/* Haryana LEET Book — landing, login, checkout and reader styles */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

.bk{--navy:#0a1330;--navy2:#13204f;--blue:#1a56db;--sky:#38bdf8;--gold:#fbbf24;--gold2:#f59e0b;--ink:#0f172a;--mut:#64748b;--line:#e2e8f0;--card:#fff;--bg:#f4f7ff;--ok:#16a34a;--bad:#dc2626;
  font-family:'Plus Jakarta Sans',system-ui,-apple-system,Segoe UI,sans-serif;color:var(--ink);line-height:1.6}
.bk *{box-sizing:border-box}
.bk a{color:inherit}
.bk img{max-width:100%}
.bk-wrap{width:100%;max-width:1240px;margin:0 auto;padding:0 clamp(16px,3vw,32px)}

/* ───────── HERO ───────── */
.bk-hero{position:relative;overflow:hidden;background:radial-gradient(1200px 600px at 78% 10%,#1d3a8a 0%,transparent 60%),radial-gradient(900px 500px at 5% 90%,#5b21b6 0%,transparent 55%),linear-gradient(160deg,#050a1f,#0a1330 55%,#101c47);color:#fff;padding:clamp(48px,7vw,96px) 0 clamp(64px,8vw,110px)}
.bk-hero::before{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(255,255,255,.35) 1px,transparent 1.5px);background-size:46px 46px;opacity:.12;animation:bkDrift 60s linear infinite}
@keyframes bkDrift{to{background-position:460px 230px}}
.bk-hero-grid{position:relative;display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(24px,5vw,72px);align-items:center}
.bk-pill{display:inline-flex;align-items:center;gap:8px;padding:7px 15px;border-radius:999px;background:rgba(251,191,36,.14);border:1px solid rgba(251,191,36,.45);color:var(--gold);font-weight:700;font-size:13px;letter-spacing:.02em}
.bk-hero h1{font-size:clamp(2.1rem,4.8vw,3.7rem);line-height:1.08;margin:18px 0 14px;font-weight:800;letter-spacing:-.02em}
.bk-hero h1 em{font-style:normal;background:linear-gradient(90deg,var(--gold),#fb923c);-webkit-background-clip:text;background-clip:text;color:transparent}
.bk-lead{font-size:clamp(1rem,1.5vw,1.2rem);color:#cbd5f5;max-width:560px}
.bk-price-row{display:flex;align-items:flex-end;flex-wrap:wrap;gap:14px 22px;margin:26px 0 8px}
.bk-price{font-size:clamp(2.6rem,5vw,3.6rem);font-weight:800;line-height:1;color:#fff}
.bk-price small{font-size:1rem;font-weight:600;color:#93a5d8;margin-left:6px}
.bk-mrp{color:#8aa0d6;text-decoration:line-through;font-size:1.2rem;font-weight:600}
.bk-save{background:linear-gradient(135deg,#22c55e,#16a34a);color:#fff;padding:5px 12px;border-radius:999px;font-size:13px;font-weight:800}
.bk-ultra-note{display:inline-flex;gap:8px;align-items:center;margin:4px 0 22px;color:#ddd6fe;font-size:14px;font-weight:600}
.bk-cta-row{display:flex;flex-wrap:wrap;gap:12px}
.bk-btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;border:0;cursor:pointer;font-family:inherit;font-weight:800;font-size:1rem;padding:15px 28px;border-radius:14px;text-decoration:none;transition:transform .18s,box-shadow .18s,background .18s}
.bk-btn:hover{transform:translateY(-3px)}
.bk-btn-gold{background:linear-gradient(135deg,var(--gold),var(--gold2));color:#1f2937;box-shadow:0 10px 30px rgba(245,158,11,.4)}
.bk-btn-gold:hover{box-shadow:0 14px 38px rgba(245,158,11,.55)}
.bk-btn-ghost{background:rgba(255,255,255,.1);color:#fff;border:1.5px solid rgba(255,255,255,.35);backdrop-filter:blur(6px)}
.bk-btn-ghost:hover{background:rgba(255,255,255,.18)}
.bk-btn-blue{background:linear-gradient(135deg,#2563eb,#1a56db);color:#fff;box-shadow:0 10px 26px rgba(26,86,219,.35)}
.bk-trust{display:flex;flex-wrap:wrap;gap:10px 22px;margin-top:26px;color:#a5b4e0;font-size:13.5px;font-weight:600}
.bk-trust span{display:inline-flex;gap:7px;align-items:center}

