/* Bangladesh Postal Code Finder — kawshik.dev
   Plain CSS, no framework or external dependency. */
:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-2: #f0f4f8;
  --surface-3: #e8eef5;
  --text: #10213b;
  --muted: #607089;
  --border: #dce4ee;
  --primary: #0a7d62;
  --primary-strong: #05634d;
  --primary-soft: #e7f7f1;
  --accent: #d9263e;
  --accent-soft: #fff0f2;
  --focus: #1d8cf8;
  --success: #087f5b;
  --warning: #a35c00;
  --shadow-sm: 0 8px 28px rgba(16, 33, 59, 0.08);
  --shadow-lg: 0 24px 70px rgba(16, 33, 59, 0.14);
  --radius-sm: 12px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --container: 1180px;
}

[data-theme="dark"] {
  --bg: #08111f;
  --surface: #101c2e;
  --surface-2: #15243a;
  --surface-3: #1c2d46;
  --text: #f2f6fb;
  --muted: #a9b8cb;
  --border: #263a56;
  --primary: #36c99b;
  --primary-strong: #60dfb7;
  --primary-soft: rgba(54, 201, 155, 0.12);
  --accent: #ff6175;
  --accent-soft: rgba(255, 97, 117, 0.12);
  --focus: #63a9ff;
  --success: #56d8ae;
  --warning: #ffc36a;
  --shadow-sm: 0 12px 32px rgba(0, 0, 0, 0.22);
  --shadow-lg: 0 28px 80px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; color-scheme: light; }
html[data-theme="dark"] { color-scheme: dark; }
body {
  margin: 0;
  background:
    radial-gradient(circle at 12% -4%, rgba(10, 125, 98, 0.12), transparent 34%),
    radial-gradient(circle at 92% 2%, rgba(217, 38, 62, 0.08), transparent 30%),
    var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans Bengali", Arial, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
}
button, input, select { font: inherit; }
a { color: inherit; }
img, svg { display: block; max-width: 100%; }
button { cursor: pointer; }
:focus-visible { outline: 3px solid color-mix(in srgb, var(--focus) 55%, transparent); outline-offset: 3px; }
::selection { background: var(--primary); color: #fff; }

.container { width: min(var(--container), calc(100% - 32px)); margin-inline: auto; }
.skip-link { position: fixed; left: 12px; top: -80px; z-index: 999; padding: 12px 16px; border-radius: 10px; background: var(--text); color: var(--surface); }
.skip-link:focus { top: 12px; }

.site-header { position: sticky; top: 0; z-index: 50; border-bottom: 1px solid color-mix(in srgb, var(--border) 75%, transparent); background: color-mix(in srgb, var(--bg) 86%, transparent); backdrop-filter: blur(18px); }
.header-inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; font-weight: 850; letter-spacing: -0.03em; }
.brand-mark { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 12px; color: #fff; background: linear-gradient(135deg, var(--primary), #0ca678 68%, var(--accent)); box-shadow: 0 10px 22px rgba(10, 125, 98, .2); }
.brand small { display: block; color: var(--muted); font-size: .72rem; letter-spacing: .02em; font-weight: 650; }
.header-actions { display: flex; align-items: center; gap: 10px; }
.icon-button { min-width: 44px; min-height: 44px; display: inline-grid; place-items: center; border: 1px solid var(--border); border-radius: 13px; color: var(--text); background: var(--surface); box-shadow: var(--shadow-sm); }
.icon-button:hover { transform: translateY(-1px); border-color: var(--primary); }
.home-link { display: none; text-decoration: none; padding: 10px 14px; border-radius: 12px; color: var(--muted); font-weight: 750; }
.home-link:hover { color: var(--primary); background: var(--primary-soft); }

