@font-face { font-family: "Galada"; src: url(fonts/galada.woff2) format("woff2"); font-display: swap; }
@font-face { font-family: "Noto Sans Bengali"; src: url(fonts/noto-400.woff2) format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Noto Sans Bengali"; src: url(fonts/noto-600.woff2) format("woff2"); font-weight: 600; font-display: swap; }
@font-face { font-family: "Noto Sans Bengali"; src: url(fonts/noto-800.woff2) format("woff2"); font-weight: 800; font-display: swap; }

:root {
  --paper: #F1F1F4; --leaf: #FFFFFF; --leaf2: #F7F7FA; --sunk: #E6E5EC;
  --rule: #DEDDE6; --rule2: #C8C6D3;
  --ink: #17151F; --ink2: #4B4858; --ink3: #625E73;
  --board: #F2C230; --board2: #E3B220; --board-ink: #1A1712;
  --carbon: #4A3AA8; --carbon-press: #3B2E8C; --carbon-wash: #ECEAF8; --on-carbon: #FFFFFF;
  --rani: #B0184F; --rani-wash: #FBE5EC;
  --paid: #16734F; --paid-wash: #E1F2EA;
  --warn: #8A5A00; --warn-wash: #FBF0D9;
  --bezel: #17151F;
  --margin-red: #D9475E;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #100F16; --leaf: #1A1824; --leaf2: #1F1D2A; --sunk: #262433;
    --rule: #2B2939; --rule2: #3A374B;
    --ink: #ECEAF3; --ink2: #B7B3C7; --ink3: #9994AD;
    --board: #E9B92A; --board2: #D6A71C; --board-ink: #17140C;
    --carbon: #A99BF5; --carbon-press: #9585EE; --carbon-wash: #2A2548; --on-carbon: #120E2A;
    --rani: #F27FA6; --rani-wash: #3A1726;
    --paid: #5CC99A; --paid-wash: #143125;
    --warn: #E8B45A; --warn-wash: #2E2512;
    --bezel: #04030A;
    --margin-red: #E2697E;
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 64px; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: "Noto Sans Bengali", system-ui, sans-serif; font-size: 17px; line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; height: auto; }
a { color: var(--carbon); text-underline-offset: 3px; }
q { quotes: "“" "”"; font-weight: 600; color: var(--ink); }
h1, h2, h3 { line-height: 1.3; margin: 0; }
p { margin: 0; }

.mark { font-family: "Galada", "Noto Sans Bengali", serif; font-weight: 400; font-size: 34px; line-height: 1; letter-spacing: .01em; color: var(--board-ink); }
.mark.small { font-size: 26px; color: var(--ink); }

.board { background: var(--board); color: var(--board-ink); border-bottom: 3px solid var(--board2); }
.board-in { max-width: 1080px; margin: 0 auto; padding: max(14px, env(safe-area-inset-top)) 18px 0; }
.board-top { display: flex; align-items: center; justify-content: space-between; min-height: 52px; }
.help-link {
  color: var(--board-ink); font-weight: 600; font-size: 15px; text-decoration: none;
  padding: 8px 14px; border-radius: 999px; background: rgba(255, 255, 255, .55);
}
.hero { display: grid; gap: 28px; padding: 18px 0 0; }
.hero h1 { font-weight: 800; font-size: clamp(30px, 7.4vw, 50px); letter-spacing: -.005em; }
.hero h1 em { font-style: normal; color: var(--carbon-press); white-space: nowrap; }
@media (prefers-color-scheme: dark) { .hero h1 em { color: #2A1F78; } }
.lede { margin-top: 14px; font-size: 18px; color: #3A3428; max-width: 34em; }

.chit {
  margin: 24px 0 28px; background: var(--leaf); color: var(--ink);
  border-radius: 18px; padding: 16px; box-shadow: 0 1px 0 var(--board2), 0 14px 30px -18px rgba(60, 40, 0, .55);
  max-width: 460px;
}
.dl {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 60px; border-radius: 14px; background: var(--carbon); color: var(--on-carbon);
  font-weight: 800; font-size: 19px; text-decoration: none;
  transition: background .15s, transform .1s;
}
.dl:hover { background: var(--carbon-press); }
.dl:active { transform: translateY(1px); }
.dl svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }
.meta { display: grid; grid-template-columns: repeat(3, 1fr); margin: 14px 0 0; border-top: 1px dashed var(--rule2); }
.meta div { padding: 10px 4px 2px; text-align: center; border-left: 1px dashed var(--rule2); }
.meta div:first-child { border-left: 0; }
.meta dt { font-size: 12.5px; color: var(--ink3); }
.meta dd { margin: 0; font-weight: 600; font-size: 15px; line-height: 1.4; white-space: nowrap; }
.old { margin-top: 12px; font-size: 14px; color: var(--ink3); line-height: 1.55; }