/* ───────── 3D BOOK ───────── */
.bk3d-stage{position:relative;perspective:1500px;height:clamp(420px,52vw,560px);display:flex;align-items:center;justify-content:center}
.bk3d-glow{position:absolute;width:70%;aspect-ratio:1;border-radius:50%;background:radial-gradient(circle,rgba(56,189,248,.35),rgba(124,58,237,.18) 45%,transparent 70%);filter:blur(24px);animation:bkPulse 5s ease-in-out infinite}
@keyframes bkPulse{50%{transform:scale(1.12);opacity:.8}}
.bk3d-float{position:relative;transform-style:preserve-3d;animation:bkFloat 6s ease-in-out infinite}
@keyframes bkFloat{50%{transform:translateY(-16px)}}
.bk3d{--w:clamp(210px,24vw,300px);--h:calc(var(--w) * 1.4);--t:calc(var(--w) * .24);position:relative;width:var(--w);height:var(--h);transform-style:preserve-3d;transform:rotateX(8deg) rotateY(-32deg);transition:transform .25s ease-out;animation:bkSpin 14s ease-in-out infinite}
.bk3d.manual{animation:none}
@keyframes bkSpin{0%,100%{transform:rotateX(8deg) rotateY(-34deg)}50%{transform:rotateX(5deg) rotateY(22deg)}}
.bk3d>div{position:absolute;backface-visibility:hidden}
.bk3d .f{inset:0;transform:translateZ(calc(var(--t) / 2));border-radius:3px 8px 8px 3px;overflow:hidden;box-shadow:inset 6px 0 14px rgba(0,0,0,.35)}
.bk3d .f img{width:100%;height:100%;object-fit:cover;display:block}
.bk3d .f::after{content:"";position:absolute;inset:0;background:linear-gradient(105deg,rgba(255,255,255,.28) 0%,transparent 28%,transparent 70%,rgba(0,0,0,.18));pointer-events:none}
.bk3d .b{inset:0;transform:rotateY(180deg) translateZ(calc(var(--t) / 2));background:linear-gradient(135deg,#0b1a4a,#1d3a8a);border-radius:8px 3px 3px 8px}
.bk3d .sp{left:0;top:0;width:var(--t);height:100%;transform:rotateY(-90deg) translateZ(calc(var(--t) / 2));transform-origin:center;background:linear-gradient(180deg,#0a1330,#1d3a8a);display:flex;align-items:center;justify-content:center;overflow:hidden}
.bk3d .sp span{writing-mode:vertical-rl;transform:rotate(180deg);color:var(--gold);font-weight:800;font-size:calc(var(--t) * .26);letter-spacing:.12em;white-space:nowrap}
.bk3d .pg{right:0;top:3px;width:var(--t);height:calc(100% - 6px);transform:rotateY(90deg) translateZ(calc(var(--t) / 2));transform-origin:center;background:repeating-linear-gradient(90deg,#f8fafc 0 2px,#d9e0ec 2px 3px)}
.bk3d .tp{left:3px;top:0;width:calc(100% - 6px);height:var(--t);transform:rotateX(90deg) translateZ(calc(var(--t) / 2));transform-origin:center;background:repeating-linear-gradient(0deg,#f8fafc 0 2px,#d9e0ec 2px 3px)}
.bk3d .bt{left:3px;bottom:0;width:calc(100% - 6px);height:var(--t);transform:rotateX(-90deg) translateZ(calc(var(--t) / 2));transform-origin:center;background:#cbd5e1}
.bk3d-shadow{position:absolute;bottom:2%;width:56%;height:26px;border-radius:50%;background:radial-gradient(ellipse,rgba(0,0,0,.55),transparent 70%);filter:blur(6px);animation:bkShadow 6s ease-in-out infinite}
@keyframes bkShadow{50%{transform:scale(.82);opacity:.6}}
.bk-chip{position:absolute;display:flex;flex-direction:column;align-items:center;padding:11px 16px;border-radius:16px;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.28);backdrop-filter:blur(10px);color:#fff;font-size:12px;font-weight:600;box-shadow:0 14px 34px rgba(0,0,0,.3);animation:bkChip 7s ease-in-out infinite}
.bk-chip b{font-size:1.45rem;font-weight:800;color:var(--gold);line-height:1.1}
.bk-chip.c1{left:0;top:12%;animation-delay:-1s}.bk-chip.c2{right:-2%;top:34%;animation-delay:-3s}.bk-chip.c3{left:6%;bottom:12%;animation-delay:-5s}
@keyframes bkChip{50%{transform:translateY(-14px) rotate(-1.5deg)}}