.hero { padding: 72px 0 34px; }
.hero-grid { display: grid; gap: 34px; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; padding: 7px 11px; border: 1px solid color-mix(in srgb, var(--primary) 35%, var(--border)); border-radius: 999px; background: var(--primary-soft); color: var(--primary-strong); font-size: .78rem; font-weight: 850; letter-spacing: .04em; text-transform: uppercase; }
.eyebrow-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 5px var(--accent-soft); }
.hero h1 { max-width: 820px; margin: 18px 0 14px; font-size: clamp(2.25rem, 8vw, 4.8rem); line-height: 1.02; letter-spacing: -0.065em; }
.gradient-text { background: linear-gradient(105deg, var(--primary-strong), var(--primary), var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-copy { max-width: 750px; margin: 0; color: var(--muted); font-size: clamp(1rem, 2.4vw, 1.18rem); }
.hero-trust { margin-top: 20px; display: flex; flex-wrap: wrap; gap: 10px; }
.mini-badge { display: inline-flex; align-items: center; gap: 7px; padding: 8px 11px; border-radius: 999px; background: var(--surface); border: 1px solid var(--border); color: var(--muted); font-size: .82rem; font-weight: 700; }
.flag-orb { min-height: 220px; position: relative; display: grid; place-items: center; overflow: hidden; border: 1px solid var(--border); border-radius: var(--radius-lg); background: linear-gradient(145deg, color-mix(in srgb, var(--surface) 88%, var(--primary-soft)), var(--surface)); box-shadow: var(--shadow-lg); }
.flag-orb::before { content: ""; width: 180px; aspect-ratio: 1; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 84px var(--primary); transform: rotate(-8deg); opacity: .96; }
.flag-orb::after { content: "BD"; position: absolute; right: 22px; bottom: 12px; font-size: 4.2rem; font-weight: 950; letter-spacing: -.08em; color: color-mix(in srgb, var(--text) 12%, transparent); }
.orb-label { position: absolute; left: 22px; top: 20px; padding: 9px 12px; border: 1px solid color-mix(in srgb, white 40%, transparent); border-radius: 999px; background: color-mix(in srgb, var(--surface) 82%, transparent); backdrop-filter: blur(12px); font-size: .82rem; font-weight: 850; }

.finder-shell { padding: 14px 0 64px; }
.finder-card { overflow: hidden; border: 1px solid var(--border); border-radius: var(--radius-lg); background: color-mix(in srgb, var(--surface) 96%, transparent); box-shadow: var(--shadow-lg); }
.finder-top { padding: 22px; border-bottom: 1px solid var(--border); background: linear-gradient(135deg, var(--surface), var(--primary-soft)); }
.search-wrap { display: grid; grid-template-columns: 1fr; gap: 12px; }
.search-control { position: relative; }
.search-icon { position: absolute; left: 16px; top: 50%; transform: translateY(-50%); color: var(--muted); pointer-events: none; }
.search-input { width: 100%; min-height: 58px; padding: 12px 52px 12px 50px; border: 1px solid var(--border); border-radius: 16px; background: var(--surface); color: var(--text); box-shadow: 0 10px 28px rgba(16, 33, 59, .06); font-size: 1rem; }
.search-input::placeholder { color: color-mix(in srgb, var(--muted) 72%, transparent); }
.search-input:focus { border-color: var(--primary); box-shadow: 0 0 0 4px var(--primary-soft); outline: none; }
.clear-search { position: absolute; right: 10px; top: 50%; transform: translateY(-50%); width: 38px; height: 38px; display: none; place-items: center; border: 0; border-radius: 10px; background: var(--surface-2); color: var(--muted); }
.clear-search.is-visible { display: grid; }
.primary-button, .secondary-button, .ghost-button { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; border-radius: 14px; padding: 11px 16px; font-weight: 850; text-decoration: none; transition: .18s ease; }
.primary-button { border: 1px solid var(--primary); background: var(--primary); color: #fff; box-shadow: 0 12px 24px rgba(10, 125, 98, .18); }
.primary-button:hover { background: var(--primary-strong); transform: translateY(-1px); }
.secondary-button { border: 1px solid var(--border); background: var(--surface); color: var(--text); }
.secondary-button:hover { border-color: var(--primary); color: var(--primary-strong); }
.ghost-button { border: 0; background: transparent; color: var(--muted); }
.ghost-button:hover { background: var(--surface-2); color: var(--text); }
.search-help { margin: 11px 0 0; color: var(--muted); font-size: .84rem; }
.search-help kbd { padding: 2px 6px; border: 1px solid var(--border); border-bottom-width: 2px; border-radius: 6px; background: var(--surface); color: var(--text); }

.recent-row { margin-top: 16px; display: none; align-items: center; gap: 10px; flex-wrap: wrap; }
.recent-row.is-visible { display: flex; }
.recent-label { color: var(--muted); font-size: .82rem; font-weight: 750; }
.recent-chip { border: 1px solid var(--border); border-radius: 999px; padding: 7px 11px; background: var(--surface); color: var(--muted); font-size: .82rem; font-weight: 750; }
.recent-chip:hover { border-color: var(--primary); color: var(--primary); }

