/* ============================================================================
   Design System — Marketing & Standalone Pages
   ============================================================================
   Used by: index.html (landing), learn.html, community.html
   Imports base.css for design tokens, then overrides body-overflow and adds
   a marketing-page layout system (top nav, hero, feature grid, code preview,
   footer). Designed to coexist with the in-app shell without conflict.
   ============================================================================ */

@import url('base.css');

/* ---- Override base lock so marketing pages can scroll ---- */
html, body {
  height: auto;
  min-height: 100%;
  overflow-x: hidden;
  overflow-y: auto;
}

body.page-marketing {
  background:
    radial-gradient(ellipse at 20% -10%, rgba(0, 212, 255, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 10%, rgba(170, 85, 255, 0.05) 0%, transparent 50%),
    var(--bg-primary);
  font-family: var(--font-sans);
  color: var(--text-primary);
  line-height: 1.55;
}

/* ============================================================================
   Top Navigation
   ============================================================================ */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px 28px;
  background: rgba(8, 8, 15, 0.72);
  border-bottom: 1px solid var(--border);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
}

.site-nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-bright);
  font-weight: 800;
  letter-spacing: 0.4px;
  font-size: 16px;
}

.site-nav-brand .brand-mark {
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 6px;
  background: var(--gradient-cyan);
  color: #001018;
  font-weight: 900;
  font-size: 14px;
  box-shadow: var(--shadow-glow-cyan);
}

.site-nav-brand span.accent {
  color: var(--accent-cyan);
  font-weight: 600;
}

.site-nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav-link {
  padding: 8px 14px;
  border-radius: var(--radius);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.site-nav-link:hover {
  color: var(--text-bright);
  background: rgba(255, 255, 255, 0.04);
}

.site-nav-link.active {
  color: var(--text-bright);
  background: rgba(0, 212, 255, 0.08);
}

.site-nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: var(--radius);
  background: var(--gradient-cyan);
  color: #001018;
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  box-shadow: var(--shadow-glow-cyan);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.site-nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 28px rgba(0, 212, 255, 0.35);
}

.site-nav-mobile-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  cursor: pointer;
}

/* ============================================================================
   Page Container
   ============================================================================ */

.page-wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 28px;
}

.page-wrap.narrow {
  max-width: 840px;
}

/* ============================================================================
   Hero
   ============================================================================ */

.hero {
  position: relative;
  padding: 88px 0 72px;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 1200px;
  height: 1200px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.08) 0%, transparent 55%);
  pointer-events: none;
  z-index: 0;
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px 5px 8px;
  border-radius: var(--radius-pill);
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.22);
  color: var(--accent-cyan);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.4px;
  text-transform: uppercase;
}

.hero-eyebrow .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero h1 {
  font-size: clamp(40px, 5.5vw, 64px);
  line-height: 1.05;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 18px 0 22px;
  color: var(--text-bright);
}

.hero h1 .accent {
  background: linear-gradient(120deg, var(--accent-cyan), var(--accent-purple));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lede {
  font-size: 18px;
  line-height: 1.6;
  color: var(--text-secondary);
  max-width: 520px;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

.btn-primary,
.btn-secondary,
.btn-ghost-lg {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform var(--transition-fast), background var(--transition-fast),
              box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.btn-primary {
  background: var(--gradient-cyan);
  color: #001018;
  box-shadow: var(--shadow-glow-cyan);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 32px rgba(0, 212, 255, 0.4);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--border);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.18);
}

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

.btn-ghost-lg:hover {
  color: var(--text-bright);
}

.btn-primary .kbd-chip,
.btn-secondary .kbd-chip {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.2);
}

.hero-meta {
  display: flex;
  gap: 24px;
  margin-top: 32px;
  color: var(--text-muted);
  font-size: 13px;
  flex-wrap: wrap;
}

.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.hero-meta b {
  color: var(--text-primary);
  font-weight: 600;
}

/* ---- Hero code preview ---- */

.hero-code {
  position: relative;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(0, 212, 255, 0.05) inset;
  overflow: hidden;
  font-family: var(--font-mono);
}

.hero-code::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.18), transparent 60%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.hero-code-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-tertiary);
}

.hero-code-bar .traffic {
  display: flex;
  gap: 6px;
}

.hero-code-bar .traffic span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
}

.hero-code-bar .traffic span:nth-child(1) { background: rgba(255, 51, 85, 0.6); }
.hero-code-bar .traffic span:nth-child(2) { background: rgba(255, 221, 0, 0.6); }
.hero-code-bar .traffic span:nth-child(3) { background: rgba(0, 255, 136, 0.6); }

.hero-code-bar .file {
  color: var(--text-muted);
  font-size: 12px;
  margin-left: 6px;
}

.hero-code-bar .badge {
  margin-left: auto;
  color: var(--accent-green);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.4px;
}

.hero-code pre {
  margin: 0;
  padding: 18px 20px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-primary);
  white-space: pre;
  overflow-x: auto;
}

