/* =====================================================================
   Practical Guide to AI for Educators — shared site styles
   Premium / minimal / navy + gold. Mobile-first.
   ===================================================================== */
:root{
  --navy:#0f2447;
  --navy-2:#16305c;
  --navy-3:#1f3f78;
  --gold:#c9a227;
  --ink:#16213e;
  --muted:#5b6785;
  --bg:#ffffff;
  --panel:#f6f8fc;
  --line:#e6eaf4;
  --radius:14px;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth; scroll-padding-top:76px;}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%; display:block;}
a{color:inherit; text-decoration:none;}
.wrap{max-width:1100px; margin:0 auto; padding:0 24px;}
h1,h2,h3,h4{margin:0; font-weight:700; letter-spacing:-0.01em;}
p{line-height:1.7; color:var(--muted); margin:0 0 14px;}
ul{margin:0; padding:0;}
li{list-style:none;}
.container-sm{max-width:760px; margin:0 auto;}

/* ---------- NAV ---------- */
.site-nav{
  position:sticky; top:0; z-index:100; background:rgba(255,255,255,.96); backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.nav-inner{max-width:1100px; margin:0 auto; padding:16px 24px; display:flex; align-items:center; justify-content:space-between;}
.nav-brand{font-weight:700; font-size:15px; color:var(--navy); display:flex; flex-direction:column; line-height:1.25;}
.nav-brand small{font-weight:600; font-size:11px; color:var(--gold); letter-spacing:.5px; text-transform:uppercase;}
.nav-links{display:flex; gap:30px; font-size:14px; font-weight:600; color:var(--muted);}
.nav-links a:hover{color:var(--navy);}
.nav-cta{background:var(--navy); color:#fff !important; padding:11px 22px; border-radius:30px; font-weight:700; font-size:13.5px;}
.nav-toggle{display:none; background:none; border:none; font-size:22px; color:var(--navy); cursor:pointer;}
@media(max-width:860px){
  .nav-links{display:none;}
  .nav-toggle{display:block;}
}

/* ---------- HERO ---------- */
.hero{background:linear-gradient(150deg,var(--navy) 0%, var(--navy-2) 55%, var(--navy-3) 100%); color:#fff; position:relative; overflow:hidden;}
.hero .wrap{display:grid; grid-template-columns:1.05fr .95fr; gap:48px; align-items:center; padding:72px 24px 64px;}
@media(max-width:880px){ .hero .wrap{grid-template-columns:1fr; padding:44px 20px 40px;} }
.eyebrow{display:inline-block; font-size:12.5px; font-weight:700; letter-spacing:1.5px; text-transform:uppercase; color:var(--gold); margin-bottom:18px;}
.hero h1{font-size:44px; line-height:1.18; color:#fff;}
@media(max-width:560px){ .hero h1{font-size:30px;} }
.hero p.lead{color:#c7d3ea; font-size:17px; margin-top:18px; max-width:520px;}
.hero-meta{display:flex; gap:14px; flex-wrap:wrap; margin-top:22px; font-size:13px; color:#aebadb;}
.hero-meta span{background:rgba(255,255,255,.08); border:1px solid rgba(255,255,255,.18); padding:6px 13px; border-radius:20px;}
.hero-ctas{display:flex; gap:14px; margin-top:30px; flex-wrap:wrap;}
.hero-price{margin-top:26px; display:flex; align-items:baseline; gap:10px;}
.hero-price .now{font-size:30px; font-weight:700; color:#fff;}
.hero-price .was{font-size:16px; color:#8fa0c9; text-decoration:line-through;}
.hero-price .region{font-size:12px; color:#8fa0c9; text-transform:uppercase; letter-spacing:.5px;}
.hero-img{display:flex; justify-content:center;}
.hero-img img{width:min(360px,85%); filter:drop-shadow(0 30px 40px rgba(0,0,0,.4));}

/* ---------- BUTTONS ---------- */
.btn{display:inline-flex; align-items:center; justify-content:center; gap:8px; padding:15px 30px; border-radius:32px; font-weight:700; font-size:15px; border:none; cursor:pointer; text-align:center;}
.btn-gold{background:var(--gold); color:var(--navy);}
.btn-gold:hover{background:#dab53a;}
.btn-outline-light{background:transparent; color:#fff; border:1.5px solid rgba(255,255,255,.55);}
.btn-outline{background:transparent; color:var(--navy); border:1.5px solid var(--navy);}
.btn-navy{background:var(--navy); color:#fff;}
.btn-block{width:100%;}

/* ---------- SECTIONS ---------- */
section{padding:72px 0;}
@media(max-width:640px){ section{padding:48px 0;} }
.section-head{max-width:640px; margin:0 auto 42px; text-align:center;}
.section-head h2{font-size:30px; color:var(--ink);}
@media(max-width:560px){ .section-head h2{font-size:24px;} }
.section-head p{margin-top:12px;}
.panel-bg{background:var(--panel);}
.line-top{border-top:1px solid var(--line);}
.line-bottom{border-bottom:1px solid var(--line);}

