:root {
  color-scheme: light dark;
  --ui-surface: #fff;
  --ui-raised: #f3f6fa;
  --ui-input: #fff;
  --ui-text: #182638;
  --ui-muted: #53657a;
  --ui-line: #d9e2ed;
  --ui-focus: #1670c5;
  --page-bg: #f4f7fb;
  --brand: #0b3a67;
  --brand-hover: #071b35;
  --on-brand: #fff;
  --message-bg: #fffaf0;
  --message-text: #73570c;
  --message-line: #eadca9;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ui-surface: #182333;
    --ui-raised: #223146;
    --ui-input: #101c2b;
    --ui-text: #e8eef7;
    --ui-muted: #afbed0;
    --ui-line: #3d5067;
    --ui-focus: #7dc4ff;
    --page-bg: #101925;
    --brand: #7dc4ff;
    --brand-hover: #a7d7ff;
    --on-brand: #101c2b;
    --message-bg: #3a3020;
    --message-text: #f5d18b;
    --message-line: #77613a;
  }
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--page-bg); color: var(--ui-text); font-family: system-ui, -apple-system, "Tahoma", sans-serif; font-size: 16px; line-height: 1.5; }
button, input { font: inherit; }
button { cursor: pointer; }
.host-login { min-height: 100vh; min-height: 100dvh; display: grid; place-items: center; padding: max(24px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) max(24px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left)); }
.host-login-form { width: min(430px, 100%); min-width: 0; padding: 28px 24px; border: 1px solid var(--ui-line); border-radius: 18px; background: var(--ui-surface); }
.host-brand { display: flex; align-items: center; gap: 16px; margin-bottom: 28px; font-weight: 700; font-size: 20px; }
.host-logo { display: block; flex-shrink: 0; width: 72px; height: 72px; object-fit: contain; border-radius: 10px; }
h1 { margin: 0; font-size: 28px; line-height: 1.3; }
.login-intro { margin: 8px 0 24px; color: var(--ui-muted); }
.host-form-grid { display: grid; gap: 8px; }
.host-form-grid label { font-weight: 600; }
.host-form-grid label[for="password"] { margin-top: 12px; }
.host-input { width: 100%; min-width: 0; min-height: 48px; border: 1px solid var(--ui-line); border-radius: 10px; padding: 11px 12px; background: var(--ui-input); color: var(--ui-text); }
.login-password-wrap { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px; }
.login-password-toggle { min-width: 64px; min-height: 48px; padding: 10px 12px; border: 1px solid var(--ui-line); border-radius: 10px; background: var(--ui-raised); color: var(--ui-text); }
.login-password-toggle:hover { border-color: var(--ui-focus); }
.login-message { margin: 8px 0; padding: 10px 12px; border: 1px solid var(--message-line); border-radius: 10px; background: var(--message-bg); color: var(--message-text); overflow-wrap: anywhere; }
.login-message:empty { margin: 4px 0; padding: 0; border: 0; }
.host-btn { width: 100%; min-height: 48px; padding: 12px 16px; border: 1px solid transparent; border-radius: 10px; background: var(--brand); color: var(--on-brand); font-weight: 700; }
.host-btn:hover { background: var(--brand-hover); }
button:disabled { opacity: .65; cursor: wait; }
:is(button, input):focus-visible { outline: 3px solid var(--ui-focus); outline-offset: 3px; }
@media (min-width: 640px) { .host-login-form { padding: 32px; } }