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

:root {
  --surface: rgba(10,10,10,0.92);
  --surface-solid: #111;
  --border: rgba(255,255,255,0.08);
  --border-mid: rgba(255,255,255,0.12);
  --text: #e8e8e8;
  --dim: #555;
  --dim2: #888;
  --accent: #E10600;
  --accent-glow: rgba(225,6,0,0.18);
  --bg: #0a0a0a;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Instrument Sans', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at 50% 20%, rgba(0,0,0,0.7) 0%, transparent 70%);
}

/* ── NAV ── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 48px;
  background: linear-gradient(to bottom, rgba(10,10,10,0.95) 60%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s;
}
nav.scrolled { border-bottom-color: var(--border); }

.nav-logo {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; font-family: 'DM Mono', monospace;
  font-size: 11px; font-weight: 500; letter-spacing: 3px;
  text-transform: uppercase; color: var(--text);
  position: relative; z-index: 1001;
}
.nav-logo-dot { width: 6px; height: 6px; background: var(--accent); border-radius: 50%; flex-shrink: 0; }
.nav-logo-sub { font-size: 9px; letter-spacing: 1.5px; color: var(--dim); margin-left: 8px; }

.nav-links {
  display: flex; align-items: center; gap: 2px;
  list-style: none;
}
.nav-links a {
  font-family: 'DM Mono', monospace; font-size: 10px;
  letter-spacing: 1.5px; text-transform: uppercase;
  color: var(--dim); text-decoration: none;
  padding: 8px 14px; transition: color 0.2s;
  border-radius: 2px;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-links a.nav-cta {
  color: var(--accent); border: 1px solid rgba(225,6,0,0.3);
  background: rgba(225,6,0,0.06);
}
.nav-links a.nav-cta:hover { background: rgba(225,6,0,0.12); }

.nav-mobile-toggle {
  display: none; background: none; border: 1px solid var(--border);
  color: var(--dim); padding: 8px 10px; cursor: pointer;
  font-family: 'DM Mono', monospace; font-size: 10px; letter-spacing: 1px;
  position: relative; z-index: 1001;
}

/* ── PAGE WRAPPER ── */
.page-content { position: relative; z-index: 1; }

/* ── SHARED SECTION ── */
section { padding: 100px 48px; position: relative; }

.section-label {
  font-family: 'DM Mono', monospace; font-size: 9px;
  letter-spacing: 3px; text-transform: uppercase;
  color: var(--accent); margin-bottom: 16px;
  display: flex; align-items: center; gap: 8px;
}
.section-label::before { content: '//'; color: var(--dim); }

.section-title {
  font-family: 'Instrument Sans', sans-serif;
  font-size: clamp(28px, 4vw, 44px); font-weight: 700;
  letter-spacing: -1px; line-height: 1.1; max-width: 620px;
  margin-bottom: 48px;
}

/* ── BUTTONS ── */
.btn-primary {
  font-family: 'DM Mono', monospace; font-size: 11px;
  font-weight: 500; letter-spacing: 2px; text-transform: uppercase;
  background: var(--accent); color: #fff; border: none;
  padding: 16px 40px; cursor: pointer;
  transition: all 0.2s; text-decoration: none;
  display: inline-flex; align-items: center; gap: 10px;
}
.btn-primary:hover { background: #ff1a17; }
.btn-primary:active { transform: scale(0.98); }

.btn-secondary {
  font-family: 'DM Mono', monospace; font-size: 11px;
  font-weight: 500; letter-spacing: 2px; text-transform: uppercase;
  background: transparent; color: var(--dim);
  border: 1px solid var(--border); border-left: none;
  padding: 16px 28px; cursor: pointer;
  transition: all 0.2s; text-decoration: none;
  display: inline-flex; align-items: center; gap: 10px;
}
.btn-secondary:hover { color: var(--text); border-color: var(--border-mid); }

/* ── CTA BAND ── */
.cta-band {
  padding: 80px 48px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  gap: 40px;
  background: linear-gradient(135deg, rgba(225,6,0,0.04) 0%, transparent 60%);
}
.cta-band-title {
  font-family: 'Instrument Sans', sans-serif;
  font-size: clamp(22px, 3vw, 34px); font-weight: 700;
  letter-spacing: -0.5px; max-width: 560px;
}

