:root {
  --ink: #16212d;
  --muted: #687584;
  --line: #d8e0e8;
  --panel: #ffffff;
  --page: #edf2f6;
  --accent: #0f8b8d;
  --accent-dark: #0a6466;
  --success: #176d43;
  --success-bg: #e1f5ea;
  --warning: #8a5a00;
  --warning-bg: #fff3d8;
  --error: #a9322c;
  --error-bg: #fde6e3;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background:
    linear-gradient(135deg, rgba(15, 139, 141, 0.18), transparent 36%),
    linear-gradient(315deg, rgba(169, 50, 44, 0.1), transparent 38%),
    var(--page);
}

button,
input {
  font: inherit;
}

.page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.panel {
  width: min(920px, 100%);
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 22px;
  align-items: start;
  padding: 26px;
  border: 1px solid rgba(255, 255, 255, 0.78);
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 24px 70px rgba(31, 48, 66, 0.16);
}

.intro,
.ip-box,
.alert {
  grid-column: 1;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent-dark);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  max-width: 560px;
  margin-bottom: 14px;
  font-size: clamp(32px, 5vw, 56px);
  line-height: 1.04;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 18px;
  font-size: 20px;
}

.lead {
  max-width: 560px;
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.75;
}

.ip-box {
  display: grid;
  gap: 8px;
  width: min(100%, 520px);
  padding: 18px;
  border: 1px solid var(--line);
  background: #f8fbfc;
}

.ip-box span {
  color: var(--muted);
  font-size: 13px;
}

.ip-box strong {
  font-size: clamp(24px, 4vw, 36px);
  overflow-wrap: anywhere;
}

.card {
  grid-column: 2;
  grid-row: 1 / span 5;
  display: grid;
  gap: 16px;
  padding: 22px;
  border: 1px solid var(--line);
  background: var(--panel);
}

label {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 14px;
}

input {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  outline: 0;
  color: var(--ink);
  background: #fbfdfe;
}

input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(15, 139, 141, 0.18);
}

button,
.secondary {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  border: 0;
  text-decoration: none;
  cursor: pointer;
}

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

button:hover {
  background: var(--accent-dark);
}

.secondary {
  color: var(--ink);
  background: #eef3f6;
}

.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.alert {
  width: min(100%, 520px);
  padding: 14px 16px;
  border: 1px solid transparent;
  line-height: 1.55;
}

.alert.success {
  color: var(--success);
  border-color: #a8d9bc;
  background: var(--success-bg);
}

.alert.warning {
  color: var(--warning);
  border-color: #e6c779;
  background: var(--warning-bg);
}

.alert.error {
  color: var(--error);
  border-color: #efaaa5;
  background: var(--error-bg);
}

@media (max-width: 780px) {
  .page {
    padding: 0;
    place-items: stretch;
  }

  .panel {
    min-height: 100vh;
    grid-template-columns: 1fr;
    gap: 18px;
    padding: 22px;
    border: 0;
  }

  .intro,
  .ip-box,
  .alert,
  .card {
    grid-column: 1;
  }

  .card {
    grid-row: auto;
  }
}