/* ==========================================================================
   IchessU INC — design tokens
   ========================================================================== */
:root{
  --color-bg:        #FAF9F6;
  --color-bg-alt:     #F2F0E9;
  --color-ink:        #16213A;
  --color-ink-soft:   #4A5568;
  --color-gold:       #C89B3C;
  --color-gold-dark:  #A87F2C;
  --color-teal:       #2F8F82;
  --color-line:       #E1DED2;
  --color-card:       #FFFFFF;

  --font-display: "Bitter", Georgia, serif;
  --font-body:    "Manrope", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --max-width: 1140px;
  --radius: 4px;
}

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

html{ scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *, *::before, *::after{ animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

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

h1, h2, h3{
  font-family: var(--font-display);
  color: var(--color-ink);
  line-height: 1.15;
  margin: 0 0 0.5em;
  font-weight: 600;
}

h1{ font-size: clamp(2.1rem, 4vw, 3.4rem); font-weight: 700; letter-spacing: -0.01em; }
h2{ font-size: clamp(1.6rem, 2.6vw, 2.2rem); }
h3{ font-size: 1.15rem; }

p{ margin: 0 0 1em; color: var(--color-ink-soft); max-width: 62ch; }

a{ color: var(--color-ink); }

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

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

.skip-link{
  position:absolute; left:-999px; top:auto;
  background: var(--color-ink); color:#fff; padding: 10px 16px; z-index: 100;
}
.skip-link:focus{ left: 16px; top: 16px; }

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

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn{
  display:inline-block;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.95rem;
  padding: 13px 26px;
  border-radius: var(--radius);
  text-decoration: none;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.btn-primary{
  background: var(--color-ink);
  color: #fff;
}
.btn-primary:hover{ background: var(--color-gold-dark); }
.btn-ghost{
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-line);
}
.btn-ghost:hover{ border-color: var(--color-ink); }

/* ==========================================================================
   Header
   ========================================================================== */
.site-header{
  position: sticky; top: 0; z-index: 50;
  background: rgba(250,249,246,0.92);
  backdrop-filter: saturate(140%) blur(6px);
  border-bottom: 1px solid var(--color-line);
}
.header-inner{
  display:flex; align-items:center; gap: 32px;
  padding-top: 14px; padding-bottom: 14px;
  position: relative;
}
.logo{
  display:flex; align-items:center; gap: 10px;
  text-decoration:none; margin-right: auto;
}
.logo-word{
  font-family: var(--font-display);
  font-weight: 700; font-size: 1.15rem; color: var(--color-ink);
}
.logo-suffix{
  font-family: var(--font-body);
  font-weight: 700; font-size: 0.62rem;
  color: var(--color-ink-soft);
  margin-left: 6px; vertical-align: middle;
  letter-spacing: 0.04em;
}
.nav-panel{ display:flex; align-items:center; gap: 28px; }
.main-nav{ display:flex; gap: 28px; }
.main-nav a{
  text-decoration:none; color: var(--color-ink-soft);
  font-weight: 600; font-size: 0.95rem;
}
.main-nav a:hover{ color: var(--color-ink); }

.header-cta{ padding: 10px 20px; font-size: 0.9rem; }

.nav-toggle{
  display:none; flex-direction:column; justify-content:center; gap: 5px;
  width: 40px; height: 40px; background:none; border: none; cursor:pointer;
}
.nav-toggle span{ display:block; width: 22px; height: 2px; background: var(--color-ink); }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero{ padding: 72px 0 88px; }
.hero-inner{
  display:grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 56px;
  align-items:center;
}
.hero-lede{ font-size: 1.1rem; max-width: 46ch; }
.hero-actions{ display:flex; gap: 14px; margin-top: 28px; flex-wrap: wrap; }