.filter-panel { padding: 20px 22px; border-bottom: 1px solid var(--border); }
.filter-heading { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-bottom: 14px; }
.filter-heading h2 { margin: 0; font-size: 1rem; }
.filter-grid { display: grid; gap: 12px; }
.field label { display: block; margin-bottom: 7px; color: var(--muted); font-size: .78rem; font-weight: 800; }
.field select { width: 100%; min-height: 48px; border: 1px solid var(--border); border-radius: 13px; padding: 10px 38px 10px 12px; background: var(--surface); color: var(--text); }
.field select:disabled { opacity: .56; cursor: not-allowed; }
.filter-tools { margin-top: 14px; display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.segmented { display: inline-flex; padding: 4px; border: 1px solid var(--border); border-radius: 13px; background: var(--surface-2); }
.segmented button { min-height: 38px; border: 0; border-radius: 9px; padding: 7px 12px; background: transparent; color: var(--muted); font-size: .82rem; font-weight: 850; }
.segmented button[aria-pressed="true"] { background: var(--surface); color: var(--primary-strong); box-shadow: var(--shadow-sm); }

.results-area { padding: 22px; }
.results-toolbar { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; margin-bottom: 18px; }
.results-toolbar h2 { margin: 0; font-size: clamp(1.15rem, 3vw, 1.55rem); letter-spacing: -.025em; }
.results-summary { margin: 3px 0 0; color: var(--muted); font-size: .88rem; }
.results-actions { display: flex; gap: 8px; flex-shrink: 0; }
.status-message { display: none; margin-bottom: 14px; padding: 11px 13px; border-radius: 12px; background: var(--primary-soft); color: var(--primary-strong); font-size: .87rem; font-weight: 750; }
.status-message.is-visible { display: block; }
.loader { display: grid; gap: 10px; }
.skeleton { height: 112px; border-radius: 16px; background: linear-gradient(90deg, var(--surface-2) 20%, var(--surface-3) 42%, var(--surface-2) 64%); background-size: 300% 100%; animation: shimmer 1.2s infinite; }
@keyframes shimmer { to { background-position: -100% 0; } }
.result-grid { display: grid; gap: 14px; }
.result-card { position: relative; overflow: hidden; border: 1px solid var(--border); border-radius: 17px; padding: 17px; background: var(--surface); transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease; }
.result-card:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--primary) 50%, var(--border)); box-shadow: var(--shadow-sm); }
.result-card::before { content: ""; position: absolute; inset: 0 auto 0 0; width: 4px; background: linear-gradient(var(--primary), var(--accent)); }
.result-card-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 14px; }
.post-office-name { margin: 0; font-size: 1.04rem; line-height: 1.32; letter-spacing: -.015em; }
.post-office-bn { display: block; margin-top: 4px; color: var(--muted); font-size: .9rem; font-weight: 650; }
.postal-code-box { flex-shrink: 0; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 4px; padding: 5px; border: 1px solid color-mix(in srgb, var(--primary) 32%, var(--border)); border-radius: 13px; background: var(--primary-soft); }
.postal-code { padding: 3px 7px; color: var(--primary-strong); font-size: 1.18rem; font-weight: 950; letter-spacing: .055em; }
.copy-button { min-width: 38px; min-height: 38px; display: grid; place-items: center; border: 0; border-radius: 9px; background: var(--surface); color: var(--muted); }
.copy-button:hover, .copy-button.copied { color: var(--success); }
.result-meta { margin-top: 14px; display: grid; gap: 9px; }
.meta-row { display: flex; align-items: flex-start; gap: 9px; color: var(--muted); font-size: .86rem; }
.meta-row strong { color: var(--text); font-weight: 800; }
.result-links { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 8px; }
.text-link { display: inline-flex; align-items: center; gap: 5px; color: var(--primary-strong); text-decoration: none; font-size: .84rem; font-weight: 850; }
.text-link:hover { text-decoration: underline; }
.office-badge { display: inline-flex; align-items: center; padding: 5px 8px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font-size: .7rem; font-weight: 900; text-transform: uppercase; letter-spacing: .04em; }

.empty-state, .error-state { padding: 42px 18px; text-align: center; border: 1px dashed var(--border); border-radius: 17px; background: var(--surface-2); }
.empty-icon { width: 58px; height: 58px; margin: 0 auto 13px; display: grid; place-items: center; border-radius: 18px; background: var(--surface); color: var(--primary); font-size: 1.5rem; box-shadow: var(--shadow-sm); }
.empty-state h3, .error-state h3 { margin: 0 0 6px; }
.empty-state p, .error-state p { margin: 0 auto; max-width: 560px; color: var(--muted); }
.load-more-wrap { display: flex; justify-content: center; margin-top: 18px; }

