/* ============================================================
   ডেমো উন্নয়ন সংস্থা — NGO demo (premium multi-page)
   Green + amber + cream (HDO-style light theme)
   ============================================================ */

:root {
  --green-950: #072a1e;
  --green-900: #0a3a2a;
  --green-800: #0f5138;
  --green-700: #166534;
  --green-600: #15803d;
  --amber-600: #b45309;
  --amber-500: #d99a2b;
  --amber-100: #f5e7c8;
  --cream: #f6f1e6;
  --cream-2: #efe7d5;
  --ink: #12332f;
  --text: #3f5551;
  --muted: #64748b;
  --border: #e3dcc9;
  --white: #ffffff;
  --radius: 14px;
  --shadow: 0 12px 34px rgba(7, 42, 30, 0.10);
  --shadow-sm: 0 4px 14px rgba(7, 42, 30, 0.06);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Hind Siliguri", "Poppins", system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--cream);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; }
::selection { background: var(--amber-100); color: var(--green-950); }

.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
section { padding: 80px 0; scroll-margin-top: 74px; }
.section-head { text-align: center; max-width: 660px; margin: 0 auto 48px; }
.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--green-700);
  margin-bottom: 10px;
}
.section-head h2 { font-size: clamp(1.6rem, 3.2vw, 2.2rem); font-weight: 800; color: var(--green-950); margin-bottom: 12px; }
.section-head p { color: var(--muted); font-size: 15.5px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 800;
  font-size: 15px;
  border-radius: 11px;
  padding: 13px 26px;
  border: 1.5px solid transparent;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
  white-space: nowrap;
}
.btn-primary { background: var(--green-800); color: #fff; box-shadow: 0 10px 24px rgba(15, 81, 56, 0.3); }
.btn-primary:hover { transform: translateY(-2px); }
.btn-amber { background: var(--amber-500); color: var(--green-950); box-shadow: 0 10px 24px rgba(217, 154, 43, 0.3); }
.btn-amber:hover { transform: translateY(-2px); }
.btn-ghost { background: transparent; border-color: var(--border); color: var(--green-800); }
.btn-ghost:hover { border-color: var(--amber-500); }
.btn-sm { padding: 9px 17px; font-size: 13.5px; }

/* ---------- header ---------- */
#site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: rgba(246, 241, 230, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
#site-header.scrolled { border-bottom-color: var(--border); box-shadow: var(--shadow-sm); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 18px; color: var(--green-900); }
.brand-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px; height: 38px;
  border-radius: 11px;
  background: var(--green-800);
  font-size: 17px;
}
.brand span { color: var(--amber-600); }
#nav-menu { display: flex; gap: 24px; }
#nav-menu a { font-size: 14.5px; font-weight: 700; color: var(--text); padding: 6px 0; transition: color 0.15s ease; }
#nav-menu a:hover { color: var(--green-700); }
#nav-menu a.active { color: var(--amber-600); }
.header-actions { display: flex; align-items: center; gap: 12px; }
.lang-btn {
  font-family: inherit;
  font-size: 13px;
  font-weight: 800;
  color: var(--green-800);
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 999px;
  padding: 7px 14px;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.lang-btn:hover { border-color: var(--amber-500); }
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px; height: 42px;
  padding: 10px;
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 10px;
}
.nav-toggle span { display: block; height: 2px; width: 100%; background: var(--green-900); border-radius: 2px; transition: transform 0.22s ease, opacity 0.22s ease; }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- hero (index) ---------- */
.hero {
  position: relative;
  padding: 160px 0 96px;
  text-align: center;
  background:
    radial-gradient(560px 340px at 85% 8%, rgba(217, 154, 43, 0.18), transparent 70%),
    radial-gradient(520px 320px at 8% 92%, rgba(21, 128, 61, 0.12), transparent 70%),
    var(--cream);
}
.hero-badge {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--amber-600);
  background: var(--amber-100);
  border-radius: 999px;
  padding: 6px 16px;
  margin-bottom: 18px;
}
.hero h1 { font-size: clamp(2rem, 4.5vw, 2.9rem); font-weight: 800; color: var(--green-950); line-height: 1.25; margin-bottom: 14px; }
.hero p { max-width: 600px; margin: 0 auto 30px; color: var(--text); font-size: 16.5px; }
.hero-actions { display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }
.hero-photo {
  max-width: 900px;
  margin: 46px auto 0;
  border-radius: 22px;
  overflow: hidden;
  border: 6px solid #fff;
  box-shadow: var(--shadow);
}
.hero-photo img { width: 100%; height: auto; aspect-ratio: 21/9; object-fit: cover; }