.phone {
  margin: 0; width: min(250px, 66vw); border-radius: 30px; padding: 7px;
  background: var(--bezel); box-shadow: 0 24px 40px -26px rgba(20, 15, 40, .7);
}
.phone img { border-radius: 23px; width: 100%; }
.phone figcaption { color: var(--ink3); font-size: 14px; text-align: center; padding: 12px 0 2px; background: var(--paper); margin: 7px -7px -7px; border-radius: 0 0 30px 30px; }
.hero-phone { justify-self: center; margin-bottom: -120px; position: relative; z-index: 1; }

main { max-width: 1080px; margin: 0 auto; padding: 0 18px; }

.promises { padding: 150px 0 8px; }
.leaders { list-style: none; margin: 0 auto; padding: 0; max-width: 640px; }
.leaders li { display: flex; align-items: baseline; gap: 8px; padding: 7px 0; font-size: 17px; }
.leaders li span { color: var(--ink2); }
.leaders li::after { content: ""; order: 1; flex: 1; border-bottom: 2px dotted var(--rule2); transform: translateY(-5px); min-width: 20px; }
.leaders li b { order: 2; font-weight: 800; color: var(--paid); white-space: nowrap; }

.sec { padding: 56px 0 8px; }
.sec h2 { font-weight: 800; font-size: clamp(26px, 5.4vw, 36px); }
.kicker { display: block; font-size: 15px; font-weight: 600; color: var(--rani); margin-bottom: 4px; letter-spacing: .01em; }
.sub { margin-top: 10px; color: var(--ink2); max-width: 40em; }

.install { display: grid; gap: 28px; margin-top: 26px; align-items: start; }
.install .phone { justify-self: center; }

.ledger {
  list-style: none; counter-reset: line; margin: 0; padding: 0;
  background: var(--leaf); border: 1px solid var(--rule); border-radius: 16px; overflow: hidden;
}
.ledger li {
  counter-increment: line; position: relative;
  padding: 18px 18px 18px 74px; border-top: 1px solid var(--rule);
}
.ledger li:first-child { border-top: 0; }
.ledger::before { content: none; }
.ledger li::before {
  content: counter(line, bengali); position: absolute; left: 0; top: 0; bottom: 0; width: 56px;
  display: flex; justify-content: center; padding-top: 14px;
  font-weight: 800; font-size: 28px; line-height: 1.2; color: var(--rani);
  border-right: 3px double var(--margin-red); background: var(--leaf2);
}
.ledger h3 { font-weight: 800; font-size: 19px; }
.ledger p { margin-top: 4px; color: var(--ink2); }
.note {
  margin-top: 18px; padding: 14px 16px; border-radius: 14px; background: var(--carbon-wash); color: var(--ink2);
  max-width: 46em;
}

.tabs {
  position: sticky; top: 0; z-index: 5; display: flex; gap: 2px; overflow-x: auto; scrollbar-width: none;
  margin: 22px -18px 0; padding: 10px 18px; background: color-mix(in srgb, var(--paper) 92%, transparent);
  -webkit-backdrop-filter: saturate(1.4) blur(10px); backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--rule);
}
.tabs::-webkit-scrollbar { display: none; }
.tabs a {
  flex: none; padding: 7px 14px; border-radius: 10px; text-decoration: none; color: var(--ink2);
  font-weight: 600; font-size: 15.5px;
}
.tabs a:hover { background: var(--sunk); color: var(--ink); }

