:root {
  --bg: #ffffff;
  --bg-alt: #f6f7fb;
  --text: #1a1c23;
  --text-muted: #5b5f6e;
  --border: #e4e6ee;
  --accent: #7c3aed;
  --accent-text: #ffffff;
  --card-bg: #ffffff;
  --shadow: 0 4px 20px rgba(20, 22, 40, 0.06);

  --c1: #7c3aed;
  --c2: #ec4899;
  --c3: #f97316;
  --c4: #0ea5e9;
  --c5: #10b981;
  --c6: #eab308;

  --gradient-brand: linear-gradient(135deg, var(--c1), var(--c2) 55%, var(--c3));
  --gradient-hero: radial-gradient(circle at 15% 20%, rgba(124, 58, 237, 0.20), transparent 45%),
    radial-gradient(circle at 85% 15%, rgba(236, 72, 153, 0.20), transparent 45%),
    radial-gradient(circle at 50% 90%, rgba(249, 115, 22, 0.16), transparent 50%);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14151c;
    --bg-alt: #1b1d27;
    --text: #f0f1f6;
    --text-muted: #a3a6b8;
    --border: #2a2c3a;
    --accent: #a78bfa;
    --accent-text: #10111a;
    --card-bg: #1b1d27;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);

    --gradient-hero: radial-gradient(circle at 15% 20%, rgba(124, 58, 237, 0.30), transparent 45%),
      radial-gradient(circle at 85% 15%, rgba(236, 72, 153, 0.28), transparent 45%),
      radial-gradient(circle at 50% 90%, rgba(249, 115, 22, 0.22), transparent 50%);
  }
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

a { color: inherit; }

code {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1em 0.4em;
  font-size: 0.9em;
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  text-decoration: none;
  color: var(--text);
  margin-right: auto;
}

.brand-icon {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  padding: 3px;
  background: var(--gradient-brand);
}

.brand span {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.95rem;
}

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

.nav-ctas {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
}

/* Buttons */
.btn {
  display: inline-block;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
  padding: 10px 18px;
  font-size: 0.95rem;
  transition: opacity 0.15s ease, transform 0.15s ease;
  border: 1px solid transparent;
}

.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--gradient-brand);
  color: #ffffff;
  box-shadow: 0 6px 20px rgba(124, 58, 237, 0.35);
}

.btn-primary:hover {
  opacity: 1;
  box-shadow: 0 8px 26px rgba(236, 72, 153, 0.45);
  transform: translateY(-1px);
}

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

.btn-ghost:hover { opacity: 0.7; }

.btn-lg { padding: 13px 26px; font-size: 1rem; }

.btn-xl {
  padding: 17px 36px;
  font-size: 1.1rem;
  border-radius: 10px;
}

.btn-disabled {
  background: var(--bg-alt);
  border-color: var(--border);
  color: var(--text-muted);
  box-shadow: none;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-installed {
  background: var(--c5);
  color: #ffffff;
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.35);
  cursor: default;
  pointer-events: none;
}

.btn-installed:hover { transform: none; box-shadow: 0 6px 20px rgba(16, 185, 129, 0.35); }

/* Hero */
.hero {
  padding: 96px 24px 80px;
  text-align: center;
  background: var(--gradient-hero);
}

.hero-inner { max-width: 720px; margin: 0 auto; }

.eyebrow {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  font-weight: 700;
  color: #ffffff;
  margin: 0 0 20px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--gradient-brand);
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.15;
  margin: 0 0 20px;
  letter-spacing: -0.02em;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin: 0 0 36px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-note {
  margin: 22px 0 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Screenshot */
.screenshot-section {
  padding-top: 0;
  text-align: center;
}

.screenshot-frame {
  display: inline-block;
  padding: 6px;
  border-radius: 20px;
  background: var(--gradient-brand);
  box-shadow: 0 20px 50px rgba(124, 58, 237, 0.25);
}

.screenshot-img {
  display: block;
  max-width: 420px;
  width: 100%;
  height: auto;
  border-radius: 15px;
}

.screenshot-caption {
  margin: 20px 0 0;
  color: var(--text-muted);
  font-size: 0.92rem;
}

/* Sections */
.section {
  padding: 80px 24px;
  max-width: 1120px;
  margin: 0 auto;
}

.section-alt {
  max-width: none;
  background: var(--bg-alt);
}

.section-alt > * {
  max-width: 1120px;
  margin-left: auto;
  margin-right: auto;
}

.section h2 {
  font-size: 2rem;
  margin: 0 0 8px;
  text-align: center;
  letter-spacing: -0.01em;
  position: relative;
  display: block;
}

.section h2::after {
  content: "";
  display: block;
  width: 64px;
  height: 4px;
  border-radius: 999px;
  background: var(--gradient-brand);
  margin: 16px auto 0;
}

.section-sub {
  text-align: center;
  color: var(--text-muted);
  margin: 0 0 48px;
}