.nearby-section { display: none; margin-top: 26px; padding-top: 24px; border-top: 1px solid var(--border); }
.nearby-section.is-visible { display: block; }
.nearby-section h3 { margin: 0 0 4px; }
.nearby-section > p { margin: 0 0 13px; color: var(--muted); font-size: .88rem; }
.nearby-grid { display: grid; gap: 10px; }
.nearby-item { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 13px; border: 1px solid var(--border); border-radius: 14px; background: var(--surface); }
.nearby-item strong { display: block; font-size: .9rem; }
.nearby-item span { color: var(--muted); font-size: .79rem; }
.nearby-code { color: var(--primary-strong) !important; font-size: 1rem !important; font-weight: 950; }

.info-section { padding: 22px 0 72px; }
.section-heading { max-width: 720px; margin-bottom: 22px; }
.section-heading h2 { margin: 0 0 8px; font-size: clamp(1.7rem, 5vw, 2.6rem); line-height: 1.1; letter-spacing: -.045em; }
.section-heading p { margin: 0; color: var(--muted); }
.info-grid { display: grid; gap: 16px; }
.info-card { border: 1px solid var(--border); border-radius: var(--radius-md); padding: 20px; background: var(--surface); box-shadow: var(--shadow-sm); }
.info-card-icon { width: 42px; height: 42px; display: grid; place-items: center; margin-bottom: 14px; border-radius: 13px; background: var(--primary-soft); color: var(--primary-strong); }
.info-card h3 { margin: 0 0 6px; }
.info-card p { margin: 0; color: var(--muted); font-size: .91rem; }

.address-card { overflow: hidden; display: grid; border: 1px solid var(--border); border-radius: var(--radius-lg); background: var(--surface); box-shadow: var(--shadow-lg); }
.address-copy { padding: 24px; }
.address-copy h2 { margin: 0 0 9px; font-size: clamp(1.55rem, 4vw, 2.2rem); letter-spacing: -.04em; }
.address-copy p { color: var(--muted); }
.address-example { padding: 24px; background: linear-gradient(145deg, #0a7d62, #075844); color: #fff; }
.address-example small { color: rgba(255,255,255,.72); font-weight: 800; text-transform: uppercase; letter-spacing: .08em; }
.envelope { margin-top: 13px; padding: 18px; border: 1px solid rgba(255,255,255,.24); border-radius: 15px; background: rgba(255,255,255,.1); box-shadow: inset 0 1px 0 rgba(255,255,255,.12); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; white-space: pre-line; }

.trust-bar { margin-top: 24px; display: flex; align-items: flex-start; gap: 12px; padding: 16px; border: 1px solid var(--border); border-radius: 16px; background: var(--surface); }
.trust-icon { width: 42px; height: 42px; flex: 0 0 auto; display: grid; place-items: center; border-radius: 50%; background: var(--primary-soft); color: var(--primary-strong); }
.trust-bar strong { display: block; }
.trust-bar p { margin: 3px 0 0; color: var(--muted); font-size: .85rem; }

.site-footer { border-top: 1px solid var(--border); padding: 30px 0; background: color-mix(in srgb, var(--surface) 72%, transparent); }
.footer-inner { display: flex; flex-direction: column; gap: 12px; }
.footer-inner p { margin: 0; color: var(--muted); font-size: .86rem; }
.footer-links { display: flex; gap: 15px; flex-wrap: wrap; }
.footer-links a { color: var(--muted); text-decoration: none; font-size: .86rem; font-weight: 750; }
.footer-links a:hover { color: var(--primary); }

.toast { position: fixed; left: 50%; bottom: 24px; z-index: 100; transform: translate(-50%, 28px); display: flex; align-items: center; gap: 8px; max-width: calc(100% - 32px); padding: 11px 15px; border-radius: 13px; background: var(--text); color: var(--surface); box-shadow: var(--shadow-lg); opacity: 0; visibility: hidden; transition: .22s ease; font-weight: 800; font-size: .87rem; }
.toast.is-visible { opacity: 1; visibility: visible; transform: translate(-50%, 0); }

