/* ==========================================================================
   Mathtter Worksheet — Design System
   โทนสี: ดำ · ขาว · เขียว   |   อารมณ์: โมเดิร์น สะอาด แบบ Apple
   ========================================================================== */

:root{
  --ink:#0a0d0c;
  --ink-2:#1d2422;
  --ink-3:#5b6764;
  --ink-4:#8b9794;

  --green:#0f7a4d;
  --green-dark:#0b5c3a;
  --green-deep:#123f2e;
  --green-soft:#edf6f1;
  --green-line:#cfe6da;

  --bg:#ffffff;
  --bg-soft:#f6f8f7;
  --bg-tint:#fbfcfb;

  --line:rgba(10,13,12,.09);
  --line-2:rgba(10,13,12,.16);

  --blue:#2563a8; --blue-soft:#eaf1fa;
  --orange:#c47510; --orange-soft:#fdf2e3;
  --red:#c0392f;    --red-soft:#fcedeb;

  --r-xs:8px; --r-sm:12px; --r:16px; --r-lg:22px; --r-xl:30px;
  --sh-1:0 1px 2px rgba(10,13,12,.05), 0 1px 1px rgba(10,13,12,.03);
  --sh-2:0 4px 16px rgba(10,13,12,.07), 0 1px 3px rgba(10,13,12,.05);
  --sh-3:0 18px 50px rgba(10,13,12,.14), 0 4px 12px rgba(10,13,12,.07);
  --ease:cubic-bezier(.32,.72,0,1);

  --hdr-h:124px;
}

*{box-sizing:border-box;margin:0;padding:0}
[hidden]{display:none!important}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:'Inter','IBM Plex Sans Thai',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  color:var(--ink); background:var(--bg);
  font-size:15px; line-height:1.6;
  -webkit-font-smoothing:antialiased; -moz-osx-font-smoothing:grayscale;
  letter-spacing:-.005em;
}
button,input,select{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
h1,h2,h3{line-height:1.25;letter-spacing:-.028em;font-weight:700}
.muted{color:var(--ink-4);font-weight:500}
.ic{width:19px;height:19px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex:none}
.ic-big{width:40px;height:40px;fill:none;stroke:currentColor;stroke-width:1.4;stroke-linecap:round;stroke-linejoin:round}
::selection{background:var(--green);color:#fff}

/* ── ปุ่ม ─────────────────────────────────────────────────────────────── */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:44px;padding:0 22px;border-radius:999px;
  font-weight:600;font-size:14.5px;white-space:nowrap;
  transition:transform .22s var(--ease), background .22s, box-shadow .22s, opacity .2s;
}
.btn:active{transform:scale(.965)}
.btn-primary{background:var(--green);color:#fff;box-shadow:0 1px 2px rgba(15,122,77,.3)}
.btn-primary:hover{background:var(--green-dark);box-shadow:0 6px 18px rgba(15,122,77,.28)}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:var(--ink-2)}
.btn-ghost{background:rgba(10,13,12,.05);color:var(--ink)}
.btn-ghost:hover{background:rgba(10,13,12,.09)}
.btn-sm{height:38px;padding:0 18px;font-size:13.5px}
.btn-xs{height:32px;padding:0 14px;font-size:12.5px}
.btn-block{width:100%}
.link-btn{color:var(--ink-4);font-size:13px;font-weight:600}
.link-btn:hover{color:var(--red)}

/* ══════════════════════════════════════════════════════════════════════
   HEADER
   ══════════════════════════════════════════════════════════════════════ */
.hdr{
  position:sticky;top:0;z-index:60;
  background:rgba(255,255,255,.78);
  backdrop-filter:saturate(180%) blur(22px);
  -webkit-backdrop-filter:saturate(180%) blur(22px);
  border-bottom:1px solid var(--line);
}
.hdr-in{
  max-width:1720px;margin:0 auto;padding:12px 26px;
  display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:26px;
}
.brand{display:flex;align-items:center;gap:11px}
.brand-mark{
  width:38px;height:38px;border-radius:11px;flex:none;
  background:var(--green-deep);color:#fff;
  display:grid;place-items:center;font-weight:800;font-size:20px;letter-spacing:-.02em;
}
.brand-txt{display:flex;flex-direction:column;line-height:1.05}
.brand-txt b{font-size:16.5px;font-weight:800;letter-spacing:-.02em}
.brand-txt i{font-style:normal;font-size:9.5px;font-weight:600;letter-spacing:.28em;color:var(--ink-4)}

.search{
  position:relative;display:flex;align-items:center;gap:10px;
  height:46px;padding:0 16px;border-radius:999px;
  background:var(--bg-soft);border:1px solid transparent;
  transition:border-color .2s, background .2s, box-shadow .2s;
}
.search:focus-within{background:#fff;border-color:var(--green-line);box-shadow:0 0 0 4px rgba(15,122,77,.09)}
.search .ic{color:var(--ink-4)}
.search input{flex:1;min-width:0;border:0;background:none;outline:none;font-size:14.5px}
.search input::placeholder{color:var(--ink-4)}
.search-x{width:22px;height:22px;border-radius:50%;background:var(--line-2);color:#fff;font-size:11px;line-height:1}

.hdr-act{display:flex;align-items:center;gap:10px}
.ghost-btn{
  display:flex;align-items:center;gap:9px;height:44px;padding:0 15px;border-radius:14px;
  transition:background .2s;
}
.ghost-btn:hover{background:var(--bg-soft)}
.ghost-btn .ic{color:var(--green)}
.ghost-btn span{display:flex;flex-direction:column;line-height:1.2;text-align:left}
.ghost-btn b{font-size:13.5px;font-weight:600}
.ghost-btn i{font-style:normal;font-size:11px;color:var(--ink-4)}