/* Steps */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.step {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-top: 3px solid transparent;
  border-radius: 14px;
  padding: 24px;
  box-shadow: var(--shadow);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.step:hover { transform: translateY(-4px); box-shadow: 0 10px 28px rgba(20, 22, 40, 0.12); }

.step:nth-child(1) { border-top-color: var(--c1); }
.step:nth-child(2) { border-top-color: var(--c2); }
.step:nth-child(3) { border-top-color: var(--c3); }
.step:nth-child(4) { border-top-color: var(--c4); }

.step-num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  margin-bottom: 14px;
  font-size: 0.9rem;
}

.step:nth-child(1) .step-num { background: var(--c1); }
.step:nth-child(2) .step-num { background: var(--c2); }
.step:nth-child(3) .step-num { background: var(--c3); }
.step:nth-child(4) .step-num { background: var(--c4); }

.step h3 { margin: 0 0 8px; font-size: 1.05rem; }
.step p { margin: 0; color: var(--text-muted); font-size: 0.92rem; }

/* Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 26px;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.feature:hover { transform: translateY(-4px); box-shadow: var(--shadow); }

.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 16px;
}

.feature:nth-child(6n+1) .feature-icon { background: color-mix(in srgb, var(--c1) 18%, transparent); }
.feature:nth-child(6n+2) .feature-icon { background: color-mix(in srgb, var(--c2) 18%, transparent); }
.feature:nth-child(6n+3) .feature-icon { background: color-mix(in srgb, var(--c3) 18%, transparent); }
.feature:nth-child(6n+4) .feature-icon { background: color-mix(in srgb, var(--c4) 18%, transparent); }
.feature:nth-child(6n+5) .feature-icon { background: color-mix(in srgb, var(--c5) 18%, transparent); }
.feature:nth-child(6n+6) .feature-icon { background: color-mix(in srgb, var(--c6) 18%, transparent); }

.feature h3 { margin: 0 0 10px; font-size: 1.05rem; }
.feature p { margin: 0; color: var(--text-muted); font-size: 0.92rem; }

/* Limitations */
.limitations {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.limitation {
  border: 1px solid var(--border);
  border-left: 4px solid transparent;
  border-radius: 14px;
  padding: 26px;
}

.limitation:nth-child(1) { border-left-color: var(--c2); }
.limitation:nth-child(2) { border-left-color: var(--c4); }

.limitation h3 { margin: 0 0 10px; font-size: 1.05rem; }
.limitation p { margin: 0; color: var(--text-muted); font-size: 0.92rem; }

/* Install */
.install-steps {
  max-width: 640px;
  margin: 0 auto 24px;
  color: var(--text-muted);
  font-size: 1rem;
  text-align: left;
}

.install-steps li { margin-bottom: 12px; }

#install { text-align: center; }

.install-section { padding-top: 80px; padding-bottom: 80px; }

.install-card {
  max-width: 560px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.install-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
}

.install-card h2 { margin: 0 0 8px; }
.install-card h2::after { margin: 16px auto 0; }

.install-subtitle {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin: 0 0 32px;
}

.install-status-note {
  min-height: 1.2em;
  margin: 14px 0 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

[data-open-btn] { margin-top: 14px; }

.dev-install {
  margin-top: 36px;
  width: 100%;
}

.dev-install summary {
  cursor: pointer;
  color: var(--text-muted);
  font-size: 0.9rem;
  text-decoration: underline;
  text-underline-offset: 3px;
  list-style: none;
}

.dev-install summary::-webkit-details-marker { display: none; }
.dev-install summary:hover { color: var(--text); }

.dev-install-body {
  margin-top: 20px;
  padding: 24px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  text-align: left;
}

.dev-install-body > p:first-child {
  margin-top: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
}

/* Legal pages */
.legal { max-width: 760px; }
.legal h2 { text-align: left; }
.legal h2::after { margin: 16px 0 0; }
.legal .section-sub { text-align: left; margin-bottom: 40px; }

.legal-body { color: var(--text-muted); font-size: 1rem; }
.legal-body h3 { color: var(--text); margin: 32px 0 12px; font-size: 1.1rem; }
.legal-body h3:first-child { margin-top: 0; }
.legal-body p { margin: 0 0 16px; }
.legal-body ul { margin: 0 0 16px; padding-left: 22px; }
.legal-body li { margin-bottom: 8px; }
.legal-body a { color: var(--accent); }

/* Footer */
.footer {
  border-top: 3px solid transparent;
  border-image: var(--gradient-brand) 1;
  padding: 28px 24px;
}

.footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-inner a { text-decoration: none; }
.footer-inner a:hover { color: var(--text); }

/* Responsive */
@media (max-width: 860px) {
  .steps { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .limitations { grid-template-columns: 1fr; }
}

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

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px;
    gap: 16px;
  }

  .steps { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .hero { padding: 64px 20px 56px; }
}