/* ============================================================
   Connect Merge — shared site shell
   Design tokens pulled from the app icon: near-black navy bg,
   cyan→purple gradient, gold accent used sparingly for emphasis.
   Plain CSS, no build step — edit tokens below to retheme.
   ============================================================ */

:root {
  /* Surfaces */
  --bg: #060818;
  --bg-soft: #0b0f26;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-strong: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);

  /* Text */
  --text: #f3f5fb;
  --text-dim: #a7b0cc;
  --text-faint: #7c86a8;

  /* Brand gradient */
  --cyan: #22d3ee;
  --cyan-2: #0ea5e9;
  --purple: #a855f7;
  --purple-2: #7c3aed;
  --gradient: linear-gradient(120deg, var(--cyan) 0%, var(--cyan-2) 35%, var(--purple) 70%, var(--purple-2) 100%);

  /* Gold accent — sparingly */
  --gold: #f6c453;
  --gold-deep: #d99a2b;
  --gradient-gold: linear-gradient(120deg, #ffd876 0%, var(--gold) 55%, var(--gold-deep) 100%);

  /* Type scale */
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  /* Spacing / layout */
  --container: 1120px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body::before {
  /* subtle vignette so the flat navy has depth without a texture asset */
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(60% 45% at 18% -8%, rgba(34, 211, 238, 0.16), transparent 60%),
    radial-gradient(55% 40% at 100% 10%, rgba(168, 85, 247, 0.14), transparent 60%),
    var(--bg);
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }
button { font-family: inherit; }

/* Focus visibility — CRITICAL for keyboard nav */
a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  min-width: 0;
}

@media (min-width: 768px) {
  .container { padding: 0 40px; }
}

/* ---------- Type helpers ---------- */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gradient);
}

.section-title {
  font-size: clamp(1.6rem, 1.1rem + 2vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.2;
  margin-top: 12px;
}

.section-sub {
  color: var(--text-dim);
  font-size: 1.05rem;
  line-height: 1.7;
  max-width: 640px;
  margin-top: 14px;
}

.grad-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

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

.section {
  padding: 64px 0;
}

@media (min-width: 768px) {
  .section { padding: 96px 0; }
}

.section-head {
  max-width: 640px;
}

.section-head--center {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 24px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.98rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 180ms var(--ease-out), box-shadow 180ms var(--ease-out), opacity 180ms var(--ease-out);
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-gold);
  color: #1a1204;
  box-shadow: 0 8px 24px -8px rgba(246, 196, 83, 0.5);
}

.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 12px 28px -8px rgba(246, 196, 83, 0.6); }
.btn-primary:active { transform: translateY(0); }

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border-strong);
}

.btn-ghost:hover { border-color: var(--cyan); background: var(--surface); }

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: default;
  pointer-events: none;
}

.btn-full { width: 100%; white-space: normal; text-align: center; }

/* ---------- Chips / mode pills ---------- */

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.chip {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  background: var(--surface);
  border: 1px solid var(--border);
  min-width: 148px;
}

.chip-name {
  font-weight: 700;
  font-size: 0.95rem;
}

.chip-desc {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.5;
}

.chip--easy .chip-name { color: var(--cyan); }
.chip--medium .chip-name { color: var(--cyan-2); }
.chip--hard .chip-name { color: var(--purple); }
.chip--legendary { border-color: var(--border-strong); }
.chip--legendary .chip-name { color: var(--purple-2); }

.chip--challenge {
  background: linear-gradient(160deg, rgba(246, 196, 83, 0.12), rgba(246, 196, 83, 0.03));
  border-color: rgba(246, 196, 83, 0.35);
}

.chip--challenge .chip-name { color: var(--gold); }

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

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.card-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: var(--surface-strong);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.card-icon svg { width: 20px; height: 20px; }

.card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.card p {
  color: var(--text-dim);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* ---------- Tiles (2048-style visual, CSS-only, no game screenshot needed) ---------- */

