/* SB Sir (CS Satish Baheti) - Complete Stylesheet */
:root {
  --bg: #FFFFFF;
  --bg-soft: #F5F7FA;
  --surface: #FFFFFF;
  --ink: #142033;
  --ink-2: #3A4658;
  --muted: #6A7586;
  --line: #E4E8EE;
  --line-strong: #CFD6E0;
  --brand: #1B3A6B;
  --brand-ink: #FFFFFF;
  --accent: #1F8A7E;
  --accent-soft: #E6F4F2;
  --gold: #D99A00;
  --gold-soft: #FFF6DB;
  --danger: #C2410C;
  --ok: #15803D;
  --top: #0F1B2D;
  --top-ink: #C9D3E1;
  --paper: #FFFDF6;
  --paper-rule: #E5ECF3;
  --pen: #1B3A6B;
  --pen-red: #C62828;
  --shadow-sm: 0 1px 2px rgba(16,24,40,.05);
  --shadow: 0 12px 32px -12px rgba(16,24,40,.18), 0 2px 6px rgba(16,24,40,.04);
  --scrim: rgba(10,16,28,.45);

  --f-display: "Poppins", "Segoe UI", system-ui, sans-serif;
  --f-body: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  --f-hand: "Caveat", "Comic Sans MS", cursive;
  --r: 12px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0B111C; --bg-soft: #0F1724; --surface: #141D2C; --ink: #E8EDF4; --ink-2: #C3CCD9; --muted: #8C97A8;
    --line: #222D3F; --line-strong: #2E3B50; --brand: #8FB3EA; --brand-ink: #0B111C; --accent: #3FBFAF; --accent-soft: #10302D;
    --gold: #F0B429; --gold-soft: #2E2510; --danger: #FB923C; --ok: #4ADE80; --top: #070B13; --top-ink: #9AA7BA;
    --paper: #152034; --paper-rule: #1F2C42; --pen: #E3EAF4; --pen-red: #FF8A80;
    --shadow-sm: 0 1px 2px rgba(0,0,0,.4); --shadow: 0 16px 40px -14px rgba(0,0,0,.6); --scrim: rgba(0,0,0,.6);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0B111C; --bg-soft: #0F1724; --surface: #141D2C; --ink: #E8EDF4; --ink-2: #C3CCD9; --muted: #8C97A8;
  --line: #222D3F; --line-strong: #2E3B50; --brand: #8FB3EA; --brand-ink: #0B111C; --accent: #3FBFAF; --accent-soft: #10302D;
  --gold: #F0B429; --gold-soft: #2E2510; --danger: #FB923C; --ok: #4ADE80; --top: #070B13; --top-ink: #9AA7BA;
  --paper: #152034; --paper-rule: #1F2C42; --pen: #E3EAF4; --pen-red: #FF8A80;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.4); --shadow: 0 16px 40px -14px rgba(0,0,0,.6); --scrim: rgba(0,0,0,.6);
  color-scheme: dark;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 16px/1.6 var(--f-body);
  -webkit-font-smoothing: antialiased;
}

.sb-body {
  background: var(--bg);
  color: var(--ink);
  min-height: 100vh;
}

.wrap {
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: 24px;
}

svg.i {
  width: 18px;
  height: 18px;
  flex: none;
  display: inline-block;
  vertical-align: middle;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 20px;
  border-radius: 10px;
  border: 1px solid transparent;
  font: 600 14.5px/1 var(--f-display);
  text-decoration: none;
  cursor: pointer;
  transition: background-color .15s, border-color .15s, transform .15s;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-dark { background: var(--ink); color: var(--bg); }
.btn-dark:hover { background: var(--ink-2); color: var(--bg); }
.btn-accent { background: var(--accent); color: #fff; }
:root[data-theme="dark"] .btn-accent { color: #06201D; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .btn-accent { color: #06201D; } }
.btn-accent:hover { filter: brightness(1.06); color: #fff; }
.btn-ghost { background: var(--surface); border-color: var(--line-strong); color: var(--ink); }
.btn-ghost:hover { border-color: var(--ink); color: var(--ink); }
.btn-sm { min-height: 38px; padding: 0 14px; font-size: 13.5px; }
.btn-block { width: 100%; }

.icon-btn {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--surface);
  display: grid;
  place-items: center;
  cursor: pointer;
  position: relative;
  color: var(--ink);
  transition: border-color .15s;
}
.icon-btn:hover { border-color: var(--line-strong); }
.count {
  position: absolute;
  top: -6px;
  right: -6px;
  min-width: 19px;
  height: 19px;
  padding: 0 5px;
  border-radius: 99px;
  background: var(--danger);
  color: #fff;
  font: 600 11px/19px var(--f-body);
  text-align: center;
}
.tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: 99px;
  font: 500 12px/1.5 var(--f-body);
  white-space: nowrap;
  background: var(--bg-soft);
  color: var(--ink-2);
  border: 1px solid var(--line);
}
.tag-accent { background: var(--accent-soft); color: var(--accent); border-color: transparent; }
.tag-gold { background: var(--gold-soft); color: var(--gold); border-color: transparent; }
.eyebrow { font: 600 12.5px/1 var(--f-display); letter-spacing: .12em; text-transform: uppercase; color: var(--accent); }

