/* =====================================================
   Research Projects Portal — Main Stylesheet
   ===================================================== */

/* ---------- Reset & Variables ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary:   #003366;
  --primary-light: #005aaa;
  --accent:    #e8a020;
  --danger:    #c0392b;
  --success:   #27ae60;
  --bg:        #f4f6f9;
  --card-bg:   #ffffff;
  --text:      #2c3e50;
  --muted:     #7f8c8d;
  --border:    #dde1e7;
  --radius:    8px;
  --shadow:    0 2px 12px rgba(0,0,0,.10);
  --transition: .2s ease;
  --font:      'Segoe UI', system-ui, -apple-system, sans-serif;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--primary-light); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; }

/* ---------- Typography ---------- */
h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.15rem; }

/* ---------- Utilities ---------- */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap;
}
.hidden { display: none !important; }
.text-center { text-align: center; }
.text-muted { color: var(--muted); }
.mt-1 { margin-top: .5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: .5rem; }
.mb-2 { margin-bottom: 1rem; }
.gap-1 { gap: .5rem; }
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .5rem 1.1rem;
  border: none; border-radius: var(--radius);
  font-size: .9rem; font-family: var(--font);
  font-weight: 600; cursor: pointer;
  transition: background var(--transition), transform var(--transition);
  text-decoration: none;
}
.btn:hover { transform: translateY(-1px); text-decoration: none; }
.btn-primary   { background: var(--primary);       color: #fff; }
.btn-primary:hover { background: var(--primary-light); }
.btn-accent    { background: var(--accent);         color: #fff; }
.btn-accent:hover { background: #d4911c; }
.btn-success   { background: var(--success);        color: #fff; }
.btn-success:hover { background: #219a52; }
.btn-danger    { background: var(--danger);         color: #fff; }
.btn-danger:hover { background: #a93226; }
.btn-outline   { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-sm { padding: .3rem .75rem; font-size: .82rem; }
.btn-lg { padding: .75rem 1.6rem; font-size: 1rem; }
.btn-block { width: 100%; justify-content: center; }
.btn:disabled { opacity: .55; cursor: not-allowed; transform: none; }

/* ---------- Header / Navbar ---------- */
.navbar {
  background: var(--primary);
  color: #fff;
  padding-top: 0;
  padding-bottom: 0;
  padding-left: max(2rem, env(safe-area-inset-left));
  padding-right: max(2rem, env(safe-area-inset-right));
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
  position: sticky; top: 0; z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,.25);
}
.navbar-brand {
  display: flex; align-items: center; gap: .7rem;
  font-size: 1.15rem; font-weight: 700; color: #fff;
  text-decoration: none;
}
.navbar-brand .logo-icon {
  width: 36px; height: 36px;
  background: var(--accent);
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
}
.navbar-nav {
  display: flex; align-items: center; gap: 1rem;
  list-style: none;
}
.navbar-nav a {
  color: rgba(255,255,255,.85);
  font-size: .95rem;
  padding: .3rem .6rem;
  border-radius: 4px;
  transition: background var(--transition);
}
.navbar-nav a:hover, .navbar-nav a.active {
  color: #fff; background: rgba(255,255,255,.15);
  text-decoration: none;
}
.navbar-nav .btn { color: #fff; }

/* ---------- Language Toggle ---------- */
.lang-toggle {
  display: inline-flex; align-items: center; gap: .3rem;
  padding: .25rem .65rem;
  background: rgba(255,255,255,.15);
  border: 1px solid rgba(255,255,255,.4);
  border-radius: 20px;
  color: #fff;
  font-size: .8rem; font-weight: 700; letter-spacing: .04em;
  cursor: pointer; text-transform: uppercase;
  transition: background var(--transition), border-color var(--transition);
  white-space: nowrap;
  font-family: var(--font);
}
.lang-toggle:hover {
  background: rgba(255,255,255,.28);
  border-color: rgba(255,255,255,.7);
}

