/* SMI Bookstore — brand tokens taken from smishihab.com */
:root{
  --bg-primary:#0A0E17; --bg-alt:#0F172A; --bg-card:#131C31;
  --cyan:#00D4FF; --magenta:#FF2D95; --purple:#7C3AED;
  --text:#F1F5F9; --text-2:#94A3B8; --muted:#64748B;
  --border:rgba(0,212,255,.15); --shadow-cyan:0 0 20px rgba(0,212,255,.15); --shadow-mag:0 0 20px rgba(255,45,149,.15);
  --ok:#22c55e; --warn:#f59e0b; --bad:#ff4d6d;
  --font-head:'Orbitron','Hind Siliguri',sans-serif; --font-body:'Inter','Hind Siliguri',sans-serif;
  --max:1200px; --nav-h:70px; --tr:all .3s ease; --grad:linear-gradient(135deg,var(--cyan),var(--purple));
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg-primary);color:var(--text);font-family:var(--font-body);font-size:16px;line-height:1.6;min-height:100vh;display:flex;flex-direction:column}
main{flex:1}
a{color:var(--cyan);text-decoration:none;transition:var(--tr)}
a:hover{color:#fff}
img{max-width:100%;display:block}
h1,h2,h3,h4{font-family:var(--font-head);line-height:1.25;color:var(--text)}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}
.muted{color:var(--text-2)}.small{font-size:.85rem}.center{text-align:center}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(10,14,23,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.nav{display:flex;align-items:center;gap:18px;height:var(--nav-h)}
.logo{font-family:var(--font-head);font-weight:900;font-size:1.25rem;color:#fff;letter-spacing:1px;white-space:nowrap}
.logo span{color:var(--cyan)}
.nav-links{display:flex;gap:4px;margin-left:12px;flex:1;flex-wrap:wrap}
.nav-links a{padding:8px 13px;border-radius:8px;color:var(--text-2);font-size:.95rem;font-weight:500}
.nav-links a:hover,.nav-links a.active{color:var(--cyan);background:rgba(0,212,255,.08)}
.nav-right{display:flex;align-items:center;gap:10px}
.search-form{display:flex}
.search-form input{width:170px;background:var(--bg-card);border:1px solid var(--border);border-right:0;color:var(--text);padding:8px 12px;border-radius:8px 0 0 8px;font:inherit;font-size:.9rem}
.search-form button{background:var(--bg-card);border:1px solid var(--border);color:var(--cyan);padding:0 12px;border-radius:0 8px 8px 0;cursor:pointer}
.cart-link{position:relative;padding:8px 14px;border:1px solid var(--border);border-radius:8px;color:var(--text)}
.cart-link b{background:var(--magenta);color:#fff;border-radius:99px;padding:1px 7px;font-size:.75rem;margin-left:6px}
.menu-toggle{display:none;background:none;border:1px solid var(--border);color:var(--text);padding:6px 10px;border-radius:8px;font-size:1.1rem}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 22px;border-radius:10px;border:0;cursor:pointer;font:inherit;font-weight:600;color:#fff;background:var(--grad);transition:var(--tr);box-shadow:var(--shadow-cyan)}
.btn:hover{transform:translateY(-2px);box-shadow:0 6px 26px rgba(124,58,237,.35);color:#fff}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none;box-shadow:none}
.btn-outline{background:transparent;border:1px solid var(--cyan);color:var(--cyan);box-shadow:none}
.btn-outline:hover{background:rgba(0,212,255,.1);color:var(--cyan)}
.btn-mag{background:linear-gradient(135deg,var(--magenta),var(--purple))}
.btn-sm{padding:7px 14px;font-size:.88rem;border-radius:8px}
.btn-danger{background:transparent;border:1px solid var(--bad);color:var(--bad);box-shadow:none}
.btn-danger:hover{background:rgba(255,77,109,.12);color:var(--bad)}
.btn-block{width:100%}

/* hero */
.hero{padding:70px 0 50px;text-align:center;background:radial-gradient(ellipse at 50% 0,rgba(124,58,237,.18),transparent 60%)}
.hero h1{font-size:clamp(2rem,6vw,3.6rem);font-weight:900;letter-spacing:1px}
.hero h1 em{font-style:normal;color:var(--cyan)}
.hero p{max-width:640px;margin:16px auto 26px;color:var(--text-2)}
.hero-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.type-tiles{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:10px 0 10px}
.tile{background:var(--bg-card);border:1px solid var(--border);border-radius:14px;padding:22px;text-align:center;color:var(--text);transition:var(--tr)}
.tile:hover{border-color:var(--cyan);box-shadow:var(--shadow-cyan);transform:translateY(-3px);color:var(--text)}
.tile .ico{font-size:2rem}.tile h3{font-size:1.05rem;margin-top:8px}