.cart-btn{
  position:relative;display:flex;align-items:center;gap:10px;
  height:44px;padding:0 18px 0 15px;border-radius:14px;
  background:var(--ink);color:#fff;transition:background .2s,transform .2s var(--ease);
}
.cart-btn:hover{background:var(--ink-2)}
.cart-btn.pop{animation:pop .45s var(--ease)}
@keyframes pop{0%{transform:scale(1)}40%{transform:scale(1.09)}100%{transform:scale(1)}}
.cart-sum{font-size:14px;font-weight:600;font-variant-numeric:tabular-nums}
.cart-badge{
  position:absolute;top:3px;left:23px;min-width:18px;height:18px;padding:0 5px;
  border-radius:999px;background:var(--green);color:#fff;
  font-size:11px;font-weight:700;display:grid;place-items:center;
  border:2px solid var(--ink);
}

/* ── แถบระดับชั้น ── */
.grades{
  background:var(--green-deep);
  display:flex;justify-content:center;gap:2px;
  padding:0 26px;overflow-x:auto;scrollbar-width:none;
}
.grades::-webkit-scrollbar{display:none}
.grade{
  padding:0 26px;height:52px;display:grid;place-items:center;
  color:rgba(255,255,255,.72);font-size:15px;font-weight:600;white-space:nowrap;
  position:relative;transition:color .2s,background .2s;
}
.grade:hover{color:#fff;background:rgba(255,255,255,.07)}
.grade.on{color:#fff;background:var(--green)}

/* ══════════════════════════════════════════════════════════════════════
   HERO
   ══════════════════════════════════════════════════════════════════════ */
.hero{position:relative;overflow:hidden;background:var(--bg);padding:88px 26px 76px;text-align:center}
.hero-in{position:relative;z-index:2;max-width:840px;margin:0 auto}
.hero-eyebrow{
  display:inline-block;padding:6px 15px;border-radius:999px;margin-bottom:22px;
  background:var(--green-soft);color:var(--green-dark);
  font-size:12.5px;font-weight:600;letter-spacing:.02em;
}
.hero h1{font-size:clamp(38px,5.6vw,70px);font-weight:800;letter-spacing:-.04em;line-height:1.08}
.hero h1 em{font-style:normal;color:var(--green)}
.hero-lead{margin:22px auto 0;max-width:560px;font-size:17px;color:var(--ink-3);line-height:1.65}
.hero-cta{display:flex;gap:12px;justify-content:center;margin-top:34px;flex-wrap:wrap}
.hero-cta .btn{height:50px;padding:0 30px;font-size:15.5px}
.hero-stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:8px;
  max-width:640px;margin:62px auto 0;
}
.hero-stats div{display:flex;flex-direction:column;gap:2px}
.hero-stats b{font-size:30px;font-weight:800;letter-spacing:-.03em;font-variant-numeric:tabular-nums}
.hero-stats span{font-size:12.5px;color:var(--ink-4);font-weight:500}
.hero-glow{
  position:absolute;top:-40%;left:50%;transform:translateX(-50%);
  width:1100px;height:700px;border-radius:50%;pointer-events:none;
  background:radial-gradient(circle,rgba(15,122,77,.11),transparent 62%);
}

/* ══════════════════════════════════════════════════════════════════════
   WORKSPACE
   ══════════════════════════════════════════════════════════════════════ */
.wrap{max-width:1720px;margin:0 auto;padding:0 26px 90px}
.crumb{display:flex;align-items:center;gap:9px;padding:20px 2px 18px;font-size:13px;color:var(--ink-4);font-weight:500}
.crumb b{color:var(--ink);font-weight:600}
.crumb span{opacity:.45}

/* align-items ต้องเป็น stretch เพื่อให้คอลัมน์สูงเท่าแถว มิฉะนั้น sticky จะไม่มีระยะให้เลื่อน */
.cols{display:grid;grid-template-columns:376px minmax(0,1fr) 336px;gap:20px;align-items:stretch}

.panel{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden}
.sticky{position:sticky;top:calc(var(--hdr-h) + 16px);max-height:calc(100vh - var(--hdr-h) - 32px);display:flex;flex-direction:column}
.panel-head{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:16px 18px 13px;border-bottom:1px solid var(--line);flex:none;
}
.panel-head h2{font-size:15.5px;display:flex;align-items:center;gap:8px}
.panel-head .muted{font-size:13px;font-weight:500}
.chip{
  min-width:22px;height:22px;padding:0 7px;border-radius:999px;
  background:var(--green-soft);color:var(--green-dark);
  font-size:12px;font-weight:700;display:inline-grid;place-items:center;
}
.pg-count{font-size:12.5px;color:var(--ink-4);font-weight:600;font-variant-numeric:tabular-nums}

/* ══════════ ซ้าย: PREVIEW ══════════ */
.pv-meta{padding:12px 18px;border-bottom:1px solid var(--line);display:none;flex:none}
.pv-meta.on{display:block}
.pv-meta b{display:block;font-size:15px;font-weight:700;letter-spacing:-.02em}
.pv-meta span{font-size:12.5px;color:var(--ink-4)}

