:root {
  color-scheme: dark;
  --bg: #08111f;
  --bg-accent: #13233f;
  --panel: rgba(8, 18, 35, 0.88);
  --panel-soft: rgba(255, 255, 255, 0.04);
  --line: rgba(115, 173, 255, 0.18);
  --line-strong: rgba(115, 173, 255, 0.28);
  --text: #ecf2ff;
  --muted: #9cb0d0;
  --glow: #55cfff;
  --cta-a: #7be1ff;
  --cta-b: #339dff;
  --danger: #ff6f8f;
  --success: #5ce0a1;
}

* {
  box-sizing: border-box;
}

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

body {
  font-family: "Space Grotesk", "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(85, 207, 255, 0.16), transparent 32%),
    linear-gradient(145deg, var(--bg), var(--bg-accent));
}

a {
  color: inherit;
}

.marketing-shell,
.account-shell,
.login-shell {
  width: min(96vw, 1180px);
  margin: 0 auto;
  padding: 2rem 0 4rem;
}

.hero-card,
.account-card,
.login-card {
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--panel);
  backdrop-filter: blur(16px);
  box-shadow: 0 30px 90px rgba(3, 8, 18, 0.42);
}

.hero-card {
  margin-top: min(12vh, 5rem);
  padding: clamp(1.8rem, 4vw, 3.4rem);
}

.eyebrow {
  margin: 0 0 1rem;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--glow);
}

.hero-card h1,
.login-card h1 {
  margin: 0;
  font-size: clamp(2.5rem, 7vw, 4.8rem);
  line-height: 0.96;
  max-width: 12ch;
}

.lead {
  margin: 1.3rem 0 0;
  max-width: 42rem;
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--muted);
}

.hero-actions,
.account-actions,
.login-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  min-height: 48px;
  padding: 0.9rem 1.15rem;
  border-radius: 14px;
  border: 1px solid var(--line);
  text-decoration: none;
  font-weight: 700;
  background: rgba(20, 33, 58, 0.7);
}

.btn.primary {
  color: #07111f;
  border-color: rgba(85, 207, 255, 0.32);
  background: linear-gradient(135deg, var(--cta-a), var(--cta-b));
}

.btn.danger {
  color: #ffe6ed;
  border-color: rgba(255, 111, 143, 0.32);
  background: rgba(110, 20, 44, 0.46);
}

.feature-grid,
.info-grid,
.download-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.feature-card,
.info-card,
.download-card {
  padding: 1.15rem;
  border-radius: 20px;
  border: 1px solid var(--line);
  background: var(--panel-soft);
}

.feature-card h2,
.info-card h2,
.download-card h2,
.section-card h2 {
  margin: 0 0 0.6rem;
  font-size: 1.05rem;
}

.feature-card p,
.info-card p,
.download-card p,
.section-card p,
.section-card li,
.footnote,
.meta-row {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.footnote {
  margin-top: 1.5rem;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem 0;
}

.brand-title {
  font-size: 1.4rem;
  font-weight: 700;
}

.brand-subtitle {
  color: var(--muted);
}

.account-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.95fr);
  gap: 1rem;
}

.account-card {
  padding: 1.6rem;
}

.section-card {
  margin-top: 1rem;
  padding: 1.2rem;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: var(--panel-soft);
}

.section-card:first-child {
  margin-top: 0;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.field {
  display: grid;
  gap: 0.45rem;
}

.field.full {
  grid-column: 1 / -1;
}

.field label {
  font-size: 0.9rem;
  color: var(--muted);
}

.field input,
.field textarea {
  width: 100%;
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  color: var(--text);
  background: rgba(9, 18, 34, 0.9);
}

.field textarea {
  min-height: 100px;
  resize: vertical;
}

.meta-list {
  display: grid;
  gap: 0.7rem;
}

.meta-row strong {
  display: inline-block;
  min-width: 150px;
  color: var(--text);
}

.flash-stack {
  display: grid;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.flash {
  padding: 0.95rem 1rem;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
}

.flash.success {
  border-color: rgba(92, 224, 161, 0.34);
  color: #dbffe9;
}

.flash.error {
  border-color: rgba(255, 111, 143, 0.34);
  color: #ffe5eb;
}

.flash.info {
  border-color: rgba(85, 207, 255, 0.34);
  color: #e0f7ff;
}

.login-shell {
  display: grid;
  place-items: center;
  min-height: 100vh;
}

.login-card {
  width: min(92vw, 560px);
  padding: 2rem;
}

.login-card h1 {
  font-size: clamp(2rem, 6vw, 3.5rem);
  max-width: none;
}

.login-card form {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

.login-card .footnote {
  margin-top: 1.25rem;
}

.helper-file {
  font-size: 0.96rem;
}

.obs-list {
  margin: 0;
  padding-left: 1.1rem;
}

@media (max-width: 900px) {
  .account-grid,
  .feature-grid,
  .info-grid,
  .download-grid,
  .field-grid {
    grid-template-columns: 1fr;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }
}