/* ---------- Hero Banner ---------- */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, #005aaa 60%, #0077cc 100%);
  color: #fff;
  padding-top: 3.5rem;
  padding-bottom: 3.5rem;
  padding-left: max(2rem, env(safe-area-inset-left));
  padding-right: max(2rem, env(safe-area-inset-right));
  text-align: center;
}
.hero h1 { font-size: 2.2rem; margin-bottom: .6rem; }
.hero p   { font-size: 1.05rem; opacity: .88; max-width: 620px; margin: 0 auto 1.5rem; }
.hero-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* ---------- Container ---------- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 0;
  padding-bottom: 0;
  padding-left: max(1.5rem, env(safe-area-inset-left));
  padding-right: max(1.5rem, env(safe-area-inset-right));
}

/* ---------- Section ---------- */
.section { padding-top: 2.5rem; padding-bottom: 2.5rem; }
.section-title {
  font-size: 1.4rem;
  margin-bottom: 1.5rem;
  padding-bottom: .5rem;
  border-bottom: 3px solid var(--accent);
  display: inline-block;
}

/* ---------- Filter / Search Bar ---------- */
.filter-bar {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem 1.5rem;
  margin-bottom: 1.8rem;
  display: flex; flex-wrap: wrap; gap: 1rem; align-items: flex-end;
  box-shadow: var(--shadow);
}
.filter-group { display: flex; flex-direction: column; gap: .3rem; flex: 1 1 180px; }
.filter-group-wide { flex: 2 1 260px; }
.filter-group label { font-size: .82rem; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.filter-bar input,
.filter-bar select {
  padding: .5rem .75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: .92rem;
  background: #fff;
  transition: border var(--transition);
}
.filter-bar input:focus,
.filter-bar select:focus { border-color: var(--primary-light); outline: none; }
.filter-bar .btn { align-self: flex-end; }

/* ---------- Stats Bar ---------- */
.stats-bar {
  display: flex; gap: 1.5rem; flex-wrap: wrap;
  margin-bottom: 1rem;
  align-items: center;
}
.stats-bar .count { color: var(--muted); font-size: .9rem; }

/* ---------- Project Grid ---------- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.4rem;
}

/* ---------- Project Card ---------- */
.project-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem;
  box-shadow: var(--shadow);
  display: flex; flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
}
.project-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0,0,0,.13);
}
.card-header { display: flex; justify-content: space-between; align-items: flex-start; gap: .5rem; margin-bottom: .7rem; }
.card-category {
  font-size: .74rem; font-weight: 700; text-transform: uppercase; letter-spacing: .05em;
  background: var(--primary); color: #fff;
  padding: .2rem .55rem; border-radius: 20px;
  white-space: nowrap;
}
.card-status {
  font-size: .74rem; font-weight: 700;
  padding: .2rem .55rem; border-radius: 20px;
  white-space: nowrap;
}

/* ---------- Availability Status ---------- */
.avail-badge {
  display: inline-flex; align-items: center; gap: .3rem;
  font-size: .74rem; font-weight: 700;
  padding: .2rem .6rem; border-radius: 20px;
  white-space: nowrap;
}
.avail-available { background: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.avail-full       { background: #fff3cd; color: #856404; border: 1px solid #ffeeba; }
.avail-finished   { background: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }
.avail-requested  { background: #fff3cd; color: #856404; border: 1px solid #ffc107; }

/* ---------- Availability Control Panel ---------- */
.availability-panel {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  margin-top: 1.2rem;
  box-shadow: var(--shadow);
}
.availability-panel h4 {
  font-size: .9rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .04em;
  margin-bottom: .7rem;
}
.availability-btn-row { display: flex; gap: .5rem; flex-wrap: wrap; align-items: center; }
.btn-avail-available { background: #27ae60; color: #fff; border: none; }
.btn-avail-available:hover { background: #219a52; }
.btn-avail-full { background: #f39c12; color: #fff; border: none; }
.btn-avail-full:hover { background: #d4891a; }
.btn-avail-finished { background: #c0392b; color: #fff; border: none; }
.btn-avail-finished:hover { background: #a93226; }
.btn-avail-request { background: #e67e22; color: #fff; border: none; }
.btn-avail-request:hover { background: #ca6f1e; }
.avail-finished-msg { font-size: .85rem; color: var(--danger); font-weight: 600; }
.status-pending  { background: #fff3cd; color: #856404; }
.status-approved { background: #d1edda; color: #155724; }
.status-rejected { background: #f8d7da; color: #721c24; }

