/* ════════════════════════════════════════════════════════════
   Decatur Chess — Bold & Modern Stylesheet
   Pure black · Electric cyan · Sharp geometry · No mercy
   ════════════════════════════════════════════════════════════ */

:root {
  --black:     #080808;
  --deep:      #111111;
  --panel:     #171717;
  --border:    #2A2A2A;
  --white:     #F2F2F2;
  --dim:       #888888;
  --cyan:      #00E5FF;
  --cyan-dim:  rgba(0,229,255,.1);
  --cyan-glow: rgba(0,229,255,.35);
  --shadow:    0 4px 32px rgba(0,0,0,.6);
  --shadow-lg: 0 16px 64px rgba(0,0,0,.8);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'DM Sans', sans-serif;
  background: var(--black);
  color: var(--white);
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
img { display: block; max-width: 100%; }

/* grid texture */
.grid-overlay {
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    linear-gradient(rgba(0,229,255,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,229,255,.025) 1px, transparent 1px);
  background-size: 64px 64px;
}

/* ── HEADER ─────────────────────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(8,8,8,.94);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 32px;
}
.logo-wrap { display: flex; align-items: center; gap: 12px; }
.logo-crown { font-size: 1.5rem; filter: drop-shadow(0 0 8px var(--cyan)); }
.logo-text  { display: flex; flex-direction: column; line-height: 1.1; }
.logo-main  {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 1.4rem; letter-spacing: 4px; color: var(--white);
}
.logo-main .accent { color: var(--cyan); }
.logo-sub { font-size: .6rem; letter-spacing: 4px; text-transform: uppercase; color: var(--dim); }

.main-nav { display: flex; gap: 2px; }
.main-nav a {
  font-size: .72rem; font-weight: 500; letter-spacing: 2px; text-transform: uppercase;
  padding: 8px 16px; color: var(--dim); position: relative; transition: color .2s;
}
.main-nav a::after {
  content: ''; position: absolute; bottom: 0; left: 16px; right: 16px;
  height: 1px; background: var(--cyan); transform: scaleX(0); transition: transform .2s;
}
.main-nav a:hover { color: var(--white); }
.main-nav a:hover::after { transform: scaleX(1); }

.hamburger {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.hamburger span { display: block; width: 22px; height: 1.5px; background: var(--white); transition: .3s; }

/* ── HERO ───────────────────────────────────────────────── */
.hero {
  position: relative; overflow: hidden;
  min-height: 100vh; display: flex; align-items: flex-start;
  background: var(--black);
}
.hero-checkers {
  position: absolute; inset: 0; z-index: 0;
  background-image: repeating-conic-gradient(#141414 0% 25%, #0c0c0c 0% 50%);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse 75% 90% at 68% 50%, black 10%, transparent 75%);
}
.hero-glow {
  position: absolute; top: 50%; left: -150px; transform: translateY(-50%);
  width: 500px; height: 500px; border-radius: 50%; z-index: 1;
  background: radial-gradient(circle, rgba(0,229,255,.07) 0%, transparent 65%);
  animation: breathe 6s ease-in-out infinite alternate;
}
@keyframes breathe {
  from { transform: translateY(-50%) scale(1);   opacity: .5; }
  to   { transform: translateY(-50%) scale(1.2); opacity: 1; }
}
.hero-inner {
  position: relative; z-index: 2;
  max-width: 1200px; margin: 0 auto; padding: 36px 32px 80px;
  display: grid; grid-template-columns: 1.45fr 1fr; gap: 60px; align-items: center;
}
.hero-text { animation: slideIn .85s cubic-bezier(.16,1,.3,1) both; }
@keyframes slideIn {
  from { opacity: 0; transform: translateX(-36px); }
  to   { opacity: 1; transform: translateX(0); }
}
.hero-kicker { display: inline-flex; align-items: center; gap: 10px; margin-bottom: 28px; }
.hero-kicker-dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan); animation: blink 2s ease-in-out infinite;
}
@keyframes blink { 0%,100% { opacity: 1; } 50% { opacity: .2; } }
.hero-kicker span { font-size: .65rem; letter-spacing: 4px; text-transform: uppercase; color: var(--cyan); }