/* ---------- Utility bar ---------- */
.topbar { background: var(--top); color: var(--top-ink); font-size: 13px; }
.topbar .wrap { display: flex; justify-content: space-between; align-items: center; gap: 16px; min-height: 36px; }
.topbar a { color: var(--top-ink); text-decoration: none; display: inline-flex; align-items: center; gap: 6px; }
.topbar a:hover { color: #fff; }
.top-left, .top-right { display: flex; gap: 18px; align-items: center; }
.top-right svg { width: 15px; height: 15px; }
.top-note b { color: #fff; font-weight: 600; }

/* ---------- Header / mega menu ---------- */
header.site {
  position: sticky;
  top: 0;
  z-index: 60;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; gap: 20px; min-height: 70px; }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; flex: none; }
.logo-mark {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: #1B3A6B;
  color: #fff;
  display: grid;
  place-items: center;
  font: 700 15px/1 var(--f-display);
  letter-spacing: -.02em;
}
.logo-text { font: 700 18px/1 var(--f-display); color: var(--ink); }
.logo-text small { display: block; font: 500 11px/1.4 var(--f-body); color: var(--muted); letter-spacing: .02em; margin-top: 3px; }
.menu { display: flex; align-items: center; gap: 2px; list-style: none; margin: 0 0 0 auto; padding: 0; }
.menu > li { position: relative; }
.menu > li > a, .menu > li > button {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 10px 12px;
  border-radius: 8px;
  border: 0;
  background: none;
  cursor: pointer;
  text-decoration: none;
  font: 500 14.5px/1 var(--f-display);
  color: var(--ink-2);
}
.menu > li > a:hover, .menu > li > button:hover, .menu > li.open > button { background: var(--bg-soft); color: var(--ink); }
.menu .chev { width: 14px; height: 14px; transition: transform .2s; }
.menu li.open .chev { transform: rotate(180deg); }
.actions { display: flex; align-items: center; gap: 10px; flex: none; }
.mega {
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%);
  width: min(680px, 92vw);
  display: none;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow);
  overflow: hidden;
  grid-template-columns: 220px 1fr;
  z-index: 100;
}
.menu > li.open .mega { display: grid; }
.mega-side { background: var(--bg-soft); padding: 10px; display: grid; gap: 4px; align-content: start; border-right: 1px solid var(--line); }
.mega-cat { text-align: left; border: 0; background: none; border-radius: 10px; padding: 12px 14px; cursor: pointer; display: grid; gap: 2px; }
.mega-cat b { font: 600 14.5px/1.3 var(--f-display); color: var(--ink); }
.mega-cat span { font-size: 12.5px; color: var(--muted); }
.mega-cat[aria-selected="true"] { background: var(--surface); box-shadow: var(--shadow-sm); }
.mega-cat[aria-selected="true"] b { color: var(--accent); }
.mega-main { padding: 14px; display: grid; grid-template-columns: 1fr 1fr; gap: 10px; align-content: start; }
.mega-item { display: flex; gap: 12px; align-items: flex-start; padding: 12px; border: 1px solid var(--line); border-radius: 12px; text-decoration: none; transition: border-color .15s, background-color .15s; }
.mega-item:hover { border-color: var(--accent); background: var(--bg-soft); }
.mega-item b { display: block; font: 600 14px/1.3 var(--f-display); color: var(--ink); }
.mega-item span { font-size: 12.5px; color: var(--muted); line-height: 1.4; }
.mi-ico { width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center; flex: none; }
.mi-ico svg { width: 19px; height: 19px; }
.c-blue { background: #E8F0FB; color: #1B3A6B; } .c-teal { background: #E3F4F1; color: #17766B; } .c-amber { background: #FFF3D6; color: #9A6B00; } .c-rose { background: #FDE8E8; color: #B42318; } .c-violet { background: #EFE9FB; color: #5B3BA8; }
:root[data-theme="dark"] .c-blue { background: #182A46; color: #9CC0F5; } :root[data-theme="dark"] .c-teal { background: #12312D; color: #5FD3C3; } :root[data-theme="dark"] .c-amber { background: #33280F; color: #F5C451; } :root[data-theme="dark"] .c-rose { background: #3A1A1A; color: #FCA5A5; } :root[data-theme="dark"] .c-violet { background: #261C3D; color: #C4B5FD; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .c-blue { background: #182A46; color: #9CC0F5; } :root:not([data-theme="light"]) .c-teal { background: #12312D; color: #5FD3C3; } :root:not([data-theme="light"]) .c-amber { background: #33280F; color: #F5C451; } :root:not([data-theme="light"]) .c-rose { background: #3A1A1A; color: #FCA5A5; } :root:not([data-theme="light"]) .c-violet { background: #261C3D; color: #C4B5FD; } }
.mega-foot { grid-column: 1 / -1; display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 12px 14px; border-top: 1px solid var(--line); font-size: 13px; color: var(--muted); }
.mega-foot a { color: var(--accent); font-weight: 600; text-decoration: none; cursor: pointer; }
.mega.simple { grid-template-columns: 1fr; width: min(560px, 92vw); }
.user-chip { display: inline-flex; align-items: center; gap: 8px; padding: 4px 12px 4px 4px; border-radius: 99px; border: 1px solid var(--line); background: var(--surface); cursor: pointer; font: 500 13.5px/1 var(--f-display); }
.avatar { width: 32px; height: 32px; border-radius: 50%; background: var(--accent); color: #fff; display: grid; place-items: center; font: 600 13px/1 var(--f-display); }
.theme-sun { display: none; }
:root[data-theme="dark"] .theme-sun { display: block; } :root[data-theme="dark"] .theme-moon { display: none; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .theme-sun { display: block; } :root:not([data-theme="light"]) .theme-moon { display: none; } }
.burger { display: none; }