.card-title { font-size: 1.05rem; font-weight: 700; margin-bottom: .4rem; line-height: 1.35; }
.card-title a { color: var(--text); }
.card-title a:hover { color: var(--primary-light); text-decoration: none; }

.card-meta {
  font-size: .82rem; color: var(--muted);
  display: flex; flex-wrap: wrap; gap: .4rem .9rem;
  margin-bottom: .7rem;
}
.card-meta span { display: flex; align-items: center; gap: .25rem; }

.card-desc {
  font-size: .88rem; color: #4a5568;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: .9rem;
}

.card-tags { display: flex; flex-wrap: wrap; gap: .35rem; margin-bottom: 1rem; }
.tag {
  font-size: .75rem; padding: .18rem .5rem;
  background: #eef2ff; color: #3730a3;
  border-radius: 20px; border: 1px solid #c7d2fe;
}

.card-footer {
  display: flex; gap: .5rem; flex-wrap: wrap;
  border-top: 1px solid var(--border);
  padding-top: .9rem;
  margin-top: auto;
}

/* ---------- Empty State ---------- */
.empty-state {
  text-align: center; padding: 4rem 2rem;
  color: var(--muted);
}
.empty-state .icon { font-size: 3rem; margin-bottom: 1rem; }
.empty-state h3 { margin-bottom: .5rem; color: var(--text); }

/* ---------- Pagination ---------- */
.pagination {
  display: flex; justify-content: center; gap: .4rem;
  margin-top: 2rem; flex-wrap: wrap;
}
.pagination button {
  padding: .4rem .85rem; border: 1px solid var(--border);
  background: #fff; border-radius: var(--radius);
  cursor: pointer; font-size: .9rem;
  transition: all var(--transition);
}
.pagination button:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.pagination button.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ---------- Modal ---------- */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.55);
  z-index: 200;
  display: flex; align-items: center; justify-content: center;
  padding: 1rem;
  opacity: 0; pointer-events: none;
  transition: opacity var(--transition);
}
.modal-overlay.open { opacity: 1; pointer-events: all; }
.modal {
  background: #fff; border-radius: 10px;
  width: 100%; max-width: 680px;
  max-height: 90vh; overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,.3);
  transform: translateY(20px);
  transition: transform var(--transition);
}
.modal-overlay.open .modal { transform: translateY(0); }
.modal-header {
  padding: 1.2rem 1.5rem; border-bottom: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
}
.modal-header h2 { font-size: 1.2rem; }
.modal-close {
  background: none; border: none; font-size: 1.4rem;
  cursor: pointer; color: var(--muted); line-height: 1;
  padding: .2rem .4rem; border-radius: 4px;
  transition: background var(--transition);
}
.modal-close:hover { background: var(--bg); color: var(--text); }
.modal-body { padding: 1.5rem; }
.modal-footer {
  padding: 1rem 1.5rem; border-top: 1px solid var(--border);
  display: flex; justify-content: flex-end; gap: .6rem;
}

/* ---------- Forms ---------- */
.form-group { margin-bottom: 1.2rem; }
.form-group label {
  display: block; font-size: .88rem; font-weight: 600;
  margin-bottom: .35rem; color: var(--text);
}
.form-group label .required { color: var(--danger); margin-left: .2rem; }
.form-control {
  width: 100%;
  padding: .6rem .85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: .95rem;
  font-family: var(--font);
  background: #fff;
  transition: border var(--transition), box-shadow var(--transition);
}
.form-control:focus {
  outline: none;
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(0,90,170,.12);
}
textarea.form-control { resize: vertical; min-height: 100px; }
.form-hint { font-size: .78rem; color: var(--muted); margin-top: .25rem; }
.form-error { font-size: .78rem; color: var(--danger); margin-top: .25rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }

