/* Chess Redrawn — landing page. Design language mirrors the Flutter app:
   warm cream "paper", faint blue graph grid, red notebook margin, Patrick Hand
   handwriting, blue ballpoint (you) + red pen (opponent) + green highlight, and
   doodled double-stroke borders. */

:root {
  --paper: #f7f4ea;
  --paper-2: #f1ede0;
  --paper-edge: #ede7d6;
  --grid: #cbd7e6;
  --grid-strong: #b6c6da;
  --player: #1f3a5f;   /* blue ballpoint — you */
  --opponent: #b23a33; /* red pen — opponent */
  --green: #2e8b57;    /* highlight */
  --graphite: #2f2f2f; /* primary text (dark, high-contrast) */
  --faint: #555a61;    /* secondary text — still readable, never washed out */
  --gold: #e0a100;
  --shadow: 0 10px 30px rgba(31, 58, 95, 0.10);
  --maxw: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--graphite);
  font-family: "Patrick Hand", "Marker Felt", "Comic Sans MS", system-ui, sans-serif;
  font-size: 20px;
  line-height: 1.5;
  letter-spacing: 0.2px;
  background-color: var(--paper);
  /* graph-paper grid (22px cells, like the app) */
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 23px 23px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* red notebook margin line down the left (desktop only) */
.margin-line {
  position: fixed;
  top: 0; bottom: 0; left: 56px;
  width: 2px;
  background: rgba(178, 58, 51, 0.30);
  pointer-events: none;
  z-index: 1;
}
@media (max-width: 720px) { .margin-line { display: none; } }

.svg-defs { position: absolute; }

a { color: inherit; text-decoration: none; }

/* ------------------------------------------------------------------ layout */
section { position: relative; z-index: 2; padding: 84px 24px; }
.hero, .modes, .sets, .features, .cta, .nav { max-width: var(--maxw); margin: 0 auto; }

.section-title {
  font-size: clamp(30px, 5vw, 46px);
  color: var(--player);
  margin: 0 0 38px;
  font-weight: 400;
}
.squiggle { display: inline-block; width: 64px; height: 12px; vertical-align: middle;
  background: no-repeat center/contain;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 64 12'%3E%3Cpath d='M2 7 Q 9 1 16 6 T 30 6 T 44 6 T 62 5' fill='none' stroke='%23b23a33' stroke-width='2.4' stroke-linecap='round'/%3E%3C/svg%3E");
  opacity: .85;
}

/* ------------------------------------------------------------------ sketch border (doodled double stroke) */
.sketch {
  position: relative;
  background: var(--paper);
  border: 2.4px solid var(--ink, var(--player));
  border-radius: 16px;
}
.sketch::before {
  content: "";
  position: absolute;
  inset: -5px -3px -2px -5px;
  border: 1.5px solid color-mix(in srgb, var(--ink, var(--player)) 38%, transparent);
  border-radius: 15px;
  pointer-events: none;
  transition: inset .18s ease;
}
.tilt { transform: rotate(-0.7deg); transition: transform .18s ease, box-shadow .18s ease; }
.tilt:hover { transform: rotate(0deg) translateY(-2px); }
.tilt:hover::before { inset: -3px -5px -4px -3px; }

/* a softer "torn page" panel (like SketchPanel) */
.sketch-panel {
  background: var(--paper);
  border: 1.6px solid var(--grid-strong);
  border-radius: 14px;
  box-shadow: var(--shadow);
}

/* hand-drawn wobble for purely-decorative boxes (no text inside) */
.sketch-rough { filter: url(#rough-soft); }

/* ------------------------------------------------------------------ nav */
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 24px; position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(6px);
  border-bottom: 1.5px solid color-mix(in srgb, var(--grid-strong) 60%, transparent);
}
.brand { display: inline-flex; align-items: center; gap: 9px; font-size: 24px; }
.brand-mark { color: var(--player); font-size: 26px; line-height: 1; }
.brand-name b { color: var(--player); font-weight: 400; }
.brand-name i { color: var(--opponent); font-style: normal; }
.nav-links { display: flex; align-items: center; gap: 22px; font-size: 19px; }
.nav-links a { color: var(--faint); }
.nav-links a:hover { color: var(--player); }
.nav-cta { color: var(--player) !important; padding: 7px 16px; --ink: var(--player); font-size: 18px; }
@media (max-width: 640px) {
  .nav-links a:not(.nav-cta) { display: none; }
}

