:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --text: #1f2937;
  --muted: #667085;
  --line: #e5e7eb;
  --primary: #0f766e;
  --primary-dark: #115e59;
  --danger: #b42318;
  --soft: #eef6f5;
  --shadow: 0 10px 30px rgba(16, 24, 40, 0.07);
}

* { box-sizing: border-box; }
html { font-size: 16px; }
body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: Tahoma, Arial, sans-serif;
  line-height: 1.7;
}
a { color: var(--primary); text-decoration: none; }
h1, h2, p { margin-top: 0; }
h1 { font-size: 1.7rem; margin-bottom: 0.35rem; }
h2 { font-size: 1.1rem; margin-bottom: 1rem; }
p { color: var(--muted); }

input, button, .button {
  font: inherit;
  border-radius: 8px;
}
input {
  width: 100%;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  padding: 0.75rem 0.85rem;
  margin-top: 0.35rem;
}
input:focus {
  outline: 2px solid rgba(15, 118, 110, 0.18);
  border-color: var(--primary);
}
button, .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border: 0;
  padding: 0.65rem 1rem;
  cursor: pointer;
}
.primary {
  background: var(--primary);
  color: #fff;
}
.primary:hover { background: var(--primary-dark); color: #fff; }
.secondary {
  background: #eef2f7;
  color: var(--text);
}
.danger {
  background: #fee4e2;
  color: var(--danger);
}
.danger-text {
  min-height: auto;
  padding: 0;
  background: transparent;
  color: var(--danger);
}

.admin-shell {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: 100vh;
}
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  background: #ffffff;
  border-left: 1px solid var(--line);
  padding: 1.25rem;
}
.brand {
  display: block;
  color: var(--text);
  font-weight: 700;
  margin-bottom: 1.25rem;
}
.sidebar nav {
  display: grid;
  gap: 0.35rem;
}
.sidebar nav a,
.link-button {
  width: 100%;
  justify-content: flex-start;
  background: transparent;
  color: var(--muted);
  padding: 0.65rem 0;
}
.sidebar nav a:hover,
.link-button:hover { color: var(--primary); }
.content {
  width: min(1180px, 100%);
  padding: 2rem;
}
.page-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-start;
  margin-bottom: 1.25rem;
}
.panel,
.metric,
.login-box,
.download-box {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}
.panel { padding: 1.25rem; margin-bottom: 1rem; }
.grid { display: grid; gap: 1rem; }
.stats-grid { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); margin-bottom: 1rem; }
.two-col { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.metric { padding: 1rem; }
.metric span {
  display: block;
  color: var(--muted);
  font-size: 0.9rem;
}
.metric strong {
  display: block;
  font-size: 1.7rem;
  margin-top: 0.25rem;
}
.table-wrap { overflow-x: auto; }
table {
  width: 100%;
  border-collapse: collapse;
  min-width: 620px;
}
th, td {
  text-align: right;
  border-bottom: 1px solid var(--line);
  padding: 0.75rem;
  vertical-align: top;
}
th {
  color: var(--muted);
  font-weight: 600;
  background: #fafafa;
}
.actions {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
}
.actions form { margin: 0; }
.copy-input { min-width: 280px; }
.ua {
  max-width: 340px;
  word-break: break-word;
}
.messages { margin-bottom: 1rem; }
.message {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  margin-bottom: 0.5rem;
  background: var(--soft);
  border: 1px solid #b7dfd9;
}
.message.error {
  background: #fff1f0;
  border-color: #fecdca;
  color: var(--danger);
}
.form-stack {
  display: grid;
  gap: 1rem;
}
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 1rem;
}
input[type="color"] {
  height: 46px;
  padding: 0.25rem;
}
.check-row {
  display: flex;
  gap: 0.6rem;
  align-items: center;
}
.check-row input {
  width: auto;
  margin: 0;
}
.section-title,
.form-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.button-rows {
  display: grid;
  gap: 0.75rem;
}
.button-row {
  display: grid;
  grid-template-columns: 1fr 2fr auto;
  gap: 0.75rem;
  align-items: end;
  padding: 0.85rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfd;
}
.login-page,
.download-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1rem;
}
.login-box {
  width: min(420px, 100%);
  padding: 1.5rem;
  display: grid;
  gap: 1rem;
}
.download-page {
  color: var(--landing-text);
  background:
    radial-gradient(circle at top, rgba(15, 118, 110, 0.12), transparent 34rem),
    var(--landing-bg, #f6f7f9);
}
.download-box {
  width: min(520px, 100%);
  padding: 2rem;
  text-align: center;
  background: var(--landing-card, #fff);
  border-radius: var(--download-card-radius, 14px);
}
.download-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 0.25rem 0.75rem;
  margin-bottom: 1rem;
  border-radius: 999px;
  color: var(--primary);
  background: rgba(15, 118, 110, 0.1);
  font-size: 0.85rem;
  font-weight: 700;
  display: none;
}
.download-box h1 {
  color: var(--title-color, #111827);
  font-size: min(var(--title-size, 30px), 12vw);
  margin-top: var(--title-mt, 0);
  margin-bottom: var(--title-mb, 24px);
  padding-top: var(--title-pt, 0);
  padding-bottom: var(--title-pb, 0);
  overflow-wrap: anywhere;
}
.download-actions {
  display: grid;
  gap: 0.75rem;
}
.download-button {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  border-radius: var(--download-button-radius, 10px);
  color: var(--download-button-text, #fff);
  background: var(--download-button-bg, #0f766e);
  font-weight: 700;
  box-shadow: 0 8px 18px rgba(15, 118, 110, 0.18);
}
.download-button:hover {
  background: var(--download-button-hover, #115e59);
  color: var(--download-button-text, #fff);
  transform: translateY(-1px);
}
.pagination {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
  color: var(--muted);
}

@media (max-width: 780px) {
  .admin-shell { grid-template-columns: 1fr; }
  .sidebar {
    position: static;
    height: auto;
    border-left: 0;
    border-bottom: 1px solid var(--line);
  }
  .sidebar nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .content { padding: 1rem; }
  .page-head { display: grid; }
  .two-col { grid-template-columns: 1fr; }
  .button-row { grid-template-columns: 1fr; }
}