.board {
  --gap: 8px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap);
  padding: 12px;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, var(--bg-soft), rgba(11, 15, 38, 0.6));
  border: 1px solid var(--border);
  max-width: 320px;
}

.tile {
  aspect-ratio: 1;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.95rem;
  color: var(--text);
  background: var(--surface-strong);
  border: 1px solid var(--border);
  position: relative;
}

.tile--2 { background: rgba(34, 211, 238, 0.14); border-color: rgba(34, 211, 238, 0.25); }
.tile--4 { background: rgba(34, 211, 238, 0.24); border-color: rgba(34, 211, 238, 0.35); }
.tile--8 { background: rgba(94, 172, 235, 0.3); border-color: rgba(94, 172, 235, 0.4); }
.tile--16 { background: rgba(168, 85, 247, 0.32); border-color: rgba(168, 85, 247, 0.45); }
.tile--32 { background: rgba(168, 85, 247, 0.5); border-color: rgba(168, 85, 247, 0.6); }
.tile--gold {
  background: var(--gradient-gold);
  color: #1a1204;
  border-color: transparent;
  box-shadow: 0 0 0 1px rgba(246, 196, 83, 0.5), 0 6px 18px -6px rgba(246, 196, 83, 0.6);
}
.tile--empty { background: rgba(255, 255, 255, 0.02); border-color: rgba(255, 255, 255, 0.05); }

.tile--chained::after {
  content: "";
  position: absolute;
  inset: -3px;
  border-radius: 13px;
  border: 2px solid var(--gold);
  opacity: 0.9;
}

@media (prefers-reduced-motion: no-preference) {
  .tile--pulse { animation: tile-pulse 2.4s ease-in-out infinite; }
}

@keyframes tile-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(246, 196, 83, 0.35); }
  50% { box-shadow: 0 0 0 6px rgba(246, 196, 83, 0.08); }
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  background: rgba(6, 8, 24, 0.72);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.05rem;
}

.brand img { width: 30px; height: 30px; border-radius: 7px; }

.nav-links {
  display: none;
  align-items: center;
  gap: 28px;
  font-size: 0.92rem;
  color: var(--text-dim);
}

.nav-links a { transition: color 150ms var(--ease-out); }
.nav-links a:hover { color: var(--text); }

@media (min-width: 768px) {
  .nav-links { display: flex; }
}

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

.hero {
  padding: 56px 0 64px;
}

@media (min-width: 768px) {
  .hero { padding: 88px 0 96px; }
}

.hero-grid {
  display: grid;
  gap: 48px;
  align-items: center;
}

@media (min-width: 960px) {
  .hero-grid { grid-template-columns: 1.1fr 0.9fr; }
}

.hero h1 {
  font-size: clamp(2.1rem, 1.4rem + 3.2vw, 3.4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.12;
  margin-top: 16px;
}

.hero-fairness {
  margin-top: 14px;
  font-size: 1.15rem;
  color: var(--text);
  font-weight: 600;
}

.hero-sub {
  margin-top: 16px;
  color: var(--text-dim);
  font-size: 1.05rem;
  line-height: 1.7;
  max-width: 520px;
}

.hero-visual { display: flex; justify-content: center; }

/* ---------- Store badges ---------- */

.store-badges {
  display: flex;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 28px;
}

.store-badges--centered { justify-content: center; }

.store-badges img {
  width: auto;
  height: 52px;
}

.store-badge-coming-soon img {
  filter: grayscale(1);
  opacity: 0.45;
}

.store-badge-coming-soon p {
  margin-top: 4px;
  color: var(--text-faint);
  font-size: 0.8rem;
  line-height: 1.4;
  text-align: center;
}

/* ---------- Grids ---------- */

.grid {
  display: grid;
  gap: 20px;
}

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

@media (min-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* ---------- Fair-play comparison ---------- */

.fair-boards {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 32px;
}

.fair-board-label {
  text-align: center;
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--text-dim);
  font-weight: 600;
}