/* ------------------------------------------------------------------ hero */
.hero {
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 40px; align-items: center;
  padding-top: 56px; padding-bottom: 40px;
}
.eyebrow { color: var(--green); font-size: 19px; margin: 0 0 6px; letter-spacing: .6px; }
.title { margin: 0; line-height: 0.92; font-weight: 400; }
.t-chess, .t-redrawn { display: inline-block; }
.title .t-chess { color: var(--player); font-size: clamp(54px, 11vw, 104px); }
.title .t-redrawn {
  color: var(--opponent); font-size: clamp(50px, 10vw, 96px); position: relative;
  margin-left: .12em;
}
.hero .title { display: flex; flex-wrap: wrap; align-items: baseline; }
.underline {
  position: absolute; left: -2%; bottom: -0.16em; width: 104%; height: 0.3em;
  overflow: visible;
}
.underline path {
  fill: none; stroke: var(--gold); stroke-width: 4; stroke-linecap: round;
  filter: url(#rough);
  stroke-dasharray: 360; stroke-dashoffset: 360;
  animation: draw 1.1s ease .5s forwards;
}
@keyframes draw { to { stroke-dashoffset: 0; } }

.lede { font-size: clamp(20px, 2.4vw, 25px); color: var(--graphite); max-width: 30ch; margin: 22px 0 26px; }
.lede strong { color: var(--player); font-weight: 400; }

/* store buttons */
.store-row { display: flex; flex-wrap: wrap; gap: 16px; }
.badge {
  --ink: var(--graphite);
  display: inline-flex; align-items: center; gap: 12px;
  padding: 11px 20px 11px 16px; color: var(--graphite);
}
.badge .badge-logo { width: 30px; height: 30px; fill: var(--graphite); }
.badge-text { display: flex; flex-direction: column; line-height: 1.05; text-align: left; }
.badge-text small { font-size: 13px; color: var(--faint); }
.badge-text b { font-size: 23px; font-weight: 400; color: var(--graphite); }
.badge.alt { --ink: var(--green); }
.badge:hover .badge-logo { transform: scale(1.05); }
.soon { font-size: 16px; color: var(--faint); margin: 14px 0 0; }

/* hero art — animated mini board */
.hero-art { display: flex; flex-direction: column; align-items: center; gap: 14px; }
.board {
  --c: 56px;
  width: calc(var(--c) * 6); height: calc(var(--c) * 6);
  display: grid; grid-template-columns: repeat(6, 1fr); grid-template-rows: repeat(6, 1fr);
  background: var(--paper);
  border: 2.6px solid var(--player); border-radius: 10px;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.cell { position: relative; display: grid; place-items: center; font-size: calc(var(--c) * 0.66); }
.cell.dark { background: rgba(31, 58, 95, 0.10); }
.cell .pc { color: var(--player); line-height: 1; transition: filter .5s, opacity .5s, transform .5s; }
.cell .pc.red { color: var(--opponent); }
.cell .pc.bob { animation: bob 3.2s ease-in-out infinite; }
.cell .pc.cooling { filter: grayscale(1) opacity(0.42); transform: scale(0.96); }
.cell .pc.cooling::after {
  content: ""; position: absolute; inset: 12%;
  background: rgba(85, 96, 112, 0.4); border-radius: 50%;
}
@keyframes bob { 0%,100% { transform: translateY(0) } 50% { transform: translateY(-4px) } }
.art-note { font-size: 16px; color: var(--faint); max-width: 22ch; text-align: center; }

@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; gap: 26px; padding-top: 34px; }
  .board { --c: min(13vw, 60px); }
}

/* ------------------------------------------------------------------ modes */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.card { --ink: var(--accent); padding: 26px 24px; }
.card-glyphs { font-size: 40px; line-height: 1; margin-bottom: 8px; color: var(--player); display: flex; gap: 6px; }
.card-glyphs.red { color: var(--opponent); }
.card-glyphs.green { color: var(--green); }
.card-glyphs .cool { animation: cardcool 2.6s ease-in-out infinite; }
@keyframes cardcool { 0%,70%,100% { filter: none; opacity: 1 } 30%,50% { filter: grayscale(1); opacity: .4 } }
.card h3 { color: var(--accent); font-size: 27px; margin: 4px 0 8px; font-weight: 400; }
.card p { color: var(--graphite); margin: 0; font-size: 19px; }
.card p b { color: var(--accent); font-weight: 400; }
@media (max-width: 820px) { .cards { grid-template-columns: 1fr; } }