.hero-board{ display:flex; justify-content:center; }
.board-grid{
  display:grid;
  grid-template-columns: repeat(8, 1fr);
  width: min(360px, 100%);
  aspect-ratio: 1 / 1;
  border: 1px solid var(--color-line);
}
.sq{ background: var(--color-bg-alt); }
.sq:nth-child(16n+1), .sq:nth-child(16n+3), .sq:nth-child(16n+5), .sq:nth-child(16n+7),
.sq:nth-child(16n+10), .sq:nth-child(16n+12), .sq:nth-child(16n+14), .sq:nth-child(16n+16){
  background: var(--color-card);
}
.sq.gold{ background: var(--color-gold); }
.sq.teal{ background: var(--color-teal); }
.sq.mark{ background: var(--color-ink); }

/* ==========================================================================
   Photo frames (kept for future use if real photos are added later)
   ========================================================================== */
.photo-frame{
  position: relative;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-line);
  overflow: hidden;
  margin: 0;
}
.photo-frame img{ width:100%; height:100%; object-fit: cover; display:block; }
.img-fallback{
  position: absolute; inset: 0;
  display:flex; align-items:center; justify-content:center;
  text-align:center; padding: 24px;
  font-size: 0.85rem; color: var(--color-ink-soft);
  background:
    repeating-linear-gradient(45deg, var(--color-bg-alt), var(--color-bg-alt) 10px, var(--color-bg) 10px, var(--color-bg) 20px);
}
.img-fallback code{
  background: var(--color-card); border: 1px solid var(--color-line);
  padding: 1px 6px; border-radius: 3px; font-size: 0.82em;
}

/* ==========================================================================
   Icon badges (square, matching the checkerboard motif)
   ========================================================================== */
.icon-badge{
  --badge-color: var(--color-ink);
  display:inline-flex; align-items:center; justify-content:center;
  width: 52px; height: 52px;
  border: 1.5px solid var(--color-line);
  color: var(--badge-color);
  margin-bottom: 18px;
}
.icon-badge svg{ width: 26px; height: 26px; }

/* ==========================================================================
   Section head
   ========================================================================== */
.section-head{ max-width: 640px; margin-bottom: 44px; }
section{ padding: 88px 0; }
section + section{ border-top: 1px solid var(--color-line); }

/* ==========================================================================
   Who we serve
   ========================================================================== */
.who-grid{
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--color-line);
  border: 1px solid var(--color-line);
}
.who-card{ background: var(--color-card); padding: 32px 28px; }
.who-card p{ font-size: 0.95rem; max-width: 34ch; }
.who-card ul{ margin: 14px 0 0; padding: 0; list-style: none; }
.who-card li{
  color: var(--color-ink-soft); font-size: 0.88rem;
  padding-left: 16px; position: relative; margin-bottom: 6px;
}
.who-card li::before{
  content: ""; position:absolute; left:0; top: 0.55em;
  width: 6px; height: 6px; background: var(--color-gold);
}

/* ==========================================================================
   Services
   ========================================================================== */
.service-grid{
  display:grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--color-line);
  border: 1px solid var(--color-line);
}
.service-card{
  background: var(--color-card);
  padding: 36px;
}
.service-card p{ max-width: 42ch; }

/* ==========================================================================
   Approach (staged process)
   ========================================================================== */
.stage-list{
  list-style:none; margin:0; padding:0;
  display:grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
  background: var(--color-line); border: 1px solid var(--color-line);
}
.stage{ background: var(--color-card); padding: 32px; }
.stage-head{ display:flex; gap: 16px; align-items:flex-start; margin-bottom: 18px; }
.stage-num{
  flex: none;
  display:flex; align-items:center; justify-content:center;
  width: 34px; height: 34px;
  border: 1.5px solid var(--color-line);
  font-family: var(--font-display); font-weight: 700; font-size: 0.95rem;
  color: var(--color-gold-dark);
}
.stage-head h3{ margin-bottom: 4px; }
.stage-sub{ margin:0; font-size: 0.88rem; color: var(--color-ink-soft); }
.stage ul{ margin:0; padding-left: 18px; }
.stage li{ color: var(--color-ink-soft); font-size: 0.92rem; margin-bottom: 6px; }

