/* EbookVN — skin chung cho trang chủ + 3 landing page.
   Mỗi trang set --accent/--accent-soft riêng trong <style> của trang. */
*{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#0b0b10;--bg-2:#12121a;--card:#16161f;--line:#26262f;
  --ink:#f2ede4;--dim:#a7a29a;--accent:#e0b45c;--accent-soft:rgba(224,180,92,.14);
  --ok:#4ade80;
}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:'Be Vietnam Pro',system-ui,-apple-system,sans-serif;line-height:1.65;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.serif{font-family:'Playfair Display','Be Vietnam Pro',serif}
.wrap{max-width:1060px;margin:0 auto;padding:0 20px}

/* Nav */
.topbar{position:sticky;top:0;z-index:50;background:rgba(11,11,16,.85);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.topbar .wrap{display:flex;align-items:center;justify-content:space-between;height:58px}
.brand{font-family:'Playfair Display',serif;font-weight:700;font-size:20px;letter-spacing:.5px}
.brand em{font-style:normal;color:var(--accent)}
.topbar .cta-mini{background:var(--accent);color:#111;font-weight:700;font-size:14px;padding:9px 18px;border-radius:99px;transition:.2s;white-space:nowrap}
.topbar .cta-mini:hover{filter:brightness(1.1)}
.topbar .nav-links{display:flex;gap:22px;font-size:14px;color:var(--dim)}
.topbar .nav-links a:hover{color:var(--ink)}
@media(max-width:760px){.topbar .nav-links{display:none}}

/* Hero */
.hero{position:relative;overflow:hidden;background:radial-gradient(900px 500px at 75% -10%,var(--accent-soft),transparent 65%),var(--bg)}
.hero .wrap{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:56px;align-items:center;padding:64px 20px 72px}
@media(max-width:860px){.hero .wrap{grid-template-columns:1fr;gap:36px;padding:40px 20px 52px}.hero .cover-col{order:-1;max-width:250px;margin:0 auto}}
.kicker{display:inline-block;font-size:12.5px;font-weight:700;letter-spacing:2.5px;text-transform:uppercase;color:var(--accent);border:1px solid var(--accent);border-radius:99px;padding:5px 14px;margin-bottom:18px}
h1{font-family:'Playfair Display',serif;font-size:clamp(30px,4.6vw,48px);line-height:1.18;margin-bottom:16px}
h1 .hl{color:var(--accent)}
.sub{font-size:17px;color:var(--dim);max-width:560px;margin-bottom:24px}
.hero-points{list-style:none;margin-bottom:28px;display:grid;gap:9px;font-size:15.5px}
.hero-points li{padding-left:28px;position:relative}
.hero-points li::before{content:"✦";position:absolute;left:2px;color:var(--accent)}
.price-row{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:8px}
.price{font-size:34px;font-weight:800;color:var(--accent)}
.price small{font-size:15px;font-weight:500;color:var(--dim)}
.btn{display:inline-flex;align-items:center;gap:10px;background:var(--accent);color:#111;font-weight:800;font-size:16.5px;padding:15px 34px;border-radius:14px;border:none;cursor:pointer;transition:.2s;box-shadow:0 8px 30px var(--accent-soft)}
.btn:hover{transform:translateY(-2px);filter:brightness(1.08)}
.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line);box-shadow:none}
.btn.ghost:hover{border-color:var(--accent);color:var(--accent)}
.after-cta{font-size:13px;color:var(--dim);margin-top:12px}
.cover-col{position:relative}
.cover-col img{border-radius:10px;box-shadow:0 30px 70px rgba(0,0,0,.65),0 0 0 1px var(--line);transform:rotate(1.5deg)}
.cover-badge{position:absolute;z-index:2;top:-14px;right:-10px;background:var(--accent);color:#111;font-size:12.5px;font-weight:800;padding:7px 13px;border-radius:99px;box-shadow:0 6px 20px rgba(0,0,0,.5)}

/* Sections */
section{padding:64px 0}
section.alt{background:var(--bg-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
h2{font-family:'Playfair Display',serif;font-size:clamp(24px,3.2vw,34px);line-height:1.25;margin-bottom:14px}
.center{text-align:center}
.lead{color:var(--dim);font-size:16.5px;max-width:640px;margin:0 auto 40px}
.lead.left{margin:0 0 34px}