.pv-stage{
  flex:1;min-height:0;overflow:auto;background:var(--bg-soft);
  padding:16px;display:flex;justify-content:center;align-items:flex-start;
  scrollbar-width:thin;
}
.pv-stage::-webkit-scrollbar{width:8px;height:8px}
.pv-stage::-webkit-scrollbar-thumb{background:var(--line-2);border-radius:99px}
.pv-empty{
  margin:auto;text-align:center;color:var(--ink-4);padding:44px 20px;max-width:280px;
}
.pv-empty .ic-big{color:var(--line-2);margin-bottom:14px}
.pv-empty b{display:block;color:var(--ink-2);font-size:14.5px;margin-bottom:6px}
.pv-empty span{font-size:12.5px;line-height:1.7}

.pv-fit{position:relative;flex:none}
.pv-canvas{position:absolute;top:0;left:0;transform-origin:top left;will-change:transform}

.pv-bar{
  display:flex;align-items:center;gap:6px;padding:9px 12px;
  border-top:1px solid var(--line);background:#fff;flex:none;
}
.pv-nav,.pv-tool{
  width:32px;height:32px;border-radius:10px;display:grid;place-items:center;
  color:var(--ink-2);font-size:17px;line-height:1;transition:background .18s;
}
.pv-nav:hover,.pv-tool:hover{background:var(--bg-soft)}
.pv-nav:disabled{opacity:.28;cursor:default}
.pv-dots{display:flex;gap:5px;align-items:center;margin:0 3px}
.pv-dot{
  width:26px;height:26px;border-radius:8px;font-size:12px;font-weight:700;
  color:var(--ink-4);transition:.18s;
}
.pv-dot.on{background:var(--ink);color:#fff}
.pv-sep{flex:1}
.pv-zoom{font-size:11.5px;color:var(--ink-4);font-weight:600;min-width:36px;text-align:center;font-variant-numeric:tabular-nums}

.pv-buy{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:12px 16px;border-top:1px solid var(--line);flex:none;background:var(--bg-tint);
}
.pv-buy-info{min-width:0}
.pv-buy-info b{display:block;font-size:13.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pv-buy-info span{font-size:11.5px;color:var(--ink-4)}
.pv-buy-act{display:flex;align-items:center;gap:10px;flex:none}
.price{font-size:15px;font-weight:700;font-variant-numeric:tabular-nums}

.pv-promo{
  display:flex;align-items:center;gap:11px;padding:13px 16px;flex:none;
  background:var(--green-soft);border-top:1px solid var(--green-line);
}
.pv-promo .ic{color:var(--green-dark)}
.pv-promo div{flex:1;min-width:0}
.pv-promo b{display:block;font-size:13px;color:var(--green-deep)}
.pv-promo span{font-size:11.5px;color:var(--green-dark);opacity:.85}

/* ══════════ กลาง: รายการ ══════════ */
.list-head{padding:2px 2px 18px}
.list-head h2{font-size:27px;letter-spacing:-.032em}
.list-head p{font-size:13.5px;color:var(--ink-4);margin-top:5px}

.types{display:grid;grid-template-columns:repeat(3,1fr);gap:11px;margin-bottom:16px}
.type{
  display:flex;align-items:center;gap:12px;padding:13px 15px;
  border:1.5px solid var(--line);border-radius:var(--r);background:#fff;text-align:left;
  transition:border-color .2s,background .2s,transform .2s var(--ease);
}
.type:hover{border-color:var(--line-2);transform:translateY(-1px)}
.type-no{
  width:32px;height:32px;border-radius:10px;flex:none;display:grid;place-items:center;
  font-size:15px;font-weight:700;color:#fff;
}
.type-txt{min-width:0}
.type-txt b{display:block;font-size:14px;font-weight:650;letter-spacing:-.015em}
.type-txt span{font-size:11.5px;color:var(--ink-4);display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.type[data-tone=blue]   .type-no{background:var(--blue)}
.type[data-tone=green]  .type-no{background:var(--green)}
.type[data-tone=orange] .type-no{background:var(--orange)}
.type.on[data-tone=blue]  {border-color:var(--blue);background:var(--blue-soft)}
.type.on[data-tone=green] {border-color:var(--green);background:var(--green-soft)}
.type.on[data-tone=orange]{border-color:var(--orange);background:var(--orange-soft)}

.filters{
  display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;
  padding:11px 14px;border:1px solid var(--line);border-radius:var(--r);background:#fff;margin-bottom:16px;
}
.filter-left,.filter-right{display:flex;align-items:center;gap:9px;flex-wrap:wrap}
.filter-right .muted{font-size:12.5px}
.filter-ico{display:flex;align-items:center;gap:7px;font-size:13px;font-weight:600;color:var(--ink-2)}
.filter-ico .ic{color:var(--ink-4)}
.select{position:relative}
.select::after{
  content:'';position:absolute;right:13px;top:50%;width:6px;height:6px;
  border-right:1.6px solid var(--ink-4);border-bottom:1.6px solid var(--ink-4);
  transform:translateY(-70%) rotate(45deg);pointer-events:none;
}
.select select{
  appearance:none;-webkit-appearance:none;
  height:36px;padding:0 32px 0 13px;border-radius:10px;
  border:1px solid var(--line);background:#fff;
  font-size:13px;font-weight:500;cursor:pointer;outline:none;max-width:210px;
  text-overflow:ellipsis;transition:border-color .2s;
}
.select select:hover{border-color:var(--line-2)}
.select select:focus{border-color:var(--green);box-shadow:0 0 0 3px rgba(15,122,77,.1)}

.chapter{border:1px solid var(--line);border-radius:var(--r-lg);background:#fff;margin-bottom:14px;overflow:hidden}
.chapter-head{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:14px 18px;border-bottom:1px solid var(--line);background:var(--bg-tint);
}
.chapter-head b{font-size:14.5px;font-weight:650;letter-spacing:-.018em}
.chapter-head span{font-size:12px;color:var(--ink-4);font-weight:500}

