:root {
  --page: #edf2f4;
  --card: #ffffff;
  --ink: #0f1419;
  --muted: #536471;
  --line: #d7e0e4;
  --blue: #1d9bf0;
  --blue-dark: #1684cc;
  --error: #d91f2b;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
}

body {
  color: var(--ink);
  background:
    radial-gradient(circle at 18% 18%, rgba(29, 155, 240, 0.13), transparent 34%),
    linear-gradient(145deg, #f7fafb 0%, var(--page) 68%, #e4ebee 100%);
  font-family: var(--font);
}

.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 28px;
}

.login-card {
  width: min(430px, 100%);
  padding: 38px;
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid rgba(207, 217, 222, 0.9);
  border-radius: 20px;
  box-shadow: 0 24px 70px rgba(15, 20, 25, 0.12);
}

.brand-mark {
  width: 44px;
  height: 44px;
  margin-bottom: 22px;
  border-radius: 13px;
  background: linear-gradient(135deg, var(--blue), #536471);
  box-shadow: 0 9px 22px rgba(29, 155, 240, 0.25);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--blue-dark);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.12em;
}

h1 {
  margin: 0;
  font-size: 28px;
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.intro {
  margin: 10px 0 26px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

label {
  display: block;
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.password-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 9px;
}

input,
button {
  min-height: 44px;
  border-radius: 10px;
  font: inherit;
}

input {
  width: 100%;
  padding: 0 13px;
  color: var(--ink);
  background: #f7f9f9;
  border: 1px solid var(--line);
  outline: none;
  transition:
    border-color 0.16s ease,
    box-shadow 0.16s ease;
}

input:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(29, 155, 240, 0.14);
}

button {
  padding: 0 19px;
  color: #ffffff;
  background: var(--blue);
  border: 0;
  font-weight: 750;
  cursor: pointer;
  transition:
    background 0.16s ease,
    transform 0.16s ease;
}

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

button:active:not(:disabled) {
  transform: scale(0.97);
}

button:disabled {
  opacity: 0.6;
  cursor: wait;
}

.login-status {
  min-height: 20px;
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.login-status.error {
  color: var(--error);
}

.security-note {
  margin: 22px 0 0;
  padding-top: 18px;
  color: #8b98a5;
  border-top: 1px solid #edf0f2;
  font-size: 11px;
  line-height: 1.55;
}

@media (max-width: 520px) {
  .login-page {
    align-items: start;
    padding: 18px;
  }

  .login-card {
    margin-top: 9vh;
    padding: 28px 22px;
  }

  .password-row {
    grid-template-columns: 1fr;
  }
}