/* ---------- Hero ---------- */
.hero {
  padding-block: 64px 56px;
  border-bottom: 1px solid var(--line);
  background: radial-gradient(800px 320px at 90% 0%, color-mix(in srgb, var(--accent) 9%, transparent), transparent 70%), var(--bg);
  color: var(--ink);
}
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.hero-copy { display: grid; gap: 22px; min-width: 0; }
.hero-kicker { display: inline-flex; align-items: center; gap: 8px; width: fit-content; padding: 6px 12px 6px 6px; border-radius: 99px; border: 1px solid var(--line); background: var(--surface); font-size: 13px; color: var(--ink-2); }
.hero-kicker b { background: var(--gold-soft); color: var(--gold); padding: 3px 8px; border-radius: 99px; font: 600 11.5px/1.3 var(--f-display); }
.hero h1 { font-size: clamp(34px, 4.6vw, 54px); font-weight: 700; letter-spacing: -.025em; color: var(--ink); }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero .lead { font-size: 18px; color: var(--muted); max-width: 52ch; line-height: 1.6; }
.hero .lead b { color: var(--ink); font-weight: 600; }
.row-flex { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.proof { display: grid; grid-template-columns: repeat(3, auto); justify-content: start; gap: 28px; padding-top: 8px; }
.proof div { display: grid; gap: 2px; }
.proof b { font: 700 22px/1.1 var(--f-display); color: var(--ink); font-variant-numeric: tabular-nums; }
.proof span { font-size: 13px; color: var(--muted); font-weight: 500; }

/* When Hero has a dark background (either dark theme or dark fallback gradient) */
.hero[style*="background"],
.hero.dark,
:root[data-theme="dark"] .hero,
[data-theme="dark"] .hero {
  color: #fff;
}
:root[data-theme="dark"] .hero h1,
[data-theme="dark"] .hero h1 {
  color: #FFFFFF;
}
:root[data-theme="dark"] .hero .lead,
[data-theme="dark"] .hero .lead {
  color: #CBD5E1;
}
:root[data-theme="dark"] .hero .lead b,
[data-theme="dark"] .hero .lead b {
  color: #FFFFFF;
}
:root[data-theme="dark"] .proof b,
[data-theme="dark"] .proof b {
  color: #FFFFFF;
}
:root[data-theme="dark"] .proof span,
[data-theme="dark"] .proof span {
  color: #94A3B8;
}

.stack { position: relative; min-width: 0; display: grid; gap: 14px; }
.s-card { background: var(--surface, #FFFFFF); border: 1px solid var(--line, #E2E8F0); border-radius: 16px; box-shadow: var(--shadow); padding: 16px; display: flex; gap: 14px; align-items: center; color: var(--ink, #0F172A); }
.s-card.notes { display: block; padding: 0; overflow: hidden; background: var(--paper);
  background-image: repeating-linear-gradient(to bottom, transparent 0 29px, var(--paper-rule) 29px 30px); background-position: 0 44px; }
.notes-head { display: flex; justify-content: space-between; align-items: center; padding: 10px 16px; background: #1B3A6B; color: #fff; font: 600 13px/1.2 var(--f-display); }
.notes-body { padding: 8px 18px 14px 18px; font: 600 21px/30px var(--f-hand); color: var(--pen); }
.notes-body .r { color: var(--pen-red); }
.notes-body mark { background: color-mix(in srgb, var(--gold) 38%, transparent); color: inherit; padding: 0 4px; border-radius: 3px; }
.s-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.s-card .meta { min-width: 0; }
.s-card .meta b { display: block; font: 600 14px/1.3 var(--f-display); color: var(--ink, #0F172A) !important; }
.s-card .meta span { font-size: 12.5px; color: var(--muted, #64748B) !important; font-weight: 500; }
:root[data-theme="dark"] .s-card,
[data-theme="dark"] .s-card {
  background: #141D2C;
  border-color: #222D3F;
  color: #E8EDF4;
}
:root[data-theme="dark"] .s-card .meta b,
[data-theme="dark"] .s-card .meta b {
  color: #F8FAFC !important;
}
:root[data-theme="dark"] .s-card .meta span,
[data-theme="dark"] .s-card .meta span {
  color: #94A3B8 !important;
}
.mini-book { width: 46px; height: 60px; border-radius: 3px 6px 6px 3px; background: linear-gradient(90deg, rgba(0,0,0,.25) 0 4px, transparent 4px), #1B3A6B; flex: none; position: relative; }
.mini-book::after { content: "SB"; position: absolute; inset: auto 0 8px; text-align: center; color: #F0B429; font: 700 11px/1 var(--f-display); }
.mini-play { width: 46px; height: 46px; border-radius: 12px; background: var(--accent-soft); color: var(--accent); display: grid; place-items: center; flex: none; }