/* ───────── SECTIONS ───────── */
.bk-sec{padding:clamp(48px,7vw,92px) 0}
.bk-sec.alt{background:var(--bg)}
.bk-sec.dark{background:linear-gradient(160deg,#071026,#101c47);color:#fff}
.bk-eyebrow{display:inline-block;color:var(--blue);font-weight:800;font-size:13px;letter-spacing:.14em;text-transform:uppercase;margin-bottom:8px}
.dark .bk-eyebrow{color:var(--gold)}
.bk-h2{font-size:clamp(1.7rem,3.4vw,2.6rem);line-height:1.15;font-weight:800;letter-spacing:-.015em;margin:0 0 12px}
.bk-sub{color:var(--mut);max-width:680px;font-size:1.05rem;margin:0 0 34px}
.dark .bk-sub{color:#b6c4ee}
.bk-center{text-align:center}.bk-center .bk-sub{margin-left:auto;margin-right:auto}

.bk-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:-56px;position:relative;z-index:3}
.bk-stat{background:#fff;border-radius:20px;padding:22px 18px;text-align:center;box-shadow:0 18px 50px rgba(15,23,42,.12);border:1px solid var(--line)}
.bk-stat b{display:block;font-size:clamp(1.7rem,3vw,2.4rem);font-weight:800;background:linear-gradient(135deg,#1a56db,#7c3aed);-webkit-background-clip:text;background-clip:text;color:transparent}
.bk-stat span{color:var(--mut);font-size:.9rem;font-weight:600}

.bk-grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.bk-feat{--rx:0deg;--ry:0deg;background:#fff;border:1px solid var(--line);border-radius:22px;padding:26px;transform:perspective(900px) rotateX(var(--rx)) rotateY(var(--ry));transition:transform .18s ease-out,box-shadow .25s;box-shadow:0 8px 28px rgba(15,23,42,.06);position:relative;overflow:hidden}
.bk-feat:hover{box-shadow:0 22px 50px rgba(26,86,219,.18)}
.bk-feat i{width:52px;height:52px;border-radius:15px;display:flex;align-items:center;justify-content:center;font-size:22px;color:#fff;margin-bottom:16px;background:linear-gradient(135deg,#2563eb,#7c3aed);box-shadow:0 10px 22px rgba(37,99,235,.35);transform:translateZ(30px)}
.bk-feat h3{font-size:1.15rem;margin:0 0 6px;font-weight:800}
.bk-feat p{margin:0;color:var(--mut);font-size:.95rem}

