:root{
  --ink:#22302e; --teal-deep:#173534; --teal:#24504e; --teal-soft:#e7efee;
  --gold:#b0852f; --gold-bright:#d9a842; --paper:#faf7f0; --card:#fff;
  --muted:#68766f; --radius:16px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}
body{font-family:'Hind Siliguri',sans-serif;background:var(--paper);color:var(--ink);line-height:1.8;padding-bottom:84px}
.wrap{max-width:520px;margin:0 auto;padding:0 20px}
h1,h2,h3{font-family:'Noto Serif Bengali',serif;line-height:1.5}

.hero{background:linear-gradient(165deg,#14302f 0%,#24504e 60%,#2e6360 100%);color:#f3eee3;padding:40px 0 48px;text-align:center;overflow:hidden}
.badge{display:inline-block;font-size:.8rem;font-weight:600;letter-spacing:.06em;color:var(--teal-deep);background:var(--gold-bright);padding:5px 14px;border-radius:999px;margin-bottom:18px}
.hero h1{font-size:clamp(1.7rem,6.4vw,2.3rem);font-weight:900;margin-bottom:12px}
.hero .sub{font-size:1rem;color:#d8e3e0;max-width:38ch;margin:0 auto 30px}

.book-scene{perspective:900px;margin-bottom:30px}
.book{display:inline-block;width:190px;height:265px;border-radius:4px 10px 10px 4px;
  background:linear-gradient(160deg,#1a3a3a 0%,#24504e 55%,#2e6360 100%);
  transform:rotateY(-14deg) rotateX(2deg);
  box-shadow:-6px 0 0 -2px #0e2423,18px 24px 40px rgba(10,25,24,.55),inset -3px 0 8px rgba(255,255,255,.06);
  text-align:right;padding:26px 18px;position:relative;animation:float 5s ease-in-out infinite}
@keyframes float{0%,100%{transform:rotateY(-14deg) rotateX(2deg) translateY(0)}50%{transform:rotateY(-14deg) rotateX(2deg) translateY(-8px)}}
.book .b-kicker{font-size:.62rem;color:var(--gold-bright);border-bottom:1px solid var(--gold-bright);display:inline-block;padding-bottom:3px;margin-bottom:14px;letter-spacing:.1em}
.book .b-title{font-family:'Noto Serif Bengali',serif;font-weight:900;font-size:1.2rem;line-height:1.5;color:#f5efe6;margin-bottom:10px}
.book .b-sub{font-size:.6rem;color:#cfdbd8;line-height:1.7}
.book .b-foot{position:absolute;bottom:16px;left:18px;right:18px;border-top:1px solid rgba(245,239,230,.3);padding-top:8px;font-size:.55rem;color:#b9c9c6;text-align:right}

.price-line{margin-bottom:20px}
.price-old{color:#9db4b1;text-decoration:line-through;font-size:1rem;margin-left:10px}
.price-now{font-family:'Noto Serif Bengali',serif;font-size:2rem;font-weight:900;color:var(--gold-bright)}
.btn{display:inline-block;font-family:'Hind Siliguri',sans-serif;font-size:1.05rem;font-weight:700;
  background:var(--gold-bright);color:var(--teal-deep);padding:14px 38px;border:none;border-radius:999px;
  cursor:pointer;box-shadow:0 6px 18px rgba(217,168,66,.35);transition:transform .15s,box-shadow .15s;text-decoration:none}
.btn:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(217,168,66,.45)}
.btn:focus-visible{outline:3px solid #fff;outline-offset:3px}
.trust{display:flex;justify-content:center;flex-wrap:wrap;gap:8px;margin-top:22px}
.chip{font-size:.78rem;color:#d8e3e0;border:1px solid rgba(216,227,224,.35);padding:4px 12px;border-radius:999px}

section{padding:44px 0}
.eyebrow{font-size:.78rem;font-weight:700;letter-spacing:.12em;color:var(--gold);text-transform:uppercase;margin-bottom:8px}
h2{font-size:1.45rem;font-weight:700;color:var(--teal-deep);margin-bottom:18px}

.pain{background:var(--card)}
.pain-item{display:flex;gap:12px;align-items:flex-start;padding:14px 0;border-bottom:1px dashed #e2ddd0}
.pain-item:last-child{border-bottom:none}
.pain-item .q{flex:0 0 auto;width:30px;height:30px;border-radius:50%;background:var(--teal-soft);color:var(--teal);font-weight:700;display:flex;align-items:center;justify-content:center;font-size:.95rem}
.pain-item p{font-size:.97rem;color:#3d4a47}

.chapters li{list-style:none;background:var(--card);border:1px solid #ece6d8;border-radius:var(--radius);padding:13px 16px;margin-bottom:10px;display:flex;gap:12px;align-items:baseline;font-size:.95rem}
.chapters .no{font-family:'Noto Serif Bengali',serif;color:var(--gold);font-weight:700;font-size:.9rem;flex:0 0 auto}