/* Pain */
.pain-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:14px}
.pain{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px 22px;font-size:15.5px}
.pain b{color:var(--accent)}

/* Learn list */
.learn-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:18px}
.learn{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:24px}
.learn h3{font-size:17px;margin-bottom:10px;color:var(--accent)}
.learn ul{list-style:none;display:grid;gap:8px;font-size:14.5px;color:var(--dim)}
.learn ul li{padding-left:22px;position:relative}
.learn ul li::before{content:"→";position:absolute;left:0;color:var(--accent)}

/* TOC */
.toc{max-width:720px;margin:0 auto;display:grid;gap:10px}
.toc details{background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.toc summary{cursor:pointer;padding:16px 20px;font-weight:700;font-size:15.5px;list-style:none;display:flex;gap:12px;align-items:baseline}
.toc summary::-webkit-details-marker{display:none}
.toc summary .no{color:var(--accent);font-family:'Playfair Display',serif;font-size:18px;min-width:30px}
.toc details[open] summary{border-bottom:1px solid var(--line)}
.toc .toc-body{padding:14px 20px 18px 62px;color:var(--dim);font-size:14.5px}
.toc .toc-body li{margin-bottom:6px}

/* Spec strip */
.specs{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;max-width:820px;margin:0 auto}
.spec{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;text-align:center}
.spec .big{font-size:22px;font-weight:800;color:var(--accent)}
.spec .lbl{font-size:13px;color:var(--dim);margin-top:4px}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:16px;counter-reset:st}
.step{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:24px;counter-increment:st;position:relative}
.step::before{content:counter(st,decimal-leading-zero);font-family:'Playfair Display',serif;font-size:30px;color:var(--accent);display:block;margin-bottom:8px}
.step b{display:block;margin-bottom:6px;font-size:16px}
.step p{font-size:14px;color:var(--dim)}

/* FAQ */
.faq{max-width:720px;margin:0 auto;display:grid;gap:10px}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:12px}
.faq summary{cursor:pointer;padding:16px 20px;font-weight:600;font-size:15.5px;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq p{padding:0 20px 16px;color:var(--dim);font-size:14.5px}

/* Cross-sell cards */
.books-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:22px}
.book-card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:24px;display:flex;flex-direction:column;transition:.25s}
.book-card:hover{transform:translateY(-4px);border-color:var(--bc,var(--accent))}
.book-card img{width:150px;margin:0 auto 18px;border-radius:8px;box-shadow:0 14px 34px rgba(0,0,0,.5)}
.book-card h3{font-family:'Playfair Display',serif;font-size:19px;text-align:center;margin-bottom:6px}
.book-card .meta{text-align:center;font-size:13px;color:var(--dim);margin-bottom:12px}
.book-card p{font-size:14.5px;color:var(--dim);margin-bottom:18px;flex:1}
.book-card .row{display:flex;align-items:center;justify-content:space-between;gap:10px}
.book-card .p{font-size:21px;font-weight:800;color:var(--bc,var(--accent))}
.book-card .go{font-size:14px;font-weight:700;border:1px solid var(--line);padding:9px 16px;border-radius:99px;transition:.2s}
.book-card .go:hover{border-color:var(--bc,var(--accent));color:var(--bc,var(--accent))}

/* Combo band */
.combo-band{background:linear-gradient(135deg,var(--accent-soft),transparent 60%),var(--card);border:1px solid var(--accent);border-radius:22px;padding:36px;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:28px;align-items:center}
@media(max-width:760px){.combo-band{grid-template-columns:1fr}}
.combo-band h3{font-family:'Playfair Display',serif;font-size:24px;margin-bottom:8px}
.combo-band p{color:var(--dim);font-size:15px}
.combo-price{text-align:center}
.combo-price .old{color:var(--dim);text-decoration:line-through;font-size:16px}
.combo-price .new{font-size:36px;font-weight:800;color:var(--accent)}