.bk-subjects{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px}
.bk-subj{display:flex;align-items:center;gap:12px;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.14);border-radius:14px;padding:13px 15px;transition:transform .2s,background .2s}
.bk-subj:hover{transform:translateY(-4px);background:rgba(255,255,255,.13)}
.bk-subj b{display:grid;place-items:center;min-width:46px;height:38px;border-radius:10px;background:linear-gradient(135deg,var(--gold),var(--gold2));color:#1f2937;font-size:12px}
.bk-subj span{font-size:.92rem;font-weight:600;line-height:1.3}
.bk-subj small{display:block;color:#93a5d8;font-weight:500}

/* ───────── PRICING ───────── */
.bk-plans3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;align-items:stretch}
.bk-plan-card{position:relative;background:#fff;border:1.5px solid var(--line);border-radius:26px;padding:30px 26px;display:flex;flex-direction:column;transition:transform .25s,box-shadow .25s}
.bk-plan-card:hover{transform:translateY(-8px);box-shadow:0 26px 60px rgba(15,23,42,.14)}
.bk-plan-card.hot{background:linear-gradient(165deg,#0a1330,#1d3a8a);color:#fff;border-color:transparent;transform:scale(1.03);box-shadow:0 30px 70px rgba(26,86,219,.4)}
.bk-plan-card.hot:hover{transform:scale(1.03) translateY(-8px)}
.bk-badge{position:absolute;top:-14px;left:50%;transform:translateX(-50%);background:linear-gradient(135deg,var(--gold),var(--gold2));color:#1f2937;font-weight:800;font-size:12px;padding:6px 16px;border-radius:999px;white-space:nowrap}
.bk-plan-card h3{margin:0;font-size:1.25rem;font-weight:800}
.bk-plan-card .amt{font-size:2.6rem;font-weight:800;margin:10px 0 2px;line-height:1}
.bk-plan-card .amt s{font-size:1rem;color:var(--mut);font-weight:600;margin-left:8px}
.bk-plan-card.hot .amt s{color:#93a5d8}
.bk-plan-card ul{list-style:none;margin:16px 0 22px;padding:0;display:grid;gap:9px;flex:1}
.bk-plan-card li{display:flex;gap:9px;font-size:.94rem}
.bk-plan-card li::before{content:"✓";color:var(--ok);font-weight:800}
.bk-plan-card.hot li::before{color:var(--gold)}
.bk-plan-card .bk-btn{width:100%}
.bk-ultra-banner{margin-top:26px;display:flex;flex-wrap:wrap;gap:14px;align-items:center;justify-content:center;text-align:center;background:linear-gradient(135deg,#ede9fe,#e0e7ff);border:1.5px solid #c4b5fd;border-radius:18px;padding:16px 20px;color:#3b0764;font-weight:700}

/* ───────── STEPS / SECURITY / FAQ ───────── */
.bk-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;counter-reset:s}
.bk-step{position:relative;background:#fff;border:1px solid var(--line);border-radius:20px;padding:24px 20px 20px;counter-increment:s}
.bk-step::before{content:counter(s);position:absolute;top:-16px;left:20px;width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,#2563eb,#7c3aed);color:#fff;font-weight:800;display:grid;place-items:center;box-shadow:0 8px 18px rgba(37,99,235,.4)}
.bk-step h4{margin:6px 0 4px;font-size:1.02rem}.bk-step p{margin:0;color:var(--mut);font-size:.92rem}
.bk-secure{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:center}
.bk-secure ul{list-style:none;margin:18px 0 0;padding:0;display:grid;gap:12px}
.bk-secure li{display:flex;gap:12px;align-items:flex-start;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.14);padding:12px 14px;border-radius:14px;font-size:.95rem}
.bk-secure li i{color:var(--gold);margin-top:4px}
.bk-preview{position:relative;border-radius:22px;overflow:hidden;box-shadow:0 30px 70px rgba(0,0,0,.45);transform:perspective(1200px) rotateY(-9deg) rotateX(3deg);transition:transform .5s;background:#fff}
.bk-preview:hover{transform:perspective(1200px) rotateY(0) rotateX(0)}
.bk-preview img{display:block;width:100%}
.bk-faq details{background:#fff;border:1px solid var(--line);border-radius:16px;padding:0 20px;margin-bottom:12px}
.bk-faq summary{cursor:pointer;list-style:none;padding:17px 0;font-weight:700;display:flex;justify-content:space-between;gap:12px}
.bk-faq summary::after{content:"+";font-size:1.4rem;color:var(--blue);line-height:1}
.bk-faq details[open] summary::after{content:"−"}
.bk-faq p{margin:0 0 17px;color:var(--mut)}
.bk-final{background:linear-gradient(135deg,#1a56db,#7c3aed);color:#fff;text-align:center;border-radius:30px;padding:clamp(34px,6vw,64px) 20px;position:relative;overflow:hidden}
.bk-final h2{margin:0 0 10px;font-size:clamp(1.6rem,3.2vw,2.4rem)}
.bk-final p{opacity:.9;margin:0 0 24px}
.bk-disc{color:var(--mut);font-size:.82rem;max-width:860px;margin:26px auto 0;text-align:center}

