/* =========================================================
   BD Research Hub — Mockup Stylesheet
   Designed to convert directly into an OJS 3.4 child theme.
   Matches Health Sciences theme structure (Bootstrap 4 base).
   ========================================================= */

:root {
  /* === Brand palette (this is what becomes the OJS theme color) === */
  --teal-900: #0a3640;
  --teal-700: #0f4c5c;
  --teal-500: #1e7a8c;
  --teal-100: #d6ecf0;
  --teal-50:  #eef7f9;

  --warm-600: #c4530c;
  --warm-500: #e36414;
  --warm-100: #fbe6d4;

  --sand-200: #f2e9dc;
  --sand-100: #f7f1e6;

  --ink-900: #16181a;
  --ink-700: #2a2e33;
  --ink-500: #5a6068;
  --ink-300: #aab0b8;
  --ink-200: #d8dde2;
  --ink-100: #ebeef1;

  --paper:    #fafaf7;
  --paper-2:  #ffffff;

  /* === Typography === */
  --font-display: 'Fraunces', 'Tinos', Georgia, serif;
  --font-body:    'DM Sans', 'Helvetica Neue', system-ui, sans-serif;
  --font-bangla:  'Hind Siliguri', 'Noto Sans Bengali', sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, monospace;

  /* === Layout === */
  --container: 1240px;
  --container-narrow: 880px;

  --r-sm: 4px;
  --r-md: 8px;
  --r-lg: 16px;
  --shadow-1: 0 1px 2px rgba(10,54,64,0.06), 0 4px 12px rgba(10,54,64,0.04);
  --shadow-2: 0 4px 24px rgba(10,54,64,0.10);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink-900);
  line-height: 1.55;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
body.bn { font-family: var(--font-bangla); }
body.bn .display { font-family: var(--font-bangla); font-weight: 600; letter-spacing: 0; }

img { max-width: 100%; display: block; }
a { color: var(--teal-700); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--warm-500); }

.container { max-width: var(--container); margin: 0 auto; padding: 0 32px; }
.container-narrow { max-width: var(--container-narrow); margin: 0 auto; padding: 0 32px; }

/* ---------- Typography ---------- */
.display {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: -0.02em;
  font-variation-settings: 'opsz' 144, 'SOFT' 50;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--teal-500);
  font-weight: 500;
}
.muted { color: var(--ink-500); }
.bn .eyebrow { font-family: var(--font-bangla); letter-spacing: 0.05em; font-size: 12px; }

h1.display { font-size: clamp(40px, 5vw, 68px); line-height: 1.05; }
h2.display { font-size: clamp(28px, 3vw, 42px); line-height: 1.1; }
h3.display { font-size: clamp(20px, 2vw, 26px); line-height: 1.25; }

/* ---------- Mockup helper banner ---------- */
.mockup-note {
  background: var(--ink-900);
  color: #c8ced4;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  padding: 6px 0;
  border-bottom: 2px solid var(--warm-500);
}

/* ---------- Custom-feature flag (mockup only) ---------- */
/* Appears on UI elements that go beyond stock OJS 3.4.
   Visual reminders during client review. Remove for production. */
.custom-flag {
  display: inline-block;
  background: #fef3c7;
  color: #92400e;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid #fde68a;
  vertical-align: middle;
  margin-left: 8px;
}
.custom-flag::before { content: '⚙ '; }
.stock-flag {
  display: inline-block;
  background: #dcfce7;
  color: #166534;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid #bbf7d0;
  vertical-align: middle;
  margin-left: 8px;
}
.stock-flag::before { content: '✓ '; }
/* Section-level outline indicating custom block */
.custom-section-outline {
  position: relative;
  outline: 2px dashed #f59e0b;
  outline-offset: -2px;
}
.custom-section-outline::before {
  content: 'CUSTOM BLOCK · NOT STOCK OJS';
  position: absolute;
  top: 8px; right: 8px;
  background: #f59e0b; color: #fff;
  font-family: var(--font-mono); font-size: 9px;
  font-weight: 600; text-transform: uppercase; letter-spacing: 0.15em;
  padding: 4px 10px;
  border-radius: 3px;
  z-index: 5;
}
/* Toggle button to hide flags for clean preview */
.flag-toggle {
  position: fixed;
  bottom: 16px; right: 16px;
  background: var(--ink-900); color: #fff;
  font-family: var(--font-mono); font-size: 11px;
  padding: 8px 14px;
  border-radius: 999px; border: 0;
  cursor: pointer;
  z-index: 100;
  box-shadow: var(--shadow-2);
  letter-spacing: 0.05em;
}
body.no-flags .custom-flag,
body.no-flags .stock-flag { display: none; }
body.no-flags .custom-section-outline { outline: none; }
body.no-flags .custom-section-outline::before { display: none; }
body.no-flags .mockup-note { display: none; }
.mockup-note .container {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
.mockup-note .badge {
  background: var(--warm-500); color: #fff;
  padding: 2px 10px; border-radius: 999px;
  text-transform: uppercase; letter-spacing: 0.15em;
}
.mockup-note .ojs-page {
  color: #8b9298; font-style: normal;
}
.mockup-note .ojs-page code { color: #c8ced4; }

