:root {
  --bg: #0a0e17;
  --bg-elevated: #10151f;
  --card: #131a27;
  --border: #232c3d;
  --text: #eef2f9;
  --text-dim: #9aa7bd;
  --accent: #4f8cff;
  --accent-2: #7c5cff;
  --accent-soft: rgba(79, 140, 255, 0.15);
  --success: #35d399;
  --danger: #ff5c72;
  --radius: 14px;
  --max-width: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
  overflow-x: hidden;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

#sky {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.site-header,
main,
.site-footer {
  position: relative;
  z-index: 1;
}

.site-header {
  padding: 20px 0;
  position: sticky;
  top: 0;
  backdrop-filter: blur(10px);
  background: rgba(10, 14, 23, 0.7);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.logo-accent {
  color: var(--accent);
}

.nav {
  display: flex;
  gap: 28px;
  flex: 1;
  justify-content: center;
}

.nav a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.15s ease;
}

.nav a:hover {
  color: var(--text);
}

.nav a.active {
  color: var(--accent);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, opacity 0.15s ease, background 0.15s ease;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
}

.btn-primary:hover {
  opacity: 0.92;
}

.btn-secondary {
  background: var(--card);
  color: var(--text);
  border-color: var(--border);
}

.btn-secondary:hover {
  border-color: var(--accent);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn-ghost:hover {
  border-color: var(--accent);
}

.hero {
  padding: 120px 0 100px;
  text-align: center;
}

.hero-inner h1 {
  font-size: clamp(2.4rem, 5vw, 4rem);
  margin: 0 0 20px;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #ffffff, #b9c6e0);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--text-dim);
  max-width: 560px;
  margin: 0 auto 36px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.features {
  padding: 80px 0;
}

.features h2,
.how h2,
.compat h2,
.activate h2,
.faq h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 48px;
  letter-spacing: -0.02em;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
}

.feature-icon {
  font-size: 1.8rem;
  margin-bottom: 14px;
}

.feature-card h3 {
  margin: 0 0 10px;
  font-size: 1.1rem;
}

.feature-card p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.95rem;
}

.how {
  padding: 80px 0;
}

.how-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.how-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  position: relative;
}

.how-index {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.how-card h3 {
  margin: 0 0 10px;
  font-size: 1.1rem;
}

.how-card p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.95rem;
}

.compat {
  padding: 60px 0 80px;
  text-align: center;
}

.compat-sub {
  color: var(--text-dim);
  margin: 0 auto 32px;
  max-width: 480px;
}

.compat-grid {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
}

.compat-item {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 12px 22px;
  font-size: 0.95rem;
  color: var(--text);
  text-decoration: none;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.compat-item:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.compat-item span:first-child {
  font-size: 1.2rem;
}

.activate {
  padding: 80px 0;
}

.activate-inner {
  max-width: 560px;
  text-align: center;
}

.activate-sub {
  color: var(--text-dim);
  margin-bottom: 32px;
}

.redeem-form {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

#code-input {
  flex: 1;
  min-width: 220px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 12px 20px;
  color: var(--text);
  font-size: 1rem;
  text-align: center;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

#code-input:focus {
  outline: none;
  border-color: var(--accent);
}

.redeem-result {
  margin-top: 24px;
  min-height: 24px;
}

.redeem-result.state-error {
  color: var(--danger);
}

.redeem-result.state-loading {
  color: var(--text-dim);
}

.result-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: left;
}

.result-card p {
  margin: 0 0 12px;
  color: var(--success);
  font-weight: 600;
}

.result-link-row {
  display: flex;
  gap: 10px;
  align-items: center;
}

.result-link-row input {
  flex: 1;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  color: var(--text);
  font-size: 0.85rem;
  min-width: 0;
}

.guide {
  text-align: left;
  margin-top: 40px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
}

.guide h3 {
  margin: 0 0 16px;
  font-size: 1.05rem;
}

.steps {
  color: var(--text-dim);
  margin: 0;
  padding-left: 20px;
}

.steps li {
  margin-bottom: 10px;
}

.steps li:last-child {
  margin-bottom: 0;
}

.faq {
  padding: 80px 0 100px;
  max-width: 720px;
  margin: 0 auto;
}

.faq details {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 22px;
  margin-bottom: 12px;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
}

.faq p {
  color: var(--text-dim);
  margin: 12px 0 0;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  color: var(--text-dim);
  font-size: 0.9rem;
  text-align: center;
}

@media (max-width: 720px) {
  .nav {
    display: none;
  }
}