/* বাংলাদেশ পাঠাগার আন্দোলন — রং পরিশিষ্ট-খ অনুযায়ী */
:root {
  --sobuj: #1d5c45;          /* গাঢ় সবুজ */
  --sobuj-dark: #14412f;
  --gerua: #c0651a;          /* গেরুয়া */
  --gerua-dark: #9c4f12;
  --krim: #fbf8f2;           /* ক্রিম */
  --halka-gerua: #f3c79a;    /* হালকা গেরুয়া */

  --ink: #1f2a25;
  --ink-soft: #4a5751;
  --line: #e4ddd0;
  --paper: #ffffff;
  --tint: #f4efe5;

  --font-head: "Noto Serif Bengali", "Kalpurush", serif;
  --font-body: "Hind Siliguri", "Noto Sans Bengali", "SolaimanLipi", sans-serif;

  --radius: 10px;
  --wrap: 1120px;
  --gutter: 16px;
  --shadow: 0 1px 2px rgba(20, 65, 47, .06), 0 6px 18px rgba(20, 65, 47, .07);
}

*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  margin: 0;
  background: var(--krim);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--sobuj); }
a:hover { color: var(--gerua-dark); }

h1, h2, h3 {
  font-family: var(--font-head);
  line-height: 1.4;
  margin: 0 0 .5em;
  color: var(--sobuj-dark);
}

p { margin: 0 0 1em; }

.sr-only {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

:focus-visible { outline: 3px solid var(--gerua); outline-offset: 2px; }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.narrow { max-width: 760px; }

/* ---------- খসড়া ফিতা ---------- */
.draft-bar {
  background: var(--halka-gerua);
  color: var(--sobuj-dark);
  text-align: center;
  font-size: 14px;
  padding: 4px var(--gutter);
}

/* ---------- হেডার ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(251, 248, 242, .94);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 68px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: inherit;
  min-width: 0;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.3; }
.brand-name { font-family: var(--font-head); font-weight: 700; color: var(--sobuj-dark); font-size: 18px; }
.brand-sub { font-size: 13px; color: var(--gerua-dark); }

.site-nav { display: flex; align-items: center; gap: 4px; }
.site-nav a {
  text-decoration: none;
  color: var(--ink);
  padding: 6px 12px;
  border-radius: 6px;
  font-weight: 500;
}
.site-nav a:hover,
.site-nav a.is-current { background: var(--tint); color: var(--sobuj); }
.site-nav a.nav-cta { background: var(--sobuj); color: #fff; margin-left: 6px; }
.site-nav a.nav-cta:hover { background: var(--sobuj-dark); color: #fff; }

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  padding: 10px;
  cursor: pointer;
}
.nav-toggle .bar {
  display: block; width: 24px; height: 2px; margin: 5px 0;
  background: var(--sobuj-dark);
  transition: transform .2s, opacity .2s;
}
.nav-toggle[aria-expanded="true"] .bar:nth-child(2) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .bar:nth-child(3) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .bar:nth-child(4) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- বোতাম ---------- */
.btn {
  display: inline-block;
  font: inherit;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: 999px;
  border: 2px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
}
.btn-primary { background: var(--gerua); color: #fff; }
.btn-primary:hover { background: var(--gerua-dark); color: #fff; }
.btn-ghost { border-color: var(--sobuj); color: var(--sobuj); }
.btn-ghost:hover { background: var(--sobuj); color: #fff; }

/* ---------- প্রথম দর্শন ---------- */
.hero {
  background:
    linear-gradient(90deg, var(--sobuj) 0 8px, transparent 8px),
    var(--krim);
  padding: 72px 0 64px;
  border-bottom: 6px solid var(--gerua);
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  align-items: center;
  gap: 40px;
}
.eyebrow {
  color: var(--gerua-dark);
  font-weight: 600;
  letter-spacing: .02em;
  margin-bottom: .6em;
}
.hero h1 { font-size: clamp(30px, 4.6vw, 50px); font-weight: 800; }
.lead { font-size: 19px; color: var(--ink-soft); max-width: 36em; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.hero-art {
  justify-self: center;
  width: min(320px, 100%);
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--paper);
  box-shadow: var(--shadow);
  display: grid;
  place-items: center;
}
.hero-art img { width: 78%; animation: glow 4s ease-in-out infinite; }
@keyframes glow {
  0%, 100% { filter: drop-shadow(0 0 0 rgba(192, 101, 26, 0)); }
  50% { filter: drop-shadow(0 -6px 14px rgba(192, 101, 26, .35)); }
}

