:root {
  /* light, flat theme */
  --bg: #f7f8fa;
  --bg-2: #eef1f5;
  --panel: #ffffff;
  --panel-2: #f3f5f8;
  --border: #e0e4ec;
  --border-soft: #e9edf3;
  --text: #1b2230;
  --muted: #6b7382;
  --accent: #4f46e5;
  --accent-2: #7c3aed;
  --green: #16a34a;
  --danger: #e0413f;
  --warn: #d97706;
  --ring: rgba(79, 70, 229, 0.22);
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, 'PingFang SC', sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}
.hidden { display: none !important; }
.muted { color: var(--muted); font-weight: 400; font-size: 13px; }
.error { color: var(--danger); min-height: 18px; margin: 8px 0 0; }
h2 { margin: 0; font-size: 20px; font-weight: 700; letter-spacing: -0.01em; }
h3 { margin: 0 0 12px; font-size: 15px; }
a { color: var(--accent); }

/* ===== login ===== */
.login-screen { display: flex; align-items: center; justify-content: center; min-height: 100vh; padding: 20px; }
.login-card {
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 40px 34px; width: 380px; text-align: center;
}
.login-logo, .brand-logo {
  width: 48px; height: 48px; margin: 0 auto;
  display: grid; place-items: center; font-weight: 800; letter-spacing: -0.02em;
  color: #fff; background: var(--accent);
}
.login-card h1 { margin: 18px 0 4px; font-size: 22px; }
.login-card input { width: 100%; margin: 20px 0 14px; }
.login-card button { width: 100%; }

/* ===== app shell ===== */
.app { display: grid; grid-template-columns: 240px 1fr; min-height: 100vh; }
.sidebar {
  display: flex; flex-direction: column;
  background: var(--panel);
  border-right: 1px solid var(--border);
  padding: 18px 12px;
  position: sticky; top: 0; height: 100vh;
}
.sidebar-brand { display: flex; align-items: center; gap: 12px; padding: 6px 8px 20px; border-bottom: 1px solid var(--border-soft); margin-bottom: 12px; }
.brand-logo { width: 38px; height: 38px; font-size: 15px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-text strong { font-size: 14px; }
.brand-text .muted { font-size: 11px; }

.nav { display: flex; flex-direction: column; gap: 2px; flex: 1; }
.nav-item {
  display: flex; align-items: center; gap: 11px;
  background: transparent; border: none; color: var(--muted);
  padding: 10px 12px; cursor: pointer; font-size: 14px;
  text-align: left; width: 100%; font-weight: 500;
  border-left: 2px solid transparent;
}
.nav-item .ni-dot { width: 6px; height: 6px; background: currentColor; opacity: 0.45; }
.nav-item:hover { color: var(--text); background: var(--panel-2); }
.nav-item.active {
  color: var(--accent); background: var(--panel-2);
  border-left: 2px solid var(--accent);
}
.nav-item.active .ni-dot { opacity: 1; background: var(--accent); }
.sidebar-foot { padding-top: 12px; border-top: 1px solid var(--border-soft); }
.block { width: 100%; }

.main { padding: 26px 30px; max-width: 1280px; }

/* ===== page head ===== */
.page-head {
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: 16px; margin-bottom: 20px; padding-bottom: 16px; border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.page-head .muted { margin-top: 4px; }
.page-actions { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }

/* ===== controls ===== */
input, select {
  background: var(--panel); border: 1px solid var(--border); color: var(--text);
  padding: 9px 11px; font-size: 14px; outline: none; transition: border-color 0.15s;
}
input::placeholder { color: #9aa3b2; }
input:focus, select:focus { border-color: var(--accent); }
button {
  background: var(--panel); color: var(--text); border: 1px solid var(--border); padding: 9px 15px;
  cursor: pointer; font-size: 14px; font-weight: 600; transition: all 0.15s;
}
button:hover { border-color: #c7cedb; background: var(--panel-2); }
.btn-primary { background: var(--accent); color: #fff; border: 1px solid var(--accent); }
.btn-primary:hover { background: #4339cf; border-color: #4339cf; }
button.ghost { background: var(--panel); border: 1px solid var(--border); color: var(--text); }
button.ghost:hover { background: var(--panel-2); }
button.danger { background: #fff; border-color: rgba(224,65,63,0.4); color: var(--danger); }
button.danger:hover { background: rgba(224,65,63,0.08); }
button.sm { padding: 5px 10px; font-size: 12px; }
button.icon { padding: 0 8px; font-size: 22px; line-height: 1; background: transparent; border: none; color: var(--muted); }
button.icon:hover { color: var(--text); background: transparent; }

/* ===== panels ===== */
.panel { background: var(--panel); border: 1px solid var(--border); overflow: hidden; }
.panel-head { padding: 14px 18px; font-weight: 700; font-size: 14px; border-bottom: 1px solid var(--border-soft); }