.chapter { display: grid; gap: 22px; padding: 40px 0 8px; border-bottom: 1px solid var(--rule); }
.chapter:last-of-type { border-bottom: 0; }
.shots {
  display: flex; gap: 14px; overflow-x: auto; scroll-snap-type: x mandatory; scrollbar-width: none;
  margin: 0 -18px; padding: 4px 18px 18px;
}
.shots::-webkit-scrollbar { display: none; }
.shots .phone { flex: none; width: min(220px, 58vw); scroll-snap-align: start; }
.words h3 { display: flex; align-items: baseline; gap: 12px; font-weight: 800; font-size: clamp(23px, 4.6vw, 29px); }
.num {
  display: inline-grid; place-items: center; width: 40px; height: 40px; flex: none; border-radius: 50%;
  border: 2px solid var(--rani); color: var(--rani); font-size: 20px; line-height: 1; transform: translateY(-3px);
}
.steps { list-style: bengali; margin: 14px 0 0; padding-left: 1.5em; color: var(--ink2); }
.steps li { padding-left: 6px; margin: 9px 0; }
.steps li::marker { color: var(--ink3); font-weight: 600; }
.tip {
  margin-top: 16px; padding: 13px 16px; border-left: 4px solid var(--board2); border-radius: 4px 12px 12px 4px;
  background: var(--warn-wash); color: var(--ink2); font-size: 16px;
}
.tip b { color: var(--ink); }

.faq { margin-top: 20px; background: var(--leaf); border: 1px solid var(--rule); border-radius: 16px; overflow: hidden; }
.faq details { border-top: 1px solid var(--rule); }
.faq details:first-child { border-top: 0; }
.faq summary {
  list-style: none; cursor: pointer; padding: 16px 52px 16px 18px; position: relative;
  font-weight: 600; font-size: 17.5px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: ""; position: absolute; right: 20px; top: 50%; width: 11px; height: 11px; margin-top: -8px;
  border-right: 2.2px solid var(--ink3); border-bottom: 2.2px solid var(--ink3); transform: rotate(45deg); transition: transform .2s;
}
.faq details[open] summary::after { transform: rotate(225deg); margin-top: -2px; }
.faq summary:hover { background: var(--leaf2); }
.faq details p { padding: 0 18px 18px; color: var(--ink2); max-width: 44em; }

.help {
  margin: 56px 0 8px; padding: 26px 22px; border-radius: 20px; background: var(--carbon); color: var(--on-carbon);
  display: grid; gap: 18px; align-items: center;
}
.help h2 { font-weight: 800; font-size: 26px; }
.help p { margin-top: 6px; opacity: .9; }
.wa {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 56px; padding: 0 22px;
  border-radius: 14px; background: #FFFFFF; color: #12603F; font-weight: 800; font-size: 18px; text-decoration: none; white-space: nowrap;
}
.wa svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 1.9; stroke-linejoin: round; }

.ad { display: flex; flex-direction: column; align-items: center; gap: 6px; margin: 40px auto 8px; }
.ad[hidden] { display: none; }
.ad-label { font-size: 12px; color: var(--ink3); letter-spacing: .04em; }
.ad iframe { border: 0; display: block; max-width: 100%; background: var(--sunk); border-radius: 6px; }
.ad-mid { margin: 28px auto 0; }
.house {
  display: grid; gap: 4px; width: min(340px, 100%); padding: 16px 18px; border-radius: 14px;
  border: 1.5px dashed var(--rule2); background: var(--leaf); color: var(--ink); text-decoration: none;
}
.house b { font-weight: 800; }
.house span { color: var(--ink3); font-size: 15px; }
.house i { font-style: normal; color: var(--carbon); font-weight: 600; font-size: 15px; }

.foot { max-width: 1080px; margin: 40px auto 0; padding: 26px 18px max(30px, env(safe-area-inset-bottom)); border-top: 1px solid var(--rule); color: var(--ink3); font-size: 15px; display: grid; gap: 4px; justify-items: start; }

@media (min-width: 860px) {
  .board-in { padding-left: 28px; padding-right: 28px; }
  main { padding: 0 28px; }
  .hero { grid-template-columns: 1fr 300px; gap: 48px; padding-top: 30px; align-items: end; }
  .hero-text { padding-bottom: 46px; }
  .hero-phone { width: 290px; margin-bottom: -150px; align-self: end; }
  .promises { padding-top: 70px; }
  .leaders { margin: 0; }
  .install { grid-template-columns: 1fr 260px; gap: 44px; }
  .install .phone { width: 260px; }
  .tabs { margin: 26px 0 0; padding: 10px 0; }
  .chapter { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 44px; align-items: start; padding-top: 52px; }
  .chapter:nth-of-type(even) .shots { order: 2; }
  .shots { margin: 0; padding: 4px 0 18px; overflow: visible; }
  .shots .phone { flex: 1 1 0; width: auto; min-width: 0; max-width: 220px; border-radius: 24px; padding: 5px; }
  .shots .phone img { border-radius: 19px; }
  .words { position: sticky; top: 80px; }
  .help { grid-template-columns: 1fr auto; padding: 30px 34px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; } }