/* ==========================================
   Vivek Chess Labs — Shared Design System
   Clay #D97757 · Ink #1A1915 · Cream #F4F2EC
   ========================================== */

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
img { display: block; max-width: 100%; }
body {
  font-family: 'Space Grotesk', sans-serif;
  background: #fff;
  color: #1A1915;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Tokens */
:root {
  --clay:      #D97757;
  --clay-deep: #BE5D3B;
  --clay-pale: #F5E3D8;
  --ink:       #1A1915;
  --ink-soft:  #3A3833;
  --cream:     #F4F2EC;
  --paper:     #FFFFFF;
  --bg:        #EFEEE8;
  --muted:     #8A8680;
  --line:      #DAD7CD;
  --board-lt:  #F0D9B5;
  --board-dk:  #B58863;
  --r-sm: 8px; --r-md: 14px; --r-lg: 22px; --r-xl: 32px;
}

/* Type base */
h1, h2, h3, h4, h5 {
  font-weight: 700; letter-spacing: -.022em; line-height: 1.08;
  color: var(--ink); text-wrap: balance;
}
p { color: var(--ink-soft); }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* Layout */
.container    { max-width: 1120px; margin: 0 auto; padding: 0 44px; }
.container-sm { max-width: 820px;  margin: 0 auto; padding: 0 44px; }
.section      { padding: 96px 0; }
.grid-2       { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.grid-3       { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
.grid-4       { display: grid; grid-template-columns: repeat(4,1fr); gap: 24px; }
.grid-split   { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }

/* Kicker label */
.kicker {
  display: block;
  font-family: 'Space Mono', monospace;
  font-size: 11px; letter-spacing: .26em; text-transform: uppercase;
  color: var(--clay); margin-bottom: 16px;
}
.kicker-muted { color: var(--muted); }

/* ---- BUTTONS ---- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 28px; border-radius: var(--r-md);
  font-family: 'Space Grotesk', sans-serif; font-size: 16px; font-weight: 600;
  cursor: pointer; transition: all .14s ease; border: none;
  text-decoration: none; letter-spacing: -.01em; white-space: nowrap;
}
.btn-sm { padding: 10px 20px; font-size: 14px; }
.btn-primary { background: var(--clay); color: #fff; }
.btn-primary:hover {
  background: var(--clay-deep); transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(217,119,87,.32);
}
.btn-ink { background: var(--ink); color: #fff; }
.btn-ink:hover {
  background: #000; transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(26,25,21,.22);
}
.btn-outline { background: transparent; color: var(--ink); border: 1.5px solid var(--ink); }
.btn-outline:hover { background: var(--ink); color: #fff; }
.btn-outline-invert { background: transparent; color: #fff; border: 1.5px solid rgba(255,255,255,.3); }
.btn-outline-invert:hover { background: rgba(255,255,255,.1); border-color: #fff; }
.arrow { display: inline-block; transition: transform .14s; }
.btn:hover .arrow { transform: translateX(3px); }

/* ---- CARD ---- */
.card {
  background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--r-lg); padding: 36px;
  box-shadow: 0 1px 4px rgba(0,0,0,.055);
}

/* ---- NAV ---- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(244,242,236,.9);
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; height: 68px; }
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  margin-right: auto; font-weight: 700; font-size: 17px;
  letter-spacing: -.02em; color: var(--ink);
}
.nav-logo img { width: 30px; height: 30px; }
.t-clay { color: var(--clay); }
.nav-links { display: flex; align-items: center; gap: 2px; }
.nav-links a {
  font-size: 15px; font-weight: 500; color: var(--ink-soft);
  padding: 8px 12px; border-radius: var(--r-sm); transition: all .12s;
}
.nav-links a:hover, .nav-links a.active { color: var(--ink); background: rgba(26,25,21,.07); }
.nav-actions { display: flex; gap: 10px; margin-left: 20px; align-items: center; }

