:root {
  color-scheme: light dark;
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC",
    "PingFang SC", "Hiragino Sans GB", sans-serif;
  --background: #f4f6f9;
  --surface: #ffffff;
  --text: #152033;
  --muted: #5f6b7c;
  --border: #d7dde6;
  --accent: #1768d5;
  --accent-hover: #0e55b6;
  --success: #0b6b3a;
  --success-bg: #eaf8f0;
  --error: #a92828;
  --error-bg: #fff0f0;
  --info: #315878;
  --info-bg: #edf5fb;
  --shadow: 0 18px 45px rgb(25 43 70 / 10%);
}

* {
  box-sizing: border-box;
}

html {
  background: var(--background);
}

body {
  min-width: 280px;
  min-height: 100vh;
  min-height: 100svh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgb(23 104 213 / 9%), transparent 38rem),
    var(--background);
}

main {
  display: grid;
  min-height: 100vh;
  min-height: 100svh;
  place-items: center;
  padding:
    max(1.25rem, env(safe-area-inset-top))
    max(1rem, env(safe-area-inset-right))
    max(1.25rem, env(safe-area-inset-bottom))
    max(1rem, env(safe-area-inset-left));
}

.card {
  width: min(100%, 31rem);
  padding: clamp(1.4rem, 5vw, 2.25rem);
  border: 1px solid var(--border);
  border-radius: 1.25rem;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 0.65rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(1.65rem, 7vw, 2.15rem);
  line-height: 1.2;
  letter-spacing: -0.025em;
}

.lead {
  margin: 0.9rem 0 0;
  color: var(--muted);
  line-height: 1.65;
}

.en {
  display: block;
  margin-top: 0.15rem;
  font-size: 0.91em;
}

form {
  display: grid;
  gap: 1.05rem;
  margin-top: 1.5rem;
}

.field {
  display: grid;
  gap: 0.5rem;
}

label {
  font-weight: 680;
  line-height: 1.35;
}

input {
  width: 100%;
  min-height: 3rem;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 0.7rem;
  color: var(--text);
  background: var(--surface);
  font: inherit;
}

input:hover {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
}

input:focus-visible,
button:focus-visible,
a:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 40%, transparent);
  outline-offset: 2px;
}

.hint {
  margin: -0.1rem 0 0;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.5;
}

button {
  min-height: 3rem;
  padding: 0.7rem 1rem;
  border: 0;
  border-radius: 0.7rem;
  color: #ffffff;
  background: var(--accent);
  font: inherit;
  font-weight: 720;
  cursor: pointer;
}

button:hover:not(:disabled) {
  background: var(--accent-hover);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.58;
}

.status {
  margin-top: 1.4rem;
  padding: 0.9rem 1rem;
  border: 1px solid transparent;
  border-radius: 0.75rem;
  font-size: 0.94rem;
  line-height: 1.55;
  white-space: pre-line;
}

.status[data-tone="info"] {
  border-color: color-mix(in srgb, var(--info) 24%, transparent);
  color: var(--info);
  background: var(--info-bg);
}

.status[data-tone="success"] {
  border-color: color-mix(in srgb, var(--success) 24%, transparent);
  color: var(--success);
  background: var(--success-bg);
}

.status[data-tone="error"] {
  border-color: color-mix(in srgb, var(--error) 24%, transparent);
  color: var(--error);
  background: var(--error-bg);
}

.status:empty,
[hidden] {
  display: none;
}

.footer-note {
  margin: 1.4rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.55;
}

.home-link {
  display: inline-block;
  margin-top: 1.25rem;
  color: var(--accent);
  font-weight: 680;
  text-underline-offset: 0.2em;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #0d1420;
    --surface: #151f2e;
    --text: #edf3fb;
    --muted: #aab7c7;
    --border: #334257;
    --accent: #75afff;
    --accent-hover: #94c1ff;
    --success: #8be0ae;
    --success-bg: #123222;
    --error: #ffadad;
    --error-bg: #3c1d21;
    --info: #a8cef0;
    --info-bg: #172d40;
    --shadow: 0 18px 45px rgb(0 0 0 / 28%);
  }

  button {
    color: #071425;
    background: var(--accent);
  }
}

@media (max-width: 360px) {
  .card {
    border-radius: 1rem;
  }
}