/* reveal on scroll */
.bk-rev{opacity:0;transform:translateY(34px);transition:opacity .7s ease,transform .7s ease}
.bk-rev.in{opacity:1;transform:none}

/* ───────── MODAL (checkout) ───────── */
body.bk-lock{overflow:hidden}
.bk-modal{position:fixed;inset:0;z-index:100000;background:rgba(5,10,31,.72);backdrop-filter:blur(6px);display:flex;align-items:center;justify-content:center;padding:16px;font-family:'Plus Jakarta Sans',system-ui,sans-serif}
.bk-modal-card{position:relative;width:100%;max-width:480px;max-height:94vh;overflow:auto;background:#fff;color:#0f172a;border-radius:24px;padding:28px 24px 22px;box-shadow:0 40px 90px rgba(0,0,0,.5);animation:bkPop .28s ease}
@keyframes bkPop{from{transform:translateY(24px) scale(.96);opacity:0}}
.bk-modal h3{margin:0;font-size:1.35rem;font-weight:800}.bk-modal .bk-sub{margin:4px 0 16px;color:#64748b;font-size:.9rem}
.bk-x{position:absolute;top:12px;right:14px;border:0;background:#f1f5f9;width:34px;height:34px;border-radius:50%;font-size:1.3rem;cursor:pointer;line-height:1}
.bk-plans{display:grid;gap:10px;margin-bottom:14px}
.bk-plan{display:flex;gap:12px;align-items:center;border:1.5px solid #e2e8f0;border-radius:14px;padding:12px 14px;cursor:pointer}
.bk-plan:has(input:checked){border-color:#1a56db;background:#eff6ff}
.bk-plan span{flex:1;display:flex;flex-direction:column}.bk-plan small{color:#64748b;font-size:.78rem}
.bk-plan em{font-style:normal;font-weight:800;font-size:.95rem}.bk-plan em s{color:#94a3b8;font-weight:500;margin-right:4px}
.bk-coupon{display:flex;gap:8px}.bk-coupon input{flex:1;border:1.5px solid #e2e8f0;border-radius:12px;padding:11px 14px;font:inherit;text-transform:uppercase}
.bk-coupon button{border:0;background:#0f172a;color:#fff;border-radius:12px;padding:0 18px;font-weight:700;cursor:pointer}
.bk-msg{min-height:20px;font-size:.84rem;margin:8px 2px 4px;color:#64748b}.bk-msg.err{color:#dc2626}.bk-msg.good{color:#16a34a}
.bk-rows{background:#f8fafc;border-radius:14px;padding:6px 14px;margin:6px 0 14px}
.bk-rows div{display:flex;justify-content:space-between;padding:8px 0;border-bottom:1px dashed #e2e8f0;font-size:.92rem}.bk-rows div:last-child{border:0}
.bk-rows .ok{color:#16a34a;font-weight:600}.bk-rows .tot{font-weight:800;font-size:1.1rem}
.bk-pay{width:100%;border:0;border-radius:14px;padding:15px;font:inherit;font-weight:800;font-size:1.02rem;color:#fff;cursor:pointer;background:linear-gradient(135deg,#2563eb,#1a56db);box-shadow:0 10px 26px rgba(26,86,219,.35)}
.bk-pay:disabled{opacity:.6}
.bk-fine{font-size:.74rem;color:#94a3b8;margin:10px 0 0;text-align:center}

