/* ============================================================
   CoachJSD — Premium Design System
   Aesthetic: Apple simplicity · Airbnb usability · Stripe clarity
   Accent: Cobalt / electric blue
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  --blue-600: #1a56ff;      /* primary cobalt */
  --blue-500: #2f6bff;
  --blue-400: #5a86ff;
  --blue-050: #eef3ff;
  --blue-glow: rgba(26, 86, 255, 0.35);

  --ink: #0a0d14;           /* near-black */
  --charcoal: #171b26;
  --slate: #4a5163;
  --gray: #8b91a1;
  --line: #e8eaf0;
  --mist: #f5f7fb;
  --white: #ffffff;

  --radius-sm: 12px;
  --radius: 18px;
  --radius-lg: 28px;
  --radius-xl: 40px;

  --shadow-sm: 0 2px 8px rgba(16, 24, 40, 0.06);
  --shadow: 0 12px 40px rgba(16, 24, 40, 0.10);
  --shadow-lg: 0 30px 80px rgba(16, 24, 40, 0.16);
  --shadow-blue: 0 18px 50px rgba(26, 86, 255, 0.30);

  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --display: "Sora", "Inter", -apple-system, BlinkMacSystemFont, sans-serif;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --maxw: 1200px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul { list-style: none; }
::selection { background: var(--blue-600); color: #fff; }

/* ---------- Layout ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { padding: 120px 0; }
.section-sm { padding: 80px 0; }
.center { text-align: center; }

/* ---------- Typography ---------- */
h1, h2, h3, h4 { font-family: var(--display); font-weight: 700; letter-spacing: -0.03em; line-height: 1.05; color: var(--ink); }
.display { font-size: clamp(2.6rem, 6.5vw, 5rem); }
h1 { font-size: clamp(2.4rem, 5.5vw, 4.2rem); }
h2 { font-size: clamp(2rem, 4vw, 3.2rem); }
h3 { font-size: clamp(1.3rem, 2vw, 1.7rem); }
.lead { font-size: clamp(1.05rem, 1.4vw, 1.3rem); color: var(--slate); font-weight: 400; }
.eyebrow {
  display: inline-block; font-family: var(--font); font-weight: 600; font-size: 0.8rem;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--blue-600);
  background: var(--blue-050); padding: 8px 16px; border-radius: 100px; margin-bottom: 22px;
}
.muted { color: var(--gray); }
.balance { text-wrap: balance; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  font-weight: 600; font-size: 1rem; padding: 16px 30px; border-radius: 100px;
  transition: transform .35s var(--ease), box-shadow .35s var(--ease), background .3s, color .3s;
  will-change: transform;
}
.btn:hover { transform: translateY(-3px); }
.btn:active { transform: translateY(-1px); }
.btn-primary { background: var(--blue-600); color: #fff; box-shadow: var(--shadow-blue); }
.btn-primary:hover { background: var(--blue-500); box-shadow: 0 24px 60px var(--blue-glow); }
.btn-dark { background: var(--ink); color: #fff; box-shadow: var(--shadow); }
.btn-dark:hover { background: var(--charcoal); }
.btn-ghost { background: rgba(255,255,255,.08); color: #fff; border: 1px solid rgba(255,255,255,.28); backdrop-filter: blur(10px); }
.btn-ghost:hover { background: rgba(255,255,255,.16); }
.btn-outline { background: transparent; color: var(--ink); border: 1.5px solid var(--line); }
.btn-outline:hover { border-color: var(--ink); }
.btn-lg { padding: 19px 38px; font-size: 1.08rem; }
.btn-block { width: 100%; }

/* ---------- Navigation ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: all .4s var(--ease);
  padding: 20px 0;
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  background: rgba(255,255,255,.72); backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid rgba(255,255,255,.6); box-shadow: var(--shadow-sm);
  border-radius: 100px; padding: 12px 14px 12px 26px;
}
.nav.scrolled { padding: 12px 0; }
.brand { display: flex; align-items: center; gap: 11px; font-family: var(--display); font-weight: 800; font-size: 1.25rem; letter-spacing: -0.03em; }
.brand-mark {
  width: 38px; height: 38px; border-radius: 11px; display: grid; place-items: center;
  background: var(--blue-600); color: #fff; font-family: var(--display); font-weight: 800; font-size: 1.05rem;
  box-shadow: var(--shadow-blue);
}
.brand span { color: var(--blue-600); }
.nav-links { display: flex; align-items: center; gap: 34px; }
.nav-links a { font-weight: 500; font-size: 0.96rem; color: var(--charcoal); transition: color .25s; }
.nav-links a:hover { color: var(--blue-600); }
.nav-cta { display: flex; align-items: center; gap: 14px; }
.nav-cta .btn { padding: 11px 22px; font-size: 0.92rem; }
.nav-login { font-weight: 600; font-size: 0.95rem; color: var(--charcoal); }
.nav-login:hover { color: var(--blue-600); }
.burger { display: none; width: 44px; height: 44px; border-radius: 12px; place-items: center; }
.burger span { display: block; width: 20px; height: 2px; background: var(--ink); border-radius: 2px; position: relative; transition: .3s var(--ease); }
.burger span::before, .burger span::after { content:""; position:absolute; left:0; width:20px; height:2px; background: var(--ink); border-radius:2px; transition:.3s var(--ease); }
.burger span::before { top: -6px; } .burger span::after { top: 6px; }
body.menu-open .burger span { background: transparent; }
body.menu-open .burger span::before { top: 0; transform: rotate(45deg); }
body.menu-open .burger span::after { top: 0; transform: rotate(-45deg); }

