:root {
  --bg: #f4f6f8;
  --surface: #ffffff;
  --ink: #121417;
  --muted: #5c6670;
  --line: #e3e8ee;
  --accent: #0f766e;
  --accent-ink: #ffffff;
  --danger: #b42318;
  --ok: #067647;
  --shadow: 0 10px 30px rgba(18, 20, 23, 0.06);
  --radius: 14px;
  --font: "Segoe UI", "IBM Plex Sans", "Noto Sans", sans-serif;
  --display: "Georgia", "Times New Roman", serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(15, 118, 110, 0.12), transparent 60%),
    radial-gradient(900px 400px at 100% 0%, rgba(18, 20, 23, 0.05), transparent 55%),
    var(--bg);
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }

.container { width: min(1100px, calc(100% - 2rem)); margin: 0 auto; }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 0;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(145deg, #0f766e, #134e4a);
  color: white;
  display: grid;
  place-items: center;
  font-size: 0.95rem;
}
.nav { display: flex; gap: 1rem; align-items: center; color: var(--muted); font-size: 0.92rem; }

.hero {
  padding: 4.5rem 0 3.5rem;
  text-align: center;
}
.hero h1 {
  font-family: var(--display);
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1.1;
  margin: 0 0 1rem;
  letter-spacing: -0.03em;
}
.hero p {
  max-width: 560px;
  margin: 0 auto 1.6rem;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.55;
}
.cta-row { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.7rem 1.2rem;
  cursor: pointer;
  transition: 0.15s ease;
}
.btn-primary { background: var(--ink); color: white; }
.btn-primary:hover { transform: translateY(-1px); }
.btn-ghost { background: transparent; border-color: var(--line); color: var(--ink); }
.btn-accent { background: var(--accent); color: var(--accent-ink); }
.btn-danger { background: #fff5f5; color: var(--danger); border-color: #f3d1d1; }
.btn-sm { padding: 0.4rem 0.8rem; font-size: 0.88rem; }

.section { padding: 2.5rem 0 3.5rem; }
.section h2 {
  font-family: var(--display);
  font-size: 1.8rem;
  margin: 0 0 0.5rem;
}
.section .lead { color: var(--muted); margin: 0 0 1.5rem; }

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
@media (max-width: 800px) {
  .grid-3 { grid-template-columns: 1fr; }
}

.feature {
  background: rgba(255,255,255,0.72);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem;
}
.feature h3 { margin: 0 0 0.4rem; font-size: 1.05rem; }
.feature p { margin: 0; color: var(--muted); line-height: 1.45; font-size: 0.95rem; }

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.5rem 0 2rem;
  color: var(--muted);
  font-size: 0.9rem;
}

/* Admin */
.admin-shell { display: grid; grid-template-columns: 230px 1fr; min-height: 100vh; }
.sidebar {
  background: #0f1418;
  color: #d7dee5;
  padding: 1.25rem;
}
.sidebar .brand { color: white; margin-bottom: 2rem; }
.sidebar nav { display: flex; flex-direction: column; gap: 0.35rem; }
.sidebar a {
  padding: 0.65rem 0.8rem;
  border-radius: 10px;
  color: #aeb8c2;
}
.sidebar a:hover, .sidebar a.active { background: rgba(255,255,255,0.08); color: white; }
.sidebar .meta { margin-top: auto; padding-top: 2rem; color: #7d8893; font-size: 0.85rem; }

.admin-main { padding: 1.5rem; }
.admin-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}
.admin-top h1 { margin: 0; font-size: 1.5rem; letter-spacing: -0.02em; }

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 1.25rem;
}
@media (max-width: 900px) {
  .admin-shell { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr; }
}
.stat {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  box-shadow: var(--shadow);
}
.stat .label { color: var(--muted); font-size: 0.85rem; }
.stat .value { font-size: 1.8rem; font-weight: 700; margin-top: 0.2rem; }

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.1rem;
  border-bottom: 1px solid var(--line);
}
.panel-body { padding: 1.1rem; }

table { width: 100%; border-collapse: collapse; }
th, td {
  text-align: left;
  padding: 0.75rem 0.9rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.94rem;
  vertical-align: middle;
}
th { color: var(--muted); font-weight: 600; font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.04em; }
tr:last-child td { border-bottom: none; }

.badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 0.15rem 0.55rem;
  font-size: 0.78rem;
  border: 1px solid var(--line);
  background: #f8fafb;
}
.badge-ok { color: var(--ok); border-color: #abefc6; background: #ecfdf3; }
.badge-off { color: var(--muted); }
.badge-proto { color: #175cd3; border-color: #b2ddff; background: #eff8ff; }

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 0.7rem;
  align-items: end;
}
.form-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.7rem;
  align-items: end;
}
@media (max-width: 800px) {
  .form-grid, .form-grid-2 { grid-template-columns: 1fr; }
}
.form-section {
  margin: 0.6rem 0 0;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
}
.check {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--muted);
  font-size: 0.88rem;
}
.check input { width: auto; }
.ping {
  display: inline-block;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  margin-right: 0.35rem;
  vertical-align: middle;
}
.ping-on { background: var(--ok); box-shadow: 0 0 0 3px rgba(6, 118, 71, 0.15); }
.ping-off { background: #98a2b3; }
.server-info {
  margin: 0 0 1rem;
  max-height: 120px;
  font-size: 0.8rem;
}
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.65rem 0.75rem;
  background: white;
  color: var(--ink);
  resize: vertical;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.84rem;
}
label { display: grid; gap: 0.35rem; font-size: 0.88rem; color: var(--muted); }
input, select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.65rem 0.75rem;
  background: white;
  color: var(--ink);
}
input:focus, select:focus, textarea:focus {
  outline: 2px solid rgba(15, 118, 110, 0.25);
  border-color: var(--accent);
}

.login-wrap {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1rem;
}
.login-card {
  width: min(420px, 100%);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1.5rem;
  box-shadow: var(--shadow);
}
.login-card h1 { margin: 0.4rem 0 0.2rem; font-size: 1.5rem; }
.login-card p { margin: 0 0 1.2rem; color: var(--muted); }
.stack { display: grid; gap: 0.8rem; }
.error {
  background: #fef3f2;
  color: var(--danger);
  border: 1px solid #fecdca;
  border-radius: 10px;
  padding: 0.7rem 0.8rem;
  margin-bottom: 0.8rem;
}
.flash {
  background: #ecfdf3;
  color: var(--ok);
  border: 1px solid #abefc6;
  border-radius: 10px;
  padding: 0.7rem 0.8rem;
  margin-bottom: 1rem;
}
.flash-error { background: #fef3f2; color: var(--danger); border-color: #fecdca; }

.actions { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.84rem;
  white-space: pre-wrap;
  background: #0f1418;
  color: #e8eef3;
  border-radius: 12px;
  padding: 1rem;
  overflow: auto;
}
.qr {
  width: 220px;
  height: 220px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: white;
  padding: 0.5rem;
}
.detail-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr;
  gap: 1rem;
}
@media (max-width: 900px) {
  .detail-grid { grid-template-columns: 1fr; }
}
.muted { color: var(--muted); }
.inline-form { display: inline; }