/* Jitvora Gaming Optimizer — landing page
   Editorial dark product design system. No frameworks.
   Six numbered visual chapters, each with its own composition.
   Sections: tokens · base · texture · nav · buttons · chapter frame ·
   hero · performance · network · safety · trust · download · faq ·
   footer · lang · motion · responsive */

:root {
  --bg: #050609;
  --bg-2: #070810;
  --bg-3: #04050a;
  --bg-elev: #0b0d14;
  --surface: rgba(255, 255, 255, 0.028);
  --surface-2: rgba(255, 255, 255, 0.05);
  --surface-strong: rgba(255, 255, 255, 0.07);
  --hairline: rgba(255, 255, 255, 0.08);
  --hairline-strong: rgba(255, 255, 255, 0.15);
  --text: #f5f6f9;
  --text-secondary: #bcc0cb;
  --muted: #868c9c;
  --faint: #5c616f;
  --accent: #2aa3ff;
  --accent-strong: #5cc0ff;
  --accent-deep: #1b6fd6;
  --accent-ink: #051018;
  --ok: #45d67a;
  --ok-soft: rgba(69, 214, 122, 0.14);
  --warn: #f5b544;

  --radius-xl: 26px;
  --radius-lg: 20px;
  --radius: 15px;
  --radius-sm: 10px;

  --max: 1200px;
  --max-narrow: 720px;
  --nav-h: 60px;

  --ease: cubic-bezier(0.32, 0.72, 0, 1);
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);

  --shadow-lift: 0 1px 0 rgba(255, 255, 255, 0.04) inset,
                 0 22px 60px -28px rgba(0, 0, 0, 0.9);
  --shadow-float: 0 0 0 1px rgba(0, 0, 0, 0.55),
                  0 2px 0 rgba(255, 255, 255, 0.04) inset,
                  0 34px 80px -30px rgba(0, 0, 0, 0.9),
                  0 70px 150px -60px rgba(20, 95, 215, 0.4);

  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI Variable Display",
          "Segoe UI", system-ui, Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "SFMono-Regular", "Cascadia Mono", "Segoe UI Mono",
          "Roboto Mono", Menlo, Consolas, monospace;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 1rem);
  overflow-x: clip;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  overflow-x: clip;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: rgba(42, 163, 255, 0.32); color: #fff; }

a { color: var(--accent-strong); text-decoration: none; }
a:hover { color: #97d5ff; }

img { max-width: 100%; height: auto; }

h1, h2, h3 { text-wrap: balance; }
p { text-wrap: pretty; }

.page { position: relative; z-index: 1; }

/* Layered ambient background — deep, quiet, blue-lit toward the top */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(120rem 52rem at 50% -20rem, rgba(38, 120, 255, 0.13), transparent 58%),
    radial-gradient(70rem 46rem at 92% 8rem, rgba(58, 96, 210, 0.08), transparent 55%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 60%, var(--bg) 100%);
}

/* Subtle film grain for texture — kept very faint */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.035;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

:focus-visible {
  outline: 2px solid var(--accent-strong);
  outline-offset: 3px;
  border-radius: 4px;
}

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ————— Nav ————— */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(7, 8, 12, 0.66);
  -webkit-backdrop-filter: saturate(1.7) blur(22px);
  backdrop-filter: saturate(1.7) blur(22px);
  border-bottom: 1px solid var(--hairline);
}

.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  height: 100%;
  padding: 0 1.35rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav-logo { display: flex; align-items: center; gap: 0.65rem; color: var(--text); }
.nav-logo-mark { width: 30px; height: 30px; border-radius: 8px; }
.nav-logo-copy { display: flex; flex-direction: column; line-height: 1.1; }
.nav-logo-name { font-weight: 700; font-size: 0.98rem; letter-spacing: -0.01em; }
.nav-logo-tag { font-size: 0.68rem; color: var(--muted); letter-spacing: 0.02em; }

.nav-links { display: flex; align-items: center; gap: 1.7rem; }
.nav-links a {
  color: var(--text-secondary);
  font-size: 0.86rem;
  transition: color 0.18s var(--ease);
}
.nav-links a:hover { color: var(--text); }