/* ---------- Sections ---------- */
.sec { padding-block: 72px; }
.sec-soft { background: var(--bg-soft); border-block: 1px solid var(--line); }
.sec-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 24px; flex-wrap: wrap; margin-bottom: 28px; }
.sec-head > div { display: grid; gap: 8px; max-width: 640px; }
.sec-head h2 { font-size: clamp(26px, 3vw, 34px); letter-spacing: -.015em; }
.sec-head p { color: var(--muted); }

/* Course picker */
.picker { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; padding: 16px 0; }
.picker > span { font: 600 14px/1 var(--f-display); color: var(--ink); }
.seg { display: flex; flex-wrap: wrap; gap: 6px; padding: 4px; background: var(--bg-soft); border: 1px solid var(--line); border-radius: 12px; }
.seg button { border: 0; background: none; padding: 9px 14px; border-radius: 9px; cursor: pointer; font: 500 13.5px/1 var(--f-display); color: var(--ink-2); transition: background-color .15s; }
.seg button[aria-pressed="true"], .seg button.active { background: var(--surface); color: var(--ink); box-shadow: var(--shadow-sm); font-weight: 600; }
.picker-wrap { position: sticky; top: 70px; z-index: 30; background: color-mix(in srgb, var(--bg) 94%, transparent); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }

/* Lecture cards */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.lec { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; overflow: hidden; display: flex; flex-direction: column; transition: border-color .2s, box-shadow .2s, transform .2s; min-width: 0; }
.lec:hover { border-color: var(--line-strong); box-shadow: var(--shadow); transform: translateY(-2px); }
.lec-cover { aspect-ratio: 16 / 8; max-width: 100%; position: relative; padding: 18px; display: flex; flex-direction: column; justify-content: space-between; color: #fff; }
.lec-cover b { font: 700 21px/1.15 var(--f-display); max-width: 15ch; }
.lec-cover .tag { background: rgba(255,255,255,.16); color: #fff; border-color: rgba(255,255,255,.25); width: fit-content; }
.lec-cover .play { position: absolute; right: 16px; bottom: 16px; width: 42px; height: 42px; border-radius: 50%; background: rgba(255,255,255,.18); display: grid; place-items: center; }
.cv-caf { background: linear-gradient(135deg, #1B3A6B, #274F8E); }
.cv-cai { background: linear-gradient(135deg, #12584F, #1F8A7E); }
.cv-caF { background: linear-gradient(135deg, #0F2A4A, #1B5E6B); }
.cv-cmi { background: linear-gradient(135deg, #7A5300, #B07D0A); }
.cv-cmF { background: linear-gradient(135deg, #5C3A00, #8C5E07); }
.cv-cs  { background: linear-gradient(135deg, #3E2A78, #5B3BA8); }
.lec-body { padding: 18px; display: grid; gap: 12px; flex: 1; align-content: start; }
.lec-body h3 { font-size: 17px; font-weight: 600; margin: 0; }
.specs { display: flex; flex-wrap: wrap; gap: 6px; }
.lec-foot { padding: 14px 18px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.price { font: 700 19px/1 var(--f-display); font-variant-numeric: tabular-nums; color: var(--ink); }
.price s { font: 400 13px/1 var(--f-body); color: var(--muted); margin-left: 6px; }
.via { font-size: 12.5px; color: var(--muted); display: flex; align-items: center; gap: 6px; }
.via b { color: var(--ink-2); font-weight: 600; }
.empty { grid-column: 1 / -1; padding: 28px; border: 1px dashed var(--line-strong); border-radius: 14px; text-align: center; color: var(--muted); }

/* Books */
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.book { display: flex; flex-direction: column; gap: 14px; min-width: 0; }
.book-shelf { background: var(--bg-soft); border: 1px solid var(--line); border-radius: 16px; padding: 26px 0 22px; display: grid; place-items: center; }
.cover { width: 62%; aspect-ratio: 3 / 4.1; max-width: 100%; border-radius: 4px 10px 10px 4px; position: relative; padding: 14px 12px 12px 18px; display: flex; flex-direction: column; justify-content: space-between; color: #fff;
  box-shadow: 0 18px 30px -16px rgba(0,0,0,.55), inset 6px 0 0 rgba(0,0,0,.22); transition: transform .25s; }
.book:hover .cover { transform: translateY(-4px) rotate(-1deg); }
.cover small { font: 600 9.5px/1.2 var(--f-display); letter-spacing: .12em; text-transform: uppercase; opacity: .85; }
.cover b { font: 700 15px/1.15 var(--f-display); }
.cover i { font: 700 18px/1 var(--f-hand); color: #F5C451; font-style: normal; }
.book h3 { font-size: 15.5px; font-weight: 600; margin: 0; }
.book p { font-size: 13.5px; color: var(--muted); margin: 0; }
.book .row-flex { justify-content: space-between; }

