/* ============================================================
   IOKUOK Auto Supply — Design System
   โทน: พรีเมียม เหลือง-ดำ-ขาว / อุตสาหกรรมยานยนต์
   ลายเซ็น: เส้น hazard-stripe เหลืองดำ ใช้อย่างมีวินัย
   ============================================================ */
:root{
  --paper:#ffffff; --ink:#14161a; --smoke:#f5f6f8; --card:#ffffff;
  --line:#e6e8ec; --muted:#68707c;
  --brand:#f7b500; --brand-strong:#e0a300; --on-brand:#171308;
  --ok:#1f9d55; --bad:#d64545;
  --radius:14px; --shadow:0 10px 30px rgba(20,22,26,.08);
  --hazard:repeating-linear-gradient(-45deg,var(--brand) 0 10px,var(--ink) 10px 20px);
}
@media (prefers-color-scheme:dark){
  :root{
    --paper:#13151a; --ink:#f2f4f7; --smoke:#1a1d24; --card:#1c2028;
    --line:#2a2f39; --muted:#98a1ad; --shadow:0 10px 30px rgba(0,0,0,.35);
  }
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Prompt',-apple-system,'Segoe UI',sans-serif;
  background:var(--paper); color:var(--ink);
  font-size:16px; line-height:1.65; -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit}
:focus-visible{outline:3px solid var(--brand);outline-offset:2px;border-radius:4px}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
.hazard{height:6px;background:var(--hazard)}

/* ---------- Header ---------- */
.site-head{position:sticky;top:0;z-index:50;background:var(--paper);border-bottom:1px solid var(--line)}
.head-in{display:flex;align-items:center;gap:14px;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:19px;letter-spacing:.02em}
.logo .mark{width:34px;height:34px;border-radius:8px;background:var(--brand);color:var(--on-brand);
  display:grid;place-items:center;font-weight:700;font-size:15px}
.logo small{display:block;font-size:10.5px;font-weight:500;color:var(--muted);letter-spacing:.14em;line-height:1}
nav.main{display:flex;gap:2px;margin-left:auto}
nav.main a{padding:8px 12px;border-radius:8px;font-size:14.5px;color:var(--muted);font-weight:500}
nav.main a:hover{color:var(--ink);background:var(--smoke)}
nav.main a.on{color:var(--ink);font-weight:600;box-shadow:inset 0 -3px 0 var(--brand)}
.head-tools{display:flex;align-items:center;gap:8px;margin-left:8px}
.lang-tg{border:1px solid var(--line);background:var(--smoke);border-radius:999px;padding:5px 12px;
  font-size:13px;font-weight:600;cursor:pointer;color:var(--ink)}
.cart-btn{position:relative;border:none;background:var(--ink);color:var(--paper);border-radius:10px;
  padding:8px 13px;font-size:14px;font-weight:600;cursor:pointer;display:flex;gap:7px;align-items:center}
.cart-btn .n{background:var(--brand);color:var(--on-brand);border-radius:999px;font-size:11.5px;
  min-width:19px;height:19px;display:grid;place-items:center;font-weight:700;padding:0 4px}
.burger{display:none;border:1px solid var(--line);background:var(--paper);color:var(--ink);border-radius:10px;
  width:40px;height:40px;font-size:18px;cursor:pointer}
@media(max-width:900px){
  nav.main{display:none;position:fixed;inset:64px 0 auto 0;background:var(--paper);flex-direction:column;
    padding:10px 20px 18px;border-bottom:1px solid var(--line);box-shadow:var(--shadow)}
  nav.main.open{display:flex}
  nav.main a{padding:12px;font-size:16px}
  .burger{display:block}
}

/* ---------- Buttons / badges ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;cursor:pointer;
  border-radius:12px;padding:13px 22px;font-size:15.5px;font-weight:600;transition:transform .12s}
.btn:active{transform:scale(.98)}
.btn-brand{background:var(--brand);color:var(--on-brand)}
.btn-brand:hover{background:var(--brand-strong)}
.btn-ink{background:var(--ink);color:var(--paper)}
.btn-ghost{background:transparent;border:1.5px solid var(--line);color:var(--ink)}
.btn-line{background:#06c755;color:#fff}
.btn[disabled]{opacity:.5;cursor:not-allowed}
.badge{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:600;
  background:var(--smoke);border:1px solid var(--line);border-radius:999px;padding:4px 11px;color:var(--muted)}
.badge.brand{background:color-mix(in srgb,var(--brand) 18%,transparent);border-color:var(--brand);color:var(--ink)}