/* ===== cards ===== */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 14px; margin-bottom: 22px; }
.card {
  position: relative; background: var(--panel);
  border: 1px solid var(--border); border-left: 3px solid var(--accent);
  padding: 18px 20px; overflow: hidden;
}
.card .label { color: var(--muted); font-size: 13px; }
.card .value { font-size: 28px; font-weight: 800; margin-top: 8px; letter-spacing: -0.02em; }
.card .value.green { color: var(--green); }
.card .value.blue { color: var(--accent); }

/* ===== tables ===== */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--border-soft); white-space: nowrap; }
th { color: var(--muted); font-weight: 600; font-size: 11px; letter-spacing: 0.04em; text-transform: uppercase; background: var(--bg-2); }
tr:last-child td { border-bottom: none; }
tbody tr { transition: background 0.12s; }
tbody tr:hover { background: var(--panel-2); }
.code { font-family: ui-monospace, 'SF Mono', Menlo, monospace; font-size: 12px; }
.badge { padding: 3px 10px; font-size: 12px; font-weight: 600; }
.badge.enabled { background: rgba(22,163,74,.12); color: var(--green); }
.badge.disabled { background: rgba(224,65,63,.12); color: var(--danger); }
.badge.exhausted { background: rgba(217,119,6,.13); color: var(--warn); }
.badge.tier { background: rgba(79,70,229,.10); color: var(--accent); }

/* mini bar for percentages */
.bar { width: 90px; height: 6px; background: var(--bg-2); overflow: hidden; display: inline-block; vertical-align: middle; border: 1px solid var(--border-soft); }
.bar > span { display: block; height: 100%; background: var(--accent); }

/* ===== modal ===== */
.modal { position: fixed; inset: 0; background: rgba(27,34,48,.35); display: flex; align-items: center; justify-content: center; z-index: 100; }
.modal-card { background: var(--panel); border: 1px solid var(--border); width: 460px; max-width: 92vw; }
.modal-head { display: flex; justify-content: space-between; align-items: center; padding: 18px 22px; border-bottom: 1px solid var(--border-soft); font-weight: 700; }
#modal-body { padding: 22px; }
.field { margin-bottom: 16px; }
.field label { display: block; color: var(--muted); margin-bottom: 7px; font-size: 13px; }
.field input, .field select { width: 100%; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 22px; }

/* ===== toast ===== */
.toast {
  position: fixed; bottom: 26px; left: 50%; transform: translateX(-50%);
  background: var(--text); border: 1px solid var(--text); color: #fff;
  padding: 12px 22px; z-index: 200;
}
.toast.err { background: var(--danger); border-color: var(--danger); color: #fff; }

/* ===== docs ===== */
.docs { display: flex; flex-direction: column; gap: 16px; max-width: 880px; }
.docs .panel { padding: 0; }
.docs-section { padding: 22px 24px; }
.docs-section + .docs-section { border-top: 1px solid var(--border-soft); }
.docs h3 { font-size: 16px; display: flex; align-items: center; gap: 10px; }
.docs h3 .step { width: 24px; height: 24px; display: grid; place-items: center; font-size: 12px; font-weight: 800; color: #fff; background: var(--accent); }
.docs p { color: var(--muted); line-height: 1.7; margin: 8px 0; }
.docs ul { color: var(--muted); line-height: 1.8; padding-left: 20px; margin: 8px 0; }
.docs code.inline { background: var(--bg-2); border: 1px solid var(--border-soft); padding: 1px 6px; font-family: ui-monospace, Menlo, monospace; font-size: 12.5px; color: var(--accent-2); }
.codeblock { position: relative; background: #0f1422; border: 1px solid #1c2436; margin: 12px 0; }
.codeblock pre { margin: 0; padding: 16px 18px; overflow-x: auto; font-family: ui-monospace, 'SF Mono', Menlo, monospace; font-size: 12.5px; line-height: 1.65; color: #d7deec; }
.codeblock .copy { position: absolute; top: 10px; right: 10px; padding: 4px 10px; font-size: 12px; background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.14); color: #d7deec; }
.codeblock .copy:hover { background: rgba(255,255,255,0.16); }
.codeblock .ch { color: #7da2ff; }
.endpoint-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 12px; }
.endpoint-grid .ep { background: var(--bg-2); border: 1px solid var(--border-soft); padding: 10px 12px; }
.endpoint-grid .ep b { font-size: 13px; }
.endpoint-grid .ep div { color: var(--muted); font-size: 12px; margin-top: 2px; font-family: ui-monospace, Menlo, monospace; }
.callout { background: rgba(79,70,229,0.06); border: 1px solid rgba(79,70,229,0.22); border-left: 3px solid var(--accent); padding: 14px 16px; color: #3a3f57; line-height: 1.7; font-size: 13px; }
.callout.warn { background: rgba(217,119,6,0.07); border-color: rgba(217,119,6,0.26); border-left-color: var(--warn); color: #7a4f10; }

@media (max-width: 820px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; flex-direction: row; flex-wrap: wrap; align-items: center; }
  .nav { flex-direction: row; flex-wrap: wrap; flex: 1 1 100%; }
  .endpoint-grid { grid-template-columns: 1fr; }
}