/* ------------------------------------------------------------------ sets */
.sets-inner { display: grid; grid-template-columns: 1.2fr 1fr; gap: 30px; align-items: center; padding: 34px; }
.sets .section-title { margin-bottom: 14px; }
.sets p { color: var(--graphite); font-size: 20px; margin: 0 0 16px; }
.sets i { color: var(--opponent); font-style: normal; }
.set-list { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px 20px; font-size: 18px; color: var(--faint); }
.set-list .dot { display: inline-block; width: 12px; height: 12px; border-radius: 50%; margin-right: 7px; vertical-align: middle; }
.dot.blue { background: var(--player); } .dot.gold { background: var(--gold); } .dot.red { background: var(--opponent); }
.set-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.chip {
  aspect-ratio: 1; display: grid; place-items: center; font-size: 42px; color: var(--player);
  background: var(--paper); border: 1.8px solid var(--grid-strong); border-radius: 12px;
  box-shadow: var(--shadow); transition: transform .2s;
}
.chip:hover { transform: translateY(-4px) rotate(-2deg); }
.chip.red { color: var(--opponent); }
.chip.secret { color: var(--gold); border-color: var(--gold); border-style: dashed; }
@media (max-width: 820px) { .sets-inner { grid-template-columns: 1fr; } }

/* ------------------------------------------------------------------ features */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.feat { padding: 8px 10px; }
.feat-ico { font-size: 34px; display: inline-block; }
.feat h4 { color: var(--player); font-size: 23px; margin: 6px 0 4px; font-weight: 400; }
.feat p { color: var(--graphite); margin: 0; font-size: 18px; }
@media (max-width: 820px) { .feature-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .feature-grid { grid-template-columns: 1fr; } }

/* ------------------------------------------------------------------ cta */
.cta-inner { text-align: center; padding: 50px 26px; }
.cta-title { justify-content: center; display: flex; gap: .2em; margin-bottom: 6px; }
.cta-title .t-chess { font-size: clamp(44px, 8vw, 72px); }
.cta-title .t-redrawn { font-size: clamp(40px, 7.4vw, 66px); }
.cta .store-row { justify-content: center; margin-top: 22px; }
.cta .lede { margin: 0 auto; max-width: none; }

/* ------------------------------------------------------------------ footer */
.footer { position: relative; z-index: 2; text-align: center; padding: 40px 24px 60px; color: var(--faint); border-top: 1.5px solid color-mix(in srgb, var(--grid-strong) 60%, transparent); }
.foot-brand { font-size: 22px; color: var(--player); margin-bottom: 10px; }
.foot-brand b { font-weight: 400; } .foot-brand i { color: var(--opponent); font-style: normal; }
.foot-brand .brand-mark { font-size: 22px; }
.foot-links { display: flex; flex-wrap: wrap; gap: 18px; justify-content: center; margin-bottom: 12px; font-size: 18px; }
.foot-links a:hover { color: var(--player); }
.foot-fine { font-size: 15px; margin: 0; }

/* ------------------------------------------------------------------ floating bg pieces */
.float-pieces { position: fixed; inset: 0; pointer-events: none; z-index: 0; overflow: hidden; }
.float-pieces span {
  position: absolute; left: var(--x); top: var(--y);
  font-size: calc(64px * var(--s)); color: var(--player);
  opacity: 0.06; animation: floaty 16s ease-in-out infinite; animation-delay: var(--d);
}
.float-pieces span.red { color: var(--opponent); }
@keyframes floaty { 0%,100% { transform: translateY(0) rotate(-4deg) } 50% { transform: translateY(-26px) rotate(4deg) } }

/* ------------------------------------------------------------------ scroll reveal */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s ease, transform .7s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }

/* respect reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
  .underline path { stroke-dashoffset: 0; }
  html { scroll-behavior: auto; }
}