/* ---------- Sections ---------- */
.eyebrow{font-size:12.5px;font-weight:700;letter-spacing:.18em;text-transform:uppercase;color:var(--brand-strong)}
h1.display{font-size:clamp(30px,5vw,52px);font-weight:700;line-height:1.18;letter-spacing:-.01em}
h2.sec{font-size:clamp(22px,3vw,30px);font-weight:700;line-height:1.3}
.lead{color:var(--muted);font-size:clamp(15px,1.6vw,17.5px);max-width:60ch}
section.block{padding:64px 0}
section.block.tint{background:var(--smoke)}
.sec-head{margin-bottom:30px;display:grid;gap:8px}

/* ---------- Hero ---------- */
.hero{background:
  radial-gradient(1000px 400px at 85% -10%, color-mix(in srgb,var(--brand) 22%,transparent), transparent 60%),
  var(--paper);
  padding:72px 0 56px;border-bottom:1px solid var(--line);position:relative;overflow:hidden}
.hero .grid{display:grid;gap:36px;grid-template-columns:1.15fr .85fr;align-items:center}
.hero-art{aspect-ratio:4/3;border-radius:20px;background:var(--smoke);border:1px solid var(--line);
  display:grid;place-items:center;position:relative;overflow:hidden}
.hero-art::before{content:'';position:absolute;inset:auto 0 0 0;height:8px;background:var(--hazard)}
.stats{display:flex;gap:26px;margin-top:28px;flex-wrap:wrap}
.stat b{font-size:clamp(24px,3vw,34px);font-weight:700;display:block;line-height:1.1}
.stat span{font-size:13px;color:var(--muted)}
@media(max-width:820px){.hero .grid{grid-template-columns:1fr}.hero{padding:44px 0 40px}}

/* ---------- Trust icons (ลูกเล่นประจำแบรนด์) ---------- */
.trust{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.trust .t{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;
  display:flex;gap:13px;align-items:center}
.trust .ico{width:44px;height:44px;flex:none;border-radius:11px;background:var(--ink);color:var(--brand);
  display:grid;place-items:center;font-size:20px}
.trust b{font-size:14.5px;display:block}
.trust span{font-size:12.5px;color:var(--muted)}
@media(max-width:760px){.trust{grid-template-columns:1fr}}

/* ---------- Cards / product grid ---------- */
.grid-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:18px}
.pcard{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  display:flex;flex-direction:column;transition:transform .15s,box-shadow .15s}
.pcard:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.pcard .ph{aspect-ratio:1/1;background:var(--smoke);display:grid;place-items:center;position:relative}
.pcard .ph img{width:100%;height:100%;object-fit:cover}
.pcard .ph .sku{position:absolute;left:10px;top:10px;background:var(--ink);color:var(--paper);
  font-size:11px;font-weight:600;border-radius:6px;padding:3px 8px;letter-spacing:.04em}
.pcard .body{padding:14px 15px 16px;display:grid;gap:6px;flex:1}
.pcard h3{font-size:15.5px;font-weight:600;line-height:1.4}
.pcard .meta{font-size:12.5px;color:var(--muted)}
.price{font-size:18px;font-weight:700}
.price small{font-size:11.5px;color:var(--muted);font-weight:500}
.price .was{font-size:13px;color:var(--muted);text-decoration:line-through;font-weight:400;margin-left:7px}
.wholesale-tag{color:var(--ok);font-size:12px;font-weight:600}