/* ── FOOTER ── */
footer {
  padding: 48px; border-top: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 20px; position: relative; z-index: 1;
}
.footer-logo {
  font-family: 'DM Mono', monospace; font-size: 10px;
  letter-spacing: 2.5px; text-transform: uppercase;
  color: var(--dim); display: flex; align-items: center; gap: 8px;
}
.footer-logo-dot { width: 5px; height: 5px; background: var(--accent); border-radius: 50%; }
.footer-links { display: flex; gap: 24px; list-style: none; }
.footer-links a {
  font-family: 'DM Mono', monospace; font-size: 10px;
  letter-spacing: 1px; color: var(--dim); text-decoration: none;
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--text); }
.footer-copy { font-family: 'DM Mono', monospace; font-size: 9px; color: #333; letter-spacing: 0.5px; }
.footer-copy a { font-family: 'DM Mono', monospace; font-size: 9px; color: var(--dim); letter-spacing: 0.5px; text-decoration: none; transition: color 0.2s; }
.footer-copy a:hover { color: var(--text); }

/* ── ANIMATIONS ── */
@keyframes slide-up {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes dash { to { stroke-dashoffset: 0; } }

/* ── TAGS ── */
.tag-new        { color: #3DDC84; border: 1px solid rgba(61,220,132,0.3);  background: rgba(61,220,132,0.06); }
.tag-fix        { color: #FFD23F; border: 1px solid rgba(255,210,63,0.3);  background: rgba(255,210,63,0.04); }
.tag-improvement{ color: #818cf8; border: 1px solid rgba(129,140,248,0.3); background: rgba(129,140,248,0.04); }

/* ── HOME: HERO ── */
.hero {
  min-height: 100vh;
  display: flex; flex-direction: column; justify-content: center;
  padding: 140px 48px 80px;
  position: relative; overflow: hidden;
}
.hero-eyebrow {
  font-family: 'DM Mono', monospace; font-size: 10px;
  letter-spacing: 3px; text-transform: uppercase;
  color: var(--accent); margin-bottom: 20px;
  display: flex; align-items: center; gap: 10px;
  animation: slide-up 0.7s ease both;
}
.hero-eyebrow::before { content: ''; width: 24px; height: 1px; background: var(--accent); }
.hero-title {
  font-family: 'Instrument Sans', sans-serif;
  font-size: clamp(44px, 7vw, 88px);
  font-weight: 700; line-height: 1.0; letter-spacing: -2px;
  max-width: 900px; margin-bottom: 28px;
  animation: slide-up 0.7s ease 0.1s both;
}
.hero-title em { font-style: normal; color: var(--accent); }
.hero-body {
  font-size: clamp(15px, 2vw, 18px); line-height: 1.7;
  color: var(--dim2); max-width: 560px; margin-bottom: 48px;
  animation: slide-up 0.7s ease 0.2s both;
}
.hero-actions {
  display: flex; align-items: center; gap: 0;
  animation: slide-up 0.7s ease 0.3s both;
}
.hero-visual {
  position: absolute; right: 48px; top: 50%; transform: translateY(-50%);
  width: min(560px, 42vw); height: auto; pointer-events: none;
  opacity: 0; animation: fade-in 0.8s ease 0.5s forwards;
  border-radius: 2px;
}

.hero-stats {
  display: flex; gap: 0; margin-top: 72px;
  border-top: 1px solid var(--border); padding-top: 40px;
  animation: slide-up 0.7s ease 0.4s both;
}
.hero-stat {
  padding: 0 48px 0 0;
  border-right: 1px solid var(--border); margin-right: 48px;
}
.hero-stat:last-child { border-right: none; }
.hero-stat-num {
  font-family: 'Instrument Sans', sans-serif;
  font-size: clamp(28px, 3.5vw, 42px); font-weight: 700;
  color: var(--text); line-height: 1; letter-spacing: -1px;
}
.hero-stat-num span { color: var(--accent); }
.hero-stat-label {
  font-family: 'DM Mono', monospace; font-size: 9px;
  letter-spacing: 2px; text-transform: uppercase;
  color: var(--dim); margin-top: 6px;
}
.scroll-indicator {
  position: absolute; bottom: 36px; left: 48px;
  display: flex; align-items: center; gap: 12px;
  font-family: 'DM Mono', monospace; font-size: 9px;
  letter-spacing: 2px; text-transform: uppercase; color: var(--dim);
  animation: fade-in 1s ease 1s both;
}
.scroll-indicator::before {
  content: ''; width: 1px; height: 32px;
  background: linear-gradient(to bottom, transparent, var(--dim));
}

