/* ============================================================
   PHVB - Hệ thống Quản lý Văn bản
   Style hiện đại, flat, tone xanh VinFast
   ============================================================ */
:root {
  --vf-primary:      #00A19A;   /* xanh teal VinFast */
  --vf-primary-dark: #007D77;
  --vf-primary-600:  #008C86;
  --vf-navy:         #0B2A3B;   /* xanh đậm header */
  --vf-navy-2:       #0F3A50;
  --vf-accent:       #00C2B8;
  --vf-bg:           #f4f6f8;
  --vf-surface:      #ffffff;
  --vf-border:       #e6e9ee;
  --vf-text:         #1f2933;
  --vf-muted:        #6b7684;
  --vf-danger:       #e53935;
  --vf-warning:      #f39c12;
  --vf-success:      #2e7d32;
  --radius:          12px;
  --radius-sm:       8px;
  --shadow:          0 1px 3px rgba(16,24,40,.06), 0 1px 2px rgba(16,24,40,.04);
  --shadow-md:       0 4px 16px rgba(16,24,40,.08);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, 'Helvetica Neue', Arial, sans-serif;
  background: var(--vf-bg);
  color: var(--vf-text);
  font-size: 14.5px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--vf-primary-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- Layout ---------- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ---------- Topbar ---------- */
.topbar {
  background: linear-gradient(100deg, var(--vf-navy) 0%, var(--vf-navy-2) 55%, var(--vf-primary-dark) 130%);
  color: #fff;
  box-shadow: var(--shadow-md);
  position: sticky; top: 0; z-index: 50;
}
.topbar-inner {
  display: flex; align-items: center; gap: 16px;
  height: 62px;
}
.brand { display: flex; align-items: center; gap: 12px; color: #fff; }
.brand:hover { text-decoration: none; }
.brand .logo {
  width: 40px; height: 40px; border-radius: 10px;
  background: linear-gradient(135deg, var(--vf-accent), var(--vf-primary));
  display: grid; place-items: center;
  font-weight: 800; font-size: 18px; color: #04252a;
  box-shadow: 0 2px 8px rgba(0,194,184,.4);
}
.brand .brand-text b { font-size: 16px; letter-spacing: .3px; display: block; line-height: 1.2; }
.brand .brand-text span { font-size: 11.5px; opacity: .75; }
.topbar .spacer { flex: 1; }

.btn-login {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.25);
  color: #fff; padding: 8px 16px; border-radius: 999px;
  font-weight: 600; font-size: 13.5px;
  transition: .18s;
}
.btn-login:hover { background: rgba(255,255,255,.22); text-decoration: none; }
.user-chip {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,.12); border-radius: 999px;
  padding: 5px 6px 5px 14px; font-size: 13px; color: #fff;
}
.user-chip .avatar {
  width: 30px; height: 30px; border-radius: 50%;
  background: var(--vf-accent); color: #04252a;
  display: grid; place-items: center; font-weight: 700; font-size: 13px;
}

/* ---------- Hero (index) ---------- */
.hero {
  background: linear-gradient(120deg, var(--vf-navy) 0%, var(--vf-primary-dark) 120%);
  color: #fff; padding: 34px 0 90px;
}
.hero h1 { margin: 0 0 6px; font-size: 26px; font-weight: 800; letter-spacing: .2px; }
.hero p { margin: 0; opacity: .8; font-size: 14.5px; }
.hero-stats { display: flex; gap: 28px; margin-top: 20px; flex-wrap: wrap; }
.hero-stat b { font-size: 24px; display: block; }
.hero-stat span { font-size: 12.5px; opacity: .75; }

