:root {
  --brand: #002d55;
  --brand-dark: #001f3d;
  --brand-line: #7aa0bf;
  --bg: #f4f7fa;
  --surface: #ffffff;
  --text: #1f2933;
  --muted: #617385;
  --line: #d4dde6;
  --danger: #b42318;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(135deg, rgba(0, 45, 85, 0.08), rgba(122, 160, 191, 0.04) 38%, rgba(255, 255, 255, 0) 76%),
    var(--bg);
  color: var(--text);
  font-family: Inter, "Hiragino Sans", "Yu Gothic", system-ui, sans-serif;
  letter-spacing: 0;
}

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

.login-panel {
  width: min(560px, 100%);
  padding: 34px;
  border: 1px solid var(--line);
  border-top: 6px solid var(--brand);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 22px 60px rgba(0, 45, 85, 0.13);
}

.brand {
  display: flex;
  align-items: center;
  gap: 24px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line);
}

.brand img {
  width: 170px;
  max-width: 42%;
  height: auto;
  object-fit: contain;
}

.brand p {
  margin: 0 0 4px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.brand h1 {
  margin: 0;
  color: var(--brand);
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1.05;
}

.login-form {
  display: grid;
  gap: 16px;
  margin-top: 26px;
}

label {
  display: grid;
  gap: 7px;
}

label span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

input {
  width: 100%;
  height: 48px;
  border: 1px solid #bfd1df;
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(0, 45, 85, 0.04), rgba(255, 255, 255, 0) 45%),
    #fff;
  color: var(--brand);
  padding: 0 14px;
  font: inherit;
  font-size: 18px;
  font-weight: 700;
}

input:focus {
  outline: 0;
  border-color: var(--brand-line);
  box-shadow: 0 0 0 4px rgba(122, 160, 191, 0.18);
}

button {
  height: 50px;
  margin-top: 6px;
  border: 0;
  border-radius: 8px;
  background: var(--brand);
  color: #fff;
  cursor: pointer;
  font: inherit;
  font-size: 18px;
  font-weight: 800;
}

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

button:disabled {
  cursor: wait;
  opacity: 0.7;
}

.error {
  margin: 0;
  padding: 12px 14px;
  border: 1px solid #f4b7ad;
  border-radius: 8px;
  background: #fff5f3;
  color: var(--danger);
  font-weight: 700;
  white-space: pre-line;
}

@media (max-width: 640px) {
  .login-panel {
    padding: 24px;
  }

  .brand {
    display: grid;
    gap: 18px;
  }

  .brand img {
    max-width: 210px;
    width: 62%;
  }
}