/* ── Design system global Home Hub ─────────────────────────────── */
:root {
  --bg: #f5f6f8;
  --bg-elevated: #ffffff;
  --border: #e2e4e9;
  --text-primary: #14161a;
  --text-secondary: #6b7280;
  --accent: #2563eb;
  --accent-soft: #dbeafe;
  --ok: #16a34a;
  --ok-soft: #dcfce7;
  --danger: #dc2626;
  --danger-soft: #fee2e2;
  --warn: #d97706;
  --warn-soft: #fef3c7;
  --muted-soft: #eef0f3;
  --shadow: 0 1px 2px rgba(0,0,0,0.04), 0 1px 6px rgba(0,0,0,0.03);
  --radius: 10px;
}

[data-theme="dark"] {
  --bg: #0f1115;
  --bg-elevated: #171a21;
  --border: #262a33;
  --text-primary: #f1f2f4;
  --text-secondary: #8b8f99;
  --accent: #5b8def;
  --accent-soft: #1c2a45;
  --ok: #34d399;
  --ok-soft: #0f2a20;
  --danger: #f87171;
  --danger-soft: #3a1818;
  --warn: #fbbf24;
  --warn-soft: #3a2c0c;
  --muted-soft: #1c1f26;
  --shadow: 0 1px 2px rgba(0,0,0,0.3), 0 4px 16px rgba(0,0,0,0.25);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease, color 0.15s ease;
  -webkit-font-smoothing: antialiased;
}

/* ── Card ────────────────────────────────────────────────────────── */
.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
  width: 100%;
  max-width: 400px;
}

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: .25rem;
}

.card-subtitle {
  font-size: .8125rem;
  color: var(--text-secondary);
  margin-bottom: 1.75rem;
}

/* ── Form ────────────────────────────────────────────────────────── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: .375rem;
  margin-bottom: .875rem;
}

label {
  font-size: .75rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: .05em;
}

input {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: .9375rem;
  font-family: inherit;
  padding: .625rem .875rem;
  outline: none;
  transition: border-color .15s ease, box-shadow .15s ease;
  width: 100%;
}

input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}

input::placeholder { color: var(--text-secondary); opacity: .6; }

/* ── Button ──────────────────────────────────────────────────────── */
.btn {
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-family: inherit;
  font-size: .9375rem;
  font-weight: 500;
  padding: .675rem 1.25rem;
  transition: background .15s ease, border-color .15s ease;
  width: 100%;
  margin-top: .375rem;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover { background: color-mix(in srgb, var(--accent) 85%, #000); }

.btn-ghost {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-primary);
}

.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ── Tabs (login / register) ─────────────────────────────────────── */
.tabs {
  display: flex;
  gap: .25rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .25rem;
  margin-bottom: 1.5rem;
}

.tab {
  flex: 1;
  background: transparent;
  border: none;
  border-radius: 7px;
  color: var(--text-secondary);
  cursor: pointer;
  font-family: inherit;
  font-size: .875rem;
  font-weight: 500;
  padding: .5rem;
  transition: background .15s ease, color .15s ease;
}

.tab.active {
  background: var(--bg-elevated);
  color: var(--text-primary);
  box-shadow: var(--shadow);
}

/* ── Alert ───────────────────────────────────────────────────────── */
.alert {
  border-radius: var(--radius);
  font-size: .8125rem;
  margin-bottom: 1rem;
  padding: .75rem 1rem;
  display: none;
}

.alert.visible { display: block; }

.alert-error {
  background: var(--danger-soft);
  border: 1px solid color-mix(in srgb, var(--danger) 30%, transparent);
  color: var(--danger);
}

.alert-success {
  background: var(--ok-soft);
  border: 1px solid color-mix(in srgb, var(--ok) 30%, transparent);
  color: var(--ok);
}

/* ── Theme toggle ────────────────────────────────────────────────── */
.theme-toggle {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
  display: flex;
  align-items: center;
  gap: .5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: .25rem;
}

.theme-toggle button {
  border: none;
  background: transparent;
  color: var(--text-secondary);
  width: 30px;
  height: 26px;
  border-radius: 999px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: background .15s ease, color .15s ease;
}

.theme-toggle button.active {
  background: var(--accent-soft);
  color: var(--accent);
}

/* ── Logo ────────────────────────────────────────────────────────── */
.hub-logo {
  display: flex;
  align-items: center;
  gap: .625rem;
  margin-bottom: 1.5rem;
}

.hub-logo-icon {
  background: var(--accent-soft);
  border-radius: 9px;
  color: var(--accent);
  font-size: 1.125rem;
  height: 36px;
  width: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hub-logo-name {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.hidden { display: none !important; }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}