/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #1a1b1e;
  --bg2: #212228;
  --bg3: #2a2b32;
  --border: #35363f;
  --green: #7ec86e;
  --green-dim: #4a7a3e;
  --purple: #9d7cd8;
  --yellow: #e0af68;
  --red: #f7768e;
  --text: #c0caf5;
  --text-dim: #7982a9;
  --text-bright: #e0e4ff;
  --chrome-blue: #4285F4;
  --radius: 8px;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Courier New', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--green); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Layout ── */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Nav ── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(26, 27, 30, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-bright);
  text-decoration: none;
}

.nav-logo img { width: 24px; height: 24px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-links a {
  color: var(--text-dim);
  font-size: 0.875rem;
  transition: color 0.15s;
}

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

.btn-install-sm {
  background: var(--chrome-blue);
  color: #fff !important;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  transition: opacity 0.15s;
}

.btn-install-sm:hover { opacity: 0.88; text-decoration: none !important; }

/* ── Hero ── */
.hero {
  padding: 80px 0 64px;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 4px 14px;
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-bottom: 24px;
  font-family: var(--font-mono);
}

.hero-badge span { color: var(--green); }

h1 {
  font-family: var(--font-mono);
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  font-weight: 800;
  color: var(--text-bright);
  line-height: 1.15;
  margin-bottom: 16px;
}

h1 em {
  font-style: normal;
  color: var(--green);
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--text-dim);
  max-width: 540px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

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

.btn-install {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--chrome-blue);
  color: #fff;
  padding: 13px 28px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 700;
  transition: opacity 0.15s, transform 0.1s;
  box-shadow: 0 4px 20px rgba(66, 133, 244, 0.3);
}

.btn-install:hover { opacity: 0.9; transform: translateY(-1px); text-decoration: none; }

.btn-install svg { flex-shrink: 0; }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 12px 22px;
  border-radius: 8px;
  font-size: 0.95rem;
  transition: border-color 0.15s, color 0.15s;
}

.btn-ghost:hover { border-color: var(--green); color: var(--green); text-decoration: none; }

/* ── Preview ── */
.preview {
  padding: 0 0 72px;
  text-align: center;
}

.preview-window {
  display: inline-block;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
  max-width: 100%;
}

.window-bar {
  background: var(--bg3);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--border);
}

.dot { width: 12px; height: 12px; border-radius: 50%; }
.dot-red { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #27c93f; }

.window-title {
  font-size: 0.75rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
  margin-left: 8px;
}

.preview-screenshot {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ── Lesson Screenshots ── */
.lesson-shots {
  padding: 72px 0;
  background: var(--bg2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.shots-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 48px;
}

.shot {
  margin: 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.2s;
}

.shot:hover { border-color: var(--green-dim); }

.shot img {
  display: block;
  width: 100%;
  height: auto;
}

.shot figcaption {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--green);
  border-top: 1px solid var(--border);
}

/* ── Features ── */
.features {
  padding: 72px 0;
  background: var(--bg2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--green);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 10px;
  text-align: center;
}

h2 {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 700;
  color: var(--text-bright);
  text-align: center;
  margin-bottom: 12px;
}

.section-sub {
  text-align: center;
  color: var(--text-dim);
  max-width: 500px;
  margin: 0 auto 52px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color 0.2s;
}

.feature-card:hover { border-color: var(--green-dim); }

.feature-icon {
  font-size: 1.6rem;
  margin-bottom: 12px;
  display: block;
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.875rem;
  color: var(--text-dim);
  line-height: 1.6;
}

/* ── How It Works ── */
.how {
  padding: 72px 0;
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.step {
  text-align: center;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--bg3);
  border: 1px solid var(--green-dim);
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--green);
  font-size: 1rem;
  margin-bottom: 16px;
}

.step h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 8px;
}

.step p {
  font-size: 0.875rem;
  color: var(--text-dim);
  line-height: 1.6;
}

/* ── Lessons ── */
.lessons {
  padding: 72px 0;
  background: var(--bg2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.lessons-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 48px;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.lesson-row {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
}

.lesson-level {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--green);
  background: var(--bg3);
  border: 1px solid var(--green-dim);
  border-radius: 4px;
  padding: 2px 8px;
  margin-top: 2px;
}

.lesson-row h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 3px;
}

.lesson-row p {
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* ── Layouts ── */
.layouts {
  padding: 72px 0;
}

.layout-chips {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}

.layout-chip {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 20px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text);
  transition: border-color 0.15s, color 0.15s;
}

.layout-chip.featured {
  border-color: var(--green-dim);
  color: var(--green);
}

/* ── CTA Banner ── */
.cta-banner {
  padding: 72px 0;
  background: var(--bg2);
  border-top: 1px solid var(--border);
  text-align: center;
}

.cta-banner h2 { margin-bottom: 14px; }
.cta-banner p { color: var(--text-dim); margin-bottom: 32px; }

/* ── Footer ── */
footer {
  background: var(--bg);
  border-top: 1px solid var(--border);
  padding: 36px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-dim);
}

.footer-left img { width: 20px; height: 20px; opacity: 0.7; }

.footer-links {
  display: flex;
  gap: 20px;
  list-style: none;
  flex-wrap: wrap;
}

.footer-links a {
  font-size: 0.825rem;
  color: var(--text-dim);
}

.footer-links a:hover { color: var(--green); }

/* ── Responsive ── */
@media (max-width: 600px) {
  .nav-links { display: none; }
  .hero { padding: 52px 0 44px; }
  .features-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}