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

.site-footer {
  border-top: 1px solid var(--border);
  padding: 56px 0 32px;
}

.footer-top {
  display: flex;
  flex-direction: column;
  gap: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}

@media (min-width: 768px) {
  .footer-top { flex-direction: row; justify-content: space-between; align-items: flex-end; }
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 24px;
  font-size: 0.85rem;
  color: var(--text-faint);
}

@media (min-width: 640px) {
  .footer-bottom { flex-direction: row; justify-content: space-between; align-items: center; }
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a { color: var(--text-dim); }
.footer-links a:hover { color: var(--text); }

/* ---------- Real screenshots ---------- */

.phone-frame {
  margin: 0 auto;
  border-radius: 28px;
  border: 1px solid var(--border-strong);
  background: var(--bg-soft);
  overflow: hidden;
  box-shadow: 0 24px 60px -24px rgba(0, 0, 0, 0.65);
}

.ui-snippet {
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  overflow: hidden;
}

.phone-frame img,
.ui-snippet img {
  display: block;
  width: 100%;
  height: auto;
}

.modes-layout {
  display: grid;
  gap: 32px;
  align-items: center;
  margin-top: 32px;
}

@media (min-width: 900px) {
  .modes-layout { grid-template-columns: 1.1fr 0.9fr; }
}

.showcase-bento {
  display: grid;
  gap: 16px;
  margin-top: 40px;
}

.showcase-stack {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

@media (min-width: 768px) {
  .showcase-bento { grid-template-columns: 0.85fr 1fr; align-items: stretch; }
  .showcase-stack { justify-content: center; }
}

/* ---------- Scroll reveal ---------- */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 600ms var(--ease-out), transform 600ms var(--ease-out);
}

.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .tile--pulse { animation: none; }
  * { scroll-behavior: auto !important; }
}

html { scroll-behavior: smooth; }

/* ---------- Legal / utility pages (privacy-policy, delete-my-data) ---------- */

.page-narrow {
  max-width: 680px;
  margin: 0 auto;
  padding: 56px 24px 64px;
}

.prose p { margin-top: 0.9rem; color: var(--text-dim); }
.prose h2 { font-size: 1.15rem; font-weight: 700; margin-top: 2.2rem; }
.prose ul { list-style: disc; padding-left: 1.4rem; margin-top: 0.9rem; color: var(--text-dim); }
.prose li { margin-top: 0.5rem; }
.prose strong { color: var(--text); }
.prose a { color: var(--cyan); }
.prose a:hover { text-decoration: underline; }

.page-form label {
  display: block;
  font-weight: 600;
  margin: 1.5rem 0 0.4rem;
}

.page-form .hint {
  font-weight: 400;
  color: var(--text-faint);
  font-size: 0.85rem;
}

.page-form input,
.page-form textarea {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  font: inherit;
}

.page-form ::placeholder { color: var(--text-faint); }
.page-form textarea { min-height: 110px; resize: vertical; }

.btn-danger {
  background: #e5484d;
  color: #fff;
  box-shadow: 0 8px 24px -8px rgba(229, 72, 77, 0.5);
}

.btn-danger:hover { transform: translateY(-1px); box-shadow: 0 12px 28px -8px rgba(229, 72, 77, 0.6); }
.btn-danger:active { transform: translateY(0); }

.form-error { color: #ff8a8e; font-size: 0.9rem; margin-top: 0.8rem; }

/* ---------- Deep-link page (link.html) specific ---------- */

.link-shell {
  min-height: calc(100dvh - 72px);
  display: flex;
  align-items: center;
}

.link-card {
  max-width: 480px;
  margin: 0 auto;
  text-align: center;
  padding: 40px 32px;
}

.link-card h1 {
  font-size: 1.6rem;
  font-weight: 800;
  margin-top: 18px;
  line-height: 1.3;
}

.link-card p {
  margin-top: 12px;
  color: var(--text-dim);
  line-height: 1.6;
}

.link-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 28px;
}