:root {
  --blue-900: #102a43;
  --blue-800: #173f67;
  --blue-700: #1f5f99;
  --blue-600: #2675bd;
  --surface: #ffffff;
  --surface-soft: #f6f8fb;
  --text: #172033;
  --muted: #667085;
  --border: #d9e2ec;
  --danger: #b42318;
  --danger-bg: #fff1f0;
  --success: #027a48;
  --warning: #8a5200;
  --warning-bg: #fff7e6;
  --focus: rgba(38, 117, 189, 0.24);
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background:
    radial-gradient(circle at 12% 18%, rgba(38, 117, 189, 0.16), transparent 28%),
    linear-gradient(135deg, #eef5fb 0%, #f8fbff 46%, #ffffff 100%);
}

.login-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(360px, 0.95fr) minmax(420px, 1.05fr);
}

.brand-panel {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: clamp(2rem, 5vw, 4.5rem);
  color: #ffffff;
  background:
    linear-gradient(155deg, rgba(16, 42, 67, 0.96), rgba(31, 95, 153, 0.92)),
    url("../images/airdata-logo.png") center 58% / min(66%, 440px) no-repeat;
}

.brand-mark {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.brand-mark img {
  width: 58px;
  height: 58px;
  object-fit: contain;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.92);
  padding: 0.35rem;
}

.brand-mark strong {
  display: block;
  font-size: 1.15rem;
  line-height: 1.1;
}

.brand-mark span,
.brand-footnote {
  color: rgba(255, 255, 255, 0.76);
  font-size: 0.92rem;
}

.brand-copy {
  position: relative;
  z-index: 1;
  max-width: 520px;
  padding: 9vh 0;
}

.brand-copy h1 {
  margin: 0 0 1rem;
  font-size: clamp(2.4rem, 5vw, 4.35rem);
  line-height: 1;
  letter-spacing: 0;
}

.brand-copy p {
  margin: 0;
  max-width: 34rem;
  color: rgba(255, 255, 255, 0.82);
  font-size: clamp(1rem, 1.8vw, 1.18rem);
  line-height: 1.65;
}

.brand-stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  max-width: 520px;
}

.brand-stat {
  border-top: 1px solid rgba(255, 255, 255, 0.28);
  padding-top: 1rem;
}

.brand-stat strong {
  display: block;
  margin-bottom: 0.3rem;
  font-size: 1rem;
}

.brand-stat span {
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.84rem;
  line-height: 1.45;
}

.form-panel {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(1.5rem, 5vw, 4rem);
}

.login-card {
  width: min(100%, 440px);
}

.login-card > img {
  width: 182px;
  height: auto;
  display: block;
  margin-bottom: 2rem;
}

.login-card h2 {
  margin: 0 0 0.6rem;
  color: var(--blue-900);
  font-size: clamp(1.8rem, 4vw, 2.35rem);
  line-height: 1.1;
  letter-spacing: 0;
}

.login-card > p {
  margin: 0 0 1.35rem;
  color: var(--muted);
  line-height: 1.6;
}

.login-form {
  display: grid;
  gap: 1rem;
}

.field label {
  display: block;
  margin-bottom: 0.45rem;
  color: #344054;
  font-size: 0.9rem;
  font-weight: 650;
}

.field input {
  width: 100%;
  min-height: 48px;
  padding: 0.76rem 0.92rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  background: var(--surface);
  font-size: 1rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.field input:focus,
.primary-button:focus-visible,
.oauth-button:focus-visible {
  outline: none;
  border-color: var(--blue-600);
  box-shadow: 0 0 0 4px var(--focus);
}

.primary-button,
.oauth-button {
  width: 100%;
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  margin-top: 0.35rem;
  border: 0;
  border-radius: 8px;
  color: #ffffff;
  background: linear-gradient(135deg, var(--blue-700), var(--blue-600));
  box-shadow: 0 12px 24px rgba(31, 95, 153, 0.22);
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.primary-button:hover,
.oauth-button:hover {
  transform: translateY(-1px);
  background: linear-gradient(135deg, var(--blue-800), var(--blue-700));
}

.divider {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1.6rem 0;
  color: #98a2b3;
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.divider::before,
.divider::after {
  content: "";
  height: 1px;
  flex: 1;
  background: var(--border);
}

.login-error,
.login-warning,
.login-status,
.support-note {
  margin-bottom: 1rem;
  padding: 0.9rem 1rem;
  border-radius: 8px;
  font-size: 0.88rem;
  line-height: 1.5;
}

.login-error {
  border: 1px solid #fecdca;
  color: var(--danger);
  background: var(--danger-bg);
}

.login-warning {
  border: 1px solid #fedf89;
  color: var(--warning);
  background: var(--warning-bg);
}

.login-status {
  border: 1px solid var(--border);
  color: #475467;
  background: var(--surface-soft);
}

.login-status strong,
.login-status span {
  display: block;
}

.login-status span {
  margin-top: 0.2rem;
  color: #475467;
}

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

.support-note {
  margin: 1.45rem 0 0;
  color: #475467;
  background: var(--surface-soft);
}

.support-note code {
  color: #344054;
  font-size: 0.82rem;
  word-break: break-all;
}

@media (max-width: 900px) {
  body {
    background: #ffffff;
  }

  .login-shell {
    grid-template-columns: 1fr;
  }

  .brand-panel {
    min-height: 34vh;
    padding: 1.5rem;
    background:
      linear-gradient(155deg, rgba(16, 42, 67, 0.96), rgba(31, 95, 153, 0.92)),
      url("../images/airdata-logo.png") right 1.5rem bottom 1rem / 190px no-repeat;
  }

  .brand-copy {
    padding: 3rem 0 1.2rem;
  }

  .brand-stats {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .brand-stat {
    padding-top: 0.75rem;
  }

  .form-panel {
    align-items: flex-start;
    padding: 2rem 1.35rem 2.5rem;
  }

  .login-card > img {
    display: none;
  }
}

@media (max-width: 520px) {
  .brand-copy h1 {
    font-size: 2.4rem;
  }

  .brand-copy p,
  .brand-stats {
    display: none;
  }

  .brand-panel {
    min-height: 220px;
  }
}