/* ---------- Top utility bar ---------- */
.utility-bar {
  background: var(--paper-2);
  color: var(--ink-500);
  font-size: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--ink-100);
}
.utility-bar .container {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
.utility-bar a { color: var(--ink-500); }
.utility-bar a:hover { color: var(--teal-700); }
.utility-links { display: flex; gap: 18px; align-items: center; }
.lang-toggle {
  display: inline-flex; gap: 4px; align-items: center;
  background: var(--ink-100);
  border-radius: 999px; padding: 2px;
  font-family: var(--font-mono); font-size: 11px;
}
.lang-toggle button {
  background: none; border: 0; color: var(--ink-500);
  padding: 4px 12px; border-radius: 999px; cursor: pointer;
  font-family: inherit; font-size: inherit;
  transition: all .15s ease;
}
.lang-toggle button.active { background: var(--teal-700); color: #fff; }

/* ---------- Header ---------- */
.site-header {
  background: var(--paper-2);
  border-bottom: 1px solid var(--ink-200);
  position: sticky; top: 0; z-index: 50;
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 18px; padding-bottom: 18px; gap: 32px;
}
.brand { display: flex; align-items: center; gap: 14px; }
.brand-mark {
  width: 44px; height: 44px;
  background: var(--teal-700);
  border-radius: 50%;
  position: relative;
  display: grid; place-items: center;
  color: #fff;
  font-family: var(--font-display); font-size: 22px;
  letter-spacing: -0.04em;
  flex-shrink: 0;
}
.brand-mark::after {
  content: ''; position: absolute;
  inset: -4px; border-radius: 50%;
  border: 1px solid var(--warm-500);
  pointer-events: none;
}
.brand-name {
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--ink-900);
}
.brand-tagline {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--ink-500);
  margin-top: 4px;
}
.bn .brand-tagline { font-family: var(--font-bangla); letter-spacing: 0.05em; }

.main-nav { display: flex; align-items: center; gap: 28px; }
.main-nav a {
  color: var(--ink-700);
  font-weight: 500; font-size: 14px;
  position: relative; padding: 4px 0;
}
.main-nav a:hover { color: var(--teal-700); }
.main-nav a.active { color: var(--teal-700); }
.main-nav a.active::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: -22px;
  height: 2px; background: var(--warm-500);
}

.nav-cta {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--ink-900); color: #fff;
  padding: 10px 18px; border-radius: 999px;
  font-size: 13px; font-weight: 500;
}
.nav-cta:hover { background: var(--teal-700); color: #fff; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 24px;
  border-radius: 999px;
  border: 0; cursor: pointer;
  font-family: var(--font-body); font-size: 14px; font-weight: 500;
  text-decoration: none;
  transition: transform .15s ease, background .2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--warm-500); color: #fff; }
.btn-primary:hover { background: var(--warm-600); color: #fff; }
.btn-secondary { background: var(--teal-700); color: #fff; }
.btn-secondary:hover { background: var(--teal-900); color: #fff; }
.btn-ghost { background: transparent; color: var(--ink-900); border: 1px solid var(--ink-200); }
.btn-ghost:hover { border-color: var(--teal-700); color: var(--teal-700); }
.btn-sm { padding: 10px 18px; font-size: 13px; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink-900);
  color: #c8ced4;
  padding: 72px 0 32px;
  margin-top: 96px;
}
.site-footer .container { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; }
.site-footer h4 { color: #fff; font-family: var(--font-display); font-size: 18px; margin-bottom: 18px; font-weight: 500; }
.site-footer ul { list-style: none; display: flex; flex-direction: column; gap: 10px; font-size: 14px; }
.site-footer a { color: #c8ced4; }
.site-footer a:hover { color: var(--warm-500); }
.footer-brand p { font-size: 14px; line-height: 1.6; max-width: 32ch; margin-top: 12px; color: #c8ced4; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  margin-top: 56px; padding-top: 24px;
  display: flex; justify-content: space-between; align-items: center; font-size: 12px;
  color: #8b9298;
}
.footer-bottom .badges { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.footer-bottom .badge {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.15em; text-transform: uppercase;
  padding: 6px 10px; border: 1px solid rgba(255,255,255,0.12); border-radius: 999px;
}