/* ---------- File Upload ---------- */
.file-drop {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  background: #fafbff;
}
.file-drop:hover, .file-drop.dragover {
  border-color: var(--primary-light);
  background: #eef4ff;
}
.file-drop .icon { font-size: 2rem; margin-bottom: .5rem; }
.file-drop p { color: var(--muted); font-size: .9rem; }
.file-drop input[type="file"] { display: none; }
.file-list { margin-top: .75rem; list-style: none; }
.file-list li {
  display: flex; justify-content: space-between; align-items: center;
  padding: .35rem .6rem; background: #f0f4ff;
  border-radius: 4px; font-size: .85rem; margin-bottom: .3rem;
}
.file-list li button {
  background: none; border: none; cursor: pointer;
  color: var(--danger); font-size: .9rem;
}

/* ---------- Alerts ---------- */
.alert {
  padding: .85rem 1.1rem; border-radius: var(--radius);
  margin-bottom: 1rem; font-size: .92rem;
  display: flex; align-items: flex-start; gap: .6rem;
}
.alert-success { background: #d1edda; color: #155724; border-left: 4px solid var(--success); }
.alert-danger   { background: #f8d7da; color: #721c24; border-left: 4px solid var(--danger);  }
.alert-warning  { background: #fff3cd; color: #856404; border-left: 4px solid var(--accent);  }
.alert-info     { background: #d1ecf1; color: #0c5460; border-left: 4px solid #17a2b8;        }

/* ---------- Detail Page ---------- */
.detail-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 2rem;
  align-items: start;
}
.detail-main {}
.detail-sidebar {}
.detail-sidebar .card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.2rem; margin-bottom: 1.2rem; box-shadow: var(--shadow); }
.detail-sidebar .card h3 { font-size: .95rem; margin-bottom: .8rem; padding-bottom: .4rem; border-bottom: 2px solid var(--accent); }

.project-detail-header { margin-bottom: 1.5rem; }
.project-detail-header h1 { font-size: 1.7rem; margin-bottom: .5rem; line-height: 1.3; }
.meta-row {
  display: flex; flex-wrap: wrap; gap: .5rem 1.2rem;
  font-size: .88rem; color: var(--muted);
  margin-bottom: 1rem;
}
.meta-row span { display: flex; align-items: center; gap: .3rem; }
.section-block { margin-bottom: 1.5rem; }
.section-block h2 { font-size: 1.05rem; font-weight: 700; margin-bottom: .6rem; color: var(--primary); }
.section-block p, .section-block ul { font-size: .95rem; color: var(--text); }
.section-block ul { padding-left: 1.2rem; }
.section-block ul li { margin-bottom: .3rem; }

/* ---------- Admin Layout ---------- */
.admin-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: calc(100vh - 64px); /* 64px = navbar height */
}
.admin-sidebar {
  background: var(--primary);
  padding: 1.5rem 0;
  color: #fff;
}
.admin-sidebar .sidebar-logo {
  padding: 0 1.2rem 1.2rem;
  border-bottom: 1px solid rgba(255,255,255,.15);
  margin-bottom: 1rem;
  font-weight: 700;
}
.sidebar-menu { list-style: none; }
.sidebar-menu li a {
  display: flex; align-items: center; gap: .6rem;
  padding: .7rem 1.2rem;
  color: rgba(255,255,255,.78);
  font-size: .92rem;
  border-left: 3px solid transparent;
  transition: all var(--transition);
  text-decoration: none;
}
.sidebar-menu li a:hover,
.sidebar-menu li a.active {
  color: #fff;
  background: rgba(255,255,255,.1);
  border-left-color: var(--accent);
  text-decoration: none;
}
.admin-content {
  padding: 2rem;
  background: var(--bg);
  overflow-y: auto;
}
.admin-content h1 { font-size: 1.5rem; margin-bottom: 1.5rem; }

/* ---------- Stats Cards (admin) ---------- */
.stat-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1.1rem;
  margin-bottom: 2rem;
}
.stat-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.2rem 1.4rem;
  box-shadow: var(--shadow);
  display: flex; align-items: center; gap: 1rem;
}
.stat-card .stat-icon {
  width: 48px; height: 48px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
}
.stat-card .stat-value { font-size: 1.8rem; font-weight: 700; line-height: 1; }
.stat-card .stat-label { font-size: .78rem; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.bg-blue   { background: #dbeafe; }
.bg-green  { background: #d1fae5; }
.bg-yellow { background: #fef3c7; }
.bg-red    { background: #fee2e2; }