/* ── FEATURES ── */
.features-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 1px; background: var(--border); border: 1px solid var(--border);
}
.feature-card { background: var(--bg); padding: 36px 32px; transition: background 0.2s; }
.feature-card:hover { background: rgba(255,255,255,0.02); }
.feature-icon { margin-bottom: 16px; display: block; }
.feature-title {
  font-family: 'Instrument Sans', sans-serif;
  font-size: 15px; font-weight: 600; margin-bottom: 10px; color: var(--text);
}
.feature-desc {
  font-family: 'DM Mono', monospace; font-size: 10px;
  color: var(--dim); line-height: 1.8; letter-spacing: 0.2px;
}

/* ── CAR TYPES ── */
.cars-section { background: rgba(255,255,255,0.01); }
.cars-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.car-card {
  border: 1px solid var(--border); padding: 32px;
  position: relative; overflow: hidden;
  transition: border-color 0.3s, transform 0.3s;
}
.car-card:hover { transform: translateY(-4px); }
.car-card.f1     { border-color: rgba(225,6,0,0.3); }
.car-card.gt3    { border-color: rgba(255,210,63,0.25); }
.car-card.motogp { border-color: rgba(129,140,248,0.25); }
.car-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; }
.car-card.f1::before     { background: var(--accent); }
.car-card.gt3::before    { background: #FFD23F; }
.car-card.motogp::before { background: #818cf8; }
.car-badge {
  font-family: 'DM Mono', monospace; font-size: 9px;
  letter-spacing: 1.5px; text-transform: uppercase;
  padding: 3px 8px; border-radius: 2px; border: 1px solid;
  display: inline-block; margin-bottom: 14px;
}
.car-card.f1 .car-badge     { color: var(--accent); border-color: rgba(225,6,0,0.35); }
.car-card.gt3 .car-badge    { color: #FFD23F;  border-color: rgba(255,210,63,0.35); }
.car-card.motogp .car-badge { color: #818cf8;  border-color: rgba(129,140,248,0.35); }
.car-name { font-family: 'Instrument Sans', sans-serif; font-size: 20px; font-weight: 700; margin-bottom: 8px; }
.car-desc { font-family: 'DM Mono', monospace; font-size: 10px; color: var(--dim); line-height: 1.8; margin-bottom: 20px; }
.car-specs { border-top: 1px solid var(--border); padding-top: 16px; }
.car-spec-row { display: flex; justify-content: space-between; padding: 4px 0; font-family: 'DM Mono', monospace; font-size: 10px; }
.car-spec-key { color: var(--dim); }
.car-spec-val { color: var(--text); font-weight: 500; }

/* ── HOW IT WORKS ── */
.steps-list { display: flex; flex-direction: column; gap: 0; max-width: 760px; }
.step {
  display: flex; gap: 32px; padding: 28px 0;
  border-bottom: 1px solid var(--border); align-items: flex-start;
}
.step:last-child { border-bottom: none; }
.step-num {
  font-family: 'DM Mono', monospace; font-size: 10px;
  letter-spacing: 2px; color: var(--accent); flex-shrink: 0;
  padding-top: 3px; min-width: 28px;
}
.step-title { font-family: 'Instrument Sans', sans-serif; font-size: 16px; font-weight: 600; margin-bottom: 6px; }
.step-desc { font-family: 'DM Mono', monospace; font-size: 10px; color: var(--dim); line-height: 1.8; }