/* ───────── AUTH PAGE ───────── */
.bk-auth{min-height:70vh;display:grid;grid-template-columns:1fr 1fr;background:#f4f7ff}
.bk-auth-side{background:radial-gradient(900px 500px at 20% 0%,rgba(99,102,241,.35),transparent 60%),radial-gradient(700px 500px at 90% 100%,rgba(245,158,11,.22),transparent 60%),linear-gradient(160deg,#050a1f,#101c48);color:#fff;padding:clamp(28px,4vw,56px);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:20px;position:relative;overflow:hidden;text-align:center}
.bk-auth-side>*{position:relative;z-index:1}
.bk-auth-side::after{content:"";position:absolute;width:420px;height:420px;border-radius:50%;background:radial-gradient(circle,rgba(99,102,241,.45),transparent 65%);top:18%;left:50%;transform:translateX(-50%);filter:blur(20px);z-index:0;animation:bkPulse 5s ease-in-out infinite}
@keyframes bkPulse{0%,100%{opacity:.55;transform:translateX(-50%) scale(1)}50%{opacity:.9;transform:translateX(-50%) scale(1.08)}}
.bk-auth-side img{width:min(250px,62%);height:auto;border-radius:6px 12px 12px 6px;box-shadow:-10px 18px 40px rgba(0,0,0,.55),0 0 0 1px rgba(255,255,255,.08),inset 6px 0 10px rgba(255,255,255,.12);transform:perspective(900px) rotateY(-14deg) rotateX(3deg);transition:transform .5s ease;animation:bkFloatImg 6s ease-in-out infinite}
.bk-auth-side img:hover{transform:perspective(900px) rotateY(-4deg) rotateX(0) scale(1.03)}
@keyframes bkFloatImg{0%,100%{translate:0 0}50%{translate:0 -8px}}
.bk-auth-side h1{font-size:clamp(1.5rem,2.6vw,2.2rem);margin:0;line-height:1.15}
.bk-auth-side ul{list-style:none;padding:0;margin:0;display:grid;gap:9px;width:100%;max-width:380px;text-align:left}
.bk-auth-side li{display:flex;gap:10px;align-items:flex-start;color:#dbe4ff;font-size:.9rem;line-height:1.4;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12);border-radius:12px;padding:10px 12px;backdrop-filter:blur(6px)}
.bk-auth-side li::before{content:"✓";flex:0 0 auto;width:20px;height:20px;border-radius:50%;background:var(--gold,#f59e0b);color:#1b1200;font-weight:800;font-size:.75rem;display:grid;place-items:center;margin-top:1px}
.bk-auth-main{padding:clamp(24px,4vw,56px);display:flex;align-items:center;justify-content:center}
.bk-card{width:100%;max-width:470px;background:#fff;border:1px solid var(--line);border-radius:24px;padding:28px 26px;box-shadow:0 20px 60px rgba(15,23,42,.1)}
.bk-tabs{display:grid;grid-template-columns:1fr 1fr;background:#f1f5f9;border-radius:14px;padding:4px;margin-bottom:20px}
.bk-tabs button{border:0;background:transparent;padding:11px;border-radius:11px;font:inherit;font-weight:700;color:#64748b;cursor:pointer}
.bk-tabs button.on{background:#fff;color:#1a56db;box-shadow:0 3px 10px rgba(15,23,42,.1)}
.bk-field{margin-bottom:13px}.bk-field label{display:block;font-size:.8rem;font-weight:700;color:#475569;margin-bottom:5px}
.bk-field input,.bk-field select{width:100%;border:1.5px solid #e2e8f0;border-radius:12px;padding:12px 14px;font:inherit;background:#fff;color:#0f172a}
.bk-field input:focus,.bk-field select:focus{outline:0;border-color:#1a56db;box-shadow:0 0 0 4px rgba(26,86,219,.12)}
.bk-two{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.bk-check{display:flex;gap:10px;align-items:flex-start;font-size:.82rem;color:#475569;margin:6px 0 14px}.bk-check input{margin-top:3px}
.bk-err{background:#fef2f2;border:1px solid #fecaca;color:#b91c1c;padding:10px 12px;border-radius:12px;font-size:.88rem;margin-bottom:12px;display:none}
.bk-err.show{display:block}
.bk-dev{margin:10px 0;display:grid;gap:8px}.bk-dev label{display:flex;gap:10px;border:1.5px solid #e2e8f0;border-radius:12px;padding:10px 12px;font-size:.88rem;cursor:pointer}
.bk-submit{width:100%;border:0;border-radius:14px;padding:14px;font:inherit;font-weight:800;color:#fff;background:linear-gradient(135deg,#2563eb,#7c3aed);cursor:pointer;box-shadow:0 12px 28px rgba(37,99,235,.35)}
.bk-submit:disabled{opacity:.6}