/* ---- HERO ---- */
.hero {
  background: var(--ink); position: relative; overflow: hidden;
  padding: 112px 0 96px;
}
.hero::before {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background-image: repeating-conic-gradient(rgba(255,255,255,.03) 0% 25%, transparent 0% 50%);
  background-size: 56px 56px;
}
.hero-inner {
  display: grid; grid-template-columns: 1fr 1fr; gap: 64px;
  align-items: center; position: relative; z-index: 1;
}
.hero h1 { font-size: 70px; color: #fff; margin: 10px 0 22px; line-height: 1.04; }
.hero-sub {
  color: rgba(244,242,236,.62); font-size: 19px;
  margin-bottom: 36px; max-width: 460px; line-height: 1.65;
}
.hero-pills { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 22px; }
.hero-pills span {
  font-family: 'Space Mono', monospace; font-size: 11px; letter-spacing: .09em;
  text-transform: uppercase; color: rgba(244,242,236,.38);
  border: 1px solid rgba(255,255,255,.1); border-radius: 999px; padding: 6px 14px;
}
.hero-visual { display: flex; justify-content: center; }
.hero-badge {
  width: 360px; height: 360px; background: var(--cream); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 48px 100px rgba(0,0,0,.44);
}

/* ---- PAGE HERO (inner pages) ---- */
.page-hero {
  background: var(--ink); padding: 68px 0 56px;
  position: relative; overflow: hidden;
}
.page-hero::before {
  content: ''; position: absolute; inset: 0;
  background-image: repeating-conic-gradient(rgba(255,255,255,.025) 0% 25%, transparent 0% 50%);
  background-size: 40px 40px;
}
.page-hero .container { position: relative; z-index: 1; }
.page-hero h1 { font-size: 52px; color: #fff; margin: 10px 0 14px; }
.page-sub { color: rgba(244,242,236,.58); font-size: 18px; max-width: 620px; line-height: 1.65; }

/* ---- FREE SECTION CARDS ---- */
.free-card {
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--r-lg); padding: 36px 30px;
  display: flex; flex-direction: column; gap: 14px;
  transition: all .18s; text-decoration: none;
}
.free-card:hover {
  background: rgba(255,255,255,.09);
  border-color: rgba(255,255,255,.22);
  transform: translateY(-3px);
}
.free-card-num {
  font-family: 'Space Mono', monospace;
  font-size: 11px; letter-spacing: .18em; color: var(--clay);
}
.free-card h3 { color: #fff; font-size: 28px; flex: 1; }
.free-card-arrow { font-size: 22px; color: rgba(255,255,255,.25); transition: all .15s; }
.free-card:hover .free-card-arrow { transform: translateX(5px); color: var(--clay); }

.resource-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--r-lg); padding: 36px 30px;
  display: flex; flex-direction: column; gap: 14px;
  transition: all .18s; text-decoration: none;
  box-shadow: 0 1px 4px rgba(0,0,0,.045);
}
.resource-card:hover {
  border-color: var(--clay);
  box-shadow: 0 8px 24px rgba(0,0,0,.07);
  transform: translateY(-3px);
}
.resource-card h3 { color: var(--ink); font-size: 28px; flex: 1; }
.resource-card .free-card-arrow { color: rgba(26,25,21,.28); }
.resource-card:hover .free-card-arrow { transform: translateX(5px); color: var(--clay); }

/* ---- PHOTO PLACEHOLDER ---- */
.photo-ph {
  background: repeating-linear-gradient(-45deg, var(--bg), var(--bg) 14px, var(--line) 14px, var(--line) 16px);
  border-radius: var(--r-lg); display: flex; align-items: center; justify-content: center;
  aspect-ratio: 4/5; width: 100%; max-width: 400px;
}
.photo-ph span {
  font-family: 'Space Mono', monospace; font-size: 12px;
  letter-spacing: .08em; color: var(--muted); text-transform: uppercase;
}
.coach-photo-wrap {
  width: 100%; max-width: 400px; aspect-ratio: 4 / 5;
  border-radius: var(--r-lg); overflow: hidden;
  background: var(--bg); border: 1px solid var(--line);
  box-shadow: 0 1px 4px rgba(0,0,0,.055);
}
.coach-photo {
  width: 100%; height: 100%; object-fit: cover;
  object-position: center top;
}

/* ---- ACHIEVEMENT PILLS ---- */
.ach-list { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.ach-pill {
  background: var(--bg); border: 1px solid var(--line);
  border-radius: 999px; padding: 8px 16px;
  font-size: 14px; color: var(--ink); font-weight: 500;
}

/* ---- BOARD EMBED (Lichess) ---- */
.board-wrap {
  position: relative; border-radius: var(--r-lg); overflow: hidden;
  border: 1px solid var(--line); min-height: 400px;
  background-image: repeating-conic-gradient(var(--board-lt) 0% 25%, var(--board-dk) 0% 50%);
  background-size: 36px 36px;
}
.board-wrap iframe {
  position: absolute; inset: 0; width: 100%; height: 100%;
  border: none; display: block;
}