/* SEO listing pages */
.breadcrumbs { padding: 22px 0 0; color: var(--muted); font-size: .83rem; }
.breadcrumbs ol { display: flex; gap: 7px; flex-wrap: wrap; list-style: none; padding: 0; margin: 0; }
.breadcrumbs a { color: var(--primary-strong); text-decoration: none; }
.seo-hero { padding: 38px 0 24px; }
.seo-hero h1 { max-width: 900px; margin: 13px 0 10px; font-size: clamp(2rem, 7vw, 4rem); line-height: 1.03; letter-spacing: -.055em; }
.seo-hero p { max-width: 780px; margin: 0; color: var(--muted); font-size: 1.02rem; }
.stats-row { margin-top: 22px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.stat-card { padding: 15px; border: 1px solid var(--border); border-radius: 16px; background: var(--surface); }
.stat-card strong { display: block; font-size: 1.35rem; color: var(--primary-strong); }
.stat-card span { color: var(--muted); font-size: .78rem; }
.content-section { padding: 20px 0 46px; }
.content-card { border: 1px solid var(--border); border-radius: var(--radius-md); padding: 20px; background: var(--surface); box-shadow: var(--shadow-sm); }
.content-card + .content-card { margin-top: 18px; }
.content-title { display: flex; align-items: flex-start; justify-content: space-between; gap: 14px; margin-bottom: 16px; }
.content-title h2 { margin: 0; font-size: clamp(1.3rem, 4vw, 1.8rem); letter-spacing: -.03em; }
.content-title p { margin: 4px 0 0; color: var(--muted); font-size: .88rem; }
.table-scroll { overflow-x: auto; border: 1px solid var(--border); border-radius: 14px; }
.postal-table { width: 100%; min-width: 650px; border-collapse: collapse; }
.postal-table th, .postal-table td { padding: 13px 14px; text-align: left; border-bottom: 1px solid var(--border); }
.postal-table th { background: var(--surface-2); color: var(--muted); font-size: .75rem; text-transform: uppercase; letter-spacing: .055em; }
.postal-table tr:last-child td { border-bottom: 0; }
.table-office strong { display: block; }
.table-office span { color: var(--muted); font-size: .82rem; }
.table-code { color: var(--primary-strong); font-weight: 950; letter-spacing: .05em; }
.head-office-grid { display: grid; gap: 12px; }
.head-office-card { padding: 16px; border: 1px solid color-mix(in srgb, var(--accent) 28%, var(--border)); border-radius: 15px; background: var(--accent-soft); }
.head-office-card strong { display: block; }
.head-office-card span { color: var(--muted); font-size: .84rem; }
.faq-list { display: grid; gap: 10px; }
.faq-item { border: 1px solid var(--border); border-radius: 14px; overflow: hidden; }
.faq-question { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 12px; border: 0; padding: 15px; background: var(--surface); color: var(--text); text-align: left; font-weight: 850; }
.faq-answer { display: none; padding: 0 15px 15px; color: var(--muted); font-size: .9rem; }
.faq-item.is-open .faq-answer { display: block; }
.faq-item.is-open .faq-chevron { transform: rotate(180deg); }
.faq-chevron { transition: .18s ease; }
.area-links { display: flex; gap: 9px; flex-wrap: wrap; }
.area-link { padding: 9px 12px; border: 1px solid var(--border); border-radius: 999px; color: var(--primary-strong); background: var(--surface); text-decoration: none; font-size: .83rem; font-weight: 850; }
.area-link:hover { border-color: var(--primary); background: var(--primary-soft); }

@media (min-width: 620px) {
  .search-wrap { grid-template-columns: 1fr auto; }
  .filter-grid { grid-template-columns: repeat(2, 1fr); }
  .result-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .nearby-grid { grid-template-columns: repeat(2, 1fr); }
  .info-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-row { grid-template-columns: repeat(4, 1fr); }
  .head-office-grid { grid-template-columns: repeat(2, 1fr); }
  .home-link { display: inline-flex; }
}

@media (min-width: 860px) {
  .container { width: min(var(--container), calc(100% - 64px)); }
  .hero { padding-top: 92px; }
  .hero-grid { grid-template-columns: minmax(0, 1.55fr) minmax(260px, .65fr); }
  .flag-orb { min-height: 340px; }
  .finder-top, .filter-panel, .results-area { padding-left: 28px; padding-right: 28px; }
  .filter-grid { grid-template-columns: repeat(4, 1fr); }
  .result-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .info-grid { grid-template-columns: repeat(3, 1fr); }
  .address-card { grid-template-columns: 1fr .86fr; }
  .address-copy, .address-example { padding: 34px; }
  .footer-inner { flex-direction: row; align-items: center; justify-content: space-between; }
}

@media (max-width: 500px) {
  .header-inner { min-height: 64px; }
  .brand span:not(.brand-mark) { font-size: .88rem; }
  .brand small { display: none; }
  .hero { padding-top: 46px; }
  .flag-orb { display: none; }
  .finder-card { border-radius: 22px; }
  .finder-top, .filter-panel, .results-area { padding: 17px; }
  .result-card-head { flex-direction: column; }
  .postal-code-box { width: 100%; grid-template-columns: 1fr auto; }
  .postal-code { text-align: center; }
  .results-toolbar { flex-direction: column; }
  .results-actions { width: 100%; }
  .results-actions > * { flex: 1; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}