/* Search box nổi trên hero */
.search-wrap { margin-top: -56px; margin-bottom: 22px; position: relative; z-index: 5; }
.search-card {
  background: var(--vf-surface); border-radius: var(--radius);
  box-shadow: var(--shadow-md); padding: 16px; border: 1px solid var(--vf-border);
}
.search-row { display: flex; gap: 12px; flex-wrap: wrap; }
.search-row .field { flex: 1; min-width: 200px; }
.search-input {
  width: 100%; padding: 12px 14px 12px 40px; border: 1px solid var(--vf-border);
  border-radius: var(--radius-sm); font-size: 14.5px; background: #fbfcfd;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='18' height='18' fill='none' stroke='%236b7684' stroke-width='2' viewBox='0 0 24 24'%3E%3Ccircle cx='11' cy='11' r='7'/%3E%3Cpath d='m21 21-4.3-4.3'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: 13px center;
}
.search-input:focus, select:focus, input:focus, textarea:focus {
  outline: none; border-color: var(--vf-primary); background: #fff;
  box-shadow: 0 0 0 3px rgba(0,161,154,.12);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px; justify-content: center;
  padding: 10px 18px; border-radius: var(--radius-sm); border: 1px solid transparent;
  font-weight: 600; font-size: 14px; cursor: pointer; transition: .16s; white-space: nowrap;
}
.btn-primary { background: var(--vf-primary); color: #fff; }
.btn-primary:hover { background: var(--vf-primary-dark); text-decoration: none; }
.btn-outline { background: #fff; border-color: var(--vf-border); color: var(--vf-text); }
.btn-outline:hover { border-color: var(--vf-primary); color: var(--vf-primary-dark); text-decoration: none; }
.btn-danger { background: #fff; border-color: #f3c6c5; color: var(--vf-danger); }
.btn-danger:hover { background: var(--vf-danger); color: #fff; text-decoration: none; }
.btn-ghost { background: transparent; color: var(--vf-muted); }
.btn-ghost:hover { color: var(--vf-primary-dark); text-decoration: none; }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-block { width: 100%; }

/* ---------- Cards / Panels ---------- */
.panel {
  background: var(--vf-surface); border: 1px solid var(--vf-border);
  border-radius: var(--radius); box-shadow: var(--shadow); margin-bottom: 20px;
}
.panel-head {
  display: flex; align-items: center; gap: 12px;
  padding: 16px 20px; border-bottom: 1px solid var(--vf-border);
}
.panel-head h2 { margin: 0; font-size: 16px; font-weight: 700; }
.panel-head .spacer { flex: 1; }
.panel-body { padding: 20px; }

/* ---------- Flat Table ---------- */
.table-wrap { overflow-x: auto; }
table.flat { width: 100%; border-collapse: collapse; font-size: 14px; }
table.flat thead th {
  text-align: left; font-weight: 600; color: var(--vf-muted);
  font-size: 12px; text-transform: uppercase; letter-spacing: .4px;
  padding: 12px 16px; border-bottom: 1px solid var(--vf-border);
  background: #fbfcfd; position: sticky; top: 0;
}
table.flat tbody td { padding: 13px 16px; border-bottom: 1px solid #f0f2f5; vertical-align: middle; }
table.flat tbody tr { transition: background .12s; }
table.flat tbody tr:hover { background: #f7fbfb; }
table.flat tbody tr:last-child td { border-bottom: none; }
.doc-title { font-weight: 600; color: var(--vf-text); display: flex; align-items: center; gap: 10px; }
.doc-title a { color: var(--vf-text); }
.doc-title a:hover { color: var(--vf-primary-dark); }
.doc-meta { color: var(--vf-muted); font-size: 12.5px; margin-top: 2px; }
.col-actions { text-align: right; white-space: nowrap; }
.col-actions .btn { margin-left: 4px; }

/* Badge loại file */
.file-badge {
  color: #fff; font-size: 10.5px; font-weight: 700; letter-spacing: .3px;
  padding: 3px 7px; border-radius: 5px; display: inline-block; min-width: 40px; text-align: center;
}
.cat-chip {
  display: inline-block; padding: 3px 10px; border-radius: 999px;
  background: #e8f5f4; color: var(--vf-primary-dark); font-size: 12px; font-weight: 600;
}
.ver-chip {
  display: inline-block; padding: 2px 8px; border-radius: 6px;
  background: #eef1f5; color: var(--vf-muted); font-size: 12px; font-weight: 600;
}