/* ---- TACTICS CATEGORY CARD ---- */
.tactic-card {
  background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--r-md); padding: 28px;
  transition: all .15s; display: flex; flex-direction: column; gap: 8px;
}
.tactic-card:hover { border-color: var(--clay); box-shadow: 0 4px 20px rgba(0,0,0,.07); transform: translateY(-2px); }
.tactic-card h4 { font-size: 19px; }
.tactic-card p { font-size: 14px; line-height: 1.55; flex: 1; }
.tactic-card a {
  font-family: 'Space Mono', monospace; font-size: 11px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--clay); margin-top: 10px;
  transition: gap .12s;
}
.tactic-card a:hover { text-decoration: underline; text-underline-offset: 3px; }

/* ---- PRICING CARDS ---- */
.price-card {
  border: 1px solid var(--line); border-radius: var(--r-lg); padding: 40px;
  background: var(--paper); display: flex; flex-direction: column;
}
.price-card.featured { background: var(--ink); border-color: var(--ink); }
.price-card.featured h3, .price-card.featured .price-desc { color: rgba(255,255,255,.6); }
.price-card.featured h2 { color: #fff; }
.price-card.featured .price-amount { color: #fff; }
.price-card.featured .check-item { color: rgba(244,242,236,.75); }
.price-amount {
  font-size: 52px; font-weight: 700; letter-spacing: -.04em;
  color: var(--ink); margin: 20px 0 6px; line-height: 1;
}
.price-period { font-size: 15px; color: var(--muted); font-weight: 400; }
.check-list { margin: 28px 0; display: flex; flex-direction: column; gap: 12px; }
.check-item { font-size: 15px; color: var(--ink-soft); display: flex; gap: 10px; align-items: flex-start; }
.check-item::before { content: '✓'; color: var(--clay); font-weight: 700; flex-shrink: 0; margin-top: 1px; }
.price-card .enroll-btn { margin-top: auto; width: 100%; justify-content: center; }

/* ---- ENROLLMENT MODAL ---- */
body.modal-open { overflow: hidden; }
.modal-backdrop {
  position: fixed; inset: 0; z-index: 200;
  display: flex; align-items: center; justify-content: center;
  width: 100vw; height: 100vh; padding: 24px;
  background: rgba(26,25,21,.58);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
}
.modal-backdrop[hidden] { display: none; }
.modal-card {
  position: relative; width: min(100%, 460px);
  max-height: calc(100vh - 48px); overflow-y: auto;
  background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--r-xl); padding: 42px;
  box-shadow: 0 24px 90px rgba(0,0,0,.28);
}
.modal-card h2 { font-size: 30px; margin-bottom: 8px; }
.modal-sub { font-size: 15px; line-height: 1.65; margin-bottom: 26px; }
.modal-close {
  position: absolute; top: 16px; right: 16px;
  width: 36px; height: 36px; border-radius: 50%;
  border: 1px solid var(--line); background: var(--bg);
  color: var(--ink); font-size: 24px; line-height: 1;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
}
.modal-close:hover { background: var(--ink); color: #fff; }
.form-status {
  min-height: 20px; margin-top: 14px; text-align: center;
  font-family: 'Space Mono', monospace; font-size: 12px; color: var(--muted);
}
.form-status.success { color: #2f7a4f; }
.form-status.error { color: var(--clay-deep); }

/* ---- SIGN-IN FORM ---- */
.auth-wrap {
  min-height: calc(100vh - 68px); display: flex; align-items: center; justify-content: center;
  background: var(--bg); padding: 60px 20px;
}
.auth-card {
  width: 100%; max-width: 420px; background: var(--paper);
  border: 1px solid var(--line); border-radius: var(--r-xl);
  padding: 48px 44px; box-shadow: 0 8px 48px rgba(0,0,0,.07);
}
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; color: var(--ink); margin-bottom: 7px; }
.form-group input {
  width: 100%; padding: 12px 16px; border: 1.5px solid var(--line);
  border-radius: var(--r-md); font-family: 'Space Grotesk', sans-serif;
  font-size: 16px; color: var(--ink); background: var(--paper);
  transition: border-color .14s; outline: none;
}
.form-group input:focus { border-color: var(--clay); }
.divider { display: flex; align-items: center; gap: 14px; margin: 22px 0; color: var(--muted); font-size: 13px; }
.divider::before, .divider::after { content: ''; flex: 1; height: 1px; background: var(--line); }
.btn-google { width: 100%; justify-content: center; background: #fff; border: 1.5px solid var(--line); color: var(--ink); font-size: 15px; }
.btn-google:hover { background: var(--bg); }