/* ───────── READER ───────── */
body.bkr{margin:0;background:#0b1020;color:#e5e7eb;font-family:'Plus Jakarta Sans',system-ui,sans-serif;overflow:hidden;height:100vh;-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}
.bkr *{box-sizing:border-box}
.bkr-top{position:fixed;left:0;right:0;top:0;height:56px;z-index:50;display:flex;align-items:center;gap:10px;padding:0 14px;background:rgba(10,16,32,.96);border-bottom:1px solid rgba(255,255,255,.08);backdrop-filter:blur(8px)}
.bkr-top .t{font-weight:800;font-size:.95rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:34vw}
.bkr-top .sp{flex:1}
.bkr-btn{display:inline-flex;align-items:center;gap:7px;border:1px solid rgba(255,255,255,.16);background:rgba(255,255,255,.06);color:#e5e7eb;border-radius:10px;padding:8px 12px;font:inherit;font-weight:600;font-size:.84rem;cursor:pointer;text-decoration:none}
.bkr-btn:hover{background:rgba(255,255,255,.14)}.bkr-btn.gold{background:linear-gradient(135deg,#fbbf24,#f59e0b);color:#1f2937;border:0;font-weight:800}
.bkr-btn:disabled{opacity:.35;cursor:default}
.bkr-page-in{width:62px;text-align:center;background:#0f172a;border:1px solid rgba(255,255,255,.2);border-radius:8px;color:#fff;padding:7px 4px;font:inherit}
.bkr-seg{display:flex;border:1px solid rgba(255,255,255,.16);border-radius:10px;overflow:hidden}
.bkr-seg button{border:0;background:transparent;color:#cbd5e1;padding:8px 12px;font:inherit;font-weight:700;font-size:.82rem;cursor:pointer}.bkr-seg button.on{background:#1a56db;color:#fff}
.bkr-stage{position:fixed;left:0;right:0;top:56px;bottom:0;overflow:auto;display:flex;justify-content:center;padding:18px 10px 80px;scrollbar-width:thin}
.bkr-stage.toc-open{left:320px}
.bkr-canvas-wrap{position:relative;width:fit-content;height:fit-content;margin:auto 0;box-shadow:0 20px 60px rgba(0,0,0,.6);background:#fff}
#bkr-canvas{display:block;background:#fff;max-width:none}
.bkr-load{position:absolute;inset:0;display:grid;place-items:center;background:#fff;color:#334155;font-weight:700}
.bkr-toc{position:fixed;left:0;top:56px;bottom:0;width:320px;transform:translateX(-100%);transition:transform .25s;background:#0f172a;border-right:1px solid rgba(255,255,255,.1);z-index:40;overflow:auto;padding:10px 0 60px}
.bkr-toc.open{transform:none}
.bkr-toc a{display:block;padding:8px 18px;color:#cbd5e1;text-decoration:none;font-size:.84rem;cursor:pointer;line-height:1.35;border-left:3px solid transparent}
.bkr-toc a:hover{background:rgba(255,255,255,.06);color:#fff}
.bkr-toc a.k-section{font-weight:800;color:#fbbf24;margin-top:10px;font-size:.78rem;letter-spacing:.06em;text-transform:uppercase}
