:root {
  --bg: #f7f7f8;
  --panel: #fff;
  --panel-soft: #f3f4f6;
  --text: #111827;
  --muted: #6b7280;
  --border: #e5e7eb;
  --primary: #111827;
  --primary-2: #374151;
  --danger: #dc2626;
  --ok: #16a34a;
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.1);
  --radius: 20px;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }

.topbar,
.admin-topbar {
  min-height: 78px;
  flex: 0 0 auto;
  background: rgba(247, 247, 248, 0.82);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 24px;
  min-width: 0;
  z-index: 10;
}

.viewer-topbar {
  height: 78px;
  min-height: 78px;
  padding: 0 17px;
  align-items: center;
}
.viewer-topbar .back-btn {
  width: 44px;
  height: 44px;
  padding: 0;
  align-self: center;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: translateY(5px);
}
.viewer-topbar .title-wrap {
  align-self: center;
  transform: translateY(5px);
}
.viewer-topbar .top-actions {
  align-self: center;
  align-items: center;
}
.viewer-topbar .top-actions .btn {
  margin: 0;
}

.admin-topbar {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  justify-content: space-between;
  margin-bottom: 18px;
  box-shadow: 0 2px 10px rgba(15, 23, 42, 0.035);
}
.back-btn {
  width: 42px;
  height: 42px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #fff;
  display: grid;
  place-items: center;
  box-shadow: 0 2px 10px rgba(15, 23, 42, 0.04);
  flex: 0 0 auto;
  font-size: 31px;
  line-height: 1;
  padding-bottom: 4px;
}
.back-btn:hover { background: #f9fafb; }
.title-wrap { min-width: 0; flex: 1 1 auto; overflow: hidden; max-width: 100%; }
.page-title,
.admin-topbar h1 {
  margin: 0;
  font-size: 22px;
  line-height: 1.15;
  font-weight: 560;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.page-subtitle,
.admin-topbar p,
.muted {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.2;
}
.viewer-topbar .page-subtitle {
  display: block !important;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  overflow: hidden !important;
  text-overflow: ellipsis !important;
  white-space: nowrap !important;
  overflow-wrap: normal !important;
  word-break: normal !important;
  hyphens: none !important;
}

.viewer-topbar .viewer-title-wrap,
.viewer-topbar .title-wrap {
  min-width: 0 !important;
  overflow: hidden !important;
  flex: 1 1 0 !important;
}
.viewer-topbar .file-name {
  display: block !important;
  width: 100% !important;
  min-width: 0 !important;
  overflow: hidden !important;
  text-overflow: ellipsis !important;
  white-space: nowrap !important;
  overflow-wrap: normal !important;
  word-break: normal !important;
  hyphens: none !important;
}

.top-actions,
.admin-actions { display: flex; gap: 8px; flex: 0 0 auto; flex-wrap: wrap; }
.btn {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  border-radius: 14px;
  padding: 10px 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  white-space: nowrap;
  font-weight: 560;
}
.btn:hover { background: #f9fafb; }
.btn.primary,
.btn:not(.secondary):not(.danger) { background: #111827; color: #fff; border-color: #111827; }
.btn.secondary { background: #fff; color: var(--text); }
.btn.danger { background: #fff; color: var(--danger); border-color: #fecaca; }
.btn.small { padding: 7px 10px; min-height: 34px; border-radius: 11px; font-size: 13px; }
.btn.full { width: 100%; }

.viewer-page { height: 100vh; display: flex; flex-direction: column; background: var(--bg); overflow: hidden; }
.viewer-content { flex: 1; min-height: 0; padding: 12px; }
.pdf-frame {
  display: block;
  width: 100%;
  height: 100%;
  border: 1px solid var(--border);
  border-radius: 0 !important;
  background: #111827;
  box-shadow: 0 2px 10px rgba(15, 23, 42, 0.035);
}
.admin-shell { max-width: 1180px; margin: 0 auto; padding: 24px; }
.admin-shell.narrow { max-width: 760px; }
.card,
.login-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: 0 2px 10px rgba(15, 23, 42, 0.035);
}
.login-page { min-height: 100vh; display: grid; place-items: center; padding: 20px; }
.login-card { width: 100%; max-width: 420px; }
.login-card h1 { margin: 0 0 6px; font-size: 24px; font-weight: 560; }
.form { display: grid; gap: 18px; }
label { display: grid; gap: 7px; font-weight: 560; }
input[type="text"], input[type="password"], input[type="file"] {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 11px 12px;
  background: #fff;
  color: var(--text);
}
input:focus { outline: 2px solid rgba(17, 24, 39, 0.16); outline-offset: 2px; }
small { color: var(--muted); }
.alert { padding: 12px 14px; border-radius: 14px; margin-bottom: 16px; font-weight: 560; }
.alert.error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }
.alert.success { background: #ecfdf3; color: var(--ok); border: 1px solid #bbf7d0; }
.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; }
th, td { text-align: left; padding: 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; font-weight: 700; }
code { background: var(--panel-soft); padding: 2px 6px; border-radius: 7px; }
.url-box, .danger-zone { background: #f9fafb; border: 1px solid var(--border); border-radius: 14px; padding: 12px; overflow-wrap: anywhere; }
.danger-zone { border-color: #fecaca; background: #fff5f5; }