/* ---------- vision band ---------- */
.vision { background: var(--green-950); color: var(--cream); }
.vision-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 36px; text-align: center; padding: 16px 0; }
.vision-item h3 { font-size: 17px; font-weight: 800; color: var(--amber-500); margin-bottom: 8px; }
.vision-item p { font-size: 14px; color: rgba(246, 241, 230, 0.85); }
@media (max-width: 820px) { .vision-grid { grid-template-columns: 1fr; gap: 24px; padding: 28px 0; } }

/* ---------- stats ---------- */
.stats { background: linear-gradient(120deg, var(--green-900), var(--green-700)); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; padding: 44px 0; }
.stat b { display: block; font-size: clamp(1.8rem, 3.2vw, 2.4rem); font-weight: 800; color: var(--amber-500); }
.stat span { font-size: 13.5px; color: rgba(255, 255, 255, 0.85); }
@media (max-width: 700px) { .stats-grid { grid-template-columns: repeat(2, 1fr); row-gap: 26px; } }

/* ---------- cards ---------- */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 24px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px; height: 52px;
  border-radius: 14px;
  background: var(--amber-100);
  font-size: 24px;
  margin-bottom: 16px;
}
.card h3 { font-size: 17.5px; font-weight: 800; color: var(--green-900); margin-bottom: 8px; }
.card p { font-size: 14px; color: var(--muted); }
.card a.more { display: inline-block; margin-top: 14px; font-size: 13.5px; font-weight: 800; color: var(--amber-600); }
.card a.more:hover { text-decoration: underline; }

/* ---------- photo cards ---------- */
.photo-card { overflow: hidden; padding: 0; display: flex; flex-direction: column; }
.photo-card .ph { height: 190px; overflow: hidden; }
.photo-card .ph img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.35s ease; }
.photo-card:hover .ph img { transform: scale(1.05); }
.photo-card .body { padding: 22px; flex: 1; }
.photo-card h3 { font-size: 16.5px; font-weight: 800; color: var(--green-900); margin-bottom: 6px; }
.photo-card p { font-size: 13.5px; color: var(--muted); }

/* ---------- tabs ---------- */
.tabs { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; margin-bottom: 40px; }
.tab-btn {
  font-size: 14px;
  font-weight: 800;
  color: var(--text);
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 999px;
  padding: 9px 20px;
  transition: all 0.18s ease;
}
.tab-btn:hover { color: var(--green-800); border-color: var(--amber-500); }
.tab-btn.active { color: #fff; background: var(--green-800); border-color: var(--green-800); }
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadein 0.35s ease; }
@keyframes fadein { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* ---------- news list ---------- */
.news-list { max-width: 720px; margin: 0 auto; }
.news-item { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 14px; overflow: hidden; box-shadow: var(--shadow-sm); }
.news-item summary {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
  cursor: pointer;
  list-style: none;
}
.news-item summary::-webkit-details-marker { display: none; }
.news-item summary::after { content: "+"; flex-shrink: 0; margin-left: auto; width: 26px; height: 26px; border-radius: 50%; background: var(--cream-2); color: var(--green-800); font-weight: 800; font-size: 18px; display: flex; align-items: center; justify-content: center; transition: transform 0.2s ease; }
.news-item[open] summary::after { content: "−"; transform: rotate(180deg); }
.news-date { flex-shrink: 0; width: 60px; text-align: center; background: var(--cream-2); border-radius: 10px; padding: 7px 5px; }
.news-date b { display: block; font-size: 18px; font-weight: 800; color: var(--green-800); line-height: 1.1; }
.news-date span { font-size: 11px; font-weight: 700; color: var(--muted); }
.news-item summary h3 { font-size: 15.5px; font-weight: 700; color: var(--ink); }
.news-item .news-body { padding: 0 22px 20px 98px; font-size: 14px; color: var(--text); }
.news-item .news-body img { border-radius: 12px; margin-bottom: 12px; aspect-ratio: 16/7; object-fit: cover; width: 100%; }
@media (max-width: 640px) { .news-item .news-body { padding-left: 22px; } }

/* ---------- gallery ---------- */
.gallery-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.gallery-grid figure { border-radius: var(--radius); overflow: hidden; border: 4px solid #fff; box-shadow: var(--shadow-sm); position: relative; }
.gallery-grid img { width: 100%; aspect-ratio: 4/3; object-fit: cover; transition: transform 0.35s ease; }
.gallery-grid figure:hover img { transform: scale(1.06); }
.gallery-grid figcaption { position: absolute; left: 0; right: 0; bottom: 0; background: linear-gradient(transparent, rgba(7, 42, 30, 0.82)); color: #fff; font-size: 13px; font-weight: 700; padding: 26px 14px 10px; }
@media (max-width: 860px) { .gallery-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .gallery-grid { grid-template-columns: 1fr; } }

