --s-1: 4px;  --s-2: 8px;  --s-3: 12px; --s-4: 16px;
  --s-5: 24px; --s-6: 32px; --s-7: 48px; --s-8: 64px; --s-9: 96px;

  /* Type */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter",
               "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  /* Layout */
  --content-max: 1140px;
  --reading-max: 720px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink-900);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--ember-500);
  text-decoration: none;
  transition: color 120ms ease;
}
a:hover { color: var(--ember-600); }

img, svg { display: block; max-width: 100%; }

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink-900);
}
h1 { font-size: clamp(40px, 6vw, 72px); line-height: 1.05; letter-spacing: -0.03em; }
h2 { font-size: clamp(28px, 3.4vw, 44px); line-height: 1.15; }
h3 { font-size: 20px; line-height: 1.3; }

p { margin: 0 0 var(--s-4); color: var(--ink-700); }

/* ───────────────────────── layout ───────────────────────── */

.container {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--s-5);
}
.reading {
  max-width: var(--reading-max);
  margin: 0 auto;
  padding: 0 var(--s-5);
}

section { padding: var(--s-9) 0; }
@media (max-width: 720px) { section { padding: var(--s-8) 0; } }

/* ───────────────────────── nav ───────────────────────── */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 247, 247, 0.78);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--paper-deep);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--s-2);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}
.nav-brand .mark { color: var(--ember-500); width: 28px; }
.nav-links { display: flex; gap: var(--s-5); }
.nav-links a { color: var(--ink-700); font-weight: 500; font-size: 15px; }
.nav-links a:hover { color: var(--ink-900); }
@media (max-width: 640px) { .nav-links { display: none; } }

/* ───────────────────────── buttons ───────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-2);
  padding: 14px 24px;
  font: inherit;
  font-weight: 600;
  font-size: 16px;
  line-height: 1;
  border: 0;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease, box-shadow 120ms ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--ember-500);
  color: var(--paper-ivory);
  box-shadow: 0 6px 20px -6px rgba(255, 56, 92, 0.55);
}
.btn-primary:hover {
  background: var(--ember-600);
  color: var(--paper-ivory);
  transform: translateY(-1px);
}
.btn-ghost {
  background: transparent;
  color: var(--ink-900);
  border: 1px solid var(--ink-100);
}
.btn-ghost:hover { background: var(--paper-soft); color: var(--ink-900); }
.btn-store {
  background: var(--ink-900);
  color: var(--paper-ivory);
  padding: 14px 22px;
}
.btn-store:hover { background: #000; color: var(--paper-ivory); transform: translateY(-1px); }
.btn-store .small { font-size: 11px; opacity: 0.8; font-weight: 500; }
.btn-store .big   { font-size: 17px; font-weight: 600; letter-spacing: -0.01em; }
.btn-store .stack { display: flex; flex-direction: column; align-items: flex-start; line-height: 1.1; }

/* ───────────────────────── hero ───────────────────────── */

.hero {
  position: relative;
  padding: var(--s-9) 0 var(--s-8);
  text-align: center;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  top: -200px; left: 50%;
  width: 720px; height: 720px;
  transform: translateX(-50%);
  background: radial-gradient(closest-side, var(--ember-50), transparent 70%);
  z-index: 0;
  pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; }
.hero-mark {
  width: 96px;
  margin: 0 auto var(--s-5);
  color: var(--ember-500);
}
.hero h1 { margin-bottom: var(--s-4); }
.hero h1 .accent { color: var(--ember-500); }
.hero-sub {
  font-size: clamp(17px, 2vw, 21px);
  color: var(--ink-500);
  max-width: 580px;
  margin: 0 auto var(--s-6);
}
.hero-ctas {
  display: flex;
  gap: var(--s-3);
  justify-content: center;
  flex-wrap: wrap;
}
.hero-note {
  margin-top: var(--s-4);
  font-size: 14px;
  color: var(--ink-300);
}

/* ───────────────────────── eyebrow ───────────────────────── */

.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ember-500);
  margin-bottom: var(--s-3);
}

/* ───────────────────────── feature grid ───────────────────────── */

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--s-7);
}
.section-head p { color: var(--ink-500); font-size: 18px; }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--s-5);
}
@media (max-width: 900px) { .feature-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .feature-grid { grid-template-columns: 1fr; } }

.feature {
  background: var(--paper-ivory);
  border: 1px solid var(--paper-deep);
  border-radius: var(--radius-lg);
  padding: var(--s-6);
  transition: transform 200ms ease, box-shadow 200ms ease, border-color 200ms ease;
}
.feature:hover {
  transform: translateY(-3px);
  box-shadow: 0 24px 48px -28px var(--shadow-ink-strong);
  border-color: transparent;
}
.feature .icon {
  width: 40px; height: 40px;
  border-radius: var(--radius-md);
  background: var(--ember-50);
  color: var(--ember-500);
  display: grid; place-items: center;
  margin-bottom: var(--s-4);
}
.feature h3 { margin-bottom: var(--s-2); }
.feature p { font-size: 15px; color: var(--ink-500); margin: 0; }

