:root {
  /* Color — monochrome premium palette, one functional accent */
  --bg: #FFFFFF;
  --surface: #FAFAFA;
  --surface-hover: #F3F4F6;
  --border: #E5E7EB;
  --border-strong: #D1D5DB;
  --text: #0B0D12;
  --text-dim: #6B7280;
  --text-faint: #9CA3AF;
  --black: #111827;
  --black-hover: #1F2937;
  --accent: #2563EB;   /* used sparingly: links, focus rings */
  --ok: #16A34A;
  --danger: #DC2626;
  --danger-bg: #FEF2F2;

  --font-body: 'Inter', -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  font-size: 15px;
  line-height: 1.5;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 {
  font-family: var(--font-body);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 6px;
  color: var(--text);
}

.mono { font-family: var(--font-mono); font-size: 0.85em; letter-spacing: 0; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

/* ---- Status dot ---- */
.dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; margin-right: 6px; background: var(--text-faint); flex-shrink: 0; }
.dot--ok { background: var(--ok); box-shadow: 0 0 0 3px rgba(22, 163, 74, 0.15); }
.dot--off { background: var(--danger); }

/* ---- Auth pages ---- */
.auth-body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.auth-card {
  width: 100%;
  max-width: 400px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  box-shadow: var(--shadow-md);
}

.auth-card__brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 28px;
  font-size: 15px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 7px;
  background: var(--black);
  color: #fff;
  font-weight: 700;
  font-size: 12px;
}

.auth-card h1 { font-size: 22px; }
.auth-card__sub { color: var(--text-dim); font-size: 14px; margin: 0 0 24px; }
.auth-card__foot { margin-top: 22px; font-size: 14px; color: var(--text-dim); text-align: center; }
.auth-card__foot a { color: var(--text); font-weight: 600; text-decoration: underline; }

/* ---- Forms ---- */
form label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin: 16px 0 6px;
}
form label:first-of-type { margin-top: 0; }

input[type="text"],
input[type="email"],
input[type="password"] {
  width: 100%;
  padding: 11px 13px;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 14px;
  font-family: var(--font-body);
  transition: border-color 0.15s ease;
}
input:focus { border-color: var(--black); outline: none; box-shadow: 0 0 0 3px rgba(17, 24, 39, 0.08); }

.field-hint { font-size: 12px; color: var(--text-faint); margin: 6px 0 0; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 11px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font-body);
  transition: background 0.15s ease, border-color 0.15s ease;
}
.btn--primary { background: var(--black); color: #fff; }
.btn--primary:hover { background: var(--black-hover); text-decoration: none; }
.btn--secondary { background: #fff; color: var(--text); border-color: var(--border-strong); }
.btn--secondary:hover { background: var(--surface); text-decoration: none; }
.btn--block { width: 100%; margin-top: 22px; }
.btn[disabled], .btn--disabled {
  background: var(--surface);
  color: var(--text-faint);
  border-color: var(--border);
  cursor: not-allowed;
}
.btn[disabled]:hover, .btn--disabled:hover { background: var(--surface); text-decoration: none; }

.badge-soon {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-faint);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 2px 6px;
  border-radius: 5px;
  margin-left: auto;
}

.alert {
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  margin-bottom: 10px;
  border: 1px solid transparent;
}
.alert--error { background: var(--danger-bg); border-color: #FECACA; color: #991B1B; }

/* ---- App shell ---- */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  z-index: 20;
}
.topbar__left { display: flex; align-items: center; gap: 10px; }
.topbar__brand { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 14px; }
.topbar__right { display: flex; align-items: center; gap: 14px; }
.topbar__user { font-size: 13px; color: var(--text-dim); display: flex; align-items: center; gap: 6px; }
.topbar__role {
  font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.03em;
  color: var(--text-dim); background: var(--surface); border: 1px solid var(--border);
  padding: 2px 7px; border-radius: 999px;
}
.topbar__logout button {
  background: none; border: 1px solid var(--border-strong); color: var(--text);
  font-size: 13px; font-weight: 600; cursor: pointer; padding: 6px 12px; border-radius: var(--radius-sm);
}
.topbar__logout button:hover { background: var(--surface); }

.menu-toggle {
  display: none;
  background: none; border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  width: 34px; height: 34px; cursor: pointer; align-items: center; justify-content: center;
}
.menu-toggle span, .menu-toggle span::before, .menu-toggle span::after {
  content: ''; display: block; width: 16px; height: 2px; background: var(--text); position: relative;
}
.menu-toggle span::before { position: absolute; top: -5px; }
.menu-toggle span::after { position: absolute; top: 5px; }

.sidenav {
  position: fixed;
  top: 56px; bottom: 0; left: 0;
  width: 224px;
  background: var(--bg);
  border-right: 1px solid var(--border);
  padding: 18px 12px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow-y: auto;
}
.sidenav__label {
  font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--text-faint); padding: 10px 10px 6px;
}
.sidenav__link {
  display: flex; align-items: center; gap: 8px;
  padding: 9px 10px;
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-size: 14px;
  font-weight: 500;
}
.sidenav__link:hover { background: var(--surface); text-decoration: none; color: var(--text); }
.sidenav__link.is-active { background: var(--black); color: #fff; }
.sidenav__divider { height: 1px; background: var(--border); margin: 10px 4px; }

.app-main {
  margin-left: 224px;
  padding: 84px 32px 48px;
  max-width: 1040px;
}

.page-head { margin-bottom: 26px; }
.page-head__sub { color: var(--text-dim); font-size: 14px; margin: 0; }

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin-bottom: 28px;
}
.stat-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  box-shadow: var(--shadow-sm);
}
.stat-card__label { color: var(--text-dim); font-size: 13px; font-weight: 500; }
.stat-card__value { font-size: 28px; font-weight: 700; letter-spacing: -0.02em; }

.empty-state {
  background: var(--surface);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 40px 24px;
  text-align: center;
  color: var(--text-dim);
}
.empty-state p { margin: 0 0 14px; font-size: 14px; }

.data-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.data-table th, .data-table td {
  text-align: left;
  padding: 13px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}
.data-table th { color: var(--text-dim); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: 0.03em; background: var(--surface); }
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: var(--surface); }

.tag {
  display: inline-block;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}
.tag--admin { background: #111827; color: #fff; }
.tag--client { background: var(--surface); color: var(--text-dim); border: 1px solid var(--border); }

/* ---- Mobile ---- */
@media (max-width: 860px) {
  .menu-toggle { display: inline-flex; }
  .sidenav {
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    box-shadow: var(--shadow-md);
    z-index: 30;
  }
  .sidenav.is-open { transform: translateX(0); }
  .app-main { margin-left: 0; padding: 76px 18px 32px; }
  .topbar__user span:not(.mono) { display: none; }
}