.nav-actions { display: flex; align-items: center; gap: 0.85rem; }

.nav-mobile { display: none; }

.nav-mobile summary {
  width: 2.55rem;
  height: 2.55rem;
  display: grid;
  place-items: center;
  list-style: none;
  cursor: pointer;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid var(--hairline);
  border-radius: 50%;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.nav-mobile summary::-webkit-details-marker { display: none; }
.nav-mobile summary:hover,
.nav-mobile[open] summary {
  color: var(--text);
  border-color: rgba(92, 192, 255, 0.34);
  background: rgba(42, 163, 255, 0.1);
}

.nav-mobile-panel {
  position: fixed;
  z-index: 110;
  top: calc(var(--nav-h) + 0.55rem);
  inset-inline: max(1rem, calc((100vw - var(--max)) / 2));
  padding: 0.65rem;
  background: rgba(10, 12, 18, 0.97);
  -webkit-backdrop-filter: saturate(1.5) blur(24px);
  backdrop-filter: saturate(1.5) blur(24px);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-lg);
  box-shadow: 0 28px 70px -28px rgba(0, 0, 0, 0.95);
}

.nav-mobile-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.35rem;
}

.nav-mobile-links a {
  min-height: 2.85rem;
  display: flex;
  align-items: center;
  padding: 0.7rem 0.85rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: color 0.18s var(--ease), background 0.18s var(--ease);
}

.nav-mobile-links a:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
}

.nav-mobile-lang {
  margin-top: 0.5rem;
  padding: 0.75rem 0.85rem 0.25rem;
  border-top: 1px solid var(--hairline);
}

.nav-mobile-lang .lang-switch { align-items: flex-start; }
.nav-mobile-lang .lang-switch-row { justify-content: flex-start; }

/* ————— Buttons ————— */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.4rem;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.005em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease),
              border-color 0.2s var(--ease), color 0.2s var(--ease),
              box-shadow 0.2s var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0) scale(0.985); }

.btn-primary {
  background: linear-gradient(180deg, var(--accent-strong), var(--accent));
  color: var(--accent-ink);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.3) inset,
              0 10px 26px -10px rgba(42, 140, 255, 0.7);
}
.btn-primary:hover {
  background: linear-gradient(180deg, #7ccdff, var(--accent-strong));
  color: var(--accent-ink);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.35) inset,
              0 14px 32px -10px rgba(42, 140, 255, 0.85);
}

.btn-ghost {
  background: var(--surface-2);
  color: var(--text);
  border-color: var(--hairline-strong);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}
.btn-ghost:hover { border-color: rgba(255, 255, 255, 0.32); background: var(--surface-strong); color: var(--text); }

.btn-nav { padding: 0.5rem 1.05rem; font-size: 0.84rem; }
.btn-lg { padding: 0.95rem 1.9rem; font-size: 1rem; }
.btn-icon { flex: none; }

/* ————— Chapter frame (editorial rhythm) ————— */
.section {
  position: relative;
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(4.5rem, 9vw, 8rem) 1.35rem 0;
}
.chapter { scroll-margin-top: 0; }

.section-label {
  margin: 0 0 0.7rem;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent-strong);
}

/* Oversized ghost index numeral that anchors every chapter */
.chapter-index {
  font-family: var(--font);
  font-weight: 800;
  font-size: clamp(2.6rem, 7vw, 5rem);
  line-height: 0.8;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 255, 255, 0.14);
  background: linear-gradient(180deg, rgba(92, 192, 255, 0.16), transparent 82%);
  -webkit-background-clip: text;
  background-clip: text;
  user-select: none;
}

.chapter-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(1rem, 3vw, 2.2rem);
  align-items: start;
  max-width: 68ch;
}
.chapter-head-copy { min-width: 0; }
.chapter-head h2,
.section h2 {
  margin: 0;
  font-size: clamp(2rem, 4.7vw, 3.3rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.05;
  max-width: 20ch;
}
.section-lead {
  margin: 1.1rem 0 0;
  max-width: 54ch;
  color: var(--text-secondary);
  font-size: clamp(1rem, 1.6vw, 1.16rem);
  line-height: 1.6;
}

