/* ─── DESIGN TOKENS (shared TavaOne brand system) ──── */
:root{
  --bg:          #0f172a;
  --bg-card:     #1e293b;
  --bg-alt:      #131f36;
  --bg-input:    #0d1526;
  --border:      #334155;
  --border2:     #475569;
  --text:        #e2e8f0;
  --text-muted:  #94a3b8;
  --text-light:  #cbd5e1;
  --text-lt:     #f8fafc;
  --green:       #10b981;
  --green-dk:    #059669;
  --green-lt:    #064e3b;
  --amber:       #f59e0b;
  --shadow:      0 1px 3px rgba(0,0,0,0.3);
  --shadow-md:   0 8px 24px rgba(0,0,0,0.35);
  --radius:      8px;
  --font:        'Plus Jakarta Sans', system-ui, sans-serif;
  --mono:        'JetBrains Mono', monospace;
  --max:         1080px;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{
  font-family:var(--font);background:var(--bg);color:var(--text);
  font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

/* ─── HEADER ─────────────────────────────────────── */
header{
  position:sticky;top:0;z-index:100;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 24px;height:64px;
  background:rgba(15,23,42,0.85);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border);
}
.logo{font-size:1.15rem;font-weight:800;letter-spacing:0.01em;display:flex;align-items:center;gap:5px}
.logo-tava{color:#fff;font-weight:800}
.logo-one{color:var(--green);font-weight:800}
.logo-slash{color:rgba(255,255,255,0.4);font-weight:700}
.logo-edu{color:var(--green);font-weight:800}
.nav{display:flex;align-items:center;gap:26px}
.nav a{font-size:0.82rem;font-weight:600;color:var(--text-muted);transition:color .15s}
.nav a:hover{color:var(--text-lt)}
.nav-cta{
  background:var(--green);color:#04221a !important;padding:8px 16px;
  border-radius:var(--radius);font-weight:700;
}
.nav-cta:hover{background:var(--green-dk)}

/* ─── BUTTONS ────────────────────────────────────── */
.btn{
  display:inline-block;font-family:var(--font);font-weight:700;font-size:0.92rem;
  padding:13px 26px;border-radius:var(--radius);transition:transform .12s,background .15s,border-color .15s;
  letter-spacing:0.01em;cursor:pointer;border:1px solid transparent;
}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--green);color:#04221a}
.btn-primary:hover{background:var(--green-dk)}
.btn-ghost{background:transparent;color:var(--text-lt);border-color:var(--border2)}
.btn-ghost:hover{border-color:var(--green);color:var(--green)}
.btn-block{width:100%;text-align:center}

/* ─── HERO ───────────────────────────────────────── */
.hero{
  position:relative;overflow:hidden;
  max-width:var(--max);margin:0 auto;padding:88px 24px 70px;text-align:center;
}
.hero > *:not(.hero-graphic){position:relative;z-index:1}
.hero-graphic{
  position:absolute;inset:0;margin:0;z-index:0;pointer-events:none;
  display:flex;align-items:center;justify-content:center;opacity:.13;
}
.hero-icon{display:flex;justify-content:center;margin-bottom:20px}
.antenna{
  height:auto;color:var(--green);
  stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;
}
.hero-graphic .antenna{width:min(560px,92%)}
.hero-icon .antenna{width:76px}
.antenna .wave{animation:signal 3s ease-in-out infinite}
.antenna .w1{animation-delay:0s}
.antenna .w2{animation-delay:.35s}
.antenna .w3{animation-delay:.7s}
@keyframes signal{0%,100%{opacity:.12}50%{opacity:.9}}
@media (prefers-reduced-motion:reduce){
  .antenna .wave{animation:none;opacity:.55}
}

/* ─── WAVE DIVIDER ───────────────────────────────── */
.wave-divider{width:100%;max-width:none;line-height:0;margin:0;padding:0}
.wave-divider svg{
  display:block;width:100%;height:30px;color:var(--green);
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 18%,#000 82%,transparent);
          mask-image:linear-gradient(90deg,transparent,#000 18%,#000 82%,transparent);
}
.wave-divider path{fill:none;stroke:currentColor;stroke-width:2;opacity:.38;vector-effect:non-scaling-stroke}
.kicker{
  display:inline-block;font-size:0.7rem;font-weight:700;letter-spacing:0.28em;
  text-transform:uppercase;color:var(--green);margin-bottom:22px;
  border:1px solid var(--green-lt);padding:6px 14px;border-radius:100px;
  background:rgba(16,185,129,0.06);
}
.hero h1{
  font-size:clamp(2.2rem,6vw,3.8rem);font-weight:800;line-height:1.08;
  letter-spacing:-0.02em;color:var(--text-lt);margin-bottom:22px;
}
.hero h1 .accent{color:var(--green)}
.lede{
  font-size:clamp(1rem,2.4vw,1.22rem);color:var(--text-light);
  max-width:660px;margin:0 auto 34px;line-height:1.65;
}
.lede strong{color:var(--text-lt)}
.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:56px}
.hero-stats{display:flex;gap:48px;justify-content:center;flex-wrap:wrap}
.stat-val{font-size:2.1rem;font-weight:800;color:var(--green);line-height:1}
.stat-lbl{font-size:0.66rem;font-weight:700;letter-spacing:0.18em;text-transform:uppercase;color:var(--text-muted);margin-top:6px}