.row{
  display:grid;grid-template-columns:44px minmax(0,1fr) auto auto;
  align-items:center;gap:8px 14px;padding:14px 18px;
  border-bottom:1px solid var(--line);transition:background .18s;
}
.row:last-child{border-bottom:0}
.row:hover{background:var(--bg-tint)}
.row.active{background:var(--green-soft)}
.row-ic{
  width:44px;height:44px;border-radius:13px;display:grid;place-items:center;
  color:#fff;flex:none;
}
.row-ic .ic{width:21px;height:21px;stroke-width:1.9}
.row-main{min-width:0}
.row-main b{
  display:block;font-size:14.5px;font-weight:620;letter-spacing:-.018em;margin-bottom:3px;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.row-main>i{
  font-style:normal;display:block;font-size:12.5px;color:var(--ink-4);margin-bottom:6px;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.row-tags{display:flex;align-items:center;gap:6px;flex-wrap:nowrap;overflow:hidden}
.tag{
  font-size:11px;font-weight:600;padding:2.5px 8px;border-radius:7px;
  background:var(--bg-soft);color:var(--ink-3);white-space:nowrap;
}
.tag-easy{background:var(--green-soft);color:var(--green-dark)}
.tag-mid{background:var(--orange-soft);color:var(--orange)}
.tag-hard{background:var(--red-soft);color:var(--red)}
.tag-new{background:var(--ink);color:#fff}
.dot-new{
  font-style:normal;display:inline-block;vertical-align:1.5px;margin-right:7px;
  padding:1.5px 7px;border-radius:6px;background:var(--ink);color:#fff;
  font-size:10px;font-weight:700;letter-spacing:0;
}
.row-price{font-size:14.5px;font-weight:700;font-variant-numeric:tabular-nums;white-space:nowrap}
.row-act{display:flex;align-items:center;gap:8px}
.btn-eye{
  display:inline-flex;align-items:center;gap:7px;height:36px;padding:0 15px;
  border:1px solid var(--line-2);border-radius:999px;
  font-size:13px;font-weight:600;transition:.2s var(--ease);white-space:nowrap;
}
.btn-eye:hover{border-color:var(--ink);background:var(--ink);color:#fff}
.btn-eye .ic{width:16px;height:16px}
.btn-add{
  display:inline-flex;align-items:center;gap:7px;height:36px;padding:0 15px;
  border-radius:999px;background:var(--green-deep);color:#fff;
  font-size:13px;font-weight:600;transition:.2s var(--ease);white-space:nowrap;
}
.btn-add:hover{background:var(--green)}
.btn-add .ic{width:16px;height:16px}
.btn-add.in{background:var(--green-soft);color:var(--green-dark)}
.btn-add:active{transform:scale(.94)}

.empty-list{
  text-align:center;padding:70px 20px;color:var(--ink-4);
  border:1px dashed var(--line-2);border-radius:var(--r-lg);
}
.empty-list b{display:block;color:var(--ink-2);font-size:15px;margin:12px 0 6px}
.empty-list span{font-size:13px}

.more-wrap{display:flex;justify-content:center;padding:6px 0 4px}

/* ══════════ ขวา: ตะกร้า ══════════ */
.cart-items{flex:1;min-height:0;overflow-y:auto;padding:6px 0;scrollbar-width:thin}
.cart-items::-webkit-scrollbar{width:7px}
.cart-items::-webkit-scrollbar-thumb{background:var(--line-2);border-radius:99px}
.cart-empty{text-align:center;padding:48px 22px;color:var(--ink-4)}
.cart-empty .ic-big{color:var(--line-2);margin-bottom:12px}
.cart-empty b{display:block;color:var(--ink-2);font-size:14px;margin-bottom:5px}
.cart-empty span{font-size:12.5px;line-height:1.7}

.ci{
  display:grid;grid-template-columns:42px minmax(0,1fr) auto;gap:11px;align-items:center;
  padding:11px 16px;animation:slideIn .32s var(--ease);
}
@keyframes slideIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
.ci-thumb{
  width:42px;height:54px;border-radius:7px;background:#fff;border:1px solid var(--line);
  overflow:hidden;position:relative;flex:none;
}
.ci-thumb i{position:absolute;left:5px;right:5px;height:2px;background:var(--line-2);border-radius:2px}
.ci-thumb b{position:absolute;left:5px;top:5px;font-size:7px;color:var(--green);font-weight:700}
.ci-main{min-width:0}
.ci-main b{display:block;font-size:12.8px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;letter-spacing:-.015em}
.ci-main span{display:block;font-size:11px;color:var(--ink-4);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ci-main em{font-style:normal;font-size:12.5px;font-weight:700;font-variant-numeric:tabular-nums}
.ci-x{
  width:24px;height:24px;border-radius:50%;color:var(--ink-4);font-size:12px;
  display:grid;place-items:center;transition:.18s;
}
.ci-x:hover{background:var(--red-soft);color:var(--red)}

.cart-calc{padding:14px 16px;border-top:1px solid var(--line);background:var(--bg-tint);flex:none}
.calc-row{display:flex;justify-content:space-between;align-items:center;font-size:13px;color:var(--ink-3);margin-bottom:8px}
.calc-row b{font-weight:600;color:var(--ink-2);font-variant-numeric:tabular-nums}
.calc-disc{color:var(--green-dark)}
.calc-disc b{color:var(--green)}
.calc-total{
  display:flex;justify-content:space-between;align-items:baseline;
  padding-top:11px;margin-bottom:13px;border-top:1px solid var(--line);
}
.calc-total span{font-size:13.5px;font-weight:600}
.calc-total b{font-size:23px;font-weight:800;letter-spacing:-.03em;font-variant-numeric:tabular-nums}