/* AI tools */
.tools { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.tool { text-align: left; background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 20px; display: grid; gap: 12px; cursor: pointer; transition: border-color .2s, box-shadow .2s; min-width: 0; }
.tool:hover { border-color: var(--accent); box-shadow: var(--shadow); }
.tool-top { display: flex; justify-content: space-between; align-items: center; }
.tool h3 { font-size: 16.5px; font-weight: 600; margin: 0; }
.tool p { font-size: 14px; color: var(--muted); margin: 0; }
.tool .go { font: 600 13.5px/1 var(--f-display); color: var(--accent); display: inline-flex; align-items: center; gap: 6px; }
.tool[disabled] { cursor: default; opacity: .7; }
.tool[disabled]:hover { border-color: var(--line); box-shadow: none; }
.login-banner { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; padding: 16px 20px; margin-bottom: 20px; border-radius: 14px; border: 1px solid var(--line); background: var(--surface); }
.login-banner p { color: var(--ink-2); font-size: 14.5px; display: flex; gap: 10px; align-items: center; margin: 0; }

/* Free resources */
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin-bottom: 24px; overflow-x: auto; }
.tabs button { border: 0; background: none; padding: 12px 16px; margin-bottom: -1px; border-bottom: 2px solid transparent; cursor: pointer; font: 600 14.5px/1 var(--f-display); color: var(--muted); white-space: nowrap; display: inline-flex; gap: 8px; align-items: center; }
.tabs button[aria-selected="true"], .tabs button.active { color: var(--ink); border-bottom-color: var(--accent); }
.list { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.li { display: flex; align-items: center; gap: 14px; padding: 14px 16px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); min-width: 0; text-decoration: none; color: inherit; }
a.li:hover { border-color: var(--line-strong); color: inherit; }
.li .meta { flex: 1; min-width: 0; }
.li b { display: block; font: 600 14.5px/1.35 var(--f-display); }
.li span { font-size: 12.5px; color: var(--muted); }
.thumb { width: 92px; aspect-ratio: 16 / 9; border-radius: 8px; flex: none; display: grid; place-items: center; color: #fff; }
.thumb svg { width: 20px; height: 20px; }

/* About + contact */
.about { display: grid; grid-template-columns: 340px 1fr; gap: 48px; align-items: center; }
.portrait { aspect-ratio: 4 / 5; max-width: 100%; border-radius: 20px; background: linear-gradient(160deg, #1B3A6B, #0F2240 70%); color: #fff; display: grid; place-items: center; position: relative; overflow: hidden; margin: 0; }
.portrait .mono { font: 700 96px/1 var(--f-display); letter-spacing: -.04em; }
.portrait .mono span { color: #F0B429; }
.portrait figcaption { position: absolute; left: 14px; right: 14px; bottom: 14px; font-size: 12px; color: #B9C7DC; text-align: center; }
.about-copy { display: grid; gap: 18px; min-width: 0; }
.about-copy h2 { font-size: clamp(26px, 3vw, 34px); }
.about-copy p { color: var(--ink-2); font-size: 16.5px; max-width: 62ch; margin: 0; }
.sig { font: 700 32px/1 var(--f-hand); color: var(--accent); }
.facts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.facts div { border: 1px solid var(--line); border-radius: 12px; padding: 14px; background: var(--surface); }
.facts b { display: block; font: 700 20px/1.1 var(--f-display); font-variant-numeric: tabular-nums; }
.facts span { font-size: 12.5px; color: var(--muted); }
.contact { display: grid; grid-template-columns: 1fr 1.1fr; gap: 40px; align-items: start; }
.channels { display: grid; gap: 12px; }
.form { display: grid; gap: 14px; background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 24px; }
.field { display: grid; gap: 6px; min-width: 0; }
.field label { font: 500 13.5px/1.2 var(--f-display); color: var(--ink); }
input.sb-input, select.sb-select, textarea.sb-textarea {
  width: 100%;
  font: 400 15px/1.4 var(--f-body);
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  padding: 11px 12px;
  min-height: 44px;
}
textarea.sb-textarea { min-height: 100px; resize: vertical; }
input.sb-input:focus, select.sb-select:focus, textarea.sb-textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: transparent; }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.msg { font-size: 14px; padding: 10px 12px; border-radius: 10px; background: var(--accent-soft); color: var(--ink); }

/* Footer */
footer.site { border-top: 1px solid var(--line); padding-block: 56px 24px; background: var(--bg-soft); }
.foot { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 32px; }
.foot h4 { font-size: 13px; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin-bottom: 14px; }
.foot ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 9px; }
.foot a { color: var(--ink-2); text-decoration: none; font-size: 14.5px; }
.foot a:hover { color: var(--accent); }
.foot p { color: var(--muted); font-size: 14px; margin-top: 12px; max-width: 34ch; }
.socials { display: flex; gap: 8px; margin-top: 16px; }
.socials a { width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--line); display: grid; place-items: center; background: var(--surface); color: inherit; }
.socials svg { width: 17px; height: 17px; }
.legal { margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-size: 13px; color: var(--muted); }
.legal a { color: var(--muted); text-decoration: none; }