/* ---- BASICS page ---- */
.lesson-card {
  background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--r-lg); padding: 32px 36px;
}
.piece-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; margin-top: 24px; }
.piece-item {
  background: var(--bg); border-radius: var(--r-md); padding: 20px 12px;
  text-align: center; border: 1px solid var(--line);
}
.piece-symbol { font-size: 58px; line-height: 1; margin-bottom: 12px; }
.piece-name { font-family: 'Space Mono', monospace; font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.piece-value { font-weight: 700; font-size: 15px; color: var(--clay); margin-top: 4px; }
.rule-card {
  position: relative; display: block; min-height: 230px;
  transition: transform .15s ease, border-color .15s ease, box-shadow .15s ease;
}
.rule-card:hover {
  border-color: var(--clay); transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0,0,0,.075);
}
.rule-card h4 { font-size: 20px; margin-bottom: 10px; padding-right: 34px; }
.rule-card p { font-size: 15px; line-height: 1.65; }
.rule-arrow {
  position: absolute; top: 28px; right: 28px;
  width: 32px; height: 32px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg); color: var(--clay); font-size: 18px;
  transition: transform .15s ease, background .15s ease, color .15s ease;
}
.rule-card:hover .rule-arrow { transform: translateX(3px); background: var(--clay); color: #fff; }
.lesson-article { padding: 82px 0; }
.lesson-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(340px, 440px); gap: 56px; align-items: start; }
.lesson-content h2 { font-size: 34px; margin: 42px 0 14px; }
.lesson-content h2:first-child { margin-top: 0; }
.lesson-content p { font-size: 17px; line-height: 1.78; margin-bottom: 18px; }
.lesson-content ul { list-style: disc; padding-left: 22px; margin: 0 0 28px; color: var(--ink-soft); }
.lesson-content li { margin-bottom: 10px; line-height: 1.65; }
.lesson-board {
  position: sticky; top: 92px; background: transparent;
  border: none; border-radius: 0; overflow: hidden; box-shadow: none;
}
.inline-board {
  position: static; width: min(100%, 440px);
  margin: 28px 0 38px;
}
.chess-diagram {
  width: min(100%, 440px); aspect-ratio: 1 / 1;
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  grid-template-rows: repeat(8, minmax(0, 1fr));
  border: 1px solid rgba(26,25,21,.16);
  background: var(--board-dk);
}
.diagram-square {
  position: relative; display: flex; align-items: center; justify-content: center;
  min-width: 0; min-height: 0;
}
.chess-diagram { position: relative; }
.diagram-square.light { background: var(--board-lt); }
.diagram-square.dark { background: var(--board-dk); }
.diagram-piece {
  width: 92%; height: 92%; object-fit: contain;
  max-width: none; pointer-events: none;
}
.diagram-rank,
.diagram-file {
  position: absolute; font-family: 'Space Mono', monospace;
  font-size: 13px; font-weight: 700; color: rgba(26,25,21,.56);
  pointer-events: none;
}
.diagram-rank { top: 3px; right: 6px; }
.diagram-file { left: 6px; bottom: 1px; }
.diagram-controls {
  width: min(100%, 440px); display: grid; grid-template-columns: 1fr auto 1fr;
  align-items: center; margin-top: 10px; background: var(--ink);
}
.diagram-control {
  height: 56px; border: 0; background: var(--ink); color: rgba(255,255,255,.76);
  font-size: 32px; cursor: pointer; transition: background .12s ease, color .12s ease;
}
.diagram-control:hover:not(:disabled) { background: var(--clay); color: #fff; }
.diagram-control:disabled { color: rgba(255,255,255,.22); cursor: default; }
.diagram-count {
  min-width: 64px; text-align: center; font-family: 'Space Mono', monospace;
  font-size: 12px; color: rgba(255,255,255,.45);
}
.diagram-arrow-layer {
  position: absolute; inset: 0; width: 100%; height: 100%;
  pointer-events: none; z-index: 2;
}
.diagram-arrow {
  stroke: rgba(217,119,87,.88); stroke-width: 2.2;
  stroke-linecap: round;
}
.diagram-arrow-head { fill: rgba(217,119,87,.88); }
.movement-article .container-sm { max-width: 760px; }
.lesson-note {
  margin-top: 34px; padding: 26px 30px;
  background: var(--cream); border: 1px solid var(--line);
  border-radius: var(--r-lg);
}
.lesson-note h3 { font-size: 20px; margin-bottom: 8px; }
.lesson-nav {
  display: flex; gap: 14px; justify-content: space-between;
  margin-top: 48px; flex-wrap: wrap;
}
.principle-item { display: flex; gap: 20px; padding: 28px 0; border-bottom: 1px solid var(--line); }
.principle-item:last-child { border-bottom: none; }
.principle-num { font-family: 'Space Mono', monospace; font-size: 26px; font-weight: 700; color: var(--clay); flex-shrink: 0; min-width: 40px; }
.principle-title { font-size: 19px; font-weight: 600; margin-bottom: 6px; }
.principle-desc { font-size: 15px; color: var(--ink-soft); line-height: 1.65; }

