:root {
  --primary:   #1a3a6b;
  --accent:    #e8a020;
  --success:   #16a34a;
  --danger:    #dc2626;
  --bg:        #f8f9fc;
  --surface:   #ffffff;
  --border:    #e2e8f0;
  --text:      #1e293b;
  --muted:     #64748b;
  --radius:    10px;
  --shadow:    0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.05);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 15px;
}

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

/* ── LAYOUT ── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ── NAVBAR ── */
.navbar {
  background: var(--primary);
  position: sticky; top: 0; z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,.2);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: #fff; font-size: 18px; font-weight: 600; }
.brand:hover { text-decoration: none; }
.brand-dot { width: 10px; height: 10px; background: var(--accent); border-radius: 50%; }
.nav-links { display: flex; gap: 24px; list-style: none; align-items: center; }
.nav-links a { color: rgba(255,255,255,.85); font-size: 14px; font-weight: 500; transition: color .2s; }
.nav-links a:hover { color: #fff; text-decoration: none; }
.btn-admin {
  background: var(--accent); color: #fff !important;
  padding: 6px 16px; border-radius: 6px;
}
.btn-admin:hover { background: #c98a10; }

/* ── HERO ── */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, #2d5a9e 100%);
  color: #fff;
  padding: 72px 0 80px;
  text-align: center;
}
.hero h1 { font-size: clamp(26px, 4vw, 42px); font-weight: 700; margin-bottom: 16px; }
.hero p  { font-size: 18px; opacity: .85; max-width: 600px; margin: 0 auto 36px; }
.hero-search {
  display: flex; max-width: 640px; margin: 0 auto 28px;
  background: #fff; border-radius: 50px;
  overflow: hidden; box-shadow: 0 4px 20px rgba(0,0,0,.25);
}
.hero-search input {
  flex: 1; border: none; outline: none; padding: 14px 22px;
  font-size: 16px; color: var(--text);
}
.hero-search button {
  background: var(--accent); color: #fff;
  border: none; padding: 0 28px; cursor: pointer;
  font-size: 15px; font-weight: 600;
  transition: background .2s;
}
.hero-search button:hover { background: #c98a10; }
.hero-stats { display: flex; gap: 32px; justify-content: center; opacity: .85; font-size: 14px; }
.hero-stats span { display: flex; align-items: center; gap: 6px; }
.hero-stats strong { font-size: 20px; font-weight: 700; }

/* ── SECTIONS ── */
.section { padding: 64px 0; }
.section-alt { background: var(--surface); }
.section-header { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 28px; }
.section-title { font-size: 22px; font-weight: 700; margin-bottom: 28px; }
.link-all { font-size: 14px; font-weight: 500; color: var(--primary); }

/* ── CATEGORY GRID ── */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.cat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 20px;
  display: flex; flex-direction: column; gap: 8px;
  transition: box-shadow .2s, transform .2s;
  color: var(--text);
}
.cat-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
  text-decoration: none;
}
.cat-icon   { font-size: 32px; }
.cat-card h3 { font-size: 15px; font-weight: 600; }
.cat-card p  { font-size: 13px; color: var(--muted); flex: 1; }
.cat-count  { font-size: 12px; font-weight: 600; color: var(--primary); margin-top: 4px; }

/* ── DOCUMENT LIST ── */
.doc-list   { display: flex; flex-direction: column; gap: 12px; }
.doc-card {
  display: flex; align-items: center; gap: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  transition: box-shadow .2s;
}
.doc-card:hover { box-shadow: var(--shadow); }
.doc-ext {
  flex-shrink: 0;
  width: 52px; height: 52px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 8px; font-size: 11px; font-weight: 700; color: #fff;
  background: var(--muted);
}
.doc-ext.pdf  { background: #dc2626; }
.doc-ext.docx, .doc-ext.doc { background: #2563eb; }
.doc-ext.xlsx, .doc-ext.xls { background: #16a34a; }
.doc-ext.pptx, .doc-ext.ppt { background: #ea580c; }
.doc-info   { flex: 1; min-width: 0; }
.doc-title  { font-size: 15px; font-weight: 600; display: block; margin-bottom: 4px; color: var(--text); }
.doc-title:hover { color: var(--primary); }
.doc-meta   { font-size: 12px; color: var(--muted); display: flex; gap: 8px; flex-wrap: wrap; }
.btn-download {
  flex-shrink: 0;
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  background: var(--primary); color: #fff;
  border-radius: 8px; font-size: 18px;
  transition: background .2s;
}
.btn-download:hover { background: #0f2850; text-decoration: none; }

/* ── SEARCH PAGE ── */
.search-bar { display: flex; gap: 12px; margin-bottom: 28px; }
.search-bar input {
  flex: 1; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 12px 16px; font-size: 15px; outline: none;
  transition: border-color .2s;
}
.search-bar input:focus { border-color: var(--primary); }
.search-bar button {
  background: var(--primary); color: #fff;
  border: none; border-radius: var(--radius);
  padding: 0 24px; cursor: pointer; font-size: 15px; font-weight: 600;
}
.filters { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 24px; }
.filters select {
  border: 1px solid var(--border); border-radius: 8px;
  padding: 8px 12px; font-size: 13px; color: var(--text);
  outline: none; background: var(--surface);
}
.result-meta { font-size: 13px; color: var(--muted); margin-bottom: 16px; }
.pagination { display: flex; gap: 8px; margin-top: 32px; justify-content: center; }
.pagination button {
  border: 1px solid var(--border); background: var(--surface);
  border-radius: 8px; padding: 8px 16px; cursor: pointer; font-size: 14px;
}
.pagination button.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.pagination button:disabled { opacity: .4; cursor: not-allowed; }