@media (max-width: 700px) {
  .topbar, .admin-topbar { padding: 12px 14px; }
  .viewer-topbar { height: 78px; min-height: 78px; padding: 0 17px; align-items: center; }
  .viewer-topbar .title-wrap,
  .viewer-topbar .top-actions { align-self: center; }
  .admin-topbar { align-items: stretch; flex-direction: column; }
  .top-actions .btn { padding-left: 11px; padding-right: 11px; }
  .admin-shell { padding: 14px; }
  .viewer-content { padding: 8px; }
}


/* v3: mantener el encabezado del visor centrado verticalmente sin romper el ellipsis */
.viewer-topbar {
  display: flex;
  align-items: center !important;
}
.viewer-topbar .back-btn {
  align-self: center !important;
  transform: none !important;
  flex: 0 0 44px !important;
}
.viewer-topbar .viewer-title-wrap,
.viewer-topbar .title-wrap {
  align-self: stretch !important;
  transform: none !important;
  min-width: 0 !important;
  max-width: 100% !important;
  overflow: hidden !important;
  flex: 1 1 auto !important;
  display: flex !important;
  flex-direction: column !important;
  justify-content: center !important;
}
.viewer-topbar .top-actions {
  align-self: stretch !important;
  display: flex !important;
  align-items: center !important;
  flex: 0 0 auto !important;
}
.viewer-topbar .file-name {
  display: block !important;
  width: 100% !important;
  max-width: 100% !important;
  min-width: 0 !important;
  overflow: hidden !important;
  text-overflow: ellipsis !important;
  white-space: nowrap !important;
  overflow-wrap: normal !important;
  word-break: normal !important;
  hyphens: none !important;
}


/* v4: botón Volver rectangular, simétrico al de Descargar, sin alterar el centrado vertical */
.viewer-topbar {
  display: flex !important;
  align-items: center !important;
  gap: 12px !important;
  height: 78px;
  min-height: 78px;
}
.viewer-topbar .viewer-back-btn {
  flex: 0 0 auto !important;
  width: auto !important;
  height: auto !important;
  min-height: 42px !important;
  padding: 10px 14px !important;
  border-radius: 14px !important;
  border: 1px solid var(--border) !important;
  background: #fff !important;
  color: var(--text) !important;
  box-shadow: 0 2px 10px rgba(15, 23, 42, 0.04) !important;
  font-size: inherit !important;
  line-height: normal !important;
  font-weight: 560 !important;
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  align-self: center !important;
  transform: none !important;
}
.viewer-topbar .viewer-back-btn:hover {
  background: #f9fafb !important;
}
.viewer-topbar .viewer-title-wrap,
.viewer-topbar .title-wrap {
  flex: 1 1 auto !important;
  min-width: 0 !important;
  max-width: 100% !important;
  overflow: hidden !important;
  align-self: center !important;
  display: block !important;
  transform: none !important;
}
.viewer-topbar .top-actions {
  flex: 0 0 auto !important;
  display: flex !important;
  align-items: center !important;
  align-self: center !important;
}
.viewer-topbar .top-actions .btn {
  margin: 0 !important;
}
.viewer-topbar .file-name {
  display: block !important;
  width: 100% !important;
  max-width: 100% !important;
  min-width: 0 !important;
  overflow: hidden !important;
  text-overflow: ellipsis !important;
  white-space: nowrap !important;
  overflow-wrap: normal !important;
  word-break: normal !important;
  hyphens: none !important;
}

/* v5: tabla de administración más respirada y con columnas estables */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.table-wrap table {
  min-width: 1040px;
  table-layout: fixed;
}
th, td {
  padding: 16px 22px;
  vertical-align: middle;
}
.col-id { width: 64px; }
.col-document { width: 38%; min-width: 0; }
.col-public-id { width: 210px; }
.col-size { width: 130px; white-space: nowrap; }
.col-actions { width: 230px; }
.col-copy { width: 190px; }
.col-document strong,
.col-document small {
  display: block;
  max-width: 100%;
  overflow-wrap: anywhere;
}
.col-public-id code {
  display: inline-block;
  max-width: 100%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  vertical-align: middle;
}
.admin-button-stack {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.col-copy .admin-button-stack {
  align-items: flex-start;
  flex-direction: column;
}
.col-actions .btn,
.col-copy .btn {
  margin: 0;
}

@media (max-width: 700px) {
  th, td { padding: 14px 16px; }
  .table-wrap table { min-width: 980px; }
}