.wa-fab {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 55;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: #25D366;
  color: #fff;
  display: grid;
  place-items: center;
  box-shadow: 0 10px 24px -8px rgba(0,0,0,.4);
  text-decoration: none;
  transition: transform .2s;
}
.wa-fab:hover { transform: scale(1.08); color: #fff; }
.wa-fab svg { width: 28px; height: 28px; }

/* ---------- Dialogs & drawer ---------- */
.sb-dialog-backdrop {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: var(--scrim);
  backdrop-filter: blur(2px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.sb-dialog {
  border: 0;
  padding: 0;
  border-radius: 18px;
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow);
  width: min(460px, 94vw);
  max-height: calc(100vh - 48px);
  overflow-y: auto;
  position: relative;
}
.sb-dialog.wide { width: min(880px, 94vw); }
.dlg-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 18px 22px; border-bottom: 1px solid var(--line); position: sticky; top: 0; background: var(--surface); z-index: 2; }
.dlg-head h3 { font-size: 18px; margin: 0; }
.dlg-body { padding: 22px; display: grid; gap: 16px; }
.x { width: 36px; height: 36px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface); cursor: pointer; display: grid; place-items: center; color: var(--ink); }
.google { display: flex; align-items: center; justify-content: center; gap: 10px; min-height: 46px; border: 1px solid var(--line-strong); border-radius: 10px; background: var(--surface); cursor: pointer; font: 600 14.5px/1 var(--f-display); }
.or { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: 12.5px; }
.or::before, .or::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.perks { display: grid; gap: 6px; font-size: 13.5px; color: var(--ink-2); padding: 12px 14px; border-radius: 12px; background: var(--bg-soft); }
.perks div { display: flex; gap: 8px; align-items: center; }
.perks svg { color: var(--accent); }
.demo-note { font-size: 12.5px; color: var(--gold); background: var(--gold-soft); padding: 8px 10px; border-radius: 8px; }
.small { font-size: 12.5px; color: var(--muted); margin: 0; }

.drawer { position: fixed; inset: 0; z-index: 90; display: none; }
.drawer.open { display: block; }
.drawer .scrim { position: absolute; inset: 0; background: var(--scrim); }
.drawer .panel { position: absolute; top: 0; right: 0; bottom: 0; width: min(420px, 100vw); background: var(--surface); display: flex; flex-direction: column; box-shadow: var(--shadow); }
.cart-items { flex: 1; overflow-y: auto; padding: 8px 22px; }
.ci { display: flex; gap: 12px; align-items: center; padding: 14px 0; border-bottom: 1px solid var(--line); }
.ci .meta { flex: 1; min-width: 0; }
.ci b { display: block; font: 600 14px/1.3 var(--f-display); }
.ci span { font-size: 12.5px; color: var(--muted); }
.qty { display: flex; align-items: center; border: 1px solid var(--line); border-radius: 8px; }
.qty button { width: 30px; height: 30px; border: 0; background: none; cursor: pointer; }
.qty output { min-width: 22px; text-align: center; font-variant-numeric: tabular-nums; font-size: 14px; }
.cart-foot { padding: 18px 22px; border-top: 1px solid var(--line); display: grid; gap: 12px; }
.total { display: flex; justify-content: space-between; font: 700 17px/1 var(--f-display); font-variant-numeric: tabular-nums; }

.toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%) translateY(20px); opacity: 0; background: var(--ink); color: var(--bg); padding: 12px 18px; border-radius: 12px; font-size: 14px; z-index: 120; transition: opacity .2s, transform .2s; pointer-events: none; max-width: calc(100vw - 32px); }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- Tool internals ---------- */
.fg { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 12px; }
.kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 10px; }
.kpi { background: var(--bg-soft); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; }
.kpi b { display: block; font: 700 24px/1.1 var(--f-display); font-variant-numeric: tabular-nums; color: var(--ink); }
.kpi span { font-size: 12.5px; color: var(--muted); }
.tw { overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; }
table.sb-table { width: 100%; border-collapse: collapse; font-size: 14px; }
table.sb-table th, table.sb-table td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.sb-table th { background: var(--bg-soft); font: 600 12px/1.3 var(--f-display); letter-spacing: .05em; text-transform: uppercase; color: var(--muted); }
table.sb-table tr:last-child td { border-bottom: 0; }
td.n { font-variant-numeric: tabular-nums; white-space: nowrap; }
.pr { font: 700 11.5px/1 var(--f-display); padding: 5px 8px; border-radius: 6px; color: #fff; display: inline-block; }
.pr-A { background: #C2410C; } .pr-B { background: #B7791F; } .pr-C { background: #15803D; }
.answer { background: var(--paper); border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; font: 600 20px/1.45 var(--f-hand); color: var(--pen); white-space: pre-wrap; overflow-wrap: anywhere; }
.answer .h { color: var(--pen-red); text-decoration: underline; text-underline-offset: 3px; }
.mcq-q { font: 600 16.5px/1.45 var(--f-display); }
.opts { display: grid; gap: 8px; }
.opt { text-align: left; padding: 12px 14px; border-radius: 10px; border: 1px solid var(--line); background: var(--bg); cursor: pointer; display: flex; gap: 12px; font-size: 15px; }
.opt b { color: var(--muted); font-family: var(--f-display); }
.opt:hover:not(:disabled) { border-color: var(--accent); }
.opt.right { border-color: var(--ok); background: color-mix(in srgb, var(--ok) 12%, var(--bg)); }
.opt.wrong { border-color: var(--danger); background: color-mix(in srgb, var(--danger) 10%, var(--bg)); }
.opt:disabled { cursor: default; }
.explain { border-left: 3px solid var(--gold); background: var(--gold-soft); padding: 12px 14px; border-radius: 0 10px 10px 0; font-size: 14.5px; color: var(--ink); }
.bar { height: 5px; background: var(--line); border-radius: 99px; overflow: hidden; }
.bar i { display: block; height: 100%; background: var(--accent); transition: width .3s; }
.gap-row { display: grid; grid-template-columns: 1fr 170px; gap: 10px; align-items: center; padding: 6px 0; border-bottom: 1px dashed var(--line); font-size: 14.5px; }
.cd { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; text-align: center; }
.cd div { background: #1B3A6B; color: #fff; border-radius: 12px; padding: 16px 6px; }
.cd b { display: block; font: 700 clamp(26px, 4vw, 40px)/1 var(--f-display); font-variant-numeric: tabular-nums; }
.cd span { font-size: 11.5px; letter-spacing: .1em; text-transform: uppercase; color: #B9C7DC; }