.bkr-toc a.k-subject{font-weight:800;color:#fff;border-left-color:#2563eb}
.bkr-toc a.k-chapter{padding-left:32px;color:#94a3b8}
.bkr-toc a.on{background:rgba(37,99,235,.28);color:#fff}
.bkr-toc small{float:right;color:#64748b}
.bkr-foot{position:fixed;left:50%;bottom:14px;transform:translateX(-50%);z-index:45;display:flex;gap:8px;align-items:center;background:rgba(10,16,32,.92);border:1px solid rgba(255,255,255,.12);border-radius:16px;padding:8px 10px;backdrop-filter:blur(8px)}
.bkr-gate{position:fixed;inset:56px 0 0 0;z-index:60;display:none;align-items:center;justify-content:center;padding:20px;background:rgba(5,10,31,.9);text-align:center}
.bkr-gate.show{display:flex}
.bkr-gate .box{max-width:460px;background:#fff;color:#0f172a;border-radius:24px;padding:30px 26px}
.bkr-gate h3{margin:0 0 8px}.bkr-gate p{color:#64748b;margin:0 0 18px}
.bkr-toast{position:fixed;left:50%;top:70px;transform:translateX(-50%);z-index:100001;background:#7f1d1d;color:#fff;border:1px solid #fca5a5;padding:12px 18px;border-radius:14px;font-weight:700;font-size:.9rem;display:none;max-width:90vw;text-align:center}
.bkr-toast.show{display:block}
html.bkr-hide #bkr-canvas,html.bkr-hide .bkr-toc{filter:blur(30px) brightness(.4);pointer-events:none}
#bkr-dt{position:fixed;inset:0;z-index:2147483647;background:#0b1020;color:#fff;display:none;align-items:center;justify-content:center;text-align:center;padding:24px}
#bkr-dt.show{display:flex}
@media print{html,body{display:none!important}}
@media (max-width:900px){
  .bk-hero-grid,.bk-secure,.bk-auth{grid-template-columns:1fr}
  .bk-auth-side{display:none}
  .bk-stats{grid-template-columns:repeat(2,1fr);margin-top:-36px}
  .bk-grid3,.bk-plans3,.bk-steps{grid-template-columns:1fr}
  .bk-plan-card.hot{transform:none}.bk-plan-card.hot:hover{transform:translateY(-8px)}
  .bk3d-stage{height:440px}
  .bk-chip{transform:scale(.85)}
  .bkr-top .t{display:none}
  .bkr-stage.toc-open{left:0}.bkr-toc{width:86vw}
  .bkr-btn span.lbl{display:none}
}
@media (prefers-reduced-motion:reduce){.bk *,.bk3d,.bk3d-float,.bk3d-glow,.bk-chip,.bk-hero::before{animation:none!important}.bk-rev{opacity:1;transform:none}}

[hidden]{display:none!important}

/* Short Notes merged into the book page */
.bk-notes-hint{margin:16px 0 0;color:#dbe4ff;font-size:14.5px;line-height:1.5}
.bk-notes-hint a{color:#fbbf24;font-weight:700}
#short-notes{scroll-margin-top:84px}
.bk-sn-cta{margin:34px auto 0;max-width:720px;padding:26px 22px;border-radius:22px;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.16);text-align:center}
.bk-sn-which{color:#b6c4ee;font-size:.9rem;margin:16px 0 0;line-height:1.6}
.bk-sn-which a{color:#fbbf24}