.cred{background:var(--teal-deep);color:#e9f0ee}
.cred .eyebrow{color:var(--gold-bright)}
.cred h2{color:#fff}
.cred-card{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.15);border-radius:var(--radius);padding:18px;margin-bottom:12px;font-size:.95rem}
.cred-card b{color:var(--gold-bright)}

.price-card{background:linear-gradient(165deg,#1a3a3a,#2e6360);color:#f3eee3;border-radius:22px;padding:30px 24px;text-align:center;box-shadow:0 16px 40px rgba(20,48,47,.3)}
.guarantee{font-size:.83rem;color:#cfdbd8;margin-top:14px}
.order-form input{width:100%;padding:13px 16px;margin-bottom:12px;border:none;border-radius:12px;font-family:'Hind Siliguri',sans-serif;font-size:1rem;background:#fff;color:var(--ink)}
.order-form input:focus{outline:3px solid var(--gold-bright)}
.alert{background:#fde8e8;color:#9b1c1c;border-radius:12px;padding:12px 16px;font-size:.92rem;margin-bottom:14px}

details{background:var(--card);border:1px solid #ece6d8;border-radius:var(--radius);margin-bottom:10px;overflow:hidden}
summary{cursor:pointer;font-weight:600;font-size:.98rem;padding:15px 18px;list-style:none!important;position:relative;color:var(--teal-deep);display:flex;align-items:center;justify-content:space-between;gap:14px}
summary::-webkit-details-marker{display:none!important}
summary::marker{content:"";font-size:0}
.faq-question{display:block;min-width:0;flex:1}
.faq-icon{position:relative;display:block;flex:0 0 24px;width:24px;height:24px;margin-left:auto;border-radius:50%;background:var(--teal-soft)}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;left:50%;top:50%;width:10px;height:2px;border-radius:2px;background:var(--gold);transform:translate(-50%,-50%)}
.faq-icon::after{transform:translate(-50%,-50%) rotate(90deg);transition:transform .18s ease}
details[open] .faq-icon::after{transform:translate(-50%,-50%) rotate(0deg)}
details .ans{padding:0 18px 16px;font-size:.93rem;color:#4a5754}

footer{background:#101f1e;color:#8fa39f;font-size:.8rem;text-align:center;padding:28px 20px;line-height:1.9}

.buybar{position:fixed;bottom:0;left:0;right:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-top:1px solid #e5dfd1;padding:12px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.buybar .p{font-family:'Noto Serif Bengali',serif;font-weight:900;font-size:1.25rem;color:var(--teal-deep)}
.buybar .p small{font-size:.75rem;color:var(--muted);font-weight:400;display:block;line-height:1.3}
.buybar .btn{padding:11px 26px;font-size:.98rem}

/* status pages */
.status-page{min-height:70vh;display:flex;align-items:center;justify-content:center;padding:40px 20px}
.status-card{background:var(--card);border-radius:22px;padding:36px 28px;max-width:440px;text-align:center;box-shadow:0 14px 40px rgba(20,48,47,.12)}
.status-card .icon{font-size:3rem;margin-bottom:12px}
.status-card h1{font-size:1.5rem;color:var(--teal-deep);margin-bottom:10px}
.status-card p{font-size:.95rem;color:#4a5754;margin-bottom:10px}
.dl-box{background:var(--teal-soft);border-radius:14px;padding:14px;margin:18px 0;font-size:.88rem;word-break:break-all}

@media(min-width:640px){.wrap{max-width:640px}.buybar{justify-content:center;gap:40px}}
*{-webkit-tap-highlight-color:transparent}
button,a,input,select,textarea{outline:none}
button:focus:not(:focus-visible),a:focus:not(:focus-visible){outline:none;box-shadow:none}
.order-submit{position:relative;min-height:54px}
.order-submit:disabled{cursor:not-allowed;opacity:.82;transform:none!important}
.btn-spinner{display:none;width:19px;height:19px;border:2px solid rgba(23,53,52,.28);border-top-color:var(--teal-deep);border-radius:50%;margin-left:10px;vertical-align:middle;animation:spin .75s linear infinite}
.order-submit.loading .btn-spinner{display:inline-block}.order-submit.loading{display:flex;align-items:center;justify-content:center}
@keyframes spin{to{transform:rotate(360deg)}}
.transaction-card{background:#f4f8f7;border:1px solid #dce9e7;border-radius:14px;padding:14px;margin:16px 0;display:flex;flex-direction:column;gap:3px}.transaction-card span{font-size:.78rem;color:var(--muted)}.transaction-card strong{font-size:1rem;color:var(--teal-deep);word-break:break-all}.transaction-card small{color:var(--muted)}
.text-link{color:var(--teal);font-weight:700}.back-link{display:block;margin-top:16px;font-size:.88rem;color:var(--muted)}
.limit-card{max-width:460px}.limit-icon{width:68px;height:68px;border-radius:22px;background:#fff1db;color:#9a6500;display:grid;place-items:center;font-size:2rem;font-weight:700;margin:0 auto 16px}.whatsapp-btn{background:#1e9e5a;color:#fff;box-shadow:none;margin-top:12px}
@media(max-width:480px){.status-page{padding:20px 14px;min-height:100vh}.status-card{padding:28px 18px;border-radius:18px;width:100%}.status-card .btn{width:100%;padding-left:18px;padding-right:18px}}