/* ---------- Data Table ---------- */
.table-wrap {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow-x: auto;
}
.data-table {
  width: 100%; border-collapse: collapse;
  font-size: .9rem;
}
.data-table th {
  background: #f8fafc;
  padding: .75rem 1rem;
  text-align: left;
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.data-table td {
  padding: .85rem 1rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: #f8fafc; }
.data-table .actions { display: flex; gap: .4rem; flex-wrap: wrap; }

/* ---------- Admin Login ---------- */
.login-wrap {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--primary), #0077cc);
  padding: 1rem;
}
.login-card {
  background: #fff;
  border-radius: 12px;
  padding: 2.5rem;
  width: 100%; max-width: 420px;
  box-shadow: 0 20px 60px rgba(0,0,0,.25);
}
.login-card .login-logo {
  text-align: center; margin-bottom: 1.8rem;
}
.login-card .login-logo .icon {
  width: 64px; height: 64px; border-radius: 14px;
  background: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 2rem; color: #fff;
  margin: 0 auto .75rem;
}
.login-card h2 { font-size: 1.4rem; margin-bottom: .3rem; }
.login-card p  { color: var(--muted); font-size: .9rem; margin-bottom: 0; }

/* ---------- Badge ---------- */
.badge {
  display: inline-block;
  padding: .18rem .5rem;
  border-radius: 20px;
  font-size: .73rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.badge-primary  { background: var(--primary);       color: #fff; }
.badge-success  { background: var(--success);        color: #fff; }
.badge-danger   { background: var(--danger);         color: #fff; }
.badge-warning  { background: var(--accent);         color: #fff; }
.badge-secondary{ background: #e2e8f0;               color: #475569; }

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  display: flex; align-items: center; gap: .4rem;
  font-size: .85rem; color: var(--muted);
  margin-bottom: 1rem; flex-wrap: wrap;
}
.breadcrumb a { color: var(--primary-light); }
.breadcrumb .sep { color: var(--border); }

/* ---------- Toast ---------- */
#toast-container {
  position: fixed; bottom: 1.5rem; right: 1.5rem;
  z-index: 999; display: flex; flex-direction: column; gap: .5rem;
}
.toast {
  background: #2d3748; color: #fff;
  padding: .75rem 1.1rem; border-radius: var(--radius);
  font-size: .9rem; box-shadow: 0 4px 15px rgba(0,0,0,.25);
  display: flex; align-items: center; gap: .6rem;
  animation: slideIn .25s ease;
  min-width: 240px;
}
.toast.success { background: var(--success); }
.toast.error   { background: var(--danger); }
.toast.warning { background: #d97706; }
@keyframes slideIn {
  from { transform: translateX(120%); opacity: 0; }
  to   { transform: translateX(0);    opacity: 1; }
}

/* ---------- Footer ---------- */
.footer {
  background: var(--primary);
  color: rgba(255,255,255,.7);
  text-align: center;
  padding: 1.5rem;
  font-size: .85rem;
  margin-top: auto;
}
.footer a { color: rgba(255,255,255,.85); }

/* ---------- Active tab (admin filter tabs) ---------- */
.active-tab {
  background: var(--primary) !important;
  color: #fff !important;
  border-color: var(--primary) !important;
}

/* ---------- Hamburger Menu ---------- */
.navbar-toggler {
  display: none;
  background: none; border: none; cursor: pointer;
  padding: .4rem;
  color: #fff;
  font-size: 1.4rem;
  line-height: 1;
}

/* ---------- Link-styled Button ---------- */
.btn-link {
  background: none; border: none; padding: 0;
  color: var(--primary-light); font-size: inherit;
  cursor: pointer; font-family: var(--font);
  text-decoration: none;
}
.btn-link:hover { text-decoration: underline; }