/* ── CHANGELOG ── */
.changelog-page-hero { padding: 160px 48px 60px; }
.changelog-page-title {
  font-family: 'Instrument Sans', sans-serif;
  font-size: clamp(36px, 5vw, 64px); font-weight: 700;
  letter-spacing: -1.5px; line-height: 1.05; margin-bottom: 16px;
}
.changelog-page-sub {
  font-family: 'DM Mono', monospace; font-size: 11px;
  color: var(--dim); letter-spacing: 0.5px; line-height: 1.7; max-width: 480px;
}
.changelog-wrapper { padding: 0 48px 100px; }
.changelog-grid {
  display: grid; grid-template-columns: 220px 1fr;
  gap: 0; border: 1px solid var(--border); max-width: 980px;
}
.changelog-sidebar { border-right: 1px solid var(--border); }
.changelog-version-tab {
  display: flex; flex-direction: column; gap: 3px;
  padding: 18px 22px; border-bottom: 1px solid var(--border);
  cursor: pointer; transition: background 0.15s; position: relative;
}
.changelog-version-tab:last-child { border-bottom: none; }
.changelog-version-tab:hover { background: rgba(255,255,255,0.03); }
.changelog-version-tab.active { background: rgba(225,6,0,0.06); }
.changelog-version-tab.active::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0;
  width: 2px; background: var(--accent);
}
.changelog-tab-num {
  font-family: 'DM Mono', monospace; font-size: 12px;
  font-weight: 500; letter-spacing: 1px; color: var(--text);
}
.changelog-version-tab.active .changelog-tab-num { color: var(--accent); }
.changelog-tab-date { font-family: 'DM Mono', monospace; font-size: 9px; letter-spacing: 0.5px; color: var(--dim); }
.changelog-tab-tag {
  font-family: 'DM Mono', monospace; font-size: 8px;
  letter-spacing: 1px; text-transform: uppercase;
  padding: 1px 5px; border-radius: 2px; display: inline-block;
  margin-top: 4px; width: fit-content;
}
.changelog-body-panel { padding: 32px 36px; }
.changelog-body-panel.hidden { display: none; }
.changelog-panel-header {
  display: flex; align-items: baseline; gap: 12px;
  margin-bottom: 24px; padding-bottom: 18px; border-bottom: 1px solid var(--border);
}
.changelog-panel-ver {
  font-family: 'Instrument Sans', sans-serif;
  font-size: 26px; font-weight: 700; letter-spacing: -0.5px;
}
.changelog-panel-date { font-family: 'DM Mono', monospace; font-size: 10px; color: var(--dim); letter-spacing: 0.5px; }
.changelog-entries { list-style: none; padding: 0; }
.changelog-entries li {
  font-family: 'DM Mono', monospace; font-size: 11px; color: var(--dim);
  line-height: 1.9; padding: 8px 0 8px 22px; position: relative;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.changelog-entries li:last-child { border-bottom: none; }
.changelog-entries li::before { content: ''; position: absolute; left: 0; top: 17px; width: 6px; height: 1px; background: var(--accent); }
.changelog-entry-tag {
  display: inline-block; font-size: 8px; letter-spacing: 1px;
  text-transform: uppercase; padding: 1px 5px; border-radius: 2px;
  margin-right: 6px; vertical-align: middle; border: 1px solid;
  position: relative; top: -1px;
}