.tok-kw  { color: var(--accent-purple); font-weight: 600; }
.tok-fn  { color: var(--accent-cyan); }
.tok-str { color: var(--accent-green); }
.tok-num { color: var(--accent-orange); }
.tok-com { color: var(--text-muted); font-style: italic; }
.tok-op  { color: #ff77aa; }

/* ============================================================================
   Section Pattern
   ============================================================================ */

.section {
  padding: 80px 0;
}

.section-tight {
  padding: 56px 0;
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 48px;
}

.section-tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: rgba(170, 85, 255, 0.1);
  border: 1px solid rgba(170, 85, 255, 0.25);
  color: var(--accent-purple);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section h2 {
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-bright);
  line-height: 1.15;
  margin-bottom: 14px;
}

.section-lede {
  color: var(--text-secondary);
  font-size: 17px;
  line-height: 1.6;
}

/* ============================================================================
   Feature Grid
   ============================================================================ */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.feature-card {
  position: relative;
  padding: 28px 24px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-med), transform var(--transition-med);
}

.feature-card:hover {
  border-color: rgba(0, 212, 255, 0.3);
  transform: translateY(-2px);
}

.feature-card .icon {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: rgba(0, 212, 255, 0.1);
  color: var(--accent-cyan);
  font-size: 20px;
  margin-bottom: 16px;
}

.feature-card.alt .icon { background: rgba(0, 255, 136, 0.1); color: var(--accent-green); }
.feature-card.alt2 .icon { background: rgba(170, 85, 255, 0.1); color: var(--accent-purple); }
.feature-card.alt3 .icon { background: rgba(255, 136, 0, 0.1); color: var(--accent-orange); }

.feature-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 8px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.6;
}

/* ============================================================================
   Steps / How it Works
   ============================================================================ */

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  position: relative;
}

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

.step-num {
  position: absolute;
  top: 16px;
  right: 18px;
  font-family: var(--font-mono);
  font-size: 36px;
  font-weight: 800;
  color: rgba(0, 212, 255, 0.18);
  line-height: 1;
}

.step-card h4 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 10px;
  max-width: 80%;
}

.step-card p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.6;
}

/* ============================================================================
   Showcase / Big code section
   ============================================================================ */

.showcase {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 56px;
  align-items: center;
}

.showcase-text h2 {
  text-align: left;
}

.showcase-list {
  list-style: none;
  margin-top: 24px;
  display: grid;
  gap: 14px;
}

.showcase-list li {
  display: flex;
  gap: 12px;
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.55;
}

.showcase-list .tick {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(0, 255, 136, 0.12);
  color: var(--accent-green);
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 13px;
}

/* ============================================================================
   Stats strip
   ============================================================================ */

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  padding: 36px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.stat {
  text-align: center;
  position: relative;
}

.stat + .stat::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10%;
  height: 80%;
  width: 1px;
  background: var(--border);
}

.stat .value {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 800;
  color: var(--text-bright);
  letter-spacing: -0.02em;
}

.stat .value .accent { color: var(--accent-cyan); }

.stat .label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-muted);
  margin-top: 6px;
}

/* ============================================================================
   CTA Band
   ============================================================================ */

.cta-band {
  margin: 64px 0;
  padding: 56px 40px;
  background:
    radial-gradient(ellipse at 80% 20%, rgba(0, 212, 255, 0.12), transparent 60%),
    radial-gradient(ellipse at 20% 80%, rgba(170, 85, 255, 0.1), transparent 60%),
    var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-band h2 {
  margin-bottom: 12px;
}

.cta-band p {
  color: var(--text-secondary);
  margin-bottom: 24px;
  font-size: 16px;
}

.cta-band-actions {
  display: inline-flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

/* ============================================================================
   Footer
   ============================================================================ */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 0 28px;
  margin-top: 40px;
}

.site-footer .footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.site-footer .brand-mini {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-muted);
  font-size: 13px;
}

.site-footer .brand-mini b {
  color: var(--text-primary);
  font-weight: 700;
  letter-spacing: 0.4px;
}

.site-footer .footer-links {
  display: flex;
  gap: 22px;
  flex-wrap: wrap;
}

.site-footer .footer-links a {
  color: var(--text-secondary);
  font-size: 13px;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.site-footer .footer-links a:hover {
  color: var(--text-bright);
}

.site-footer .footer-bottom {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 12px;
  text-align: center;
}

/* ============================================================================
   Article / Learn page typography
   ============================================================================ */

.article {
  padding: 56px 0 80px;
}

.article-header {
  text-align: center;
  margin-bottom: 48px;
}

.article-header .kicker {
  color: var(--accent-cyan);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.article-header h1 {
  font-size: clamp(32px, 4.5vw, 48px);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-bright);
  line-height: 1.1;
}

.article-header .subtitle {
  color: var(--text-secondary);
  font-size: 17px;
  margin-top: 12px;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.article h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--text-bright);
  margin: 56px 0 16px;
  letter-spacing: -0.01em;
}

.article h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--text-bright);
  margin: 32px 0 10px;
}

.article p {
  color: var(--text-primary);
  font-size: 16px;
  line-height: 1.7;
  margin-bottom: 16px;
}