/* sections */
.section{padding:36px 0}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:12px;margin-bottom:20px;flex-wrap:wrap}
.section-head h2{font-size:1.4rem}
.section-head h2::after{content:"";display:block;width:54px;height:3px;background:var(--grad);border-radius:3px;margin-top:8px}
.page-title{padding:34px 0 6px}.page-title h1{font-size:1.7rem}
.breadcrumb{font-size:.85rem;color:var(--muted);margin-bottom:6px}

/* product grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:18px}
.card{background:var(--bg-card);border:1px solid var(--border);border-radius:14px;overflow:hidden;display:flex;flex-direction:column;transition:var(--tr)}
.card:hover{border-color:rgba(0,212,255,.45);box-shadow:var(--shadow-cyan);transform:translateY(-3px)}
.cover{aspect-ratio:3/4;background:var(--bg-alt);position:relative;overflow:hidden}
.cover img{width:100%;height:100%;object-fit:cover}
.cover .ph{display:flex;align-items:center;justify-content:center;height:100%;padding:16px;text-align:center;font-family:var(--font-head);font-size:.95rem;background:linear-gradient(160deg,rgba(0,212,255,.12),rgba(124,58,237,.25));color:#fff}
.badge{position:absolute;top:10px;left:10px;font-size:.7rem;padding:3px 9px;border-radius:99px;background:rgba(10,14,23,.85);border:1px solid var(--cyan);color:var(--cyan);font-weight:600}
.badge.ebook{border-color:var(--purple);color:#b79cff}.badge.audiobook{border-color:var(--magenta);color:#ff7cc0}
.badge.sale{left:auto;right:10px;background:var(--magenta);border-color:var(--magenta);color:#fff}
.card-body{padding:12px 14px 14px;display:flex;flex-direction:column;gap:4px;flex:1}
.card-title{font-weight:600;font-size:.97rem;color:var(--text);line-height:1.35}
.card-title:hover{color:var(--cyan)}
.card-sub{font-size:.82rem;color:var(--text-2)}
.price{font-weight:700;color:var(--cyan)}.price s{color:var(--muted);font-weight:400;margin-left:6px;font-size:.85em}
.card-foot{margin-top:auto;padding-top:8px;display:flex;align-items:center;justify-content:space-between;gap:8px}

/* filters */
.toolbar{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:14px 0 20px}
.chip{padding:6px 14px;border-radius:99px;border:1px solid var(--border);color:var(--text-2);font-size:.88rem}
.chip.on,.chip:hover{border-color:var(--cyan);color:var(--cyan);background:rgba(0,212,255,.08)}
select,input[type=text],input[type=tel],input[type=password],input[type=number],input[type=email],input[type=url],textarea,input[type=file]{width:100%;background:var(--bg-alt);border:1px solid rgba(148,163,184,.25);color:var(--text);padding:10px 12px;border-radius:10px;font:inherit;transition:var(--tr)}
select:focus,input:focus,textarea:focus{outline:0;border-color:var(--cyan);box-shadow:0 0 0 3px rgba(0,212,255,.15)}
textarea{min-height:90px;resize:vertical}
.toolbar select{width:auto}
.pager{display:flex;gap:6px;justify-content:center;margin:28px 0;flex-wrap:wrap}
.pager a,.pager span{padding:7px 13px;border:1px solid var(--border);border-radius:8px;color:var(--text-2)}
.pager .cur{background:var(--grad);color:#fff;border-color:transparent}

/* product page */
.product{display:grid;grid-template-columns:340px 1fr;gap:34px;padding:20px 0 30px}
.product .cover{border-radius:16px;border:1px solid var(--border);box-shadow:var(--shadow-mag)}
.product h1{font-size:1.7rem;margin-bottom:6px}
.meta{display:flex;flex-wrap:wrap;gap:6px 18px;color:var(--text-2);font-size:.92rem;margin:8px 0 14px}
.meta b{color:var(--text)}
.big-price{font-size:1.7rem;font-weight:800;color:var(--cyan);margin:10px 0}
.big-price s{font-size:1rem;color:var(--muted);font-weight:400;margin-left:8px}
.variants{display:flex;gap:10px;flex-wrap:wrap;margin:10px 0 16px}
.variant{cursor:pointer}
.variant input{position:absolute;opacity:0}
.variant span{display:block;padding:10px 16px;border:1px solid rgba(148,163,184,.3);border-radius:10px;background:var(--bg-card);font-size:.92rem;transition:var(--tr)}
.variant input:checked+span{border-color:var(--cyan);box-shadow:var(--shadow-cyan);background:rgba(0,212,255,.08)}
.variant input:disabled+span{opacity:.4;text-decoration:line-through;cursor:not-allowed}
.variant small{display:block;color:var(--text-2)}
.buy-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:14px}
.qty{display:inline-flex;border:1px solid var(--border);border-radius:10px;overflow:hidden}
.qty button{background:var(--bg-card);border:0;color:var(--text);width:38px;cursor:pointer;font-size:1.1rem}
.qty input{width:52px;text-align:center;border:0;border-radius:0;background:var(--bg-alt);padding:8px 0}
.tabs{margin-top:10px}
.panel{background:var(--bg-card);border:1px solid var(--border);border-radius:14px;padding:20px;margin-bottom:20px}
.panel h3{font-size:1.05rem;margin-bottom:12px}
.video{aspect-ratio:16/9;border-radius:12px;overflow:hidden;background:#000}
.video iframe{width:100%;height:100%;border:0}
.pdf-frame{width:100%;height:560px;border:1px solid var(--border);border-radius:12px;background:#fff}
.desc{white-space:pre-line;color:var(--text-2)}
.stock-ok{color:var(--ok)}.stock-out{color:var(--bad)}