/* ── ABOUT ── */
.about-page-hero { padding: 160px 48px 80px; }
.about-page-title {
  font-family: 'Instrument Sans', sans-serif;
  font-size: clamp(36px, 5vw, 64px); font-weight: 700;
  letter-spacing: -1.5px; line-height: 1.05; margin-bottom: 24px; max-width: 800px;
}
.about-page-lead {
  font-size: 18px; line-height: 1.75; color: var(--dim2);
  max-width: 640px;
}
.about-body { padding: 0 48px 100px; }
.about-two-col {
  display: grid; grid-template-columns: 1fr 340px; gap: 80px;
  max-width: 1100px; align-items: start;
}
.about-prose h2 {
  font-family: 'Instrument Sans', sans-serif;
  font-size: 24px; font-weight: 700; letter-spacing: -0.3px;
  margin-bottom: 14px; margin-top: 48px;
}
.about-prose h2:first-child { margin-top: 0; }
.about-prose p {
  font-size: 15px; line-height: 1.85; color: var(--dim2); margin-bottom: 20px;
}
.about-prose ul { list-style: none; margin-bottom: 28px; }
.about-prose ul li {
  font-family: 'DM Mono', monospace; font-size: 11px;
  color: var(--dim2); line-height: 1.9; padding-left: 20px;
  position: relative; letter-spacing: 0.2px;
}
.about-prose ul li::before { content: '→'; position: absolute; left: 0; color: var(--accent); font-size: 10px; }
.about-sidebar { position: sticky; top: 100px; }
.about-sidebar-card {
  border: 1px solid var(--border); padding: 24px 26px; margin-bottom: 16px;
}
.about-sidebar-card-label {
  font-family: 'DM Mono', monospace; font-size: 9px; letter-spacing: 2px;
  text-transform: uppercase; color: var(--dim); margin-bottom: 14px;
  display: flex; align-items: center; gap: 8px;
}
.about-sidebar-card-label::before { content: ''; width: 3px; height: 10px; background: var(--accent); border-radius: 1px; }
.about-meta-row {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 6px 0; border-bottom: 1px solid var(--border);
}
.about-meta-row:last-child { border-bottom: none; }
.about-meta-key { font-family: 'DM Mono', monospace; font-size: 9px; color: var(--dim); }
.about-meta-val { font-family: 'DM Mono', monospace; font-size: 10px; color: var(--text); font-weight: 500; }
.about-divider { width: 48px; height: 2px; background: var(--accent); margin: 48px 0; }

/* ── BLOG ── */
.blog-hero { padding: 160px 48px 60px; }
.blog-hero-title {
  font-family: 'Instrument Sans', sans-serif;
  font-size: clamp(36px, 5vw, 64px); font-weight: 700;
  letter-spacing: -1.5px; line-height: 1.05; margin-bottom: 16px;
}
.blog-hero-sub {
  font-family: 'DM Mono', monospace; font-size: 11px;
  color: var(--dim); letter-spacing: 0.5px; line-height: 1.7; max-width: 480px;
}
.blog-body { padding: 0 48px 100px; }
.blog-featured {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1px;
  background: var(--border); border: 1px solid var(--border);
  margin-bottom: 1px;
}
.blog-card {
  background: var(--bg); padding: 36px;
  transition: background 0.2s; text-decoration: none; display: block;
}
.blog-card:hover { background: rgba(255,255,255,0.02); }
.blog-card.featured { grid-column: 1 / -1; padding: 48px; }
.blog-list {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 1px; background: var(--border); border: 1px solid var(--border); border-top: none;
}
.blog-tag {
  font-family: 'DM Mono', monospace; font-size: 8px; letter-spacing: 1.5px;
  text-transform: uppercase; padding: 2px 7px; border-radius: 2px; border: 1px solid;
  display: inline-block; margin-bottom: 16px;
}
.blog-tag.physics    { color: #818cf8; border-color: rgba(129,140,248,0.3); }
.blog-tag.design     { color: var(--accent); border-color: rgba(225,6,0,0.3); }
.blog-tag.history    { color: #FFD23F; border-color: rgba(255,210,63,0.3); }
.blog-tag.guide      { color: #3DDC84; border-color: rgba(61,220,132,0.3); }
.blog-tag.analysis   { color: #818cf8; border-color: rgba(129,140,248,0.3); }
.blog-card-title {
  font-family: 'Instrument Sans', sans-serif; font-weight: 700;
  color: var(--text); line-height: 1.2; letter-spacing: -0.3px;
  margin-bottom: 12px; text-decoration: none;
}
.blog-card.featured .blog-card-title { font-size: clamp(22px, 3vw, 32px); letter-spacing: -0.5px; max-width: 680px; }
.blog-card:not(.featured) .blog-card-title { font-size: 17px; }
.blog-card-excerpt {
  font-family: 'DM Mono', monospace; font-size: 10px;
  color: var(--dim); line-height: 1.8; margin-bottom: 20px;
}
.blog-card.featured .blog-card-excerpt { font-size: 11px; max-width: 560px; }
.blog-card-meta {
  display: flex; align-items: center; gap: 16px;
  font-family: 'DM Mono', monospace; font-size: 9px; color: var(--dim);
  letter-spacing: 0.5px;
}
.blog-card-meta-dot { width: 3px; height: 3px; background: var(--dim); border-radius: 50%; }
.blog-read-more {
  font-family: 'DM Mono', monospace; font-size: 9px; letter-spacing: 2px;
  text-transform: uppercase; color: var(--accent); text-decoration: none;
  display: inline-flex; align-items: center; gap: 6px;
  transition: gap 0.2s;
}
.blog-read-more:hover { gap: 10px; }