.article p.muted {
  color: var(--text-secondary);
}

.article ul, .article ol {
  margin: 0 0 18px 22px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.article li { margin-bottom: 6px; }

.article code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--bg-tertiary);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--accent-cyan);
}

.article pre {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  margin: 16px 0 22px;
  overflow-x: auto;
  white-space: pre;
}

.article pre code {
  background: transparent;
  padding: 0;
  color: var(--text-primary);
  font-size: inherit;
}

.callout {
  display: flex;
  gap: 14px;
  padding: 18px 20px;
  border-radius: var(--radius-lg);
  background: rgba(0, 212, 255, 0.05);
  border: 1px solid rgba(0, 212, 255, 0.2);
  margin: 20px 0;
}

.callout .ico {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(0, 212, 255, 0.18);
  color: var(--accent-cyan);
  display: grid;
  place-items: center;
  font-weight: 800;
  font-size: 13px;
}

.callout .body {
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.6;
}

.callout .body b {
  color: var(--text-bright);
}

/* Lesson list (learn page) */

.lesson-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin: 28px 0 36px;
}

.lesson-card {
  display: block;
  padding: 22px 22px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: inherit;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.lesson-card:hover {
  border-color: rgba(0, 212, 255, 0.35);
  transform: translateY(-2px);
}

.lesson-card .lesson-meta {
  display: flex;
  gap: 10px;
  align-items: center;
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.4px;
  margin-bottom: 10px;
}

.lesson-card .lesson-meta .pill {
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  background: rgba(0, 212, 255, 0.1);
  color: var(--accent-cyan);
  font-weight: 700;
  text-transform: uppercase;
}

.lesson-card h4 {
  font-size: 16px;
  color: var(--text-bright);
  font-weight: 700;
  margin-bottom: 6px;
}

.lesson-card p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.55;
}

/* ============================================================================
   Community page
   ============================================================================ */

.community-toolbar {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
  margin: 24px 0 28px;
  padding: 16px 18px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.community-toolbar input,
.community-toolbar select {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  padding: 9px 12px;
  font-family: var(--font-sans);
  font-size: 14px;
  outline: none;
  transition: border-color var(--transition-fast);
}

.community-toolbar input:focus,
.community-toolbar select:focus {
  border-color: var(--accent-cyan);
}

.community-toolbar input {
  flex: 1;
  min-width: 200px;
}

.community-toolbar .count {
  color: var(--text-muted);
  font-size: 13px;
  margin-left: auto;
  font-family: var(--font-mono);
}

.bot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
}

.bot-card {
  padding: 18px 18px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.bot-card:hover {
  border-color: rgba(0, 212, 255, 0.3);
  transform: translateY(-2px);
}

.bot-card .top {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.bot-card .avatar {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  background: rgba(0, 212, 255, 0.15);
  color: var(--accent-cyan);
  font-weight: 800;
  font-family: var(--font-mono);
}

.bot-card.cls-brawler .avatar { background: rgba(255, 51, 85, 0.15); color: var(--accent-red); }
.bot-card.cls-ranger .avatar { background: rgba(0, 212, 255, 0.15); color: var(--accent-cyan); }
.bot-card.cls-tank .avatar { background: rgba(170, 85, 255, 0.15); color: var(--accent-purple); }
.bot-card.cls-support .avatar { background: rgba(0, 255, 136, 0.15); color: var(--accent-green); }

.bot-card .meta {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.bot-card .name {
  font-weight: 700;
  color: var(--text-bright);
  font-size: 15px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.bot-card .author {
  font-size: 12px;
  color: var(--text-muted);
}

.bot-card .desc {
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 36px;
  margin-bottom: 12px;
}

.bot-card .row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-muted);
}

.bot-card .badges {
  display: flex;
  gap: 6px;
}

.bot-card .badge {
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.community-loading,
.community-empty {
  padding: 48px 24px;
  text-align: center;
  color: var(--text-muted);
  background: var(--bg-secondary);
  border: 1px dashed var(--border);
  border-radius: var(--radius-lg);
}

.community-empty .ico {
  font-size: 36px;
  margin-bottom: 8px;
}

.community-empty h3 {
  color: var(--text-bright);
  margin-bottom: 6px;
}

/* ============================================================================
   Responsive
   ============================================================================ */

@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .feature-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .showcase { grid-template-columns: 1fr; gap: 32px; }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 24px 0; }
  .stat + .stat::before { display: none; }
  .lesson-grid { grid-template-columns: 1fr; }
  .site-nav { padding: 12px 18px; }
  .page-wrap { padding: 0 18px; }
  .hero { padding: 56px 0 48px; }
  .section { padding: 56px 0; }
}

@media (max-width: 640px) {
  .site-nav-links { display: none; }
  .site-nav-mobile-toggle { display: grid; place-items: center; }
  .site-nav-links.open {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    padding: 14px 18px;
    background: rgba(8, 8, 15, 0.96);
    border-bottom: 1px solid var(--border);
    align-items: stretch;
  }
  .site-nav-links.open .site-nav-link {
    padding: 12px 14px;
  }
}