/* ───────────────────────── steps ───────────────────────── */

.steps {
  background: var(--paper-ivory);
  border-top: 1px solid var(--paper-deep);
  border-bottom: 1px solid var(--paper-deep);
}
.step-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-6);
}
@media (max-width: 800px) { .step-grid { grid-template-columns: 1fr; } }
.step .num {
  display: inline-grid; place-items: center;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--ink-900);
  color: var(--paper-ivory);
  font-weight: 700;
  font-size: 15px;
  margin-bottom: var(--s-3);
}
.step h3 { margin-bottom: var(--s-2); }
.step p { color: var(--ink-500); margin: 0; }

/* ───────────────────────── pillars ───────────────────────── */

.pillars {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--s-5);
  max-width: 980px;
  margin: 0 auto;
}
@media (max-width: 720px) { .pillars { grid-template-columns: 1fr; } }
.pillar {
  background: var(--paper-ivory);
  border-radius: var(--radius-lg);
  padding: var(--s-6);
  border: 1px solid var(--paper-deep);
}
.pillar h3 { margin-bottom: var(--s-2); }
.pillar p { margin: 0; color: var(--ink-500); }

/* ───────────────────────── cta band ───────────────────────── */

.cta-band {
  text-align: center;
  background: linear-gradient(135deg, var(--ember-500), var(--ember-400));
  color: var(--paper-ivory);
  border-radius: var(--radius-xl);
  padding: var(--s-8) var(--s-5);
  margin: var(--s-7) auto;
  max-width: var(--content-max);
}
.cta-band h2 { color: var(--paper-ivory); }
.cta-band p  { color: rgba(255, 255, 255, 0.85); font-size: 18px; margin-bottom: var(--s-5); }
.cta-band .btn-store { background: var(--ink-900); color: var(--paper-ivory); }

/* ───────────────────────── footer ───────────────────────── */

.footer {
  background: var(--paper);
  border-top: 1px solid var(--paper-deep);
  padding: var(--s-7) 0 var(--s-6);
  font-size: 14px;
  color: var(--ink-500);
}
.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--s-5);
}
.footer-brand { display: flex; align-items: center; gap: var(--s-2); color: var(--ink-900); font-weight: 700; }
.footer-brand .mark { color: var(--ember-500); width: 24px; }
.footer-links { display: flex; gap: var(--s-5); flex-wrap: wrap; }
.footer-links a { color: var(--ink-500); }
.footer-links a:hover { color: var(--ink-900); }
.footer-meta { width: 100%; margin-top: var(--s-5); color: var(--ink-300); font-size: 13px; }

/* ───────────────────────── policy pages ───────────────────────── */

.doc { padding: var(--s-8) 0; }
.doc h1 { font-size: clamp(32px, 4vw, 48px); margin-bottom: var(--s-3); }
.doc .updated { color: var(--ink-300); font-size: 14px; margin-bottom: var(--s-7); }
.doc h2 { font-size: 22px; margin: var(--s-7) 0 var(--s-3); }
.doc h3 { font-size: 17px; margin: var(--s-5) 0 var(--s-2); color: var(--ink-900); }
.doc p, .doc li { color: var(--ink-700); }
.doc ul { padding-left: 22px; margin: 0 0 var(--s-4); }
.doc li { margin-bottom: var(--s-1); }
.doc table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--s-4) 0;
  font-size: 15px;
}
.doc th, .doc td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--paper-deep);
  vertical-align: top;
}
.doc th { background: var(--paper-soft); font-weight: 600; color: var(--ink-900); }
.doc code {
  background: var(--paper-soft);
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 14px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.callout {
  background: var(--ember-50);
  border-left: 3px solid var(--ember-500);
  padding: var(--s-4) var(--s-5);
  border-radius: var(--radius-md);
  margin: var(--s-5) 0;
}
.callout p { margin: 0; color: var(--ink-700); }

/* ───────────────────────── support FAQ ───────────────────────── */

details.faq {
  background: var(--paper-ivory);
  border: 1px solid var(--paper-deep);
  border-radius: var(--radius-md);
  padding: var(--s-4) var(--s-5);
  margin-bottom: var(--s-3);
  transition: box-shadow 160ms ease;
}
details.faq[open] { box-shadow: 0 18px 40px -28px var(--shadow-ink); }
details.faq > summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--ink-900);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--s-3);
}
details.faq > summary::-webkit-details-marker { display: none; }
details.faq > summary::after {
  content: "+";
  color: var(--ember-500);
  font-weight: 400;
  font-size: 22px;
  transition: transform 160ms ease;
}
details.faq[open] > summary::after { content: "−"; }
details.faq p { margin: var(--s-3) 0 0; color: var(--ink-700); }