:root {
  --login-bg: #ffffff;
  --login-card-bg: #f4f6fb;
  --login-text: #172136;
  --login-lead: #4a5568;
  --login-border: #d7dce6;
  --login-accent: #ffd666;
  --login-accent-text: #172136;
  --login-error: #c0392b;
  --login-input-bg: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --login-bg: #172136;
    --login-card-bg: #1f2c47;
    --login-text: #f4f6fb;
    --login-lead: #b7c1d6;
    --login-border: #33456b;
    --login-accent-text: #172136;
    --login-error: #ff8a80;
    --login-input-bg: #131c2e;
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100dvh;
  min-height: 100svh;
  background: var(--login-bg);
  color: var(--login-text);
  font-family: system-ui, -apple-system, "Hiragino Sans", sans-serif;
  overscroll-behavior-y: contain;
}

.login-screen {
  min-height: 100dvh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  padding-bottom: max(24px, env(safe-area-inset-bottom));
}

.login-card {
  width: 100%;
  max-width: 360px;
  background: var(--login-card-bg);
  border: 1px solid var(--login-border);
  border-radius: 16px;
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.login-title {
  margin: 0;
  font-size: 20px;
  line-height: 1.4;
  font-weight: 700;
}

.login-lead {
  margin: 0 0 4px;
  font-size: 15px;
  color: var(--login-lead);
}

.login-error {
  margin: 0;
  font-size: 14px;
  color: var(--login-error);
  font-weight: 600;
}

.login-input {
  width: 100%;
  min-height: 52px;
  font-size: 18px;
  padding: 0 14px;
  border-radius: 10px;
  border: 1px solid var(--login-border);
  background: var(--login-input-bg);
  color: var(--login-text);
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.login-submit {
  min-height: 52px;
  font-size: 17px;
  font-weight: 700;
  border: none;
  border-radius: 10px;
  background: var(--login-accent);
  color: var(--login-accent-text);
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.login-submit:active {
  opacity: 0.85;
}