/* ---------- অংশ ---------- */
.section { padding: 72px 0; }
.section-title { font-size: clamp(26px, 3.4vw, 36px); }
.section-title::after {
  content: "";
  display: block;
  width: 56px;
  height: 4px;
  background: var(--gerua);
  border-radius: 2px;
  margin-top: 10px;
}
.section-intro { color: var(--ink-soft); max-width: 46em; margin-bottom: 32px; }
.fineprint { font-size: 15px; color: var(--ink-soft); margin-top: 24px; }

.prostabona { background: var(--paper); }
.pull {
  margin: 28px 0 0;
  padding: 18px 24px;
  border-left: 5px solid var(--gerua);
  background: var(--tint);
  font-family: var(--font-head);
  font-size: 21px;
  font-weight: 700;
  color: var(--sobuj-dark);
  border-radius: 0 var(--radius) var(--radius) 0;
}

/* ---------- গ্রিড ও কার্ড ---------- */
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
}
.card h3 { font-size: 20px; }
.card p { margin: 0; color: var(--ink-soft); }

/* ---------- মূলমন্ত্র ---------- */
.mulmontro { background: var(--sobuj); color: var(--krim); }
.mulmontro .section-title,
.mulmontro h3 { color: #fff; }
.mulmontro .section-intro,
.mulmontro .fineprint { color: rgba(251, 248, 242, .82); }

.motto {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 6px 10px;
  margin: 8px 0 28px;
}
.motto-word {
  font-family: var(--font-head);
  font-size: clamp(30px, 6vw, 56px);
  font-weight: 800;
  background: none;
  border: 0;
  border-bottom: 4px solid transparent;
  color: rgba(251, 248, 242, .55);
  padding: 0 6px 4px;
  cursor: pointer;
  transition: color .2s, border-color .2s;
}
.motto-word:hover { color: var(--krim); }
.motto-word.is-active { color: var(--halka-gerua); border-color: var(--gerua); }
.motto-dash { font-size: clamp(24px, 4vw, 40px); color: var(--halka-gerua); }

.motto-panel {
  max-width: 760px;
  margin: 0 auto;
  background: rgba(255, 255, 255, .08);
  border: 1px solid rgba(243, 199, 154, .35);
  border-radius: var(--radius);
  padding: 22px 26px;
  min-height: 150px;
}
.motto-def { font-size: 19px; }
.motto-def strong { color: var(--halka-gerua); }
.motto-map { margin: 0; font-size: 15px; color: rgba(251, 248, 242, .8); }
.motto-map a {
  display: inline-block;
  color: var(--sobuj-dark);
  background: var(--halka-gerua);
  border-radius: 999px;
  padding: 0 10px;
  margin: 2px 4px 2px 0;
  text-decoration: none;
  font-size: 14px;
}
.motto-map a:hover { background: #fff; }

/* ---------- ঐতিহাসিক অঙ্গীকার ---------- */
.ongikar .card { border-top: 4px solid var(--sobuj); }

/* ---------- মূলনীতি ---------- */
.mulniti { background: var(--paper); }
.niti-list { display: grid; gap: 12px; }
.niti {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--krim);
  transition: box-shadow .2s, border-color .2s;
}
.niti[open] { background: var(--paper); box-shadow: var(--shadow); }
.niti.is-flash { border-color: var(--gerua); box-shadow: 0 0 0 3px rgba(192, 101, 26, .25); }
.niti summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 18px;
  cursor: pointer;
}
.niti summary::-webkit-details-marker { display: none; }
.niti summary::after {
  content: "+";
  margin-left: auto;
  font-size: 24px;
  color: var(--gerua);
  transition: transform .2s;
}
.niti[open] summary::after { transform: rotate(45deg); }
.niti-num {
  flex: none;
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--sobuj);
  color: #fff;
  font-family: var(--font-head);
  font-weight: 700;
}
.niti-title { font-family: var(--font-head); font-weight: 700; font-size: 19px; color: var(--sobuj-dark); }
.niti-body { padding: 0 18px 18px 74px; color: var(--ink-soft); }
.niti-decl { color: var(--ink); }

/* ---------- সীমারেখা ---------- */
.limit {
  background: var(--paper);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--line);
  border-left: 6px solid var(--gerua);
}
.limit-tag {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--gerua-dark);
}
.limit h3 { font-size: 22px; }
.limit p:last-child { margin: 0; color: var(--ink-soft); }

