/* ==========================================================
   DYUTI GROUP — shared styles
   Clean & professional · editorial · typography-led
   ========================================================== */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500&family=Inter:wght@300;400;500;600&family=JetBrains+Mono:wght@400;500&family=Noto+Serif+Bengali:wght@400;500;600&family=Noto+Naskh+Arabic:wght@400;500;600&display=swap');

:root, [data-theme="light"] {
  /* palette — clean white, professional */
  --paper: #FFFFFF;
  --paper-2: #F6F6F4;
  --paper-3: #ECECE8;
  --ink: #141A1F;
  --ink-soft: #3A4148;
  --accent: #1F3D2E;
  --accent-soft: #4A6B58;
  --gold: #A07A26;
  --muted: #7C8388;
  --rule: rgba(20, 26, 31, 0.10);
  --rule-strong: rgba(20, 26, 31, 0.28);

  --ochre: var(--gold);
  --ochre-soft: var(--accent-soft);
  --clay: var(--accent);
  --forest: var(--accent);
}

[data-theme="dark"] {
  --paper: #0F1416;
  --paper-2: #171D20;
  --paper-3: #1F262A;
  --ink: #F2EFE8;
  --ink-soft: #C2C7C2;
  --accent: #87B099;
  --accent-soft: #A8C4B4;
  --gold: #D4AC52;
  --muted: #7E8580;
  --rule: rgba(242, 239, 232, 0.12);
  --rule-strong: rgba(242, 239, 232, 0.32);
}

:root {

  /* type */
  --display: 'Cormorant Garamond', 'Iowan Old Style', Georgia, serif;
  --body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, monospace;

  /* metrics */
  --gutter: clamp(48px, 5.5vw, 88px);
}
[data-lang="bn"] .hero-headline,
[data-lang="bn"] h1, [data-lang="bn"] h2, [data-lang="bn"] h3 {
  line-height: 1.25 !important;
}
[data-lang="bn"] .hero-headline .line { line-height: 1.3 !important; padding-bottom: 0.1em; }
[data-lang="ar"] .hero-headline,
[data-lang="ar"] h1, [data-lang="ar"] h2, [data-lang="ar"] h3 {
  line-height: 1.35 !important;
}
:root {
  --max: 1440px;
}

[data-lang="bn"] {
  --display: 'Noto Serif Bengali', 'Cormorant Garamond', Georgia, serif;
  --body: 'Noto Serif Bengali', 'Inter', sans-serif;
}
[data-lang="ar"] {
  --display: 'Noto Naskh Arabic', 'Cormorant Garamond', Georgia, serif;
  --body: 'Noto Naskh Arabic', 'Inter', sans-serif;
}
[data-lang="ar"] body { direction: rtl; }

/* ---------- base ---------- */
* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.55;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
body { min-height: 100vh; overflow-x: hidden; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
::selection { background: var(--accent); color: var(--paper); }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }

.mono { font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.display { font-family: var(--display); font-weight: 500; letter-spacing: -0.01em; line-height: 1.02; }

h1, h2, h3, h4 { margin: 0; font-weight: 500; }

/* ---------- subtle paper texture ---------- */
.grain::before {
  content: ""; position: fixed; inset: 0;
  pointer-events: none; z-index: 1000;
  opacity: 0.18;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.09  0 0 0 0 0.13  0 0 0 0 0.11  0 0 0 0.18 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}

/* ========================== NAV ========================== */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in oklab, var(--paper) 88%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--rule);
}
.nav-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 14px 0;
  min-height: 64px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--display);
  font-size: 22px; font-weight: 600; letter-spacing: -0.01em;
  flex-shrink: 0;
  line-height: 1;
}
.brand .dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--gold);
  display: inline-block;
}