/* ---------- Cards ---------- */
.card {
  background: var(--paper-2);
  border: 1px solid var(--ink-200);
  border-radius: var(--r-md);
  transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
  text-decoration: none; color: inherit;
}
.card:hover { border-color: var(--teal-500); transform: translateY(-2px); box-shadow: var(--shadow-1); }

.tag {
  display: inline-block;
  font-family: var(--font-mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: 0.12em;
  padding: 3px 10px; border-radius: 999px;
  background: var(--teal-50); color: var(--teal-700);
  font-weight: 500;
}
.tag-warm { background: var(--warm-100); color: var(--warm-600); }
.tag-sand { background: var(--sand-200); color: var(--ink-700); }
.tag-green { background: #d8f3dc; color: #1b4332; }
.tag-purple { background: #e9d8fd; color: #4a2876; }
.tag-red { background: #fee2e2; color: #991b1b; }
.tag-blue { background: #dbeafe; color: #1e40af; }

.bn .tag { font-family: var(--font-bangla); letter-spacing: 0.02em; }

/* ---------- Page intro / breadcrumb ---------- */
.page-intro {
  padding: 56px 0 40px;
  background: var(--sand-100);
  border-bottom: 1px solid var(--ink-200);
}
.breadcrumb {
  font-family: var(--font-mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: 0.15em;
  color: var(--ink-500); margin-bottom: 16px;
}
.breadcrumb a { color: var(--ink-500); }
.breadcrumb a:hover { color: var(--teal-700); }
.breadcrumb .sep { margin: 0 8px; color: var(--ink-300); }
.bn .breadcrumb { font-family: var(--font-bangla); letter-spacing: 0.05em; font-size: 13px; }

/* ---------- Search row ---------- */
.search-row {
  display: flex; gap: 0; max-width: 640px;
  background: #fff; border: 1px solid var(--ink-200);
  border-radius: 999px; padding: 6px;
  box-shadow: var(--shadow-1);
}
.search-row input {
  flex: 1; border: 0; outline: 0; padding: 12px 18px;
  font-family: var(--font-body); font-size: 15px; background: transparent; color: var(--ink-900);
}
.bn .search-row input { font-family: var(--font-bangla); }

/* ---------- Animations ---------- */
@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}
.rise { animation: rise .8s ease both; }
.delay-1 { animation-delay: .1s; }
.delay-2 { animation-delay: .2s; }
.delay-3 { animation-delay: .3s; }
.delay-4 { animation-delay: .4s; }

/* ---------- Decorative ---------- */
.divider { height: 1px; background: var(--ink-200); margin: 32px 0; }

/* ---------- Sidebar (used on journal/article pages) ---------- */
.with-sidebar {
  display: grid; grid-template-columns: 1fr 280px; gap: 56px;
  padding: 56px 0;
}
.sidebar h4 {
  font-family: var(--font-display); font-size: 16px; font-weight: 500;
  margin-bottom: 16px; padding-bottom: 12px; border-bottom: 2px solid var(--warm-500);
}
.sidebar ul { list-style: none; display: flex; flex-direction: column; gap: 8px; font-size: 14px; }
.sidebar ul a { color: var(--ink-700); }
.sidebar-block { margin-bottom: 40px; }