/* ---------- PROBLEM LIST ---------- */
.problem-grid{display:grid; grid-template-columns:repeat(2,1fr); gap:14px; max-width:820px; margin:0 auto;}
@media(max-width:640px){ .problem-grid{grid-template-columns:1fr;} }
.problem-item{display:flex; gap:12px; align-items:flex-start; background:#fff; border:1px solid var(--line); border-radius:12px; padding:16px 18px;}
.problem-item .mark{flex:none; width:22px; height:22px; border-radius:50%; background:#fde8e8; color:#c23; font-size:12px; font-weight:700; display:flex; align-items:center; justify-content:center;}
.problem-item p{margin:0; font-size:14.5px; color:var(--ink);}

/* ---------- CARDS GRID ---------- */
.cards-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:18px;}
@media(max-width:860px){ .cards-grid{grid-template-columns:repeat(2,1fr);} }
@media(max-width:560px){ .cards-grid{grid-template-columns:1fr;} }
.card{background:#fff; border:1px solid var(--line); border-radius:var(--radius); padding:24px;}
.card .icon{width:38px; height:38px; border-radius:9px; background:var(--panel); border:1px solid var(--line); display:flex; align-items:center; justify-content:center; font-weight:700; color:var(--navy); font-size:15px; margin-bottom:14px;}
.card h3{font-size:16.5px; color:var(--ink); margin-bottom:6px;}
.card p{font-size:14px; margin:0;}

/* ---------- CHAPTER LIST ---------- */
.chapter-list{display:flex; flex-direction:column; gap:10px; max-width:820px; margin:0 auto;}
.chapter-row{display:flex; gap:16px; align-items:flex-start; background:#fff; border:1px solid var(--line); border-radius:12px; padding:18px 20px;}
.chapter-row .num{flex:none; width:30px; height:30px; border-radius:8px; background:var(--navy); color:#fff; font-size:13px; font-weight:700; display:flex; align-items:center; justify-content:center;}
.chapter-row h3{font-size:15.5px; color:var(--ink); margin-bottom:4px;}
.chapter-row p{font-size:13.5px; margin:0;}

/* ---------- GALLERY ---------- */
.gallery{display:flex; gap:20px; overflow-x:auto; padding:6px 2px 14px;}
.gallery img{width:220px; flex:none; border-radius:10px; border:1px solid var(--line); box-shadow:0 12px 26px rgba(15,36,71,.12);}
.gallery-cap{width:220px; flex:none; text-align:center; font-size:12.5px; color:var(--muted); margin-top:8px;}
.gallery-item{display:flex; flex-direction:column; align-items:center;}

/* ---------- AUDIENCE ---------- */
.audience-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:14px;}
@media(max-width:860px){ .audience-grid{grid-template-columns:repeat(2,1fr);} }
@media(max-width:560px){ .audience-grid{grid-template-columns:1fr;} }
.audience-item{background:#fff; border:1px solid var(--line); border-radius:12px; padding:16px 18px; font-weight:600; font-size:14.5px; color:var(--ink); display:flex; align-items:center; gap:10px;}
.audience-item:before{content:""; width:7px; height:7px; border-radius:50%; background:var(--gold); flex:none;}

/* ---------- AUTHOR ---------- */
.author-card{display:flex; gap:32px; align-items:center; background:#fff; border:1px solid var(--line); border-radius:18px; padding:36px;}
@media(max-width:680px){ .author-card{flex-direction:column; text-align:center;} }
.author-card img{width:120px; height:120px; border-radius:50%; border:3px solid var(--gold); flex:none;}
.author-card h3{font-size:21px; color:var(--ink); margin-bottom:4px;}
.author-card .role{color:var(--gold); font-weight:700; font-size:13px; letter-spacing:.3px; margin-bottom:12px; text-transform:uppercase;}

/* ---------- TRUST STRIP ---------- */
.trust-strip{display:flex; gap:14px; flex-wrap:wrap; justify-content:center;}
.trust-pill{background:#fff; border:1px solid var(--line); border-radius:24px; padding:10px 18px; font-size:13.5px; font-weight:600; color:var(--ink);}