.nav-links {
  display: flex;
  gap: 28px;
  font-size: 13.5px;
  letter-spacing: 0.01em;
  margin-left: 36px;
  white-space: nowrap;
  align-items: center;
  height: 100%;
}
.nav-links a {
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: border-color .2s, color .2s;
  color: var(--ink-soft);
}
.nav-links a:hover { color: var(--ink); }
.nav-links a[aria-current="page"] { color: var(--ink); border-color: var(--accent); }

/* unified tools cluster (lang + theme + WA) */
.nav-tools {
  margin-left: auto;
  display: inline-flex; align-items: center;
  gap: 10px;
  flex-shrink: 0;
  height: 42px;
}

.lang-switch {
  display: inline-flex;
  align-items: stretch;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  overflow: hidden;
  height: 42px;
  background: var(--paper);
}
.lang-switch button {
  padding: 0;
  width: 50px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  border-right: 1px solid var(--rule);
  display: flex; align-items: center; justify-content: center;
  transition: background .15s, color .15s;
  text-transform: uppercase;
}
.lang-switch button:last-child { border-right: 0; }
.lang-switch button:hover { color: var(--ink); background: var(--paper-2); }
.lang-switch button.active { background: var(--ink); color: var(--paper); }

.theme-toggle {
  width: 42px; height: 42px;
  border: 1px solid var(--rule-strong);
  border-radius: 50%;
  background: var(--paper);
  color: var(--ink);
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: background .2s, color .2s, border-color .2s;
  flex-shrink: 0;
}
.theme-toggle:hover { background: var(--paper-2); }
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

.nav-cta {
  font-size: 11.5px;
  font-family: var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0 22px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  border-radius: 999px;
  transition: background .2s, color .2s, border-color .2s;
  white-space: nowrap;
  height: 42px;
  display: inline-flex; align-items: center;
  font-weight: 500;
}
.nav-cta:hover { background: var(--accent); border-color: var(--accent); color: #fff; }

/* burger button — visible on mobile only */
.nav-burger {
  display: none;
  width: 42px; height: 42px;
  border: 1px solid var(--rule-strong);
  border-radius: 50%;
  background: var(--paper);
  flex-direction: column; gap: 5px;
  align-items: center; justify-content: center;
  cursor: pointer;
  margin-right: -4px;
  transition: background .2s;
}
.nav-burger:hover { background: var(--paper-2); }
.nav-burger span {
  display: block; width: 16px; height: 1.5px;
  background: var(--ink); border-radius: 2px;
  transition: transform .3s, opacity .2s;
  transform-origin: center;
}
.nav-burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* mobile menu drawer */
.mobile-menu {
  position: fixed;
  inset: 64px 0 0 0;
  background: var(--paper);
  border-top: 1px solid var(--rule);
  z-index: 49;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
  transition: opacity .2s, transform .2s;
  overflow-y: auto;
}
.mobile-menu[aria-hidden="false"] {
  opacity: 1;
  pointer-events: auto;
  transform: none;
}
.mobile-menu-inner {
  display: flex; flex-direction: column;
  padding: 32px 24px 48px;
  gap: 4px;
  max-width: 480px; margin: 0 auto;
}
.mobile-menu a {
  font-family: var(--display);
  font-size: 32px;
  letter-spacing: -0.01em;
  color: var(--ink);
  padding: 16px 0;
  border-bottom: 1px solid var(--rule);
}
.mobile-menu a[aria-current="page"] { color: var(--accent); }
.mobile-menu a.mobile-cta {
  font-family: var(--mono);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  padding: 14px 0;
  border-bottom: 1px solid var(--rule);
}
.mobile-menu a.mobile-cta:first-of-type { margin-top: 24px; border-top: 1px solid var(--rule); }
html.menu-open { overflow: hidden; }

/* Global mobile polish: tighten section padding + typography */
@media (max-width: 760px) {
  section { padding: 64px 0; }
  .wrap { padding: 0 20px; }
  .section-label { font-size: 11px; margin-bottom: 24px; }
}
@media (max-width: 480px) {
  section { padding: 56px 0; }
  .wrap { padding: 0 16px; }
  .footer { margin-top: 64px; padding: 56px 0 24px; }
  .btn { padding: 12px 18px; font-size: 13px; }
}