.tier{padding:13px 16px;background:var(--green-soft);border-top:1px solid var(--green-line);flex:none}
.tier-top{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.tier-top .ic{color:var(--green-dark)}
.tier-top b{display:block;font-size:12.8px;color:var(--green-deep);font-weight:650}
.tier-top span{font-size:11.5px;color:var(--green-dark);opacity:.85}
.tier-bar{height:6px;border-radius:99px;background:rgba(15,122,77,.16);overflow:hidden}
.tier-bar i{display:block;height:100%;border-radius:99px;background:var(--green);transition:width .45s var(--ease)}
.tier-marks{display:flex;justify-content:space-between;margin-top:6px;font-size:10px;color:var(--green-dark);opacity:.7;font-weight:600}

.cart-trust{padding:11px 16px;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:7px;flex:none}
.cart-trust span{display:flex;align-items:center;gap:8px;font-size:11.5px;color:var(--ink-4);font-weight:500}
.cart-trust .ic{width:15px;height:15px;color:var(--green)}

/* ══════════ แถบตะกร้าลอย (จอเล็ก) ══════════ */
.mini-cart{
  position:fixed;left:14px;right:14px;bottom:14px;z-index:55;display:none;
  align-items:center;gap:12px;padding:11px 14px;border-radius:var(--r);
  background:rgba(10,13,12,.94);backdrop-filter:blur(16px);color:#fff;box-shadow:var(--sh-3);
}
.mini-cart b{font-size:16px;font-weight:700;font-variant-numeric:tabular-nums}
.mini-cart span{font-size:11.5px;opacity:.65;display:block}
.mini-cart .btn{margin-left:auto}

/* ══════════════════════════════════════════════════════════════════════
   จุดเด่น + FOOTER
   ══════════════════════════════════════════════════════════════════════ */
.feats{border-top:1px solid var(--line);background:var(--bg-soft)}
.feats-in{
  max-width:1720px;margin:0 auto;padding:34px 26px;
  display:grid;grid-template-columns:repeat(6,1fr);gap:22px;
}
.feat{display:flex;flex-direction:column;gap:4px}
.feat .ic{color:var(--green);margin-bottom:6px;width:22px;height:22px}
.feat b{font-size:13.5px;font-weight:650}
.feat span{font-size:12px;color:var(--ink-4)}

.ftr{background:var(--ink);color:rgba(255,255,255,.7)}
.ftr-in{
  max-width:1720px;margin:0 auto;padding:56px 26px 40px;
  display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:38px;
}
.ftr-brand .brand-mark{background:var(--green);margin-bottom:14px}
.ftr-brand div{display:flex;flex-direction:column;line-height:1.05;margin-bottom:14px}
.ftr-brand b{color:#fff;font-size:16px;font-weight:800;letter-spacing:-.02em}
.ftr-brand i{font-style:normal;font-size:9.5px;letter-spacing:.28em;color:rgba(255,255,255,.42)}
.ftr-brand p{font-size:12.5px;line-height:1.8}
.ftr-col b{display:block;color:#fff;font-size:13.5px;margin-bottom:14px}
.ftr-links{display:flex;flex-direction:column;gap:9px}
.ftr-links a{font-size:12.8px;transition:color .18s}
.ftr-links a:hover{color:#fff}
.ftr-col .ftr-links{max-height:180px;flex-wrap:wrap}
.ftr-social{margin-top:16px}
.ftr-social a{
  display:inline-grid;place-items:center;height:34px;padding:0 16px;border-radius:999px;
  background:rgba(255,255,255,.1);color:#fff;font-size:12px;font-weight:600;transition:background .2s;
}
.ftr-social a:hover{background:var(--green)}
.ftr-btm{
  border-top:1px solid rgba(255,255,255,.1);
  max-width:1720px;margin:0 auto;padding:18px 26px;
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:11.8px;
}

/* ══════════════════════════════════════════════════════════════════════
   MODAL / LIGHTBOX / TOAST
   ══════════════════════════════════════════════════════════════════════ */
.modal{position:fixed;inset:0;z-index:120;display:grid;place-items:center;padding:22px}
.modal-back{position:absolute;inset:0;background:rgba(10,13,12,.5);backdrop-filter:blur(6px);animation:fade .25s}
@keyframes fade{from{opacity:0}to{opacity:1}}
.modal-card{
  position:relative;width:min(560px,100%);max-height:86vh;overflow-y:auto;
  background:#fff;border-radius:var(--r-xl);box-shadow:var(--sh-3);
  padding:34px;animation:rise .32s var(--ease);
}
@keyframes rise{from{opacity:0;transform:translateY(18px) scale(.98)}to{opacity:1;transform:none}}
.modal-card.wide{width:min(760px,100%)}
.modal-x{
  position:absolute;top:16px;right:16px;width:32px;height:32px;border-radius:50%;
  background:var(--bg-soft);color:var(--ink-3);font-size:13px;display:grid;place-items:center;transition:.18s;
}
.modal-x:hover{background:var(--line-2);color:#fff}
.modal-card h3{font-size:22px;margin-bottom:8px;letter-spacing:-.03em}
.modal-card>div>p{font-size:14px;color:var(--ink-3);line-height:1.75}
.m-sec{margin-top:22px}
.m-sec h4{font-size:14px;margin-bottom:10px;font-weight:650}
.m-list{display:flex;flex-direction:column;gap:10px}
.m-item{display:flex;gap:11px;font-size:13.5px;color:var(--ink-3);line-height:1.65}
.m-item i{
  font-style:normal;flex:none;width:22px;height:22px;border-radius:50%;
  background:var(--green-soft);color:var(--green-dark);
  font-size:11.5px;font-weight:700;display:grid;place-items:center;margin-top:2px;
}
.m-form{display:flex;flex-direction:column;gap:11px;margin-top:20px}
.m-form input{
  height:46px;padding:0 16px;border-radius:13px;border:1px solid var(--line-2);
  outline:none;font-size:14.5px;transition:border-color .2s,box-shadow .2s;
}
.m-form input:focus{border-color:var(--green);box-shadow:0 0 0 3px rgba(15,122,77,.1)}
.m-note{font-size:11.5px;color:var(--ink-4);text-align:center;margin-top:4px}