/* Trạng thái */
.status { display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.st-published { background: #e6f4ea; color: #1e7d34; }
.st-draft     { background: #fff4e0; color: #b8730b; }
.st-archived  { background: #f0f2f5; color: #6b7684; }

/* ---------- Forms ---------- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-group { margin-bottom: 16px; }
.form-group.full { grid-column: 1 / -1; }
label.lbl { display: block; font-weight: 600; margin-bottom: 6px; font-size: 13.5px; }
label.lbl .req { color: var(--vf-danger); }
.form-control {
  width: 100%; padding: 10px 12px; border: 1px solid var(--vf-border);
  border-radius: var(--radius-sm); font-size: 14px; background: #fbfcfd; font-family: inherit;
}
textarea.form-control { resize: vertical; min-height: 90px; }
.help-text { color: var(--vf-muted); font-size: 12.5px; margin-top: 5px; }

/* Dropzone */
.dropzone {
  border: 2px dashed #cfd8e3; border-radius: var(--radius);
  padding: 30px; text-align: center; background: #fbfcfd; cursor: pointer; transition: .16s;
}
.dropzone:hover, .dropzone.drag { border-color: var(--vf-primary); background: #f2fbfa; }
.dropzone .dz-icon { font-size: 34px; }
.dropzone .dz-file { margin-top: 10px; font-weight: 600; color: var(--vf-primary-dark); }

/* ---------- Alerts ---------- */
.alert { padding: 13px 16px; border-radius: var(--radius-sm); margin-bottom: 18px; font-size: 14px; border: 1px solid; }
.alert-success { background: #e9f7ee; border-color: #bfe6cb; color: #1e7d34; }
.alert-danger  { background: #fdecea; border-color: #f5c6c3; color: #b71c1c; }
.alert-info    { background: #e7f3fb; border-color: #bfdff5; color: #0b5a8a; }
.alert-warning { background: #fff6e5; border-color: #ffe0a6; color: #9a6200; }

/* ---------- Auth (login) ---------- */
.auth-wrap { min-height: 100vh; display: grid; place-items: center; padding: 24px;
  background: linear-gradient(120deg, var(--vf-navy) 0%, var(--vf-primary-dark) 130%); }
.auth-card { background: #fff; width: 100%; max-width: 400px; border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0,0,0,.25); padding: 34px 30px; }
.auth-card .logo-lg {
  width: 56px; height: 56px; border-radius: 14px; margin: 0 auto 16px;
  background: linear-gradient(135deg, var(--vf-accent), var(--vf-primary));
  display: grid; place-items: center; font-weight: 800; font-size: 24px; color: #04252a;
}
.auth-card h1 { text-align: center; font-size: 20px; margin: 0 0 4px; }
.auth-card .sub { text-align: center; color: var(--vf-muted); font-size: 13px; margin-bottom: 24px; }

/* ---------- Admin sidebar layout ---------- */
.admin-layout { display: flex; min-height: calc(100vh - 62px); }
.sidebar {
  width: 240px; background: var(--vf-surface); border-right: 1px solid var(--vf-border);
  padding: 18px 12px; flex-shrink: 0;
}
.sidebar .nav-title { font-size: 11px; text-transform: uppercase; letter-spacing: .5px;
  color: var(--vf-muted); padding: 10px 12px 6px; font-weight: 700; }
.sidebar a.nav-item {
  display: flex; align-items: center; gap: 11px; padding: 10px 12px; border-radius: var(--radius-sm);
  color: var(--vf-text); font-weight: 500; margin-bottom: 2px; font-size: 14px;
}
.sidebar a.nav-item:hover { background: #f2fbfa; text-decoration: none; }
.sidebar a.nav-item.active { background: var(--vf-primary); color: #fff; }
.sidebar a.nav-item svg { width: 18px; height: 18px; flex-shrink: 0; }
.admin-main { flex: 1; padding: 26px; min-width: 0; }
.page-title { display: flex; align-items: center; gap: 14px; margin-bottom: 20px; }
.page-title h1 { margin: 0; font-size: 22px; font-weight: 800; }
.page-title .spacer { flex: 1; }