.hero h1 {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(3.8rem, 8vw, 7rem);
  line-height: .93; letter-spacing: 2px; color: var(--white);
  margin-bottom: 28px;
}
.hero h1 .line-cyan   { display: block; color: var(--cyan); text-shadow: 0 0 40px var(--cyan-glow); }
.hero h1 .line-ghost  { display: block; -webkit-text-stroke: 1px rgba(242,242,242,.25); color: transparent; }

.hero-sub {
  font-size: .97rem; color: var(--dim); line-height: 1.85;
  max-width: 420px; margin-bottom: 40px;
  border-left: 2px solid var(--cyan); padding-left: 18px;
}
.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; }

/* ── BUTTONS ────────────────────────────────────────────── */
.btn {
  display: inline-block;
  font-family: 'DM Sans', sans-serif; font-size: .7rem; font-weight: 700;
  letter-spacing: 3px; text-transform: uppercase;
  padding: 16px 36px; transition: all .2s; cursor: pointer; border: none;
}
.btn-primary, a.btn-primary  { background: var(--cyan); color: var(--black) !important; box-shadow: 0 0 24px var(--cyan-glow); text-decoration: none !important; }
.btn-primary:hover, a.btn-primary:hover  { background: #fff; color: var(--black) !important; box-shadow: 0 0 40px var(--cyan-glow); transform: translateY(-2px); }
.btn-secondary, a.btn-secondary { background: transparent; color: var(--white) !important; border: 1px solid var(--border); text-decoration: none !important; }
.btn-secondary:hover, a.btn-secondary:hover { border-color: var(--cyan); color: var(--cyan) !important; transform: translateY(-2px); }

/* ── HERO VISUAL ────────────────────────────────────────── */
.hero-visual {
  animation: slideIn .85s .15s cubic-bezier(.16,1,.3,1) both; position: relative;
}
.hero-img-frame { position: relative; }
.hero-img-frame::before {
  content: ''; position: absolute; top: -8px; left: -8px; right: 8px; bottom: 8px;
  border: 1px solid var(--cyan); z-index: 0; opacity: .35;
}
.hero-board-img { position: relative; z-index: 1; width: 100%; object-fit: cover; filter: grayscale(15%) contrast(1.1); }
.hero-tag {
  position: absolute; z-index: 2; bottom: -14px; right: -14px;
  background: var(--cyan); color: var(--black); padding: 14px 20px;
  font-family: 'Bebas Neue', sans-serif; font-size: 1.1rem; letter-spacing: 2px; line-height: 1.1;
}
.hero-tag small {
  display: block; font-family: 'DM Sans', sans-serif;
  font-size: .58rem; letter-spacing: 3px; text-transform: uppercase; font-weight: 700; margin-bottom: 3px;
}

/* ── NOTICE BAR ─────────────────────────────────────────── */
.notice-bar { background: var(--panel); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); padding: 18px 32px; }
.notice-bar-inner { max-width: 1200px; margin: 0 auto; display: flex; align-items: flex-start; gap: 14px; }
.notice-icon { font-size: 1rem; flex-shrink: 0; margin-top: 3px; }
.notice-bar p { font-size: .8rem; color: var(--dim); line-height: 1.7; }
.notice-bar strong { color: var(--white); }

/* ── SECTION SHARED ─────────────────────────────────────── */
section { padding: 100px 32px; }
.section-inner { max-width: 1200px; margin: 0 auto; }
.section-kicker { display: inline-flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.section-kicker-line { width: 24px; height: 1px; background: var(--cyan); }
.section-kicker span { font-size: .65rem; letter-spacing: 4px; text-transform: uppercase; color: var(--cyan); }
.section-title {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(2.4rem, 4vw, 3.6rem);
  letter-spacing: 2px; line-height: 1; margin-bottom: 16px;
}
.section-desc { font-size: .93rem; color: var(--dim); max-width: 520px; line-height: 1.85; }