/* ---------- donate ---------- */
.donate-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 44px; align-items: start; }
.donate-amounts { display: flex; gap: 12px; flex-wrap: wrap; margin: 18px 0; }
.amount-btn {
  font-size: 15px;
  font-weight: 800;
  color: var(--green-800);
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 11px;
  padding: 12px 20px;
  transition: all 0.15s ease;
}
.amount-btn:hover { border-color: var(--amber-500); }
.amount-btn.selected { background: var(--amber-500); color: var(--green-950); border-color: var(--amber-500); }
.form-card { background: var(--white); border: 1px solid var(--border); border-radius: 18px; padding: 32px 28px; box-shadow: var(--shadow-sm); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.form-field label { display: block; font-size: 13.5px; font-weight: 700; color: var(--ink); margin-bottom: 7px; }
.form-field input, .form-field select, .form-field textarea {
  width: 100%;
  font-family: inherit;
  font-size: 14.5px;
  color: var(--ink);
  background: var(--cream);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  transition: border-color 0.15s ease;
}
.form-field input:focus, .form-field select:focus, .form-field textarea:focus { outline: none; border-color: var(--green-700); }
.form-field textarea { resize: vertical; min-height: 90px; }
.form-field .err { display: none; font-size: 12px; color: #dc2626; margin-top: 5px; }
.form-field.invalid input, .form-field.invalid textarea { border-color: #dc2626; }
.form-field.invalid .err { display: block; }
.form-success { display: none; text-align: center; padding: 34px 10px; }
.form-success.show { display: block; animation: fadein 0.4s ease; }
.form-success .ok {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 68px; height: 68px;
  border-radius: 50%;
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  font-size: 30px;
  margin-bottom: 16px;
}
.form-success h3 { font-size: 19px; font-weight: 800; color: var(--green-950); margin-bottom: 8px; }
.form-success p { font-size: 14px; color: var(--muted); }
@media (max-width: 900px) { .donate-grid { grid-template-columns: 1fr; } .form-row { grid-template-columns: 1fr; } }

/* ---------- cta band ---------- */
.cta-band { background: var(--green-950); text-align: center; padding: 60px 0; }
.cta-band h2 { color: var(--cream); font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 800; margin-bottom: 10px; }
.cta-band p { color: rgba(246, 241, 230, 0.8); max-width: 520px; margin: 0 auto 26px; font-size: 15px; }

/* ---------- page hero (inner pages) ---------- */
.page-hero {
  padding: 150px 0 64px;
  text-align: center;
  background:
    radial-gradient(520px 280px at 50% 0%, rgba(217, 154, 43, 0.16), transparent 70%),
    var(--cream);
}
.page-hero h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 800; color: var(--green-950); margin-bottom: 12px; }
.page-hero p { max-width: 560px; margin: 0 auto; color: var(--muted); font-size: 15.5px; }

/* ---------- footer ---------- */
footer { background: var(--green-950); color: rgba(246, 241, 230, 0.75); }
.footer-grid { display: grid; grid-template-columns: 1.5fr 0.9fr 0.9fr 1fr; gap: 40px; padding: 56px 20px 36px; }
.footer-brand p { font-size: 13.5px; margin-top: 12px; max-width: 280px; }
.footer-col h3 { font-size: 14.5px; font-weight: 800; color: var(--cream); margin-bottom: 16px; }
.footer-col a { display: block; font-size: 13.5px; margin-bottom: 10px; transition: color 0.15s ease; }
.footer-col a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, 0.1); text-align: center; padding: 18px 20px; font-size: 12.5px; color: rgba(246, 241, 230, 0.55); }
.demo-note { margin-top: 4px; }
.demo-note a { color: var(--amber-500); font-weight: 700; }
@media (max-width: 860px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .footer-grid { grid-template-columns: 1fr; } }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .nav-toggle { display: flex; }
  #nav-menu {
    position: absolute;
    top: 68px; left: 0; right: 0;
    flex-direction: column;
    gap: 4px;
    background: var(--cream);
    border-bottom: 1px solid var(--border);
    padding: 14px 24px 20px;
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
  }
  #nav-menu.open { opacity: 1; transform: translateY(0); pointer-events: auto; }
  #nav-menu a { padding: 10px 4px; font-size: 15.5px; border-bottom: 1px solid var(--border); }
  #nav-menu a:last-child { border-bottom: none; }
  .hero { padding: 136px 0 80px; }
  .card-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 620px) {
  section { padding: 62px 0; }
  .card-grid { grid-template-columns: 1fr; }
  .hero-actions .btn { flex: 1 1 100%; }
}