.pay{display:grid;grid-template-columns:auto minmax(0,1fr);gap:26px;margin-top:22px;align-items:start}
.pay-qr{
  padding:14px;border:1px solid var(--line);border-radius:var(--r);background:#fff;
  text-align:center;box-shadow:var(--sh-1);
}
.pay-qr svg{display:block;border-radius:6px}
.pay-qr b{display:block;font-size:12px;margin-top:10px;color:var(--green-deep)}
.pay-qr span{font-size:11px;color:var(--ink-4)}
.pay-info h4{font-size:13.5px;margin-bottom:12px}
.pay-lines{display:flex;flex-direction:column;gap:9px;font-size:13px}
.pay-lines div{display:flex;justify-content:space-between;gap:12px;color:var(--ink-3)}
.pay-lines b{color:var(--ink);font-weight:600;font-variant-numeric:tabular-nums}
.pay-total{
  margin-top:14px;padding-top:13px;border-top:1px solid var(--line);
  display:flex;justify-content:space-between;align-items:baseline;
}
.pay-total span{font-size:13.5px;font-weight:600}
.pay-total b{font-size:26px;font-weight:800;letter-spacing:-.03em;color:var(--green);font-variant-numeric:tabular-nums}
.pay-order{margin-top:16px;padding:12px 14px;border-radius:12px;background:var(--bg-soft);font-size:12px;color:var(--ink-3)}
.pay-order b{display:block;color:var(--ink);font-size:13px;margin-bottom:3px}
.upload{
  margin-top:18px;padding:20px;border:1.5px dashed var(--line-2);border-radius:var(--r);
  text-align:center;cursor:pointer;transition:.2s;
}
.upload:hover{border-color:var(--green);background:var(--green-soft)}
.upload b{display:block;font-size:13.5px;margin-bottom:4px}
.upload span{font-size:12px;color:var(--ink-4)}
.pay-items{margin-top:18px;max-height:150px;overflow-y:auto;border-top:1px solid var(--line);padding-top:12px}
.pay-item{display:flex;justify-content:space-between;gap:12px;font-size:12.5px;color:var(--ink-3);padding:4px 0}

.lightbox{position:fixed;inset:0;z-index:130;background:rgba(10,13,12,.94);display:flex;flex-direction:column;animation:fade .25s}
.lb-bar{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:14px 20px;color:#fff;border-bottom:1px solid rgba(255,255,255,.1);flex:none;
}
.lb-bar>span{font-size:14px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.lb-tools{display:flex;align-items:center;gap:6px;flex:none}
.lb-tools button{
  width:36px;height:36px;border-radius:11px;color:#fff;font-size:17px;
  display:grid;place-items:center;transition:background .18s;
}
.lb-tools button:hover{background:rgba(255,255,255,.14)}
.lb-tools span{font-size:13px;padding:0 8px;font-variant-numeric:tabular-nums;opacity:.8}
.lb-stage{flex:1;overflow:auto;padding:24px;display:flex;justify-content:center;align-items:flex-start}
.lb-stage .ws-page{box-shadow:0 30px 90px rgba(0,0,0,.5)}

.toast{
  position:fixed;bottom:26px;left:50%;transform:translateX(-50%);z-index:200;
  display:flex;align-items:center;gap:10px;
  padding:13px 20px;border-radius:999px;background:var(--ink);color:#fff;
  font-size:13.5px;font-weight:500;box-shadow:var(--sh-3);
  animation:toastIn .35s var(--ease);
}
@keyframes toastIn{from{opacity:0;transform:translate(-50%,14px)}to{opacity:1;transform:translate(-50%,0)}}
.toast .ic{color:#54d19a;width:17px;height:17px}