/* cart & checkout */
.layout-2{display:grid;grid-template-columns:1fr 380px;gap:24px;align-items:start;padding:10px 0 40px}
.line{display:grid;grid-template-columns:64px 1fr auto;gap:14px;align-items:center;padding:14px 0;border-bottom:1px solid rgba(148,163,184,.12)}
.line:last-child{border:0}
.line .thumb{width:64px;aspect-ratio:3/4;border-radius:8px;overflow:hidden;background:var(--bg-alt)}
.line .thumb img{width:100%;height:100%;object-fit:cover}
.sum-row{display:flex;justify-content:space-between;padding:6px 0;color:var(--text-2)}
.sum-row.total{color:var(--text);font-weight:800;font-size:1.15rem;border-top:1px solid rgba(148,163,184,.2);margin-top:8px;padding-top:12px}
.field{margin-bottom:16px}
.field label{display:block;font-size:.9rem;color:var(--text-2);margin-bottom:6px;font-weight:500}
.field .hint{font-size:.82rem;margin-top:6px;min-height:1.2em}
.field.ok input,.field.ok textarea{border-color:var(--ok)}
.field.err input,.field.err textarea{border-color:var(--bad)}
.field.ok .hint{color:var(--ok)}.field.err .hint{color:var(--bad)}
.radio-row{display:flex;gap:12px;flex-wrap:wrap}
.radio-row label{flex:1;min-width:140px;padding:12px 14px;border:1px solid rgba(148,163,184,.3);border-radius:10px;cursor:pointer;color:var(--text);display:flex;gap:8px;align-items:center}
.radio-row input{width:auto}
.ai-badge{display:inline-flex;gap:6px;align-items:center;font-size:.78rem;color:var(--cyan);border:1px solid var(--border);padding:3px 10px;border-radius:99px;background:rgba(0,212,255,.06);margin-bottom:14px}
.ai-badge i{width:7px;height:7px;border-radius:50%;background:var(--ok);box-shadow:0 0 8px var(--ok)}

/* flash, tables */
.flash{padding:12px 16px;border-radius:10px;margin:16px 0;border:1px solid}
.flash.ok{border-color:var(--ok);background:rgba(34,197,94,.08);color:#9be8b4}
.flash.err{border-color:var(--bad);background:rgba(255,77,109,.08);color:#ffb3c0}
table.t{width:100%;border-collapse:collapse;font-size:.92rem}
table.t th{text-align:left;color:var(--text-2);font-weight:600;padding:10px 12px;border-bottom:1px solid var(--border);white-space:nowrap}
table.t td{padding:10px 12px;border-bottom:1px solid rgba(148,163,184,.1);vertical-align:top}
table.t tr:hover td{background:rgba(0,212,255,.03)}
.tbl-wrap{overflow-x:auto}
.pill{display:inline-block;padding:2px 11px;border-radius:99px;font-size:.78rem;font-weight:600;border:1px solid}
.pill.pending{color:var(--warn);border-color:var(--warn)}.pill.confirm{color:var(--cyan);border-color:var(--cyan)}
.pill.packaging{color:#b79cff;border-color:#b79cff}.pill.courier{color:#ff7cc0;border-color:#ff7cc0}.pill.delivered{color:var(--ok);border-color:var(--ok)}
.pill.incomplete{color:var(--bad);border-color:var(--bad)}

/* footer */
.site-footer{margin-top:50px;border-top:1px solid var(--border);padding:30px 0;color:var(--muted);font-size:.9rem}
.foot{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}

@media(max-width:900px){
  .product{grid-template-columns:1fr}.product .cover{max-width:300px}
  .layout-2{grid-template-columns:1fr}
  .type-tiles{grid-template-columns:1fr}
  .menu-toggle{display:block}
  .nav{flex-wrap:wrap;height:auto;padding:12px 0}
  .nav-links{display:none;order:5;width:100%;margin:0}
  .nav-links.open{display:flex}
  .nav-right{margin-left:auto}
  .search-form{display:none}
}
@media(max-width:520px){.grid{grid-template-columns:repeat(2,1fr);gap:12px}.hero{padding:44px 0 30px}}