/* ==========================================================================
   Why IchessU
   ========================================================================== */
.why{ background: var(--color-ink); color: #E7E5DD; }
.why .section-head h2{ color: #fff; }
.why-grid{
  display:grid; grid-template-columns: repeat(4, 1fr); gap: 32px;
}
.why-item h3{ color: #fff; font-size: 1.05rem; }
.why-item p{ color: #B7B4A8; max-width: 32ch; }

/* ==========================================================================
   App showcase
   ========================================================================== */
.app-showcase-inner{
  display:grid; grid-template-columns: 1.2fr 0.8fr; gap: 56px; align-items:center;
}
.app-copy p{ max-width: 46ch; }
.phone-showcase{ display:flex; flex-direction:column; align-items:center; gap: 14px; }
.phone-frame{
  width: min(230px, 70%);
  border: 10px solid var(--color-ink);
  border-radius: 28px;
  overflow: hidden;
  box-shadow: 0 0 0 1px var(--color-ink);
}
.phone-screen{
  background: var(--color-bg);
  aspect-ratio: 9/19.5;
  padding: 14px 14px 10px;
  display:flex;
  flex-direction:column;
  font-size: 0.7rem;
}
.phone-status{
  display:flex; justify-content:space-between;
  font-weight: 700; color: var(--color-ink); margin-bottom: 14px;
}
.phone-app-header{ margin-bottom: 14px; }
.phone-greeting{ display:block; font-family: var(--font-display); font-weight: 700; font-size: 0.92rem; color: var(--color-ink); }
.phone-streak{ display:block; font-size: 0.68rem; color: var(--color-ink-soft); margin-top: 2px; }
.phone-progress-card{
  background: var(--color-card); border: 1px solid var(--color-line);
  padding: 10px; margin-bottom: 14px;
}
.phone-progress-label{ display:flex; justify-content:space-between; font-weight: 700; color: var(--color-ink); margin-bottom: 8px; }
.phone-progress-bar{ height: 6px; background: var(--color-bg-alt); }
.phone-progress-bar span{ display:block; height:100%; background: var(--color-teal); }
.phone-lesson-list{ list-style:none; margin:0 0 auto; padding:0; flex:1; }
.phone-lesson-list li{
  display:flex; align-items:center; gap: 8px;
  padding: 8px 0; border-bottom: 1px solid var(--color-line);
  color: var(--color-ink-soft);
}
.phone-lesson-list li.done{ color: var(--color-ink); }
.phone-lesson-list li.active{ color: var(--color-ink); font-weight: 700; }
.phone-lesson-icon{
  width: 16px; height: 16px; flex: none;
  border: 1.3px solid var(--color-line);
  display:flex; align-items:center; justify-content:center;
  font-size: 0.62rem; color: var(--color-teal); font-weight: 700;
}
.phone-lesson-list li.done .phone-lesson-icon{ background: var(--color-teal); border-color: var(--color-teal); color: #fff; }
.phone-lesson-list li.active .phone-lesson-icon{ border-color: var(--color-gold); }
.phone-nav{
  display:flex; justify-content:space-around; align-items:center;
  padding-top: 10px; margin-top: 10px; border-top: 1px solid var(--color-line);
}
.phone-nav-item{ width: 8px; height: 8px; background: var(--color-line); border-radius: 50%; }
.phone-nav-item.active{ background: var(--color-ink); }
.phone-caption{ font-size: 0.8rem; color: var(--color-ink-soft); font-style: italic; margin: 0; }

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq-list{ max-width: 780px; }
.faq-item{
  border-bottom: 1px solid var(--color-line);
  padding: 18px 0;
}
.faq-item summary{
  cursor: pointer; font-weight: 700; font-size: 1.02rem;
  list-style: none; position: relative; padding-right: 28px;
}
.faq-item summary::-webkit-details-marker{ display:none; }
.faq-item summary::after{
  content: "+";
  position: absolute; right: 0; top: 0;
  font-family: var(--font-display); font-size: 1.2rem; color: var(--color-gold-dark);
}
.faq-item[open] summary::after{ content: "\2212"; }
.faq-item p{ margin-top: 12px; max-width: 68ch; }