/* Stat cards */
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 22px; }
.stat-card { background: var(--vf-surface); border: 1px solid var(--vf-border); border-radius: var(--radius);
  padding: 18px; box-shadow: var(--shadow); }
.stat-card .stat-ic { width: 42px; height: 42px; border-radius: 11px; display: grid; place-items: center;
  margin-bottom: 12px; }
.stat-card b { font-size: 26px; display: block; line-height: 1.1; }
.stat-card span { color: var(--vf-muted); font-size: 13px; }

/* ---------- Viewer (view.php) ---------- */
.viewer-grid { display: grid; grid-template-columns: 1fr 320px; gap: 20px; align-items: start; }
.viewer-frame { background: #fff; border: 1px solid var(--vf-border); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow); }
.viewer-frame iframe, .viewer-frame embed { width: 100%; height: 78vh; border: 0; display: block; }
.viewer-empty { padding: 60px 30px; text-align: center; color: var(--vf-muted); }
.info-list { list-style: none; margin: 0; padding: 0; }
.info-list li { display: flex; justify-content: space-between; gap: 12px; padding: 10px 0;
  border-bottom: 1px solid #f0f2f5; font-size: 13.5px; }
.info-list li:last-child { border-bottom: none; }
.info-list .k { color: var(--vf-muted); }
.info-list .v { font-weight: 600; text-align: right; }

/* Version timeline */
.ver-item { display: flex; gap: 12px; padding: 12px 0; border-bottom: 1px solid #f0f2f5; }
.ver-item:last-child { border-bottom: none; }
.ver-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--vf-border); margin-top: 6px; flex-shrink: 0; }
.ver-item.current .ver-dot { background: var(--vf-primary); box-shadow: 0 0 0 4px rgba(0,161,154,.15); }
.ver-item .ver-label { font-weight: 700; }
.ver-item .ver-note { color: var(--vf-muted); font-size: 12.5px; }

/* Empty state */
.empty { text-align: center; padding: 60px 20px; color: var(--vf-muted); }
.empty .emoji { font-size: 46px; margin-bottom: 10px; }

/* Pagination */
.pagination { display: flex; gap: 6px; justify-content: center; padding: 18px 0; }
.pagination a, .pagination span {
  min-width: 36px; height: 36px; padding: 0 10px; display: grid; place-items: center;
  border: 1px solid var(--vf-border); border-radius: var(--radius-sm); font-size: 14px; color: var(--vf-text);
}
.pagination a:hover { border-color: var(--vf-primary); text-decoration: none; }
.pagination .active { background: var(--vf-primary); color: #fff; border-color: var(--vf-primary); }

/* Footer */
.footer { text-align: center; color: var(--vf-muted); font-size: 13px; padding: 30px 0; }

/* Utilities */
.muted { color: var(--vf-muted); }
.text-right { text-align: right; }
.mb-0 { margin-bottom: 0; }
.mt-2 { margin-top: 16px; }
.flex { display: flex; align-items: center; gap: 10px; }
.hide { display: none; }

/* Responsive */
@media (max-width: 900px) {
  .viewer-grid { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .admin-layout { flex-direction: column; }
  .sidebar { width: 100%; display: flex; overflow-x: auto; gap: 4px; border-right: none;
    border-bottom: 1px solid var(--vf-border); }
  .sidebar .nav-title { display: none; }
  .sidebar a.nav-item { white-space: nowrap; }
}
@media (max-width: 560px) {
  .stat-grid { grid-template-columns: 1fr; }
  .brand .brand-text span { display: none; }
  .hero h1 { font-size: 21px; }
  table.flat thead { display: none; }
  table.flat tbody td { padding: 8px 14px; }
  table.flat tbody tr { display: block; padding: 8px 0; border-bottom: 1px solid var(--vf-border); }
  .col-actions { text-align: left; }
}