/* Responsive adjustments */
@media (max-width: 1080px) {
  .menu { display: none; }
  .burger { display: grid; }
  .actions { margin-left: auto; }
  .hero-grid, .about, .contact { grid-template-columns: 1fr; }
  .grid-3, .tools { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .foot { grid-template-columns: 1fr 1fr; }
  .portrait { max-width: 320px; }
  .menu.mobile { display: flex; flex-direction: column; align-items: stretch; position: absolute; left: 0; right: 0; top: 100%; background: var(--bg); border-bottom: 1px solid var(--line); padding: 10px 16px 18px; margin: 0; box-shadow: var(--shadow); }
  .menu.mobile > li > a, .menu.mobile > li > button { width: 100%; justify-content: space-between; padding: 14px 12px; font-size: 15.5px; }
  .menu.mobile .mega { position: static; transform: none; width: auto; box-shadow: none; border-radius: 12px; margin: 4px 0 8px; grid-template-columns: 1fr; }
  .menu.mobile .mega-side { display: none; }
  .menu.mobile .mega-main { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .wrap { padding-inline: 16px; }
  .sec { padding-block: 52px; }
  .top-left .hide-sm, .top-note { display: none; }
  .actions .login-btn-text { display: none; }
  .hero { padding-block: 40px; }
  .proof { grid-template-columns: repeat(3, 1fr); gap: 12px; }
  .proof b { font-size: 18px; }
  .s-pair { grid-template-columns: 1fr; }
  .grid-3, .tools, .list, .two, .facts { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: 1fr 1fr; gap: 14px; }
  .facts { grid-template-columns: 1fr 1fr; }
  .foot { grid-template-columns: 1fr; }
  .cover { width: 76%; }
  .gap-row { grid-template-columns: 1fr; }
  .cd { grid-template-columns: repeat(2, 1fr); }
  .logo-text small { display: none; }
  .picker > span { display: none; }
}

/* ============================================================
   nopCommerce Format 3-Tier Store Header Styles for SB Sir
   ============================================================ */
.nop-header-wrapper {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.08);
}

/* Tier 1: Top Bar / Header Selectors & Links */
.nop-top-header {
  background: #0F1B2D;
  color: #C9D3E1;
  font-size: 12.5px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding: 6px 0;
}
.nop-top-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.nop-top-left, .nop-top-right {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.nop-top-left a, .nop-top-right a, .nop-top-left span, .nop-top-right span {
  color: #C9D3E1;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.15s ease;
}
.nop-top-left a:hover, .nop-top-right a:hover {
  color: #F5C451;
}
.nop-announcement {
  background: rgba(245, 196, 81, 0.12);
  color: #F5C451 !important;
  padding: 2px 10px;
  border-radius: 99px;
  font-weight: 500;
}
.nop-theme-btn {
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #C9D3E1;
  border-radius: 6px;
  padding: 3px 8px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11.5px;
  transition: all 0.2s;
}
.nop-theme-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #FFFFFF;
}

/* Tier 2: Main Middle Header (Logo, Search Store Box, Helpline & Cart) */
.nop-main-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  padding: 12px 0;
}
.nop-main-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}