/* ==========================================================================
   Contact
   ========================================================================== */
.contact{ background: var(--color-bg-alt); }
.contact-inner{
  display:grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 64px;
}
.info-block{ margin-top: 26px; }
.info-block h3{ font-size: 0.85rem; text-transform: none; font-weight:700; margin-bottom: 6px; color: var(--color-ink); }
.info-block p{ margin:0; }
.info-block a{ text-decoration: underline; text-decoration-color: var(--color-line); }

.map-frame{
  margin-top: 30px; border: 1px solid var(--color-line);
  aspect-ratio: 4/3; overflow:hidden; background: var(--color-card);
}
.map-frame iframe{ width:100%; height:100%; border:0; }

.contact-form{
  background: var(--color-card);
  border: 1px solid var(--color-line);
  padding: 36px;
}
.form-row{ margin-bottom: 20px; }
.form-row label{
  display:block; font-weight: 700; font-size: 0.88rem; margin-bottom: 8px;
}
.form-row input,
.form-row select,
.form-row textarea{
  width: 100%;
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 12px 14px;
  border: 1.5px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-ink);
}
.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus{
  border-color: var(--color-teal);
  outline: none;
}
.form-row textarea{ resize: vertical; }
.hp-field{ position:absolute; left:-9999px; width:1px; height:1px; opacity:0; }
.form-submit{ width: 100%; }
.form-status{ margin-top: 14px; margin-bottom: 0; font-size: 0.9rem; }
.form-status.success{ color: var(--color-teal); }
.form-status.error{ color: #B3413A; }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer{
  background: #101A2E;
  color: #E7E5DD;
  padding: 56px 0 0;
}
.footer-grid{
  display:grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 40px;
  border-bottom: 1px solid #253150;
}
.footer-brand{
  display:flex; flex-wrap:wrap; align-items:center; gap: 10px;
  font-family: var(--font-display); font-weight: 700; color: #fff;
}
.footer-brand p{
  flex-basis: 100%; margin: 10px 0 0; color: #9CA0AE; font-size: 0.88rem; max-width: 32ch;
}
.footer-col h4{
  color: #fff; font-family: var(--font-body); font-size: 0.85rem;
  font-weight: 700; margin: 0 0 14px;
}
.footer-col a{
  display:block; color: #ABA8A0; text-decoration:none; font-size: 0.92rem; margin-bottom: 10px;
}
.footer-col a:hover{ color: #fff; }
.footer-col p{ color: #ABA8A0; font-size: 0.92rem; margin: 0 0 10px; }
.footer-col p a{ display:inline; margin:0; }
.footer-bottom{ padding: 22px 0; font-size: 0.85rem; color: #7D8091; }
.footer-bottom p{ margin:0; color: inherit; }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 900px){
  .hero-inner{ grid-template-columns: 1fr; }
  .hero-photo{ order: -1; }
  .about-inner{ grid-template-columns: 1fr; }
  .contact-inner{ grid-template-columns: 1fr; }
  .who-grid{ grid-template-columns: repeat(2, 1fr); }
  .service-grid{ grid-template-columns: 1fr; }
  .stage-list{ grid-template-columns: 1fr; }
  .why-grid{ grid-template-columns: repeat(2, 1fr); }
  .app-showcase-inner{ grid-template-columns: 1fr; }
  .phone-showcase{ order: -1; }
  .footer-grid{ grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px){
  .nav-panel{ display:none; }
  .site-header.nav-open .nav-panel{
    display:flex; flex-direction:column; align-items:flex-start; gap: 16px;
    position:absolute; top: 100%; left:0; right:0;
    background: var(--color-bg); border-bottom: 1px solid var(--color-line);
    padding: 18px 24px 24px;
  }
  .site-header.nav-open .main-nav{ flex-direction:column; gap: 14px; }
  .nav-toggle{ display:flex; }
  section{ padding: 60px 0; }
  .hero{ padding: 48px 0 60px; }
}