/* ══════════════════════════════════════════════════════════════════════
   หน้ากระดาษใบงาน (Worksheet page)
   ขนาดฐาน 480 × 679 px  → ย่อ/ขยายด้วย transform
   ══════════════════════════════════════════════════════════════════════ */
.ws-page{
  width:480px;min-height:679px;flex:none;position:relative;overflow:hidden;
  background:#fff;border-radius:5px;box-shadow:var(--sh-2);
  padding:26px 30px 34px;color:#0f172a;
  font-family:'IBM Plex Sans Thai','Inter',sans-serif;font-size:11px;line-height:1.5;
}
.ws-page::after{
  content:'ตัวอย่าง · PREVIEW';
  position:absolute;top:46%;left:50%;
  transform:translate(-50%,-50%) rotate(-24deg);
  font-size:44px;font-weight:800;letter-spacing:.06em;
  color:rgba(15,122,77,.07);white-space:nowrap;pointer-events:none;
}
.ws-mark{
  width:34px;height:34px;border-radius:9px;flex:none;background:#123f2e;color:#fff;
  display:grid;place-items:center;font-family:'Inter',sans-serif;font-weight:800;font-size:19px;
}
.ws-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:18px}
.ws-head-left{display:flex;align-items:center;gap:9px}
.ws-head-txt{display:flex;flex-direction:column;line-height:1.25}
.ws-head-txt strong{font-size:12px;font-weight:700}
.ws-head-txt span{font-size:7.5px;color:#64748b}
.ws-pill{
  background:#123f2e;color:#fff;border-radius:999px;padding:5px 13px;
  font-size:9px;font-weight:600;white-space:nowrap;max-width:190px;overflow:hidden;text-overflow:ellipsis;
}
.ws-h2{font-size:21px;font-weight:700;letter-spacing:-.02em;margin-bottom:12px}
.ws-instruct,.ws-example{display:flex;gap:12px;align-items:baseline;margin-bottom:10px}
.ws-instruct{background:#eef7f2;border-radius:8px;padding:9px 13px}
.ws-instruct b,.ws-example b{color:#0f7a4d;font-size:10px;font-weight:700;flex:none}
.ws-instruct span,.ws-example span{font-size:10px;color:#334155}
.ws-example{padding:2px 13px 8px}
.ws-example span{font-weight:700;font-size:12px;color:#0f172a}
.ws-foot{
  position:absolute;left:30px;right:30px;bottom:12px;
  display:flex;justify-content:space-between;
  border-top:1px solid #e2e8f0;padding-top:7px;font-size:8px;color:#94a3b8;
}

/* ---- หน้าปก ---- */
.ws-cover{padding:34px 32px}
.ws-blob{position:absolute;border-radius:50%;pointer-events:none}
.ws-blob-1{width:230px;height:230px;background:#e6f2eb;top:-70px;right:-70px}
.ws-blob-2{width:170px;height:170px;background:#fdf0dd;bottom:-60px;left:-55px}
.ws-cover-head{display:flex;align-items:center;gap:13px;position:relative;z-index:2;margin-bottom:16px}
.ws-cover .ws-mark{width:52px;height:52px;border-radius:14px;font-size:28px}
.ws-cover-title h1{font-size:21px;font-weight:800;letter-spacing:-.02em}
.ws-cover-title p{font-size:8.5px;color:#64748b;margin-top:2px}
.ws-tag{
  display:inline-block;background:#0f7a4d;color:#fff;border-radius:999px;
  padding:6px 16px;font-size:10px;font-weight:600;position:relative;z-index:2;
}
.ws-cover-body{position:relative;z-index:2;margin-top:22px}
.ws-subject{font-size:14px;font-weight:700;color:#334155;margin-bottom:4px}
.ws-title{font-size:31px;font-weight:800;letter-spacing:-.03em;line-height:1.12;color:#0f172a;max-width:400px}
.ws-sub{font-size:9.5px;color:#64748b;margin-top:14px;line-height:1.7}
.ws-boxgrid{display:grid;grid-template-columns:1fr 1fr;gap:11px;margin-top:26px}
.ws-box{border-radius:9px;padding:11px 13px;border-left:3.5px solid}
.ws-box strong{display:block;font-size:11px;font-weight:700}
.ws-box span{font-size:8.5px;color:#64748b}
.ws-box-green {background:#eaf5ef;border-color:#0f7a4d}
.ws-box-green strong{color:#0b5c3a}
.ws-box-blue  {background:#eaf1fa;border-color:#2563a8}
.ws-box-blue strong{color:#1d4d85}
.ws-box-orange{background:#fdf2e3;border-color:#e0a03c}
.ws-box-orange strong{color:#a5650e}
.ws-box-red   {background:#fcedeb;border-color:#c0392f}
.ws-box-red strong{color:#9c2e26}

/* ---- แผนการฝึก ---- */
.ws-plan{display:flex;flex-direction:column;gap:9px;margin-top:14px}
.ws-plan-row{
  display:flex;align-items:center;gap:11px;border-radius:9px;padding:11px 14px;border-left:0;
}
.ws-plan-row strong{flex:1;font-size:11.5px;font-weight:700}
.ws-plan-row em{font-style:normal;font-size:10px;font-weight:700;color:#475569}
.ws-num{
  width:20px;height:20px;border-radius:50%;flex:none;display:grid;place-items:center;
  color:#fff;font-size:9.5px;font-weight:700;
}
.ws-num-green{background:#0f7a4d}
.ws-num-blue{background:#2563a8}
.ws-num-orange{background:#e0a03c}
.ws-num-red{background:#c0392f}
.ws-note{margin-top:22px;padding:14px 16px;border-radius:10px;background:#f8fafc;border:1px solid #e2e8f0}
.ws-note strong{font-size:11px;display:block;margin-bottom:5px}
.ws-note p{font-size:9.5px;color:#475569;line-height:1.75}

/* ---- โจทย์ ---- */
.ws-grid2{display:grid;grid-template-columns:1fr 1fr;gap:11px;margin-top:12px;min-height:432px;align-content:space-between}
.ws-grid3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:11px;margin-top:12px;min-height:432px;align-content:space-between}
.ws-cell{position:relative;background:#f1f8f4;border:1px solid #dbeee4;border-radius:9px;padding:13px 12px 14px;min-height:78px}
.ws-cell-center{display:flex;flex-direction:column;align-items:center;justify-content:center}
.ws-qn{
  position:absolute;top:7px;left:7px;width:16px;height:16px;border-radius:50%;
  background:#0f7a4d;color:#fff;font-size:8.5px;font-weight:700;display:grid;place-items:center;
}
.ws-eq{font-size:16px;font-weight:700;display:flex;align-items:baseline;gap:5px;font-family:'Inter',sans-serif}
.ws-blank{display:inline-block;width:44px;border-bottom:1.6px solid #334155;height:15px}
.ws-blank-long{width:110px}