/* ── LESSONS ────────────────────────────────────────────── */
#lessons { background: var(--deep); }
.lessons-header { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 52px; flex-wrap: wrap; gap: 24px; }
.lessons-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1px; background: var(--border); }
.lesson-card {
  background: var(--panel); padding: 40px 32px;
  transition: background .25s; position: relative; overflow: hidden;
}
.lesson-card::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, var(--cyan-dim), transparent 60%);
  opacity: 0; transition: opacity .3s;
}
.lesson-card:hover { background: #1c1c1c; }
.lesson-card:hover::after { opacity: 1; }
.lesson-num {
  font-family: 'Bebas Neue', sans-serif; font-size: 4rem; line-height: 1;
  color: var(--border); margin-bottom: 16px; display: block; transition: color .3s;
}
.lesson-card:hover .lesson-num { color: rgba(0,229,255,.15); }
.lesson-card h3 { font-family: 'Bebas Neue', sans-serif; font-size: 1.5rem; letter-spacing: 2px; color: var(--white); margin-bottom: 12px; }
.lesson-card p { font-size: .87rem; color: var(--dim); line-height: 1.75; margin-bottom: 24px; }
.lesson-price { font-family: 'Bebas Neue', sans-serif; font-size: 2.2rem; color: var(--cyan); letter-spacing: 1px; line-height: 1; }
.lesson-price-unit { font-family: 'DM Sans', sans-serif; font-size: .68rem; letter-spacing: 2px; text-transform: uppercase; color: var(--dim); margin-top: 4px; }
.lesson-note { font-size: .73rem; color: var(--border); margin-top: 12px; border-top: 1px solid var(--border); padding-top: 12px; transition: color .3s; letter-spacing: .5px; }
.lesson-card:hover .lesson-note { color: var(--dim); }

/* ── ABOUT ──────────────────────────────────────────────── */
#about { background: var(--black); }
.about-grid { display: grid; grid-template-columns: 1fr 1.5fr; gap: 80px; align-items: start; margin-top: 60px; }
.about-img-wrap { position: relative; }
.about-img { width: 100%; object-fit: cover; filter: grayscale(25%); border: 1px solid var(--border); }
.about-rating-badge {
  position: absolute; top: -16px; right: -16px;
  background: var(--cyan); color: var(--black);
  width: 80px; height: 80px; display: flex; flex-direction: column;
  align-items: center; justify-content: center; text-align: center;
}
.about-rating-badge .r-num { font-family: 'Bebas Neue', sans-serif; font-size: 1.6rem; line-height: 1; }
.about-rating-badge .r-label { font-size: .5rem; letter-spacing: 1.5px; text-transform: uppercase; font-weight: 700; }
.about-points { list-style: none; margin: 28px 0; }
.about-points li {
  display: flex; gap: 14px; align-items: flex-start;
  font-size: .88rem; color: var(--dim); line-height: 1.75;
  padding: 14px 0; border-bottom: 1px solid var(--border);
}
.about-points li:first-child { border-top: 1px solid var(--border); }
.about-points li::before { content: '♟'; color: var(--cyan); flex-shrink: 0; }
.about-disclaimer { background: var(--panel); border-left: 2px solid var(--dim); padding: 16px 20px; margin-top: 8px; }
.about-disclaimer p { font-size: .8rem; color: var(--dim); line-height: 1.75; font-style: italic; }

/* ── CASUAL PLAY ────────────────────────────────────────── */
#casual { background: var(--deep); }
.casual-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 80px; align-items: center; margin-top: 60px; }
.casual-features { display: flex; flex-direction: column; margin-top: 36px; }
.casual-feature {
  display: flex; gap: 20px; align-items: flex-start;
  padding: 20px 0; border-bottom: 1px solid var(--border);
}
.casual-feature:first-child { border-top: 1px solid var(--border); }
.casual-feature-num { font-family: 'Bebas Neue', sans-serif; font-size: 1.2rem; color: var(--cyan); flex-shrink: 0; line-height: 1.5; }
.casual-feature h4 { font-size: .82rem; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 6px; color: var(--white); }
.casual-feature p { font-size: .85rem; color: var(--dim); line-height: 1.75; }
.casual-img-wrap { position: relative; }
.casual-img { width: 100%; object-fit: cover; filter: grayscale(20%); border: 1px solid var(--border); }
.casual-img-label {
  position: absolute; bottom: 0; left: 0; right: 0;
  background: linear-gradient(transparent, rgba(8,8,8,.9));
  padding: 48px 20px 16px;
  font-family: 'Bebas Neue', sans-serif; font-size: 1rem; letter-spacing: 3px; color: var(--cyan);
}