/* ---------- কর্মসূচি ---------- */
.korsuchi { background: var(--tint); }
.prog { position: relative; padding-top: 28px; }
.prog-letter {
  position: absolute;
  top: -16px; left: 22px;
  width: 36px; height: 36px;
  display: grid; place-items: center;
  border-radius: 8px;
  background: var(--gerua);
  color: #fff;
  font-family: var(--font-head);
  font-weight: 700;
}
.korsuchi .grid { row-gap: 36px; padding-top: 16px; }

/* ---------- যুক্ত হোন ---------- */
.join-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}
.member-types { padding-left: 1.1em; margin: 0; }
.member-types li { margin-bottom: 8px; }

.join-form {
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 5px solid var(--sobuj);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}
.form-note { font-size: 14px; color: var(--ink-soft); }
.join-form > label { display: block; font-weight: 600; margin: 14px 0 4px; }
.join-form input[type="text"] {
  width: 100%;
  font: inherit;
  padding: 9px 12px;
  border: 1px solid #cfc6b6;
  border-radius: 6px;
  background: var(--krim);
}
.join-form input:focus { outline: 2px solid var(--sobuj); border-color: var(--sobuj); }
.join-form input.is-invalid { border-color: #b3261e; background: #fdf0ef; }
.interests { border: 0; padding: 0; margin: 18px 0 0; }
.interests legend { font-weight: 600; padding: 0; margin-bottom: 4px; }
.interests label,
.guardian label { display: flex; gap: 8px; align-items: center; margin: 2px 0; }
.interests input,
.guardian input { accent-color: var(--sobuj); width: 18px; height: 18px; }
.guardian {
  margin-top: 14px;
  padding: 10px 12px;
  background: var(--tint);
  border-radius: 6px;
}
.form-msg { min-height: 1.8em; margin: 14px 0 10px; font-weight: 500; }
.form-msg.is-error { color: #b3261e; }
.form-msg.is-ok { color: var(--sobuj); }

/* ---------- দলিলপত্র ---------- */
.dolil { background: var(--paper); }
.doc {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--krim);
  text-decoration: none;
  color: var(--ink);
  transition: transform .15s, box-shadow .15s, border-color .15s;
}
.doc:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--gerua); color: var(--ink); }
.doc-kind { font-size: 14px; color: var(--gerua-dark); font-weight: 600; }
.doc-name { font-family: var(--font-head); font-size: 24px; font-weight: 700; color: var(--sobuj-dark); }
.doc-meta { font-size: 14px; color: var(--ink-soft); }

/* ---------- ফুটার ---------- */
.site-footer {
  background: var(--sobuj-dark);
  color: rgba(251, 248, 242, .85);
  padding: 44px 0 36px;
  border-top: 6px solid var(--gerua);
}
.footer-inner { display: grid; gap: 18px; }
.footer-brand { display: flex; align-items: center; gap: 16px; }
.footer-brand img { border: 1px solid rgba(255, 255, 255, .2); }
.footer-name { font-family: var(--font-head); font-weight: 700; color: #fff; font-size: 20px; margin: 0; }
.footer-slogan { margin: 0; color: var(--halka-gerua); }
.footer-note { font-size: 15px; max-width: 52em; margin: 0; }
.to-top { color: var(--halka-gerua); justify-self: start; }
.to-top:hover { color: #fff; }

/* ---------- ধীরে ফুটে ওঠা ---------- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .5s ease, transform .5s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-art img { animation: none; }
}

/* ---------- ছোট পর্দা ---------- */
@media (max-width: 960px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 820px) {
  .nav-toggle { display: block; }
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--krim);
    border-bottom: 1px solid var(--line);
    padding: 8px var(--gutter) 16px;
    display: none;
  }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 10px 12px; }
  .site-nav a.nav-cta { margin: 8px 0 0; text-align: center; }

  .hero { padding: 48px 0; }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-art { order: -1; width: 160px; }
  .join-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  body { font-size: 16px; }
  .section { padding: 52px 0; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .brand-name { font-size: 16px; }
  .brand img { width: 36px; height: 36px; }
  .niti-body { padding-left: 18px; }
  .niti summary { gap: 12px; }
  .niti-title { font-size: 17px; }
  .motto-panel { padding: 18px; }
}