.ws-vert{display:flex;flex-direction:column;align-items:flex-end;padding:2px 14px 0 0;margin-top:4px}
.ws-carry{display:flex;gap:6px;margin-bottom:3px}
.ws-carry span{width:13px;height:13px;border:1px solid #cbd5e1;border-radius:3px}
.ws-vrow{display:flex;align-items:center;gap:20px;padding:1px 0}
.ws-vop{width:12px;font-size:15px;font-weight:700;text-align:left}
.ws-vnum{font-size:19px;font-weight:700;font-family:'Inter',sans-serif;min-width:44px;text-align:right}
.ws-vline{border-bottom:1.8px solid #0f172a;padding-bottom:3px}
.ws-vans{height:16px;border-bottom:1.4px solid #94a3b8;width:70px;margin-top:6px}

/* เว้นบรรทัดให้กว้างพอเขียนคำตอบ และกระจายเต็มหน้ากระดาษ */
.ws-list{
  display:grid;grid-template-columns:1fr 1fr;gap:12px 22px;margin-top:14px;
  min-height:432px;align-content:space-between;
}
.ws-litem{display:flex;gap:8px;align-items:baseline;font-size:12.5px;font-weight:600}
.ws-lno{color:#64748b;font-size:11px;font-weight:600;min-width:20px;font-family:'Inter',sans-serif}
.ws-lq{font-family:'Inter','IBM Plex Sans Thai',sans-serif}

.ws-words{display:flex;flex-direction:column;gap:12px;margin-top:12px;min-height:432px;justify-content:space-between}
.ws-word{display:flex;gap:10px;background:#f1f8f4;border:1px solid #dbeee4;border-radius:9px;padding:12px 13px;position:relative}
.ws-word .ws-qn{position:static;margin-top:1px}
.ws-word-body{flex:1;min-width:0}
.ws-word-body p{font-size:10.5px;line-height:1.7;color:#1e293b}
.ws-work{margin-top:8px}
.ws-work span{font-size:9px;color:#64748b;font-weight:600}
.ws-work i{display:block;height:1px;background:#cbd5e1;margin-top:11px}
.ws-answer{margin-top:9px;font-size:10px;font-weight:700;display:flex;align-items:baseline;gap:7px}

.ws-visual{display:grid;place-items:center;min-height:52px;margin-top:6px}
.ws-icons{font-size:14px;color:#0f7a4d;letter-spacing:2px;line-height:1.5;text-align:center;word-break:break-word}
.ws-clock{width:52px;height:52px}
.ws-vlabel{font-size:9px;color:#475569;margin-top:8px;text-align:center;font-weight:600}

/* ══════════════════════════════════════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════════════════════════════════════ */
@media (max-width:1500px){
  .cols{grid-template-columns:336px minmax(0,1fr) 312px;gap:16px}
  .feats-in{grid-template-columns:repeat(3,1fr);gap:26px}
}
@media (max-width:1240px){
  .cols{grid-template-columns:minmax(0,1fr) 312px}
  .col-preview{display:none}
  .hdr-in{grid-template-columns:auto minmax(0,1fr) auto;gap:16px}
  .ghost-btn span{display:none}
  .row{gap:8px 12px}
  .row-main>i{display:none}
}
@media (max-width:980px){
  :root{--hdr-h:118px}
  .cols{grid-template-columns:minmax(0,1fr)}
  .col-cart{display:none}
  .mini-cart{display:flex}
  .wrap{padding-bottom:100px}
  .types{grid-template-columns:1fr}
  .ftr-in{grid-template-columns:1fr 1fr;gap:30px}
  .hero{padding:60px 22px 54px}
  .hero-stats{grid-template-columns:repeat(2,1fr);gap:22px;margin-top:44px}
}
@media (max-width:720px){
  .hdr-in{grid-template-columns:auto auto;justify-content:space-between;gap:12px;row-gap:10px;padding:11px 16px}
  .search{grid-column:1/-1;order:3;height:42px}
  .filters{display:grid;grid-template-columns:1fr 1fr;gap:8px}
  .filter-left,.filter-right{display:contents}
  .filter-ico,.filter-right .muted{display:none}
  .select{width:100%}
  .select select{max-width:none;width:100%;height:38px}
  .row-tags{flex-wrap:wrap;overflow:visible}
  .toast{bottom:88px;max-width:calc(100% - 32px)}
  .brand-txt{display:none}
  .ghost-btn{display:none}
  .grade{padding:0 18px;height:46px;font-size:14px}
  .grades{justify-content:flex-start;padding:0 16px}
  .wrap{padding:0 16px 100px}
  .feats-in{grid-template-columns:1fr 1fr;padding:28px 18px}
  .ftr-in{grid-template-columns:1fr;padding:40px 18px 30px}
  .ftr-btm{padding:16px 18px}
  .row{grid-template-columns:38px minmax(0,1fr);gap:11px;row-gap:10px;padding:13px 14px}
  .row-price{grid-column:1/-1;font-size:13.5px}
  .row-act{grid-column:1/-1;justify-content:space-between}
  .btn-eye,.btn-add{flex:1;justify-content:center}
  .row-ic{width:38px;height:38px;border-radius:11px}
  .filters{padding:10px 12px}
  .select select{max-width:150px;font-size:12.5px}
  .list-head h2{font-size:22px}
  .modal-card{padding:26px 20px}
  .pay{grid-template-columns:1fr;gap:18px;justify-items:center}
  .pay-info{width:100%}
  .lb-stage{padding:12px}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}
  html{scroll-behavior:auto}
}