/* interaction reset and global toast */
html,body,*{-webkit-tap-highlight-color:rgba(0,0,0,0)!important}
a,button,[role="button"],summary,.btn{-webkit-appearance:none!important;appearance:none!important;touch-action:manipulation;user-select:none;-webkit-user-select:none}
a:focus,a:focus-visible,a:active,button:focus,button:focus-visible,button:active,.btn:focus,.btn:focus-visible,.btn:active,summary:focus,summary:focus-visible,summary:active{outline:0!important;outline-offset:0!important;box-shadow:none!important;filter:none!important}
.btn:active{transform:none!important}
@media(hover:none),(pointer:coarse){.btn:hover{transform:none;box-shadow:0 6px 18px rgba(217,168,66,.35)}}
.toast-stack{position:fixed;top:max(14px,env(safe-area-inset-top));right:14px;z-index:99999;width:min(360px,calc(100vw - 28px));pointer-events:none}
.app-toast{display:flex;align-items:center;gap:10px;background:#fff;color:#173534;border:1px solid #dbe6e3;border-radius:13px;padding:12px 14px;margin-bottom:8px;box-shadow:0 16px 36px rgba(15,35,34,.18);font-size:.9rem;font-weight:600;animation:toastIn .2s ease both}
.app-toast .toast-icon{width:28px;height:28px;flex:0 0 28px;border-radius:9px;display:grid;place-items:center;background:#e7efee;color:#24504e}
.app-toast.error .toast-icon{background:#fde8e8;color:#a52a2a}
.app-toast.out{animation:toastOut .2s ease both}
@keyframes toastIn{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:none}}
@keyframes toastOut{to{opacity:0;transform:translateY(-8px)}}

/* Keep the footer fully visible above the fixed purchase bar */
:root{--buybar-space:96px}
body{padding-bottom:calc(var(--buybar-space) + env(safe-area-inset-bottom,0px))!important}
footer{position:relative;z-index:1;margin-bottom:0}
.buybar{padding-bottom:calc(12px + env(safe-area-inset-bottom,0px));min-height:var(--buybar-space)}
@media(max-width:480px){:root{--buybar-space:104px}}

/* Floating support */
.support-float{position:fixed;right:18px;bottom:calc(var(--buybar-space) + 18px + env(safe-area-inset-bottom,0px));z-index:70}
.support-toggle{width:56px;height:56px;border:0;border-radius:18px;background:#1f9d59;color:#fff;display:grid;place-items:center;box-shadow:0 14px 30px rgba(20,48,47,.25);cursor:pointer;padding:0}
.support-toggle svg,.support-whatsapp svg{width:27px;height:27px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.support-card{position:absolute;right:0;bottom:68px;width:min(330px,calc(100vw - 28px));padding:20px;background:#fff;border:1px solid #dfe8e5;border-radius:18px;box-shadow:0 22px 54px rgba(20,48,47,.22);opacity:0;visibility:hidden;transform:translateY(8px) scale(.98);transform-origin:bottom right;transition:.18s ease}
.support-float.open .support-card{opacity:1;visibility:visible;transform:none}
.support-close{position:absolute;right:10px;top:10px;width:34px;height:34px;border:0;border-radius:10px;background:#f1f5f4;color:var(--teal-deep);display:grid;place-items:center;cursor:pointer;padding:0}
.support-close svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round}
.support-head{font-family:'Noto Serif Bengali',serif;font-weight:900;font-size:1.15rem;color:var(--teal-deep);padding-right:36px}
.support-text{font-size:.88rem;color:var(--muted);line-height:1.55;margin:7px 0 12px}
.support-email{display:block;color:var(--teal);font-size:.84rem;font-weight:700;word-break:break-all;margin-bottom:12px}
.support-whatsapp{display:flex;align-items:center;justify-content:center;gap:9px;background:#1f9d59;color:#fff;border-radius:12px;padding:12px 14px;font-weight:700;font-size:.92rem}
.support-whatsapp svg{width:20px;height:20px}
@media(max-width:480px){.support-float{right:14px;bottom:calc(var(--buybar-space) + 12px + env(safe-area-inset-bottom,0px))}.support-toggle{width:52px;height:52px;border-radius:16px}.support-card{bottom:62px}}