@media (max-width: 1100px) {
  .nav-links { display: none; }
  .nav-burger { display: flex; }
}
@media (min-width: 1101px) {
  .mobile-menu { display: none; }
}
@media (max-width: 640px) {
  .nav-cta { display: none; }
  .nav-inner { gap: 16px; }
}

/* ========================== FOOTER ========================== */
.footer {
  margin-top: 120px;
  padding: 80px 0 32px;
  border-top: 1px solid var(--rule);
  background: var(--paper-2);
  position: relative;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 80px;
}
.footer h4 {
  font-family: var(--mono);
  font-size: 10px; letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
  margin-bottom: 16px;
}
.footer ul { list-style: none; padding: 0; margin: 0; }
.footer li { margin-bottom: 8px; font-size: 14px; color: var(--ink-soft); }
.footer li a:hover { color: var(--accent); }
.footer .wordmark {
  font-family: var(--display);
  font-size: 64px; font-weight: 500;
  letter-spacing: -0.02em; line-height: 1;
  margin-bottom: 12px;
}
.footer .wordmark em { font-style: italic; color: var(--gold); }
.footer-bottom {
  display: flex; justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 10px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--muted);
}
@media (max-width: 860px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer .wordmark { font-size: 48px; }
}

/* ========================== SECTIONS ========================== */
section { padding: 96px 0; }
.section-label {
  display: flex; align-items: center; gap: 16px;
  font-family: var(--mono);
  font-size: 11px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--muted);
  margin-bottom: 32px;
}
.section-label::before {
  content: ""; width: 28px; height: 1px;
  background: var(--ink);
}

/* ========================== BUTTONS ========================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 22px;
  border-radius: 999px;
  font-size: 13px; letter-spacing: 0.02em;
  border: 1px solid var(--ink);
  transition: all .2s;
  cursor: pointer;
}
.btn:hover { background: var(--ink); color: var(--paper); }
.btn.primary { background: var(--ink); color: var(--paper); }
.btn.primary:hover { background: var(--accent); border-color: var(--accent); color: var(--paper); }
.btn .arrow { transition: transform .2s; }
.btn:hover .arrow { transform: translateX(4px); }
[data-lang="ar"] .btn .arrow { transform: scaleX(-1); }
[data-lang="ar"] .btn:hover .arrow { transform: scaleX(-1) translateX(4px); }

/* ========================== PAGE HERO (shared across sub-pages) ========================== */
.page-hero {
  padding: 80px 0 100px;
  border-bottom: 1px solid var(--rule);
  position: relative;
  overflow: hidden;
}
.page-hero .eyebrow {
  display: flex; align-items: center; gap: 16px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 32px;
}
.page-hero .eyebrow b { color: var(--accent); font-weight: 500; }
.page-hero h1 {
  font-family: var(--display);
  font-size: clamp(44px, 8vw, 128px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  font-weight: 500;
  max-width: 18ch;
}
.page-hero h1 em { font-style: italic; color: var(--accent); }
.page-hero .lede {
  margin-top: 32px;
  max-width: 58ch;
  font-family: var(--display);
  font-size: clamp(20px, 2.2vw, 28px);
  line-height: 1.35;
  color: var(--ink-soft);
}

/* ========================== REVEAL ========================== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .9s cubic-bezier(.2,.7,.2,1), transform .9s cubic-bezier(.2,.7,.2,1);
}
.reveal.in { opacity: 1; transform: translateY(0); }

/* CTA split (last-section CTA pattern across pages) */
.cta-split { display: grid; grid-template-columns: 1.4fr 1fr; gap: 48px; align-items: end; }
@media (max-width: 860px) { .cta-split { grid-template-columns: 1fr; gap: 32px; } }