:root {
  --primary: #5b4fdb;
  --primary-dark: #453bb0;
  --bg: #f4f3ff;
  --card-bg: #ffffff;
  --text: #2b2b3a;
  --danger: #d9534f;
  --border: #e0dffa;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
}

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

button {
  cursor: pointer;
  font-family: inherit;
}

.btn-primary, .btn-secondary, .btn-danger {
  border: none;
  border-radius: 8px;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 600;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: #fff; color: var(--primary); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--bg); }
.btn-danger { background: var(--danger); color: #fff; }

/* ---------- Auth ---------- */
.page-auth {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}
.auth-box {
  background: var(--card-bg);
  padding: 40px;
  border-radius: 16px;
  box-shadow: 0 10px 40px rgba(91,79,219,.15);
  width: 340px;
  max-width: 90vw;
}
.auth-box h1 { margin: 0 0 4px; text-align: center; }
.auth-box .sub { text-align: center; color: #888; margin-bottom: 20px; font-size: 14px; }
.tabs { display: flex; margin-bottom: 16px; border-radius: 8px; overflow: hidden; border: 1px solid var(--border); }
.tab-btn { flex: 1; padding: 8px; background: #fff; border: none; }
.tab-btn.active { background: var(--primary); color: #fff; }
.auth-box label { display: block; margin-bottom: 12px; font-size: 13px; color: #666; }
.auth-box input, .auth-box select {
  width: 100%; padding: 10px; margin-top: 4px; border-radius: 8px;
  border: 1px solid var(--border); font-size: 14px;
}
.auth-box button[type=submit] { width: 100%; margin-top: 8px; }
.hidden { display: none !important; }
.msg-err { color: var(--danger); font-size: 13px; }
.msg-ok { color: #2c9c53; font-size: 14px; }

/* ---------- Topbar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #fff;
  padding: 10px 20px;
  border-bottom: 1px solid var(--border);
}
.topbar-title { font-weight: 700; font-size: 18px; }
.topbar-user { display: flex; align-items: center; gap: 16px; font-size: 14px; }
.topbar-back { font-weight: 600; }

/* ---------- Dashboard ---------- */
.dashboard { max-width: 1000px; margin: 0 auto; padding: 30px 20px; }
.dashboard-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.empty-state { color: #888; text-align: center; margin-top: 60px; }
.bd-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 20px; }
.bd-card {
  background: #fff; border-radius: 12px; overflow: hidden; position: relative;
  box-shadow: 0 4px 14px rgba(91,79,219,.1);
}
.bd-card-link { display: block; padding: 0; }
.bd-card-thumb {
  height: 100px; background: linear-gradient(135deg, #e7e5ff, #d3cffb);
  display: flex; align-items: center; justify-content: center; color: #7d74d8; font-size: 12px;
}
.bd-card-title { padding: 10px 12px 2px; font-weight: 600; color: var(--text); }
.bd-card-format { padding: 0 12px; font-size: 11px; color: #7d74d8; font-weight: 600; text-transform: uppercase; letter-spacing: .02em; }
.bd-card-date { padding: 4px 12px 12px; font-size: 12px; color: #999; }
.bd-card-comment { padding: 0 12px 12px; font-size: 12px; color: #a67c00; }
.btn-delete-bd {
  position: absolute; top: 8px; right: 8px; background: rgba(255,255,255,.9);
  border: none; border-radius: 6px; padding: 4px 8px;
}
.btn-export-bd {
  position: absolute; top: 8px; right: 40px; background: rgba(255,255,255,.9);
  border-radius: 6px; padding: 4px 8px; text-decoration: none; line-height: 1;
}
.btn-rename-bd {
  position: absolute; top: 8px; right: 72px; background: rgba(255,255,255,.9);
  border: none; border-radius: 6px; padding: 4px 8px; cursor: pointer;
}

/* ---------- Modal ---------- */
.modal {
  position: fixed; inset: 0; background: rgba(0,0,0,.4);
  display: flex; align-items: center; justify-content: center; z-index: 100;
}
.modal-content { background: #fff; padding: 24px; border-radius: 12px; width: 320px; }
.modal-content label { display: block; margin-bottom: 14px; font-size: 13px; color: #666; }
.modal-content input, .modal-content select {
  width: 100%; padding: 8px; margin-top: 4px; border-radius: 6px; border: 1px solid var(--border);
}
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 10px; }

/* ---------- Admin ---------- */
.admin-nav { display: flex; gap: 16px; padding: 16px 20px; background: #fff; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.admin-nav a { font-weight: 600; padding: 6px 10px; border-radius: 6px; }
.admin-nav a.active, .admin-nav a:hover { background: var(--bg); }
.admin-main { max-width: 900px; margin: 0 auto; padding: 24px 20px; }
.admin-table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; border-radius: 10px; }
table.admin-table { width: 100%; min-width: 480px; border-collapse: collapse; background: #fff; border-radius: 10px; overflow: hidden; }
table.admin-table th, table.admin-table td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--border); font-size: 14px; }
table.admin-table th { background: var(--bg); }
.form-inline { display: flex; gap: 10px; margin-bottom: 20px; flex-wrap: wrap; align-items: flex-end; }
.form-inline label { font-size: 13px; color: #666; }
.form-inline input, .form-inline select { display: block; padding: 8px; border-radius: 6px; border: 1px solid var(--border); margin-top: 4px; }
.pill { display: inline-block; background: var(--bg); color: var(--primary); padding: 2px 10px; border-radius: 20px; font-size: 12px; font-weight: 600; }

/* ---------- Responsive general ---------- */
@media (max-width: 640px) {
  .topbar { flex-wrap: wrap; row-gap: 8px; padding: 10px 14px; }
  .topbar-user { flex-wrap: wrap; gap: 10px; }
  .dashboard { padding: 20px 14px; }
  .dashboard-header { flex-wrap: wrap; gap: 10px; }
  .dashboard-header > div { width: 100%; display: flex; gap: 8px; }
  .dashboard-header button { flex: 1; }
  .bd-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 12px; }
  .admin-main { padding: 16px 14px; }
  .form-inline { gap: 8px; }
  .form-inline input, .form-inline select { width: 100%; }
  .modal-content { width: 90vw; }
}