:root {
  --rail: #131a2e;
  --rail-active: #34d399;
  --bg: #f4f6fb;
  --card: #ffffff;
  --ink: #1e2438;
  --muted: #6b7391;
  --line: #e3e7f2;
  --accent: #4f6df5;
  --ok: #1fa76a;
  --warn: #d97706;
  --err: #d64545;
  --radius: 12px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: "Segoe UI", "Helvetica Neue", Arial, "PingFang SC", sans-serif;
  background: var(--bg);
  color: var(--ink);
  font-size: 14px;
  line-height: 1.5;
}

.layout { display: flex; min-height: 100vh; }

/* ---- left rail ---- */
.rail {
  width: 240px;
  flex: none;
  background: var(--rail);
  color: #cdd4ea;
  padding: 22px 0 0;
  display: flex;
  flex-direction: column;
}
.brand {
  padding: 0 22px 20px;
  border-bottom: 1px solid #232c47;
}
.brand .name { font-size: 17px; font-weight: 600; color: #fff; letter-spacing: .3px; }
.brand .sub { font-size: 11px; color: #7d8ab3; margin-top: 2px; }
.nav { margin-top: 14px; display: flex; flex-direction: column; }
.nav a {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 22px;
  color: #b9c2df; text-decoration: none; font-size: 13.5px;
  border-left: 3px solid transparent;
}
.nav a:hover { color: #fff; background: #1b2440; }
.nav a.active {
  color: #fff; background: #1b2440;
  border-left-color: var(--rail-active);
}
.nav .tag {
  margin-left: auto; font-size: 10px;
  background: #25446b; color: #9cc3f5;
  padding: 2px 7px; border-radius: 10px;
}
.rail-footer {
  margin-top: auto;
  padding: 16px 22px;
  border-top: 1px solid #232c47;
  font-size: 11.5px; color: #7d8ab3;
}
.rail-footer .client-badge {
  display: inline-block;
  background: #24365c; color: #86e3b8;
  padding: 3px 9px; border-radius: 8px;
  font-size: 12px; margin-bottom: 6px;
}

/* ---- main ---- */
.main { flex: 1; padding: 28px 34px; max-width: 1180px; }
.page-head { margin-bottom: 20px; }
.page-head h1 { font-size: 21px; font-weight: 600; }
.page-head p { color: var(--muted); margin-top: 4px; font-size: 13px; }

.topbar {
  display: flex; justify-content: flex-end; align-items: center; gap: 14px;
  margin-bottom: 18px;
}
.who { font-size: 12.5px; color: var(--muted); }
.who b { color: var(--ink); }

button, .btn {
  font: inherit; font-size: 13.5px;
  border: 1px solid var(--line);
  background: #fff; color: var(--ink);
  padding: 8px 16px; border-radius: 8px;
  cursor: pointer; text-decoration: none;
  transition: .15s;
}
button:hover, .btn:hover { border-color: var(--accent); color: var(--accent); }
button.primary {
  background: var(--accent); border-color: var(--accent); color: #fff;
}
button.primary:hover { background: #4059d8; }
button.danger { border-color: #f2c1c1; color: var(--err); }
button:disabled { opacity: .5; cursor: not-allowed; }
button.tiny { padding: 5px 11px; font-size: 12.5px; border-radius: 6px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
  margin-bottom: 18px;
}
.card h2 {
  font-size: 15px; font-weight: 600;
  margin-bottom: 14px;
  display: flex; align-items: center; gap: 10px;
}
.card h2 .perm-tag {
  font-size: 10.5px; font-weight: 500;
  font-family: Consolas, monospace;
  background: #eef2ff; color: #4a5cd8;
  padding: 3px 9px; border-radius: 8px;
}

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); font-size: 13.5px; }
th { color: var(--muted); font-weight: 500; font-size: 12px; text-transform: uppercase; letter-spacing: .5px; }
td .mono { font-family: Consolas, monospace; font-size: 12.5px; color: var(--muted); }
tr:hover td { background: #f9fafd; }

.badge {
  display: inline-block; padding: 3px 10px;
  border-radius: 10px; font-size: 12px; font-weight: 500;
}
.badge.active { background: #e6f7ef; color: var(--ok); }
.badge.paused { background: #fdf3e7; color: var(--warn); }

.notice {
  padding: 12px 16px; border-radius: 10px;
  font-size: 13px; margin-bottom: 16px;
  display: none;
}
.notice.show { display: block; }
.notice.err { background: #fdecec; color: var(--err); border: 1px solid #f6cfcf; }
.notice.ok { background: #e6f7ef; color: var(--ok); border: 1px solid #c4ecd8; }

.loading { color: var(--muted); font-size: 13px; padding: 16px 0; }

/* form */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 18px; }
.field label { display: block; font-size: 12.5px; color: var(--muted); margin-bottom: 5px; }
.field input, .field textarea, .field select {
  width: 100%; font: inherit; font-size: 13.5px;
  padding: 8px 11px; border: 1px solid var(--line); border-radius: 8px;
}
.field input:focus, .field textarea:focus { outline: none; border-color: var(--accent); }
.field .hint { font-size: 11px; color: var(--muted); margin-top: 3px; }
.form-actions { grid-column: span 2; margin-top: 8px; display: flex; justify-content: flex-end; gap: 10px; }

/* landing page */
.land { display: flex; min-height: 100vh; }
.land-left {
  flex: 1; background: var(--rail); color: #dfe4f5;
  display: flex; flex-direction: column; justify-content: center;
  padding: 60px 70px;
}
.land-left h1 { font-size: 30px; color: #fff; font-weight: 600; }
.land-left p { margin-top: 12px; color: #9098c0; max-width: 420px; }
.land-right {
  flex: 1; display: flex; align-items: center; justify-content: center;
  flex-direction: column; gap: 16px;
}
.fb-btn {
  display: inline-flex; align-items: center; gap: 10px;
  background: #1877f2; color: #fff; font-weight: 600; font-size: 15px;
  border: none; border-radius: 9px; padding: 13px 30px;
  text-decoration: none;
}
.fb-btn:hover { background: #0f62d0; color: #fff; }
.foot-links { font-size: 12.5px; color: var(--muted); }
.foot-links a { color: var(--muted); }

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.tabs a {
  padding: 6px 14px; border-radius: 8px; text-decoration: none;
  font-size: 13px; color: var(--muted); border: 1px solid var(--line);
}
.tabs a.active { background: #1b2547; color: #fff; border-color: #1b2547; }
.badge.verifying { background: #fdf3e7; color: var(--warn); }
td button.tiny + a.btn.tiny { margin-left: 6px; }