:root {
  --bg: #080b10;
  --bg-alt: #0d1118;
  --surface: #121820;
  --border: #1e2a38;
  --text: #e6edf5;
  --muted: #8b9cb3;
  --accent: #3dff9a;
  --accent-dim: #1a9d5c;
  --cyan: #5eead4;
  --danger: #ff6b6b;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: "Cascadia Code", "Consolas", "SF Mono", monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--cyan);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.grid-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(61, 255, 154, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(61, 255, 154, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black, transparent);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  background: rgba(8, 11, 16, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  text-decoration: none;
}

.logo-icon {
  color: var(--accent);
  font-family: var(--mono);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.site-nav a {
  color: var(--muted);
  font-size: 0.92rem;
  text-decoration: none;
}

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

.nav-admin {
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--accent) !important;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  cursor: pointer;
}

.hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 4rem 2rem 5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-kicker {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0 0 1rem;
}

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

.hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.15;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.hero-sub {
  color: var(--muted);
  font-size: 1.1rem;
  margin: 0 0 1.75rem;
  max-width: 34rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.hero-note {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
  margin: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.25rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #041208;
  box-shadow: 0 0 24px rgba(61, 255, 154, 0.25);
}

.btn-primary:hover {
  box-shadow: 0 0 32px rgba(61, 255, 154, 0.4);
}

.btn-primary.disabled {
  opacity: 0.45;
  pointer-events: none;
  box-shadow: none;
}

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

.btn-lg {
  padding: 0.85rem 1.75rem;
  font-size: 1rem;
}

.hero-demo {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.45);
}

.phone-status {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 1rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
}

.demo-terminal {
  padding: 0;
}

.term-bar {
  padding: 0.4rem 1rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--accent);
  background: rgba(61, 255, 154, 0.06);
  border-bottom: 1px solid var(--border);
}

.term-body {
  margin: 0;
  padding: 1rem 1.25rem 1.5rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.7;
  color: #b8c5d6;
  overflow-x: auto;
}

.section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

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

.section-alt > * {
  max-width: 1100px;
  margin-left: auto;
  margin-right: auto;
}

.section-label {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--accent-dim);
  margin: 0 0 0.5rem;
}

.section h2 {
  font-size: 2rem;
  margin: 0 0 0.5rem;
}

.section-desc {
  color: var(--muted);
  margin: 0 0 2.5rem;
}

.cap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.cap-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
}

.cap-num {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--muted);
}

.cap-card h3 {
  margin: 0.5rem 0 0.75rem;
  font-size: 1.15rem;
}

.cap-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1.25rem;
}

.steps li {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  padding: 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.step-n {
  flex-shrink: 0;
  width: 2.25rem;
  height: 2.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(61, 255, 154, 0.12);
  color: var(--accent);
  font-weight: 700;
  font-family: var(--mono);
}

.steps h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
}

.steps p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.download-box {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: center;
  padding: 2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.download-list {
  margin: 1rem 0 0;
  padding-left: 1.25rem;
  color: var(--muted);
}

.download-action {
  text-align: center;
}

.download-btn-wrap {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
}

.apk-hint {
  margin: 0.75rem 0 0;
  font-size: 0.85rem;
  max-width: 280px;
}

.apk-qr-popover {
  position: absolute;
  z-index: 200;
  padding: 0.85rem;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.45);
  pointer-events: auto;
}

.apk-qr-popover-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.65rem;
}

.apk-qr-box {
  width: 168px;
  height: 168px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.apk-qr-box img,
.apk-qr-box canvas {
  display: block;
}

.apk-qr-tip {
  margin: 0;
  max-width: 12rem;
  text-align: center;
  font-size: 0.82rem;
  line-height: 1.45;
  color: #334155;
}

.apk-download-btn.disabled {
  opacity: 0.55;
  pointer-events: none;
  cursor: not-allowed;
}

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

.faq-list {
  display: grid;
  gap: 0.75rem;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.25rem 1.25rem;
}

.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  padding: 0.85rem 0;
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item p {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.faq-item code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: rgba(0, 0, 0, 0.3);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
}

.cta {
  text-align: center;
  padding: 5rem 2rem;
  border-top: 1px solid var(--border);
}

.cta h2 {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
}

.cta p {
  color: var(--muted);
  margin: 0 0 1.5rem;
}

.cta .hero-actions {
  justify-content: center;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 2rem 1.5rem;
  background: var(--bg-alt);
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto 1.5rem;
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

.footer-inner p {
  max-width: 28rem;
  font-size: 0.9rem;
  margin: 0.5rem 0 0;
}

.footer-links {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
}

.footer-links a {
  color: var(--muted);
  font-size: 0.9rem;
}

.copyright {
  text-align: center;
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0;
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    padding-top: 2.5rem;
  }

  .cap-grid {
    grid-template-columns: 1fr;
  }

  .download-box {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .download-action {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 640px) {
  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem 1.25rem;
  }

  .site-nav.open {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

  .site-header {
    position: relative;
    flex-wrap: wrap;
  }
}