/* ---- OPENING CARD ---- */
.opening-card {
  background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--r-lg); overflow: hidden;
}
.opening-header { padding: 24px 28px; border-bottom: 1px solid var(--line); }
.opening-header h4 { font-size: 19px; margin-bottom: 5px; }
.opening-header p { font-size: 14px; color: var(--muted); }
.opening-board { height: 280px; }
.opening-board .board-wrap { border-radius: 0; border: none; min-height: 280px; }
.opening-board .board-wrap iframe { position: absolute; inset: 0; width: 100%; height: 100%; }

/* Section backgrounds */
.bg-cream { background: var(--cream); }
.bg-ink   { background: var(--ink); }
.bg-bg    { background: var(--bg); }

/* ---- FOOTER ---- */
footer { background: var(--ink); color: var(--cream); padding: 72px 0 40px; }
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px; margin-bottom: 52px;
}
footer h4 {
  font-family: 'Space Mono', monospace; font-size: 11px;
  letter-spacing: .2em; text-transform: uppercase;
  color: rgba(255,255,255,.88); margin-bottom: 18px;
}
footer li a {
  display: block; font-size: 15px; color: rgba(244,242,236,.46);
  margin-bottom: 10px; transition: color .12s;
}
footer li a:hover { color: var(--cream); }
.footer-logo-row {
  display: flex; align-items: center; gap: 10px;
  font-size: 17px; font-weight: 700; letter-spacing: -.02em;
  color: #fff; margin-bottom: 14px;
}
.footer-logo-row img { width: 28px; height: 28px; filter: brightness(0) invert(1); }
.footer-tagline { font-size: 14px; color: rgba(244,242,236,.38); line-height: 1.75; max-width: 240px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08); padding-top: 28px;
  display: flex; justify-content: space-between; align-items: center;
  font-family: 'Space Mono', monospace; font-size: 12px;
  color: rgba(244,242,236,.26);
}
.badge-soon {
  font-family: 'Space Mono', monospace; font-size: 10px; letter-spacing: .08em;
  text-transform: uppercase; background: rgba(217,119,87,.18);
  color: var(--clay); padding: 3px 8px; border-radius: 999px; margin-left: 5px;
}

/* ---- RESPONSIVE ---- */
@media (max-width: 960px) {
  .hero-inner, .grid-split, .grid-2 { grid-template-columns: 1fr; }
  .hero-badge { width: 240px; height: 240px; }
  .hero h1 { font-size: 50px; }
  .grid-4, .grid-3 { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .nav-links { display: none; }
  .container, .container-sm { padding: 0 20px; }
  .section { padding: 60px 0; }
  .hero { padding: 72px 0; }
  .piece-grid { grid-template-columns: repeat(3, 1fr); }
  .lesson-layout { grid-template-columns: 1fr; }
  .lesson-board { position: static; }
}
@media (max-width: 580px) {
  .hero h1 { font-size: 38px; }
  .hero-badge { display: none; }
  .grid-4, .grid-3 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .auth-card { padding: 32px 24px; }
  .modal-backdrop { align-items: flex-end; padding: 14px; }
  .modal-card { border-radius: var(--r-lg); padding: 34px 24px 24px; }
  .piece-grid { grid-template-columns: repeat(3, 1fr); }
  .piece-symbol { font-size: 48px; }
  .lesson-content h2 { font-size: 28px; }
  .lesson-article { padding: 56px 0; }
}