/* ==========================================================================
   Coupon Snap — couponsnap.co.uk
   "Minimal Mono, Quiet Utility"
   Tokens mirror the app (src/constants/theme.ts): ink on white, one teal
   accent, amber only for urgency. Shadows in light mode, hairlines in dark.
   ========================================================================== */

/* ---- Tokens -------------------------------------------------------------- */

:root {
  --ink: #131315;
  --ink-secondary: #5D6169;
  --ink-tertiary: #8A8E96;
  --bg: #FFFFFF;
  --surface: #F4F4F6;
  --teal: #0D7A6F;
  --teal-wash: #E3F1EF;
  --on-teal: #FFFFFF;
  --amber: #B45309;
  --amber-wash: #FBF1E5;
  --border: #E2E3E8;
  --border-strong: #C9CBD2;
  --shadow-card: 0 2px 8px rgba(19, 19, 21, 0.06);
  --hairline: 0; /* dark mode swaps shadows for 1px borders */

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 999px;

  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "Cascadia Mono", Consolas, Menlo, monospace;

  --max-width: 1080px;
  --max-prose: 720px;

  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #F2F2F4;
    --ink-secondary: #A8ACB4;
    --ink-tertiary: #71757D;
    --bg: #0B0B0D;
    --surface: #1A1B1E;
    --teal: #3ECCBB;
    --teal-wash: #12312D;
    --on-teal: #062420;
    --amber: #F0A33F;
    --amber-wash: #33270F;
    --border: #2C2D32;
    --border-strong: #3F4147;
    --shadow-card: none;
    --hairline: 1px;
  }
}

/* ---- Base ---------------------------------------------------------------- */

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
}

h1,
h2,
h3 {
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0 0 0.5em;
  text-wrap: balance;
}

h1 { font-size: clamp(1.9rem, 1.2rem + 3.2vw, 3rem); }
h2 { font-size: clamp(1.5rem, 1.15rem + 1.6vw, 2.1rem); }
h3 { font-size: 1.125rem; letter-spacing: -0.01em; }

p {
  margin: 0 0 1em;
}

.lede {
  font-size: 1.125rem;
  color: var(--ink-secondary);
  max-width: 34em;
}

.muted { color: var(--ink-secondary); }
.small { font-size: 0.8125rem; line-height: 1.4; }

a {
  color: var(--teal);
  text-decoration: none;
  text-underline-offset: 3px;
  transition: color 0.15s ease-out;
}

a:hover { text-decoration: underline; }

:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
  border-radius: 4px;
}

::selection { background: var(--teal-wash); }

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

code, .mono {
  font-family: var(--font-mono);
  font-size: 0.875em;
}

/* Eyebrow — small uppercase section label */
.eyebrow {
  display: block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--teal);
  margin: 0 0 12px;
}

.container {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 20px;
}

.prose {
  max-width: var(--max-prose);
}

.prose h2 { margin-top: 2.2em; font-size: 1.4rem; }
.prose h3 { margin-top: 1.6em; }
.prose ul { padding-left: 1.2em; margin: 0 0 1em; }
.prose li { margin-bottom: 0.35em; }

section { padding-block: clamp(56px, 5vw + 32px, 96px); }

.section-head { max-width: 620px; margin-bottom: clamp(28px, 4vw, 48px); }
.section-head p { color: var(--ink-secondary); }

/* ---- Skip link ------------------------------------------------------------ */

.skip-link {
  position: absolute;
  left: 16px;
  top: -48px;
  z-index: 100;
  background: var(--bg);
  color: var(--ink);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 8px 14px;
  transition: top 0.15s ease-out;
}

.skip-link:focus { top: 12px; }

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 60px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  color: var(--ink);
}

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

.brand svg { width: 28px; height: 28px; border-radius: 7px; }

.site-nav {
  display: none;
  gap: 4px;
  margin-left: auto;
}

.site-nav a {
  color: var(--ink-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: color 0.15s ease-out, background-color 0.15s ease-out;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--ink);
  background: var(--surface);
  text-decoration: none;
}

.header-cta { margin-left: auto; }

@media (min-width: 720px) {
  .site-nav { display: flex; }
  .header-cta { margin-left: 0; }
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 11px 20px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.15s ease-out, border-color 0.15s ease-out,
    color 0.15s ease-out, transform 0.15s ease-out;
}

.btn:hover { text-decoration: none; }
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--teal);
  color: var(--on-teal);
}

.btn-primary:hover {
  background: color-mix(in srgb, var(--teal) 88%, var(--ink) 12%);
}

