:root {
  --color-bg-base: #0f1722;
  --color-bg-surface: #ffffff;
  --color-border: #d8e0ea;
  --color-text-primary: #17212f;
  --color-text-secondary: #526173;
  --color-text-on-dark: #eef4fb;
  --color-accent: #1668b8;
  --color-accent-hover: #0f5599;
  --radius-sm: 4px;
  --radius-md: 10px;
  --radius-lg: 18px;
  --shadow-lg: 0 20px 44px rgba(8, 16, 28, 0.24);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(22, 104, 184, 0.26), transparent 28%),
    linear-gradient(135deg, #0f1722 0%, #182537 55%, #10233a 100%);
  color: var(--color-text-on-dark);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input {
  font: inherit;
}

.landing-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(360px, 440px);
  gap: 40px;
  width: min(1160px, calc(100% - 48px));
  min-height: 100vh;
  margin: 0 auto;
  padding: 48px 0;
  align-items: center;
}

.hero h1 {
  max-width: 720px;
  margin: 0 0 18px;
  font-size: clamp(40px, 5vw, 64px);
  line-height: 1.02;
}

.eyebrow {
  margin: 0 0 12px;
  color: #9ed0ff;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-copy {
  max-width: 700px;
  margin: 0 0 26px;
  color: rgba(238, 244, 251, 0.86);
  font-size: 18px;
  line-height: 1.6;
}

.feature-list {
  display: grid;
  gap: 14px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.feature-list li {
  padding: 16px 18px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(6px);
}

.auth-column {
  display: flex;
  justify-content: flex-end;
}

.auth-card {
  width: min(100%, 440px);
  padding: 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text-primary);
  background: var(--color-bg-surface);
  box-shadow: var(--shadow-lg);
}

.auth-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 22px;
}

.auth-tab,
.btn {
  min-height: 42px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-weight: 700;
}

.auth-tab {
  color: var(--color-text-secondary);
  background: #eef3f8;
}

.auth-tab[aria-selected="true"] {
  color: #ffffff;
  background: var(--color-accent);
}

.panel-copy {
  margin: 0 0 18px;
  color: var(--color-text-secondary);
}

.form-field {
  display: grid;
  gap: 8px;
  margin: 0 0 16px;
  color: var(--color-text-secondary);
  font-size: 14px;
  font-weight: 600;
}

.form-field input {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.form-error {
  min-height: 20px;
  margin: 0 0 14px;
  color: #bf2f2f;
  font-size: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  cursor: pointer;
}

.btn-primary {
  width: 100%;
  color: #ffffff;
  background: var(--color-accent);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
}

.btn-secondary {
  color: var(--color-text-primary);
  border-color: var(--color-border);
  background: var(--color-bg-surface);
}

.btn:disabled {
  cursor: wait;
  opacity: 0.66;
}

.session-banner {
  margin: 0 0 24px;
  padding: 18px;
  border-radius: var(--radius-md);
  color: #0d5e37;
  background: #dff5ea;
}

.session-actions {
  display: flex;
  gap: 12px;
  margin-top: 12px;
}

@media (max-width: 960px) {
  .landing-shell {
    grid-template-columns: 1fr;
    padding: 32px 0 40px;
  }

  .auth-column {
    justify-content: stretch;
  }
}

@media (max-width: 640px) {
  .landing-shell {
    width: min(100%, calc(100% - 28px));
    gap: 26px;
  }

  .auth-card {
    padding: 22px;
  }

  .session-actions {
    flex-direction: column;
  }
}