/* ---------- Fitment search bar ---------- */
.fitbar{background:var(--ink);border-radius:18px;padding:22px;color:var(--paper);position:relative;overflow:hidden}
.fitbar::before{content:'';position:absolute;inset:0 0 auto 0;height:6px;background:var(--hazard)}
.fitbar .row{display:grid;grid-template-columns:1fr 1fr 1fr auto;gap:10px;margin-top:14px}
.fitbar label{font-size:13px;font-weight:600;color:#cfd4dc}
select,input[type=text],input[type=tel],input[type=email],input[type=password],input[type=number],textarea{
  width:100%;font-family:'Prompt',sans-serif;font-size:16px;background:var(--card);color:var(--ink);
  border:1.5px solid var(--line);border-radius:11px;padding:12px 13px}
.fitbar select{background:#fff;color:#14161a}
@media (prefers-color-scheme:dark){.fitbar select{background:#242a34;color:var(--ink)}}
select:focus,input:focus,textarea:focus{outline:none;border-color:var(--brand)}
textarea{resize:vertical;min-height:90px}
@media(max-width:760px){.fitbar .row{grid-template-columns:1fr}}

/* ---------- Forms ---------- */
.form{display:grid;gap:14px;max-width:560px}
.form label{font-size:13.5px;font-weight:600;display:grid;gap:6px}
.form .hint{font-size:12.5px;color:var(--muted);font-weight:400}
.msg{border-radius:11px;padding:12px 14px;font-size:14px;display:none}
.msg.err{display:block;background:color-mix(in srgb,var(--bad) 12%,transparent);color:var(--bad);border:1px solid var(--bad)}
.msg.ok{display:block;background:color-mix(in srgb,var(--ok) 12%,transparent);color:var(--ok);border:1px solid var(--ok)}

/* ---------- Tables ---------- */
.tbl{width:100%;border-collapse:collapse;font-size:14.5px}
.tbl th{font-size:12.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);
  text-align:left;padding:10px 12px;border-bottom:2px solid var(--line)}
.tbl td{padding:12px;border-bottom:1px solid var(--line);vertical-align:middle}

/* ---------- Detail page ---------- */
.pd{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.pd .ph{aspect-ratio:1/1;background:var(--smoke);border:1px solid var(--line);border-radius:18px;
  display:grid;place-items:center;overflow:hidden}
.pd .ph img{width:100%;height:100%;object-fit:cover}
.spec{display:grid;gap:0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.spec .r{display:grid;grid-template-columns:130px 1fr;font-size:14.5px}
.spec .r:nth-child(odd){background:var(--smoke)}
.spec .k{padding:11px 14px;font-weight:600;color:var(--muted);font-size:13px}
.spec .v{padding:11px 14px}
.qty{display:flex;align-items:center;gap:0;border:1.5px solid var(--line);border-radius:11px;overflow:hidden;width:max-content}
.qty button{width:42px;height:46px;border:none;background:var(--smoke);font-size:19px;cursor:pointer;color:var(--ink)}
.qty input{width:60px;border:none;text-align:center;font-size:16px;font-weight:600;background:var(--card);color:var(--ink)}
@media(max-width:820px){.pd{grid-template-columns:1fr}}

/* ---------- FAQ ---------- */
details.faq{border:1px solid var(--line);border-radius:12px;background:var(--card);margin-bottom:10px}
details.faq summary{padding:15px 18px;font-weight:600;cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:10px}
details.faq summary::after{content:'+';font-size:19px;color:var(--brand-strong);font-weight:700}
details.faq[open] summary::after{content:'–'}
details.faq .a{padding:0 18px 16px;color:var(--muted);font-size:14.5px}

/* ---------- Footer ---------- */
footer.site{background:var(--ink);color:#c9ced6;margin-top:70px}
footer.site .top{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:30px;padding:46px 0 36px}
footer.site h4{color:#fff;font-size:14px;margin-bottom:12px;letter-spacing:.04em}
footer.site a{display:block;font-size:13.5px;padding:4px 0;color:#c9ced6}
footer.site a:hover{color:var(--brand)}
footer.site .brandline{font-size:13.5px;line-height:1.8}
footer.site .bottom{border-top:1px solid #2b303a;padding:16px 0;font-size:12.5px;color:#8d94a0;
  display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}
@media(max-width:820px){footer.site .top{grid-template-columns:1fr 1fr}}

/* ---------- Floating buttons ---------- */
.floaters{position:fixed;right:16px;bottom:16px;z-index:60;display:grid;gap:10px}
.fab{width:54px;height:54px;border-radius:999px;display:grid;place-items:center;font-size:22px;
  box-shadow:var(--shadow);cursor:pointer;border:none;color:#fff}
.fab.line{background:#06c755}
.fab.call{background:var(--ink);color:var(--brand)}