/* ── APP PAGE ── */
.app-header {
  padding: 100px 48px 0;
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: 40px; flex-wrap: wrap;
}
.app-header-title {
  font-family: 'Instrument Sans', sans-serif;
  font-size: clamp(28px, 4vw, 44px); font-weight: 700;
  letter-spacing: -1px; line-height: 1.1; margin-bottom: 10px;
}
.app-header-desc {
  font-family: 'DM Mono', monospace; font-size: 10px;
  color: var(--dim); letter-spacing: 0.3px; line-height: 1.7; max-width: 480px;
}
.app-btn {
  font-family: 'DM Mono', monospace; font-size: 10px;
  letter-spacing: 1px; text-transform: uppercase;
  padding: 9px 16px; cursor: pointer;
  background: rgba(255,255,255,0.04); border: 1px solid var(--border); color: var(--dim);
  transition: all 0.2s; text-decoration: none; display: inline-block;
}
.app-btn:hover { color: var(--text); border-color: var(--border-mid); }
.app-btn.accent { background: rgba(225,6,0,0.08); color: var(--accent); border-color: rgba(225,6,0,0.3); }
.app-btn.accent:hover { background: rgba(225,6,0,0.14); }
.app-frame-wrapper { margin: 28px 48px 0; border: 1px solid var(--border); background: #060606; }
.app-frame-bar {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 16px; border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
}
.app-frame-dot { width: 8px; height: 8px; border-radius: 50%; }
.app-frame-dot.red    { background: #E10600; opacity: 0.7; }
.app-frame-dot.yellow { background: #FFD23F; opacity: 0.7; }
.app-frame-dot.green  { background: #3DDC84; opacity: 0.7; }
.app-frame-url {
  font-family: 'DM Mono', monospace; font-size: 9px;
  color: var(--dim); letter-spacing: 0.5px; flex: 1; text-align: center;
}
.app-embed { width: 100%; height: 640px; border: none; display: block; }
.app-tips {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 1px; background: var(--border); border: 1px solid var(--border);
  margin: 28px 48px 48px;
}
/* When used inline on index page (no margin override) */
section .app-tips { margin: 0; }
.app-tip { background: var(--bg); padding: 20px; }
.app-tip-key {
  font-family: 'DM Mono', monospace; font-size: 9px;
  letter-spacing: 2px; text-transform: uppercase;
  color: var(--accent); margin-bottom: 6px;
  display: flex; align-items: center; gap: 6px;
}
.app-tip-key kbd {
  display: inline-block; font-family: 'DM Mono', monospace; font-size: 8px;
  color: var(--dim); border: 1px solid rgba(255,255,255,0.1);
  padding: 1px 5px; border-radius: 2px; background: rgba(255,255,255,0.04);
}
.app-tip-text { font-family: 'DM Mono', monospace; font-size: 10px; color: var(--dim); line-height: 1.7; }

/* ── MOBILE ── */
@media (max-width: 900px) {
  nav { padding: 14px 24px; }
  /* backdrop-filter creates a containing block for position:fixed children,
     clipping the open menu to the nav bar height. Remove it when open. */
  nav.menu-open { backdrop-filter: none; background: transparent; }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column; justify-content: space-evenly;
    position: fixed; top: 0; left: 0; right: 0; bottom: 0;
    background: #000;
    padding: 80px 48px;
    z-index: 1000;
  }
  .nav-links.open li {
    display: flex; align-items: stretch; flex: 1;
    border-bottom: 1px solid var(--border);
  }
  .nav-links.open li:last-child { border-bottom: none; }
  .nav-links.open a {
    padding: 0; font-size: 36px; font-family: 'Instrument Sans', sans-serif;
    font-weight: 700; letter-spacing: -0.5px; text-transform: none;
    color: var(--dim); display: flex; align-items: center; flex: 1; border: none;
  }
  .nav-links.open a:hover, .nav-links.open a.active { color: var(--text); }
  .nav-links.open a.nav-cta { color: var(--accent); background: none; border: none; }
  .nav-mobile-toggle { display: block; }