/* ---------- PRICING ---------- */
.price-grid{display:grid; grid-template-columns:1fr 1fr; gap:22px; max-width:760px; margin:0 auto;}
@media(max-width:640px){ .price-grid{grid-template-columns:1fr;} }
.price-card{background:#fff; border:1.5px solid var(--line); border-radius:18px; padding:32px; text-align:center; position:relative;}
.price-card.featured{border-color:var(--gold); box-shadow:0 20px 44px rgba(201,162,39,.16);}
.price-card .tag{position:absolute; top:-13px; left:50%; transform:translateX(-50%); background:var(--gold); color:var(--navy); font-size:11px; font-weight:700; letter-spacing:.4px; padding:5px 14px; border-radius:20px; text-transform:uppercase;}
.price-card .region{font-size:12.5px; color:var(--muted); font-weight:700; text-transform:uppercase; letter-spacing:.6px;}
.price-card .amount{font-size:40px; font-weight:700; color:var(--navy); margin:10px 0 2px;}
.price-card .was{font-size:14px; color:var(--muted); text-decoration:line-through;}
.price-card ul{margin:20px 0; text-align:left; font-size:13.5px; color:var(--muted);}
.price-card li{margin-bottom:9px; padding-left:22px; position:relative;}
.price-card li:before{content:"✓"; position:absolute; left:0; color:var(--gold); font-weight:700;}
.price-note{text-align:center; font-size:13px; color:var(--muted); margin-top:22px; max-width:520px; margin-left:auto; margin-right:auto;}

/* ---------- FAQ ---------- */
.faq-item{border-bottom:1px solid var(--line); padding:18px 0;}
.faq-item summary{font-weight:700; font-size:15px; cursor:pointer; color:var(--ink); list-style:none; display:flex; justify-content:space-between; gap:16px;}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary:after{content:"+"; font-size:20px; color:var(--gold); font-weight:700; flex:none;}
.faq-item[open] summary:after{content:"–";}
.faq-item p{margin-top:10px; font-size:14.5px;}

/* ---------- CTA BAND ---------- */
.cta-band{background:linear-gradient(135deg,var(--navy) 0%, var(--navy-2) 100%); color:#fff; text-align:center; padding:60px 24px;}
.cta-band h2{color:#fff; font-size:28px; margin-bottom:12px;}
.cta-band p{color:#c7d3ea; max-width:460px; margin:0 auto 24px;}

/* ---------- FOOTER ---------- */
footer{background:var(--navy); color:#9fadd0; padding:44px 24px 100px; font-size:13.5px;}
@media(min-width:761px){ footer{padding-bottom:44px;} }
.footer-grid{max-width:1100px; margin:0 auto; display:grid; grid-template-columns:1.4fr 1fr 1fr; gap:36px;}
@media(max-width:760px){ .footer-grid{grid-template-columns:1fr; gap:26px;} }
.footer-brand{color:#fff; font-weight:700; font-size:16px; margin-bottom:8px;}
.footer-col h4{color:#fff; font-size:13px; text-transform:uppercase; letter-spacing:.5px; margin-bottom:12px;}
.footer-col a{display:block; margin-bottom:9px; color:#9fadd0;}
.footer-col a:hover{color:#fff;}
.footer-bottom{max-width:1100px; margin:34px auto 0; padding-top:22px; border-top:1px solid rgba(255,255,255,.1); display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px; font-size:12.5px; color:#7c8bb3;}

/* ---------- STICKY MOBILE BUY BAR ---------- */
.sticky-buy{
  display:none; position:fixed; left:0; right:0; bottom:0; z-index:200; background:#fff;
  border-top:1px solid var(--line); padding:10px 16px calc(10px + env(safe-area-inset-bottom,0px));
  box-shadow:0 -8px 20px rgba(15,36,71,.12);
}
@media(max-width:760px){ .sticky-buy{display:flex; gap:10px; align-items:center;} }
.sticky-buy .info{flex:1; font-size:12.5px; color:var(--muted);}
.sticky-buy .info b{display:block; font-size:16px; color:var(--navy);}

/* ---------- LEGAL PAGES ---------- */
.legal h2{font-size:22px; margin-top:34px; margin-bottom:10px; color:var(--ink);}
.legal h2:first-child{margin-top:0;}
.legal p, .legal li{font-size:14.5px;}
.legal li{list-style:disc; margin-left:20px; margin-bottom:8px;}
.legal-hero{background:var(--panel); padding:44px 24px; border-bottom:1px solid var(--line);}
.legal-hero h1{font-size:28px; color:var(--navy);}
.legal-hero p{margin-top:8px; font-size:13.5px;}

/* ---------- SUCCESS PAGE ---------- */
.success-box{max-width:560px; margin:0 auto; text-align:center; padding:80px 24px;}
.success-icon{width:64px; height:64px; border-radius:50%; background:#e8f6ee; color:#1a9e58; font-size:30px; display:flex; align-items:center; justify-content:center; margin:0 auto 20px;}
.success-box h1{font-size:26px; margin-bottom:12px; color:var(--ink);}
.download-card{background:var(--panel); border:1px solid var(--line); border-radius:14px; padding:26px; margin-top:26px;}