/* ---------- Admin Mobile Nav ---------- */
.admin-mobile-nav {
  display: none;
  background: var(--primary);
  padding: .5rem 1rem;
  gap: .5rem;
  flex-wrap: wrap;
}
.admin-mobile-nav a, .admin-mobile-nav button {
  color: rgba(255,255,255,.85);
  font-size: .88rem;
  padding: .35rem .7rem;
  border-radius: 4px;
  border: 1px solid rgba(255,255,255,.3);
  background: none;
  cursor: pointer;
  text-decoration: none;
  font-family: var(--font);
  font-weight: 600;
}
.admin-mobile-nav a:hover, .admin-mobile-nav button:hover {
  background: rgba(255,255,255,.15);
  color: #fff;
  text-decoration: none;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .detail-layout { grid-template-columns: 1fr; }
  .admin-layout  { grid-template-columns: 1fr; }
  .admin-sidebar { display: none; }
  .admin-mobile-nav { display: flex; }
  .form-row { grid-template-columns: 1fr; }
  .data-table { font-size: .82rem; }
  .data-table th, .data-table td { padding: .6rem .75rem; }
}

/* ---------- Tablet (641px – 900px) ---------- */
@media (min-width: 641px) and (max-width: 900px) {
  .project-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-cards   { grid-template-columns: repeat(3, 1fr); }
  .filter-bar   { gap: .75rem; }
  /* Increase horizontal padding on tablets for visual breathing room */
  .container {
    padding-left: max(2rem, env(safe-area-inset-left));
    padding-right: max(2rem, env(safe-area-inset-right));
  }
}

@media (max-width: 640px) {
  .navbar {
    padding-top: 0;
    padding-bottom: 0;
    padding-left: max(1rem, env(safe-area-inset-left));
    padding-right: max(1rem, env(safe-area-inset-right));
  }
  .navbar-nav { display: none; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: var(--primary); padding: 1rem; gap: .5rem; z-index: 99; box-shadow: 0 4px 12px rgba(0,0,0,.2); }
  .navbar-nav.open { display: flex; }
  .navbar-toggler { display: block; }
  /* Ensure main content container keeps consistent safe-area-aware margins on mobile */
  .container {
    padding-left: max(1.5rem, env(safe-area-inset-left));
    padding-right: max(1.5rem, env(safe-area-inset-right));
  }
  .hero {
    padding-top: 2rem;
    padding-bottom: 2rem;
    padding-left: max(1.5rem, env(safe-area-inset-left));
    padding-right: max(1.5rem, env(safe-area-inset-right));
  }
  .hero h1 { font-size: 1.5rem; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { justify-content: center; }
  .project-grid { grid-template-columns: 1fr; }
  .filter-bar { flex-direction: column; align-items: stretch; }
  .filter-bar .btn { width: 100%; justify-content: center; }
  /* In column layout, flex-basis acts as min-height; reset to natural height */
  .filter-bar .filter-group, .filter-bar .filter-group-wide { flex: none; width: 100%; }
  .stat-cards { grid-template-columns: 1fr 1fr; }
  h1 { font-size: 1.5rem; }
  .login-card { padding: 1.5rem 1.2rem; }
  .modal { margin: 0 .5rem; }
  .table-wrap { overflow-x: auto; }
  /* Prevent iOS Safari auto-zoom on focused inputs (requires font-size ≥ 16px) */
  .form-control { font-size: 1rem; }
  /* Toast: fill viewport width on small screens */
  #toast-container { left: 1rem; right: 1rem; bottom: 1rem; }
  .toast { min-width: unset; width: 100%; }
  /* Stack card footer buttons */
  .card-footer { flex-direction: column; }
  .card-footer .btn { width: 100%; justify-content: center; }
  /* Adequate touch targets for buttons */
  .btn { min-height: 44px; }
  .btn-sm { min-height: 38px; }
  /* Tighten admin content padding */
  .admin-content { padding: 1rem; }
  /* Better spacing for admin mobile nav links */
  .admin-mobile-nav a, .admin-mobile-nav button { min-height: 44px; display: inline-flex; align-items: center; }
  /* Pagination: tighter on small screens */
  .pagination button { padding: .4rem .65rem; font-size: .85rem; }
  /* Prevent horizontal scroll on mobile */
  body { overflow-x: hidden; }
  /* Ensure footer text wraps on narrow screens */
  .footer { overflow-wrap: break-word; }
}