/* mobile menu sheet */
.mobile-menu {
  position: fixed; inset: 0; z-index: 99; background: rgba(255,255,255,.98);
  backdrop-filter: blur(24px); display: flex; flex-direction: column; justify-content: center;
  gap: 8px; padding: 40px; opacity: 0; pointer-events: none; transform: translateY(-12px);
  transition: opacity .4s var(--ease), transform .4s var(--ease);
}
body.menu-open .mobile-menu { opacity: 1; pointer-events: auto; transform: none; }
.mobile-menu a { font-family: var(--display); font-weight: 700; font-size: 2rem; padding: 10px 0; color: var(--ink); }
.mobile-menu .btn { margin-top: 20px; }

/* ---------- Cards ---------- */
.card {
  background: #fff; border-radius: var(--radius-lg); border: 1px solid var(--line);
  box-shadow: var(--shadow-sm); overflow: hidden;
  transition: transform .5s var(--ease), box-shadow .5s var(--ease);
}
.card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.pill {
  display: inline-flex; align-items: center; gap: 7px; font-size: 0.8rem; font-weight: 600;
  padding: 6px 13px; border-radius: 100px; background: var(--mist); color: var(--slate);
}
.pill-blue { background: var(--blue-050); color: var(--blue-600); }

/* ---------- Grid helpers ---------- */
.grid { display: grid; gap: 28px; }
.g-2 { grid-template-columns: repeat(2, 1fr); }
.g-3 { grid-template-columns: repeat(3, 1fr); }
.g-4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- Scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity .9s var(--ease), transform .9s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .08s; }
.reveal.d2 { transition-delay: .16s; }
.reveal.d3 { transition-delay: .24s; }
.reveal.d4 { transition-delay: .32s; }

/* ---------- Section heading block ---------- */
.head { max-width: 720px; margin: 0 auto 64px; }
.head.left { margin-left: 0; text-align: left; }
.head p { margin-top: 18px; }

/* ---------- Footer ---------- */
.footer { background: var(--ink); color: #cfd4e0; padding: 90px 0 40px; }
.footer h4 { color: #fff; font-family: var(--font); font-size: 0.82rem; letter-spacing: .12em; text-transform: uppercase; margin-bottom: 22px; font-weight: 700; }
.footer a { color: #9aa2b5; font-size: 0.95rem; line-height: 2.1; transition: color .25s; }
.footer a:hover { color: #fff; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 60px; border-bottom: 1px solid rgba(255,255,255,.08); }
.footer .brand { color: #fff; margin-bottom: 18px; }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; padding-top: 30px; font-size: 0.88rem; color: #7a8296; gap: 16px; flex-wrap: wrap; }
.footer-social { display: flex; gap: 12px; }
.footer-social a { width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; background: rgba(255,255,255,.06); transition: background .3s; }
.footer-social a:hover { background: var(--blue-600); }

/* ---------- Utility ---------- */
.gradient-text { background: linear-gradient(120deg, var(--blue-600), #7aa0ff); -webkit-background-clip: text; background-clip: text; color: transparent; }
.divider { height: 1px; background: var(--line); border: 0; margin: 0; }
.stat-num { font-family: var(--display); font-weight: 800; font-size: clamp(2.4rem, 4vw, 3.4rem); letter-spacing: -0.04em; line-height: 1; }
.stat-num.blue { color: var(--blue-600); }

/* image placeholder blocks (swap for real photos later) */
.ph { position: relative; background: linear-gradient(135deg, #dfe6f5 0%, #cbd6ef 100%); overflow: hidden; }
.ph::after { content: attr(data-label); position: absolute; inset: 0; display: grid; place-items: center; color: rgba(20,30,60,.42); font-weight: 600; font-size: .82rem; letter-spacing: .04em; text-align: center; padding: 20px; }
.ph-blue { background: linear-gradient(135deg, #1a56ff 0%, #0a2a99 100%); }
.ph-blue::after { color: rgba(255,255,255,.55); }
.ph-dark { background: linear-gradient(135deg, #1c2230 0%, #0a0d14 100%); }
.ph-dark::after { color: rgba(255,255,255,.4); }

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .g-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 860px) {
  .section { padding: 84px 0; }
  .nav-links, .nav-cta .btn-primary, .nav-login { display: none; }
  .burger { display: grid; }
  .g-2, .g-3, .g-4 { grid-template-columns: 1fr; }
  .head { margin-bottom: 44px; }
}
@media (max-width: 520px) {
  .wrap { padding: 0 18px; }
  .section { padding: 68px 0; }
  .nav-inner { padding: 10px 12px 10px 20px; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
}