/* ── DOCUMENT DETAIL ── */
.doc-detail { display: grid; grid-template-columns: 1fr 320px; gap: 32px; padding: 48px 0; }
.doc-preview { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.doc-preview iframe { width: 100%; height: 600px; border: none; }
.doc-sidebar { display: flex; flex-direction: column; gap: 20px; }
.meta-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.meta-card h3 { font-size: 14px; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); margin-bottom: 14px; }
.meta-row { display: flex; gap: 8px; margin-bottom: 10px; font-size: 13px; }
.meta-label { color: var(--muted); min-width: 100px; }
.meta-value { font-weight: 500; }
.tag-list { display: flex; flex-wrap: wrap; gap: 6px; }
.tag { background: #eff6ff; color: var(--primary); border-radius: 20px; padding: 4px 12px; font-size: 12px; font-weight: 500; }
.btn-dl-full {
  display: block; text-align: center;
  background: var(--primary); color: #fff;
  padding: 14px; border-radius: var(--radius);
  font-size: 16px; font-weight: 600;
  transition: background .2s;
}
.btn-dl-full:hover { background: #0f2850; text-decoration: none; }

/* ── ADMIN ── */
.admin-layout { display: grid; grid-template-columns: 240px 1fr; min-height: 100vh; }
.sidebar { background: var(--primary); color: #fff; padding: 0; }
.sidebar-brand { padding: 20px 24px; font-size: 16px; font-weight: 700; border-bottom: 1px solid rgba(255,255,255,.1); }
.sidebar-nav { list-style: none; padding: 12px 0; }
.sidebar-nav li a { display: block; padding: 11px 24px; color: rgba(255,255,255,.8); font-size: 14px; transition: all .2s; }
.sidebar-nav li a:hover, .sidebar-nav li a.active { background: rgba(255,255,255,.12); color: #fff; text-decoration: none; }
.admin-main { padding: 32px; background: var(--bg); }
.page-title { font-size: 24px; font-weight: 700; margin-bottom: 28px; }
.stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 16px; margin-bottom: 32px; }
.stat-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; }
.stat-card .stat-num { font-size: 28px; font-weight: 700; color: var(--primary); }
.stat-card .stat-lbl { font-size: 13px; color: var(--muted); margin-top: 4px; }
.table-wrap { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th { background: var(--bg); padding: 12px 16px; text-align: left; font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }
td { padding: 12px 16px; border-top: 1px solid var(--border); }
tr:hover td { background: #f8fafc; }
.badge { display: inline-block; padding: 3px 10px; border-radius: 20px; font-size: 11px; font-weight: 600; text-transform: uppercase; }
.badge-success  { background: #dcfce7; color: #15803d; }
.badge-warning  { background: #fef9c3; color: #a16207; }
.badge-danger   { background: #fee2e2; color: #b91c1c; }
.badge-info     { background: #dbeafe; color: #1d4ed8; }
.badge-muted    { background: #f1f5f9; color: #475569; }

/* ── SKELETONS ── */
.skeleton { background: linear-gradient(90deg, #e2e8f0 25%, #f1f5f9 50%, #e2e8f0 75%); background-size: 400px; animation: shimmer 1.2s infinite; border-radius: var(--radius); height: 120px; }
.skeleton.tall { height: 200px; }
@keyframes shimmer { 0%{background-position:-400px 0} 100%{background-position:400px 0} }

/* ── UPLOAD FORM ── */
.upload-form { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; max-width: 720px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; color: var(--text); margin-bottom: 6px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; border: 1px solid var(--border); border-radius: 8px;
  padding: 10px 14px; font-size: 14px; color: var(--text);
  outline: none; transition: border-color .2s; font-family: inherit;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--primary); }
.form-group textarea { resize: vertical; min-height: 80px; }
.drop-zone {
  border: 2px dashed var(--border); border-radius: var(--radius);
  padding: 40px; text-align: center; cursor: pointer;
  transition: border-color .2s, background .2s;
}
.drop-zone:hover, .drop-zone.dragover { border-color: var(--primary); background: #eff6ff; }
.drop-zone .dz-icon { font-size: 36px; margin-bottom: 8px; }
.drop-zone p { color: var(--muted); font-size: 14px; }
.btn-primary {
  background: var(--primary); color: #fff;
  border: none; border-radius: var(--radius);
  padding: 12px 28px; font-size: 15px; font-weight: 600;
  cursor: pointer; transition: background .2s;
}
.btn-primary:hover { background: #0f2850; }
.btn-secondary {
  background: transparent; color: var(--primary);
  border: 1px solid var(--primary); border-radius: var(--radius);
  padding: 11px 24px; font-size: 15px; font-weight: 600;
  cursor: pointer; transition: all .2s;
}
.btn-secondary:hover { background: var(--primary); color: #fff; }

/* ── ALERTS ── */
.alert { padding: 14px 18px; border-radius: var(--radius); font-size: 14px; margin-bottom: 20px; }
.alert-success { background: #f0fdf4; border: 1px solid #bbf7d0; color: #15803d; }
.alert-error   { background: #fef2f2; border: 1px solid #fecaca; color: #b91c1c; }
.alert-info    { background: #eff6ff; border: 1px solid #bfdbfe; color: #1d4ed8; }

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  .doc-detail { grid-template-columns: 1fr; }
  .admin-layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .nav-links { gap: 12px; }
  .hero { padding: 48px 0; }
  .category-grid { grid-template-columns: repeat(2, 1fr); }
}