* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --accent: #007AFF;
  --accent-dark: #0062CC;
  --text: #1a1a1a;
  --text-secondary: #6e6e73;
  --bg: #ffffff;
  --bg-secondary: #f5f5f7;
  --border: #e0e0e5;
  --category-red: #FF3B30;
  --category-purple: #AF52DE;
  --category-blue: #007AFF;
  --category-gray: #8E8E93;
  --radius: 16px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  text-decoration: underline;
}

/* ── Nav ── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 48px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.3px;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 15px;
  color: var(--text-secondary);
  font-weight: 500;
}

.nav-links a:hover {
  color: var(--text);
  text-decoration: none;
}

/* ── Hero ── */
.hero {
  text-align: center;
  padding: 100px 24px 80px;
  max-width: 780px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  background: var(--accent);
  color: white;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(40px, 7vw, 72px);
  font-weight: 800;
  letter-spacing: -2px;
  line-height: 1.05;
  margin-bottom: 24px;
  color: var(--text);
}

.hero h1 span {
  color: var(--accent);
}

.hero p {
  font-size: clamp(17px, 2.5vw, 21px);
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0 auto 48px;
  line-height: 1.55;
}

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--text);
  color: white;
  font-size: 16px;
  font-weight: 600;
  padding: 14px 28px;
  border-radius: 100px;
  transition: transform 0.15s ease, background 0.15s ease;
}

.btn-primary:hover {
  background: #333;
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-primary svg {
  width: 20px;
  height: 20px;
  fill: white;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-secondary);
  color: var(--text);
  font-size: 16px;
  font-weight: 600;
  padding: 14px 28px;
  border-radius: 100px;
  transition: transform 0.15s ease, background 0.15s ease;
}

.btn-secondary:hover {
  background: #e8e8ed;
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-coming-soon {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 12px;
}

/* ── Screenshots ── */
.screenshots {
  background: var(--bg-secondary);
  padding: 80px 24px;
  text-align: center;
  overflow: hidden;
}

.screenshot-placeholder {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 48px;
}

.screenshot-frame {
  width: 220px;
  height: 440px;
  background: var(--border);
  border-radius: 32px;
  border: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 14px;
}

/* ── Features ── */
.features {
  padding: 100px 24px;
  max-width: 1100px;
  margin: 0 auto;
}

.section-label {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 16px;
  line-height: 1.1;
}

.section-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 540px;
  line-height: 1.55;
  margin-bottom: 64px;
}

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

.category-card {
  background: var(--bg-secondary);
  border-radius: var(--radius);
  padding: 28px;
  border: 1px solid var(--border);
}

.category-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 20px;
}

.category-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}

.category-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ── How it works ── */
.how-it-works {
  background: var(--bg-secondary);
  padding: 100px 24px;
}

.how-it-works-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  margin-top: 64px;
}

.step {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.step-number {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.5px;
}

.step h3 {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.3px;
}

.step p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ── Open source ── */
.open-source {
  padding: 100px 24px;
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.open-source-text h2 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 16px;
  line-height: 1.1;
}

.open-source-text p {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 32px;
}

.github-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  padding: 12px 22px;
  border-radius: 100px;
  transition: transform 0.15s ease;
}

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

.github-link svg {
  width: 20px;
  height: 20px;
}

.roadmap-card {
  background: var(--bg-secondary);
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--border);
}

.roadmap-card h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 20px;
}

.roadmap-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

.roadmap-item:last-child {
  border-bottom: none;
}

.roadmap-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-top: 6px;
  flex-shrink: 0;
}

.dot-done { background: #34C759; }
.dot-next { background: var(--accent); }
.dot-future { background: var(--border); border: 2px solid var(--text-secondary); }

.roadmap-item-text {
  font-size: 15px;
  font-weight: 500;
}

.roadmap-item-sub {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* ── Footer ── */
footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 40px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-left {
  font-size: 14px;
  color: var(--text-secondary);
}

.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.footer-links a {
  font-size: 14px;
  color: var(--text-secondary);
}

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

/* ── Responsive ── */
@media (max-width: 768px) {
  nav {
    padding: 16px 24px;
  }

  .nav-links {
    display: none;
  }

  .open-source {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  footer {
    padding: 32px 24px;
    flex-direction: column;
    align-items: flex-start;
  }
}