/* ── CONTACT ────────────────────────────────────────────── */
#contact { background: var(--black); }
.contact-grid { display: grid; grid-template-columns: 1fr 1.4fr; gap: 80px; align-items: start; margin-top: 60px; }
.contact-info { display: flex; flex-direction: column; }
.contact-item { display: flex; gap: 16px; align-items: flex-start; padding: 20px 0; border-bottom: 1px solid var(--border); }
.contact-item:first-child { border-top: 1px solid var(--border); }
.contact-item-icon { font-size: 1rem; color: var(--cyan); flex-shrink: 0; width: 20px; text-align: center; margin-top: 2px; }
.contact-item-text strong { display: block; font-size: .63rem; letter-spacing: 3px; text-transform: uppercase; color: var(--cyan); margin-bottom: 6px; }
.contact-item-text p { font-size: .87rem; color: var(--dim); line-height: 1.75; }

.contact-form { display: flex; flex-direction: column; gap: 18px; }
.contact-form h3 { font-family: 'Bebas Neue', sans-serif; font-size: 1.8rem; letter-spacing: 2px; margin-bottom: 4px; }
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-group label { font-size: .62rem; letter-spacing: 3px; text-transform: uppercase; color: var(--cyan); }
.form-group input, .form-group select, .form-group textarea {
  background: var(--panel); border: 1px solid var(--border); border-radius: 0;
  padding: 13px 16px; font-family: 'DM Sans', sans-serif; font-size: .9rem;
  color: var(--white); outline: none; width: 100%; transition: border-color .2s; -webkit-appearance: none;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--cyan); }
.form-group select option { background: var(--panel); }
.form-group textarea { resize: vertical; min-height: 120px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

/* ── FOOTER ─────────────────────────────────────────────── */
.site-footer { background: var(--deep); border-top: 1px solid var(--border); padding: 64px 32px 0; }
.footer-inner {
  max-width: 1200px; margin: 0 auto;
  display: grid; grid-template-columns: 2fr 1fr 1.5fr; gap: 64px;
  padding-bottom: 48px; border-bottom: 1px solid var(--border);
}
.footer-logo-name { font-family: 'Bebas Neue', sans-serif; font-size: 1.6rem; letter-spacing: 4px; color: var(--white); display: block; margin-bottom: 12px; }
.footer-logo-name .accent { color: var(--cyan); }
.footer-brand p { font-size: .82rem; color: var(--dim); line-height: 1.8; max-width: 260px; }
.footer-links h4, .footer-contact h4 { font-size: .63rem; letter-spacing: 3px; text-transform: uppercase; color: var(--cyan); margin-bottom: 20px; }
.footer-links a { display: block; color: var(--dim); font-size: .83rem; padding: 5px 0; transition: color .2s; }
.footer-links a:hover { color: var(--white); }
.footer-contact p { font-size: .83rem; color: var(--dim); line-height: 1.8; margin-bottom: 6px; }
.footer-bottom {
  max-width: 1200px; margin: 0 auto; padding: 20px 0;
  display: flex; justify-content: space-between; align-items: center;
  font-size: .7rem; color: #2e2e2e; letter-spacing: 1px;
}

/* ── RESPONSIVE ─────────────────────────────────────────── */
@media (max-width: 900px) {
  .hero-inner, .about-grid, .casual-grid, .contact-grid { grid-template-columns: 1fr; gap: 48px; }
  .footer-inner { grid-template-columns: 1fr; gap: 40px; }
  .form-row { grid-template-columns: 1fr; }
  .hero-tag { right: 0; bottom: 0; }
  .about-rating-badge { top: 0; right: 0; }
  .casual-img-wrap { order: -1; }
  .main-nav {
    display: none; flex-direction: column;
    position: absolute; top: 68px; left: 0; right: 0;
    background: var(--deep); padding: 16px 32px;
    border-bottom: 1px solid var(--border); z-index: 99;
  }
  .main-nav.open { display: flex; }
  .hamburger { display: flex; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
}