.btn-secondary {
  background: var(--surface);
  color: var(--ink);
  border-color: var(--border);
}

.btn-secondary:hover {
  background: var(--teal-wash);
  border-color: var(--teal);
}

.btn-sm { padding: 7px 14px; font-size: 0.875rem; }

/* ---- Cards ------------------------------------------------------------------ */

.card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: var(--hairline) solid var(--border);
  box-shadow: var(--shadow-card);
  padding: 24px;
}

.card h3 { margin-top: 14px; margin-bottom: 6px; }
.card p { margin: 0; color: var(--ink-secondary); font-size: 0.9375rem; }

.card-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}

@media (min-width: 640px) { .card-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .card-grid.cols-3 { grid-template-columns: repeat(3, 1fr); } }

/* Icon chip at the top of a card */
.card-glyph {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--bg);
  border: var(--hairline) solid var(--border);
  box-shadow: var(--shadow-card);
  color: var(--ink);
}

.card-glyph svg { width: 22px; height: 22px; }

/* ---- Chips / status ----------------------------------------------------------- */

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
}

.chip-active { background: var(--teal-wash); color: var(--teal); }
.chip-expiring { background: var(--amber-wash); color: var(--amber); }

/* Neutral retailer dot — never brand-coloured */
.retailer-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink-tertiary);
  flex: none;
}

.retailer-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  grid-template-columns: 1fr;
}

@media (min-width: 640px) { .retailer-list { grid-template-columns: repeat(2, 1fr); } }

.retailer-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: var(--surface);
  border: var(--hairline) solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  font-weight: 500;
  font-size: 0.9375rem;
}

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

.hero { padding-block: clamp(48px, 6vw, 88px) clamp(56px, 6vw, 96px); }

.hero .container {
  display: grid;
  gap: 48px;
  align-items: center;
  grid-template-columns: 1fr;
}

@media (min-width: 880px) {
  .hero .container { grid-template-columns: 1.05fr 0.95fr; }
}

.hero-copy .lede { margin-block: 16px 28px; }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 14px;
}

.trust-note {
  font-size: 0.8125rem;
  color: var(--ink-tertiary);
  margin: 0;
}

/* Phone mockup */
.phone {
  width: min(320px, 86vw);
  margin-inline: auto;
  border: 2px solid var(--ink);
  border-radius: 40px;
  background: var(--bg);
  padding: 14px;
  box-shadow: var(--shadow-card);
}

@media (prefers-color-scheme: dark) {
  .phone { border-color: var(--border-strong); }
}

.phone-notch {
  width: 84px;
  height: 8px;
  border-radius: var(--radius-pill);
  background: var(--surface);
  border: var(--hairline) solid var(--border);
  margin: 2px auto 14px;
}

.phone-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 700;
  font-size: 0.9375rem;
  letter-spacing: -0.01em;
  padding-inline: 4px;
  margin-bottom: 12px;
}

.phone-title .chip { font-size: 11px; }

/* ---- Ticket voucher card (the brand motif) ------------------------------------- */

.ticket {
  position: relative;
  background: var(--surface);
  border: var(--hairline) solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 16px;
  overflow: hidden;
}

/* Side notches punched at the perforation line */
.ticket::before,
.ticket::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg);
  border: var(--hairline) solid var(--border);
  top: calc(62% - 8px);
}

.ticket::before { left: -9px; }
.ticket::after { right: -9px; }

.ticket-top { padding-bottom: 14px; }

.ticket-retailer {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--ink-secondary);
  margin-bottom: 6px;
}

.ticket-offer {
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
}

.ticket-expiry {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--amber);
  background: var(--amber-wash);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
}

.ticket-bottom {
  border-top: 2px dashed var(--border-strong);
  padding-top: 14px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.ticket-barcode { flex: none; color: var(--ink); }
.ticket-barcode .accent { color: var(--teal); }

.ticket-code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--ink-secondary);
}

.ticket-meta {
  margin-left: auto;
  font-size: 11px;
  font-weight: 600;
  color: var(--ink-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Secondary compact tickets stacked under the hero card */
.ticket-row {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--surface);
  border: var(--hairline) solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  padding: 10px 14px;
  margin-top: 10px;
  font-size: 0.8125rem;
  font-weight: 500;
}

.ticket-row .muted { margin-left: auto; font-size: 12px; }

/* ---- Steps (How it works) ------------------------------------------------------ */

.steps {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
  counter-reset: step;
}