/* ---------- Popups ---------- */
.overlay{position:fixed;inset:0;background:rgba(10,12,16,.55);z-index:80;display:none;place-items:center;padding:20px}
.overlay.show{display:grid}
.modal{background:var(--card);border-radius:18px;max-width:430px;width:100%;padding:26px;position:relative;
  border-top:6px solid var(--brand)}
.modal .x{position:absolute;right:12px;top:10px;border:none;background:none;font-size:22px;cursor:pointer;color:var(--muted)}

/* พนักงานขายอัจฉริยะ */
.assistant{position:fixed;right:16px;bottom:86px;z-index:70;max-width:330px;width:calc(100% - 32px);
  background:var(--card);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);
  transform:translateY(16px);opacity:0;pointer-events:none;transition:all .3s ease}
.assistant.show{transform:none;opacity:1;pointer-events:auto}
.assistant .head{display:flex;gap:10px;align-items:center;padding:13px 15px;border-bottom:1px solid var(--line)}
.assistant .avatar{width:36px;height:36px;border-radius:999px;background:var(--brand);color:var(--on-brand);
  display:grid;place-items:center;font-weight:700;font-size:15px;flex:none}
.assistant .head b{font-size:14px;display:block;line-height:1.2}
.assistant .head span{font-size:11.5px;color:var(--ok);font-weight:600}
.assistant .head .x{margin-left:auto;border:none;background:none;font-size:19px;color:var(--muted);cursor:pointer}
.assistant .bubble{margin:13px 15px;background:var(--smoke);border-radius:4px 14px 14px 14px;padding:12px 14px;font-size:14px;line-height:1.6}
.assistant .acts{display:flex;gap:8px;padding:0 15px 15px;flex-wrap:wrap}
.assistant .acts .btn{padding:9px 14px;font-size:13.5px;border-radius:9px}

.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%) translateY(16px);z-index:90;
  background:var(--ink);color:var(--paper);font-size:14px;font-weight:600;padding:11px 20px;border-radius:999px;
  opacity:0;pointer-events:none;transition:all .25s}
.toast.show{opacity:1;transform:translateX(-50%)}

/* ---------- Cart / checkout ---------- */
.cart-line{display:grid;grid-template-columns:74px 1fr auto;gap:14px;align-items:center;
  padding:14px 0;border-bottom:1px solid var(--line)}
.cart-line .ph{width:74px;height:74px;border-radius:11px;background:var(--smoke);overflow:hidden;display:grid;place-items:center}
.cart-line .ph img{width:100%;height:100%;object-fit:cover}
.summary{background:var(--smoke);border:1px solid var(--line);border-radius:var(--radius);padding:20px;display:grid;gap:9px;height:max-content}
.summary .r{display:flex;justify-content:space-between;font-size:14.5px}
.summary .r.total{font-size:18px;font-weight:700;border-top:1.5px solid var(--line);padding-top:10px}
.two-col{display:grid;grid-template-columns:1.4fr .8fr;gap:34px}
@media(max-width:820px){.two-col{grid-template-columns:1fr}}

/* ---------- Utility ---------- */
.mt1{margin-top:8px}.mt2{margin-top:16px}.mt3{margin-top:26px}.mt4{margin-top:40px}
.center{text-align:center}
.muted{color:var(--muted)}
.hidden{display:none !important}
@media print{
  .site-head,footer.site,.floaters,.assistant,.no-print{display:none !important}
  body{background:#fff;color:#000}
}
@media (prefers-reduced-motion:reduce){*{transition:none !important;animation:none !important}}

/* ---------- บล็อกเนื้อหาสองภาษา (สลับตาม <html lang>) ---------- */
html[lang="th"] .lang-en{display:none}
html[lang="en"] .lang-th{display:none}
.prose{max-width:72ch;font-size:15.5px;display:grid;gap:14px}
.prose h2{font-size:20px;margin-top:14px}
.prose h3{font-size:16.5px}
.prose ul{padding-left:22px;display:grid;gap:6px}