/* Guarantee */
.guarantee{display:flex;gap:18px;align-items:flex-start;background:var(--card);border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:14px;padding:22px 24px;max-width:720px;margin:0 auto}
.guarantee .ic{font-size:28px}
.guarantee b{display:block;margin-bottom:4px}
.guarantee p{font-size:14.5px;color:var(--dim)}

footer{border-top:1px solid var(--line);padding:34px 0;color:var(--dim);font-size:13.5px}
footer .wrap{display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap}
footer a{color:var(--accent)}

/* Sticky mobile CTA */
.mobile-cta{position:fixed;bottom:0;left:0;right:0;z-index:60;display:none;background:rgba(11,11,16,.92);backdrop-filter:blur(10px);border-top:1px solid var(--line);padding:10px 16px calc(10px + env(safe-area-inset-bottom));align-items:center;gap:14px;justify-content:space-between}
.mobile-cta .p{font-weight:800;color:var(--accent);font-size:18px}
.mobile-cta .btn{padding:11px 22px;font-size:15px}
@media(max-width:760px){.mobile-cta{display:flex}body{padding-bottom:66px}}

/* ===== Modal mua hàng ===== */
.modal-mask{position:fixed;inset:0;z-index:100;background:rgba(0,0,0,.72);backdrop-filter:blur(6px);display:none;align-items:flex-start;justify-content:center;padding:24px 14px;overflow-y:auto}
.modal-mask.show{display:flex}
.modal{background:var(--bg-2);border:1px solid var(--line);border-radius:20px;max-width:440px;width:100%;padding:28px;position:relative;margin:auto 0}
.modal .x{position:absolute;top:14px;right:16px;background:none;border:none;color:var(--dim);font-size:22px;cursor:pointer;line-height:1}
.modal h3{font-family:'Playfair Display',serif;font-size:21px;margin-bottom:4px;padding-right:28px}
.modal .msub{color:var(--dim);font-size:14px;margin-bottom:18px}
.modal label{display:block;font-size:13.5px;font-weight:600;margin-bottom:6px}
.modal input[type=email]{width:100%;background:var(--bg);border:1px solid var(--line);border-radius:10px;color:var(--ink);font-size:15px;padding:12px 14px;outline:none;font-family:inherit}
.modal input[type=email]:focus{border-color:var(--accent)}
.combo-up{display:flex;gap:10px;align-items:flex-start;background:var(--accent-soft);border:1px dashed var(--accent);border-radius:12px;padding:12px 14px;margin:16px 0;cursor:pointer;font-size:13.5px}
.combo-up input{margin-top:3px;accent-color:var(--accent)}
.combo-up b{color:var(--accent)}
.modal .btn{width:100%;justify-content:center;margin-top:14px}
.m-err{color:#f87171;font-size:13.5px;margin-top:10px;display:none}
.pay-qr{text-align:center}
.pay-qr img{width:216px;height:216px;border-radius:14px;background:#fff;padding:8px;margin:12px auto}
.pay-rows{display:grid;gap:8px;font-size:14px;background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin-top:6px}
.pay-rows .row{display:flex;justify-content:space-between;gap:12px}
.pay-rows .row span{color:var(--dim)}
.pay-rows .row b{text-align:right;word-break:break-all}
.pay-rows .code b{color:var(--accent);font-size:15px;letter-spacing:1px}
.pay-wait{display:flex;align-items:center;justify-content:center;gap:10px;color:var(--dim);font-size:13.5px;margin-top:14px}
.spinner{width:16px;height:16px;border:2px solid var(--line);border-top-color:var(--accent);border-radius:50%;animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.pay-done{text-align:center}
.pay-done .big-ic{font-size:52px;margin:6px 0 10px}
.dl-list{display:grid;gap:10px;margin:18px 0 8px}
.dl-list a{display:flex;align-items:center;gap:10px;background:var(--accent);color:#111;font-weight:700;font-size:15px;padding:13px 18px;border-radius:12px;justify-content:center;transition:.2s}
.dl-list a:hover{filter:brightness(1.08)}
.pay-note{font-size:13px;color:var(--dim);margin-top:12px;text-align:center}
.pay-note a{color:var(--accent)}