  section { padding: 72px 24px; }
  .hero { padding: 120px 24px 60px; }
  .hero-visual { display: none; }
  .hero-stats { flex-wrap: wrap; }
  .hero-stat { padding: 0 28px 0 0; margin-right: 28px; }
  .features-grid { grid-template-columns: 1fr; }
  .cars-grid { grid-template-columns: 1fr; }
  .cta-band { padding: 56px 24px; flex-direction: column; }

  .changelog-page-hero { padding: 120px 24px 40px; }
  .changelog-wrapper { padding: 0 24px 80px; }
  .changelog-grid { grid-template-columns: 1fr; }
  .changelog-sidebar {
    border-right: none; border-bottom: 1px solid var(--border);
    display: flex; overflow-x: auto;
  }
  .changelog-version-tab {
    border-bottom: none; border-right: 1px solid var(--border);
    flex-shrink: 0; min-width: 120px;
  }
  .changelog-version-tab.active::before {
    top: auto; bottom: 0; left: 0; right: 0; width: auto; height: 2px;
  }

  .about-page-hero { padding: 120px 24px 60px; }
  .about-body { padding: 0 24px 80px; }
  .about-two-col { grid-template-columns: 1fr; gap: 48px; }
  .about-sidebar { position: static; }

  .blog-hero { padding: 120px 24px 40px; }
  .blog-body { padding: 0 24px 80px; }
  .blog-featured { grid-template-columns: 1fr; }
  .blog-card.featured { grid-column: auto; padding: 28px; }
  .blog-list { grid-template-columns: 1fr; }

  .app-header { padding: 100px 24px 0; }
  .app-frame-wrapper { margin: 20px 24px 0; }
  .app-embed { height: 480px; }
  .app-tips { margin: 20px 24px 40px; grid-template-columns: 1fr 1fr; }

  footer { padding: 32px 24px; flex-direction: column; gap: 16px; }
}

/* ── BLOG: two-column list variant ── */
.blog-list-two {
  grid-template-columns: repeat(2, 1fr);
}
@media (max-width: 900px) {
  .blog-list-two { grid-template-columns: 1fr; }
}

/* ── BLOG ARTICLE PAGE ── */
.article-hero {
  padding: 160px 48px 60px;
  border-bottom: 1px solid var(--border);
}
.article-back {
  font-family: 'DM Mono', monospace; font-size: 9px;
  letter-spacing: 2px; text-transform: uppercase;
  color: var(--dim); text-decoration: none;
  display: inline-flex; align-items: center; gap: 8px;
  margin-bottom: 40px; transition: color 0.2s;
}
.article-back:hover { color: var(--text); }
.article-back::before { content: '←'; }
.article-hero-title {
  font-family: 'Instrument Sans', sans-serif;
  font-size: clamp(32px, 5vw, 62px); font-weight: 700;
  letter-spacing: -1.5px; line-height: 1.05;
  max-width: 820px; margin-bottom: 28px;
}
.article-hero-meta {
  display: flex; align-items: center; gap: 20px;
  font-family: 'DM Mono', monospace; font-size: 9px;
  color: var(--dim); letter-spacing: 0.5px;
}
.article-hero-meta-dot { width: 3px; height: 3px; background: var(--dim); border-radius: 50%; }

.article-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 80px;
  padding: 72px 48px 100px;
  max-width: 1200px;
  margin: 0 auto;
}