@media (min-width: 800px) { .steps { grid-template-columns: repeat(3, 1fr); } }

.step {
  counter-increment: step;
  background: var(--surface);
  border: var(--hairline) solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 24px;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--teal-wash);
  color: var(--teal);
  font-size: 0.8125rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.step-num::before { content: counter(step); }

.step svg { margin-bottom: 8px; }
.step h3 { margin-bottom: 6px; }
.step p { margin: 0; color: var(--ink-secondary); font-size: 0.9375rem; }

.step-note {
  margin-top: 20px;
  font-size: 0.875rem;
  color: var(--ink-secondary);
}

/* ---- Trust band ----------------------------------------------------------------- */

.trust-band {
  background: var(--surface);
  border-block: 1px solid var(--border);
}

@media (prefers-color-scheme: dark) {
  .trust-band { background: var(--bg); }
}

/* ---- Early access form ------------------------------------------------------------ */

.signup-panel {
  background: var(--surface);
  border: var(--hairline) solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: clamp(24px, 4vw, 40px);
  max-width: 560px;
}

.signup-form {
  display: grid;
  gap: 16px;
  margin-top: 20px;
}

.field label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.field label .optional {
  font-weight: 400;
  color: var(--ink-tertiary);
}

.field input {
  width: 100%;
  font: inherit;
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 11px 14px;
  transition: border-color 0.15s ease-out;
}

.field input:hover { border-color: var(--border-strong); }

.field input:focus {
  outline: none;
  border-color: var(--teal);
  box-shadow: 0 0 0 3px var(--teal-wash);
}

.field input[aria-invalid="true"] { border-color: var(--amber); }

.field-error {
  display: none;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--amber);
  margin-top: 6px;
}

.field-error.visible { display: block; }

.form-status {
  display: none;
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  padding: 12px 16px;
}

.form-status.success {
  display: block;
  background: var(--teal-wash);
  color: var(--teal);
}

.form-status.error {
  display: block;
  background: var(--amber-wash);
  color: var(--amber);
}

.btn[data-loading] { opacity: 0.7; pointer-events: none; }

/* ---- FAQ ---------------------------------------------------------------------------- */

.faq-list {
  max-width: var(--max-prose);
  display: grid;
  gap: 10px;
}

.faq-list details {
  background: var(--surface);
  border: var(--hairline) solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.faq-list summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-weight: 600;
  padding: 16px 20px;
  border-radius: var(--radius-lg);
}

.faq-list summary::-webkit-details-marker { display: none; }

.faq-list summary::after {
  content: "+";
  flex: none;
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--ink-tertiary);
  transition: transform 0.2s ease-out;
}

.faq-list details[open] summary::after { transform: rotate(45deg); color: var(--teal); }

.faq-list details p {
  margin: 0;
  padding: 0 20px 18px;
  color: var(--ink-secondary);
  font-size: 0.9375rem;
  max-width: 60ch;
}

/* ---- Final CTA ------------------------------------------------------------------------ */

.final-cta { text-align: center; }

.final-cta .lede { margin-inline: auto; }
.final-cta .btn { margin-top: 8px; }

/* ---- Page hero (inner pages) ------------------------------------------------------------- */

.page-hero { padding-block: clamp(40px, 5vw, 72px) clamp(24px, 3vw, 40px); }
.page-hero .lede { margin-top: 12px; }

.legal-updated {
  font-size: 0.8125rem;
  color: var(--ink-tertiary);
}

/* Callout — ticket-inspired highlight on legal/support pages */
.callout {
  position: relative;
  background: var(--surface);
  border: var(--hairline) solid var(--border);
  border-left: 3px solid var(--teal);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  padding: 16px 20px;
  margin-block: 24px;
  max-width: var(--max-prose);
}

.callout p { margin: 0; font-size: 0.9375rem; color: var(--ink-secondary); }
.callout p + p { margin-top: 8px; }

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

.site-footer {
  border-top: 1px solid var(--border);
  padding-block: 40px 48px;
  font-size: 0.875rem;
  color: var(--ink-secondary);
}

.footer-top {
  display: flex;
  flex-wrap: wrap;
  gap: 24px 48px;
  justify-content: space-between;
  margin-bottom: 28px;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-nav a { color: var(--ink-secondary); }
.footer-nav a:hover { color: var(--ink); }

.footer-legal {
  max-width: 68ch;
  font-size: 0.8125rem;
  color: var(--ink-tertiary);
}

.footer-legal p { margin-bottom: 0.6em; }

/* ---- Reveal on scroll (respects reduced motion) ------------------------------------------------ */

@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(4px);
    transition: opacity 0.25s ease-out, transform 0.25s ease-out;
  }

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}