/* Brand Logo */
.nop-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}
.nop-logo .logo-mark {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: linear-gradient(135deg, #0B1F8A, #1B3A6B);
  color: #FFFFFF;
  display: grid;
  place-items: center;
  font: 800 17px/1 var(--f-display);
  letter-spacing: -0.02em;
  box-shadow: 0 4px 12px rgba(11, 31, 138, 0.25);
}
.nop-logo .logo-info {
  display: flex;
  flex-direction: column;
}
.nop-logo .brand-name {
  font: 800 22px/1.1 var(--f-display);
  color: var(--ink);
  letter-spacing: -0.02em;
}
.nop-logo .brand-sub {
  font: 500 11.5px/1.3 var(--f-body);
  color: var(--muted);
  letter-spacing: 0.02em;
  margin-top: 2px;
}

/* nopCommerce Store Search Box */
.nop-search-wrapper {
  flex: 1;
  max-width: 560px;
}
.nop-search-box {
  display: flex;
  position: relative;
  width: 100%;
}
.nop-search-input {
  flex: 1;
  height: 44px;
  padding: 0 16px;
  border: 2px solid #0B1F8A;
  border-right: none;
  border-radius: 8px 0 0 8px;
  background: var(--bg);
  color: var(--ink);
  font: 400 14px/1 var(--f-body);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.nop-search-input:focus {
  border-color: #1F6AE1;
  box-shadow: 0 0 0 3px rgba(31, 106, 225, 0.15);
}
.nop-search-btn {
  height: 44px;
  padding: 0 22px;
  background: #0B1F8A;
  color: #FFFFFF;
  border: 2px solid #0B1F8A;
  border-radius: 0 8px 8px 0;
  font: 600 14px/1 var(--f-display);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: background-color 0.15s, border-color 0.15s;
  white-space: nowrap;
}
.nop-search-btn:hover {
  background: #1F6AE1;
  border-color: #1F6AE1;
}

/* Helpline & Cart */
.nop-actions-right {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}
.nop-helpline {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  padding: 6px 14px;
  border-radius: 10px;
  background: #E8F5E9;
  border: 1px solid #C8E6C9;
  color: #1B5E20;
  transition: all 0.2s;
}
.nop-helpline:hover {
  background: #C8E6C9;
  color: #1B5E20;
}
.nop-helpline .hl-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: #25D366;
  color: #FFFFFF;
  display: grid;
  place-items: center;
  font-size: 16px;
}
.nop-helpline .hl-text {
  display: flex;
  flex-direction: column;
}
.nop-helpline .hl-text small {
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
  color: #2E7D32;
}
.nop-helpline .hl-text strong {
  font-size: 13px;
  font-weight: 700;
  color: #0F3E17;
}

.nop-cart-box {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  padding: 6px 14px;
  border-radius: 10px;
  background: var(--bg-soft);
  border: 1px solid var(--line-strong);
  color: var(--ink);
  transition: all 0.2s;
}
.nop-cart-box:hover {
  border-color: #0B1F8A;
  background: var(--surface);
}
.nop-cart-icon-wrapper {
  position: relative;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: #0B1F8A;
  color: #FFFFFF;
  display: grid;
  place-items: center;
  font-size: 15px;
}
.nop-cart-badge {
  position: absolute;
  top: -5px;
  right: -6px;
  min-width: 18px;
  height: 18px;
  padding: 0 4px;
  border-radius: 99px;
  background: #E11D48;
  color: #FFFFFF;
  font: 700 10.5px/18px var(--f-body);
  text-align: center;
}
.nop-cart-info {
  display: flex;
  flex-direction: column;
}
.nop-cart-info small {
  font-size: 11px;
  color: var(--muted);
  line-height: 1.2;
}
.nop-cart-info strong {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.2;
}

/* Tier 3: nopCommerce Category Top-Menu Bar */
.nop-nav-bar {
  background: #0B1F8A;
  box-shadow: 0 2px 8px rgba(11, 31, 138, 0.15);
}
.nop-nav-list {
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}
.nop-nav-item {
  position: relative;
}
.nop-nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 13px 16px;
  color: #FFFFFF;
  text-decoration: none;
  font: 600 13.5px/1 var(--f-display);
  letter-spacing: 0.3px;
  transition: background-color 0.15s, color 0.15s;
  white-space: nowrap;
}
.nop-nav-link:hover, .nop-nav-link.active {
  background: rgba(255, 255, 255, 0.12);
  color: #F5C451;
}
.nop-nav-link i.arrow {
  font-size: 10px;
  transition: transform 0.2s ease;
}
.nop-nav-item:hover .nop-nav-link i.arrow {
  transform: rotate(180deg);
}

/* Submenu / Dropdown */
.nop-sublist {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 250px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 0 0 10px 10px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
  list-style: none;
  padding: 8px 0;
  margin: 0;
  display: none;
  z-index: 120;
}
.nop-nav-item:hover .nop-sublist {
  display: block;
}
.nop-sublist li a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  color: var(--ink-2);
  text-decoration: none;
  font: 500 13.5px/1.3 var(--f-display);
  transition: background-color 0.15s, color 0.15s;
}
.nop-sublist li a:hover {
  background: var(--bg-soft);
  color: #0B1F8A;
}

@media (max-width: 991px) {
  .nop-top-header { display: none; }
  .nop-nav-bar { display: none; }
  .nop-search-wrapper { order: 3; max-width: 100%; width: 100%; margin-top: 10px; }
  .nop-main-inner { flex-wrap: wrap; }
}