/* prose */
.article-prose { min-width: 0; }
.article-prose h2 {
  font-family: 'Instrument Sans', sans-serif;
  font-size: clamp(20px, 2.5vw, 28px); font-weight: 700;
  letter-spacing: -0.5px; line-height: 1.2;
  margin: 56px 0 16px; color: var(--text);
}
.article-prose h2:first-child { margin-top: 0; }
.article-prose h3 {
  font-family: 'Instrument Sans', sans-serif;
  font-size: 18px; font-weight: 600;
  letter-spacing: -0.3px; line-height: 1.3;
  margin: 36px 0 12px; color: var(--text);
}
.article-prose p {
  font-family: 'DM Mono', monospace; font-size: 13px;
  line-height: 2; color: var(--dim2);
  margin-bottom: 20px;
}
.article-prose strong { color: var(--text); font-weight: 500; }
.article-prose em { font-style: italic; color: var(--text); }
.article-divider {
  width: 48px; height: 2px;
  background: var(--accent); margin: 48px 0;
}

/* ranked list */
.article-ranked { list-style: none; margin: 0 0 20px; padding: 0; }
.article-ranked li {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 0;
  border-bottom: 1px solid var(--border);
  padding: 28px 0;
}
.article-ranked li:first-child { border-top: 1px solid var(--border); }
.article-rank-num {
  font-family: 'Instrument Sans', sans-serif;
  font-size: clamp(36px, 4vw, 52px); font-weight: 700;
  color: var(--border-mid); letter-spacing: -2px;
  line-height: 1; padding-top: 4px;
}
.article-rank-num.top { color: var(--accent); }
.article-rank-body { padding-left: 24px; }
.article-rank-title {
  font-family: 'Instrument Sans', sans-serif;
  font-size: 20px; font-weight: 700;
  letter-spacing: -0.3px; color: var(--text);
  margin-bottom: 10px;
}
.article-rank-body p {
  font-family: 'DM Mono', monospace; font-size: 12px;
  line-height: 1.9; color: var(--dim2); margin: 0;
}

/* sidebar */
.article-sidebar { position: relative; }
.article-sidebar-inner { position: sticky; top: 100px; }
.article-sidebar-card {
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border);
  padding: 24px; margin-bottom: 16px;
}
.article-sidebar-label {
  font-family: 'DM Mono', monospace; font-size: 9px;
  letter-spacing: 2px; text-transform: uppercase;
  color: var(--dim); margin-bottom: 16px;
  display: flex; align-items: center; gap: 8px;
}
.article-sidebar-label::before {
  content: ''; width: 3px; height: 10px;
  background: var(--accent); border-radius: 1px;
}
.article-sidebar-row {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 6px 0; border-bottom: 1px solid var(--border);
  font-family: 'DM Mono', monospace;
}
.article-sidebar-row:last-child { border-bottom: none; }
.article-sidebar-key { font-size: 9px; color: var(--dim); }
.article-sidebar-val { font-size: 10px; color: var(--text); font-weight: 500; }

.article-sidebar-toc { list-style: none; padding: 0; margin: 0; }
.article-sidebar-toc li { padding: 5px 0; border-bottom: 1px solid var(--border); }
.article-sidebar-toc li:last-child { border-bottom: none; }
.article-sidebar-toc a {
  font-family: 'DM Mono', monospace; font-size: 9px;
  color: var(--dim); text-decoration: none;
  letter-spacing: 0.5px; transition: color 0.2s;
  display: block;
}
.article-sidebar-toc a:hover { color: var(--text); }

.article-cta {
  background: rgba(225,6,0,0.06);
  border: 1px solid rgba(225,6,0,0.2);
  padding: 24px;
}
.article-cta-label {
  font-family: 'DM Mono', monospace; font-size: 9px;
  letter-spacing: 2px; text-transform: uppercase;
  color: var(--accent); margin-bottom: 10px;
}
.article-cta p {
  font-family: 'DM Mono', monospace; font-size: 10px;
  color: var(--dim); line-height: 1.7; margin-bottom: 16px;
}
.article-cta .btn-primary {
  font-size: 9px; padding: 10px 18px; width: 100%;
  justify-content: center; letter-spacing: 1.5px;
}

@media (max-width: 900px) {
  .article-hero { padding: 120px 24px 48px; }
  .article-layout {
    grid-template-columns: 1fr;
    gap: 48px;
    padding: 48px 24px 80px;
  }
  .article-sidebar-inner { position: static; }
  .article-ranked li { grid-template-columns: 44px 1fr; }
}