/* ─── SECTIONS ───────────────────────────────────── */
.section{max-width:var(--max);margin:0 auto;padding:80px 24px}
.section-alt{background:var(--bg-alt);max-width:none}
.section-alt > *{max-width:var(--max);margin-left:auto;margin-right:auto}
.section-head{text-align:center;max-width:640px;margin:0 auto 50px}
.section-kicker{font-size:0.68rem;font-weight:700;letter-spacing:0.26em;text-transform:uppercase;color:var(--green);margin-bottom:12px}
.section-head h2{font-size:clamp(1.7rem,4vw,2.5rem);font-weight:800;letter-spacing:-0.02em;color:var(--text-lt);margin-bottom:16px}
.section-sub{color:var(--text-muted);font-size:1.02rem;line-height:1.65}

/* ─── GRID + CARDS ───────────────────────────────── */
.grid{display:grid;gap:20px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.card{
  background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);
  padding:28px 24px;transition:border-color .18s,transform .18s;
}
.card:hover{border-color:var(--green);transform:translateY(-3px)}
.card-icon{font-size:2rem;margin-bottom:14px}
.card h3{font-size:1.18rem;font-weight:700;color:var(--text-lt);margin-bottom:10px}
.card p{color:var(--text-muted);font-size:0.94rem}

/* ─── TRACKS ─────────────────────────────────────── */
.track{
  background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);
  padding:28px;transition:border-color .18s;
}
.track:hover{border-color:var(--green)}
.track-tag{
  display:inline-block;font-family:var(--mono);font-size:0.7rem;font-weight:700;
  letter-spacing:0.14em;text-transform:uppercase;color:var(--green);
  background:var(--green-lt);padding:4px 10px;border-radius:4px;margin-bottom:16px;
}
.track h3{font-size:1.3rem;font-weight:700;color:var(--text-lt);margin-bottom:8px}
.track > p{color:var(--text-muted);font-size:0.95rem;margin-bottom:18px}
.track-list{list-style:none;display:flex;flex-direction:column;gap:9px}
.track-list li{
  position:relative;padding-left:22px;font-size:0.9rem;color:var(--text-light);
}
.track-list li::before{
  content:'';position:absolute;left:0;top:8px;width:7px;height:7px;
  background:var(--green);border-radius:50%;box-shadow:0 0 6px rgba(16,185,129,0.5);
}
.track-link{
  display:inline-block;margin-top:18px;font-size:0.85rem;font-weight:700;
  color:var(--green);border-bottom:1px solid transparent;transition:border-color .15s;
}
.track-link:hover{border-bottom-color:var(--green)}

/* ─── FEATURED BOOK ──────────────────────────────── */
.book{
  display:grid;grid-template-columns:280px 1fr;gap:40px;align-items:center;
  max-width:920px;margin:0 auto;
  background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);
  padding:36px;box-shadow:var(--shadow-md);
}
.book-cover{display:block;border-radius:var(--radius);overflow:hidden;transition:transform .18s}
.book-cover:hover{transform:translateY(-4px)}
.book-cover img{width:100%;height:auto;border-radius:var(--radius);box-shadow:0 12px 30px rgba(0,0,0,0.45)}
.book-body .section-kicker{text-align:left;margin-bottom:10px}
.book-body h2{font-size:clamp(1.6rem,4vw,2.3rem);font-weight:800;letter-spacing:-0.02em;color:var(--text-lt);margin-bottom:6px}
.book-sub{font-size:1.05rem;font-weight:600;color:var(--green);margin-bottom:16px}
.book-lede{color:var(--text-light);font-size:0.97rem;line-height:1.65;margin-bottom:18px}
.book-author{color:var(--text-muted);font-size:0.9rem;margin-bottom:22px}
.book-author strong{color:var(--text-lt)}

/* ─── RESOURCES ──────────────────────────────────── */
.resource{
  background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);
  padding:24px;transition:border-color .18s,transform .18s;
}
.resource:hover{border-color:var(--green);transform:translateY(-3px)}
.resource h3{font-size:1.02rem;font-weight:700;color:var(--green);margin-bottom:8px}
.resource p{color:var(--text-muted);font-size:0.9rem}

/* ─── CTA ────────────────────────────────────────── */
.cta{
  text-align:center;padding:90px 24px;max-width:var(--max);margin:0 auto;
}
.cta h2{font-size:clamp(1.6rem,4vw,2.4rem);font-weight:800;color:var(--text-lt);margin-bottom:28px;letter-spacing:-0.02em}

/* ─── FOOTER ─────────────────────────────────────── */
.site-footer{
  border-top:1px solid var(--border);background:var(--bg-card);
  padding:34px 24px;display:flex;flex-wrap:wrap;align-items:center;
  justify-content:space-between;gap:18px;max-width:none;
}
.footer-logo{font-size:1rem;font-weight:800;display:flex;gap:5px}
.footer-nav{display:flex;gap:22px}
.footer-nav a{font-size:0.85rem;color:var(--text-muted);transition:color .15s}
.footer-nav a:hover{color:var(--green)}
.footer-copy{font-size:0.78rem;color:var(--text-muted);font-family:var(--mono)}

/* ─── RESPONSIVE ─────────────────────────────────── */
@media (max-width:860px){
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .book{grid-template-columns:1fr;gap:28px;text-align:center;padding:30px 24px}
  .book-cover{max-width:240px;margin:0 auto}
  .book-body .section-kicker{text-align:center}
}
@media (max-width:680px){
  .nav a:not(.nav-cta){display:none}
  .grid-2,.grid-3{grid-template-columns:1fr}
  .hero-stats{gap:32px}
  .hero{padding:60px 20px 50px}
  .section{padding:60px 20px}
  .footer-nav{gap:16px}
}