/* ---------- Article specific ---------- */
.article-meta {
  display: flex; flex-wrap: wrap; gap: 16px 24px;
  font-size: 13px; color: var(--ink-500);
  border-top: 1px solid var(--ink-200);
  border-bottom: 1px solid var(--ink-200);
  padding: 16px 0;
  margin: 32px 0;
}
.article-meta strong { color: var(--ink-900); font-weight: 500; }

.author-list { display: flex; flex-wrap: wrap; gap: 12px 28px; margin-top: 16px; }
.author { font-size: 15px; }
.author-name { font-weight: 500; color: var(--ink-900); }
.author-affil { font-size: 12px; color: var(--ink-500); margin-top: 2px; }

.galley-list { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.galley-btn {
  display: inline-flex; align-items: center; gap: 10px;
  background: var(--teal-700); color: #fff;
  padding: 12px 20px; border-radius: var(--r-sm);
  font-size: 14px; font-weight: 500;
  text-decoration: none;
}
.galley-btn:hover { background: var(--teal-900); color: #fff; }
.galley-btn .ext {
  background: rgba(255,255,255,0.2); padding: 2px 8px; border-radius: 4px;
  font-family: var(--font-mono); font-size: 11px;
}

.abstract-block {
  background: var(--sand-100);
  border-left: 4px solid var(--warm-500);
  padding: 28px 32px;
  border-radius: 0 var(--r-md) var(--r-md) 0;
  margin: 32px 0;
}
.abstract-block h3 {
  font-family: var(--font-display); font-size: 18px; font-weight: 500;
  margin-bottom: 12px;
}
.abstract-block p { font-size: 15px; line-height: 1.7; color: var(--ink-700); }

.keywords {
  display: flex; flex-wrap: wrap; gap: 8px;
  margin: 24px 0;
}
.keyword {
  background: var(--teal-50); color: var(--teal-700);
  padding: 4px 12px; border-radius: 999px;
  font-size: 12px; font-weight: 500;
}

/* ---------- Issue / TOC ---------- */
.toc-section {
  border-top: 2px solid var(--ink-900);
  padding-top: 24px; margin-top: 40px;
}
.toc-section-title {
  font-family: var(--font-display); font-size: 22px; font-weight: 500;
  margin-bottom: 24px; color: var(--ink-900);
}
.toc-item {
  padding: 24px 0;
  border-bottom: 1px solid var(--ink-200);
}
.toc-item:last-child { border-bottom: 0; }
.toc-title {
  font-family: var(--font-display); font-size: 20px; line-height: 1.3; font-weight: 400;
  color: var(--ink-900);
  display: block; margin-bottom: 8px;
  text-decoration: none;
}
.toc-title:hover { color: var(--teal-700); }
.toc-authors { font-size: 14px; color: var(--ink-500); margin-bottom: 8px; }
.toc-meta {
  display: flex; gap: 16px; align-items: center; font-size: 13px;
  font-family: var(--font-mono); color: var(--ink-500);
}
.toc-meta a { color: var(--teal-700); }
.toc-pages { color: var(--ink-700); font-weight: 500; }

/* ---------- Editorial team grid ---------- */
.team-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 32px; margin-top: 40px;
}
.team-member {
  text-align: left;
}
.team-photo {
  width: 100%; aspect-ratio: 1; border-radius: var(--r-md);
  background: linear-gradient(135deg, var(--teal-100), var(--sand-200));
  display: grid; place-items: center;
  font-family: var(--font-display); font-size: 48px; color: var(--teal-700);
  margin-bottom: 16px;
}
.team-role { font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.15em; color: var(--warm-500); }
.team-name { font-family: var(--font-display); font-size: 18px; line-height: 1.3; margin: 4px 0; }
.team-affil { font-size: 13px; color: var(--ink-500); }

/* ---------- Mobile ---------- */
.menu-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.menu-toggle svg { width: 24px; height: 24px; }

@media (max-width: 900px) {
  .main-nav { display: none; }
  .menu-toggle { display: block; }
  .site-footer .container { grid-template-columns: 1fr 1fr; }
  .with-sidebar { grid-template-columns: 1fr; gap: 40px; padding: 40px 0; }
  .sidebar { order: 2; }
}
@media (max-width: 600px) {
  .container { padding: 0 20px; }
  .site-footer .container { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 12px; align-items: flex-start; }
  .mockup-note .container { flex-direction: column; gap: 8px; align-items: flex-start; }
}