/* ————— Chapter 01 · Hero ————— */
.hero { padding: clamp(2.6rem, 6vw, 4.5rem) 1.35rem clamp(3rem, 6vw, 5rem); }

.hero-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1.02fr;
  align-items: center;
  gap: clamp(2rem, 5vw, 4.5rem);
}

.hero-copy { min-width: 0; }

.hero-eyebrow { display: flex; align-items: center; gap: 1rem; margin-bottom: 1.4rem; }
.hero-eyebrow .chapter-index {
  font-size: clamp(2.1rem, 4vw, 3rem);
  -webkit-text-stroke: 1px rgba(255, 255, 255, 0.16);
}

.hero-badge {
  font-size: 0.76rem;
  color: var(--text-secondary);
  border: 1px solid var(--hairline);
  background: var(--surface);
  padding: 0.4rem 0.95rem;
  border-radius: 999px;
  letter-spacing: 0.01em;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.7rem, 6.2vw, 4.9rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 0.98;
  max-width: 14ch;
}
.hero-accent {
  background: linear-gradient(96deg, var(--accent-strong) 10%, #9db9ff 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  margin: 1.5rem 0 0;
  max-width: 44ch;
  font-size: clamp(1.05rem, 1.7vw, 1.24rem);
  color: var(--text-secondary);
  line-height: 1.55;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2.1rem;
}

.trust-strip {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  padding: 0;
  margin: 2.2rem 0 0;
}
.trust-strip li {
  font-size: 0.82rem;
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}
.trust-strip li::before {
  content: "";
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 10px rgba(69, 214, 122, 0.6);
  flex: none;
}

/* Hero product scene — the app as a real product with breakout fragments */
.hero-visual { position: relative; min-width: 0; }
.hero-scene { position: relative; perspective: 2000px; }

.hero-glow {
  position: absolute;
  inset: -22% -14% -26%;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(46% 44% at 55% 42%, rgba(42, 130, 255, 0.32), transparent 70%),
    radial-gradient(32% 30% at 78% 70%, rgba(90, 120, 255, 0.16), transparent 70%);
  filter: blur(8px);
}

.hero-window-back {
  position: absolute;
  z-index: 1;
  left: 50%;
  border-radius: var(--radius-lg);
  border: 1px solid var(--hairline);
  background: linear-gradient(180deg, rgba(20, 24, 34, 0.9), rgba(10, 12, 18, 0.9));
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
  pointer-events: none;
}
.hero-window-back--1 { width: 88%; height: 82%; top: -3.4%; transform: translateX(-50%) scale(0.96); opacity: 0.55; }
.hero-window-back--2 { width: 76%; height: 72%; top: -6.6%; transform: translateX(-50%) scale(0.92); opacity: 0.3; }

.appwin {
  position: relative;
  z-index: 2;
  margin: 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--hairline-strong);
  background: linear-gradient(180deg, #0e1119, #080a10);
  box-shadow: var(--shadow-float);
  overflow: hidden;
  transform-style: preserve-3d;
}
.appwin::before,
.perf-closeup::before,
.safe-scene::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  z-index: 3;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.28), transparent);
  pointer-events: none;
}

.appwin-chrome {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--hairline);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.01));
}
.appwin-dots { display: flex; gap: 6px; }
.appwin-dots span { width: 11px; height: 11px; border-radius: 50%; background: rgba(255, 255, 255, 0.15); }
.appwin-dots span:first-child { background: rgba(255, 106, 96, 0.75); }
.appwin-dots span:nth-child(2) { background: rgba(255, 189, 70, 0.72); }
.appwin-dots span:nth-child(3) { background: rgba(76, 210, 110, 0.7); }
.appwin-title { font-size: 0.76rem; color: var(--text-secondary); font-weight: 500; }
.appwin-badge {
  margin-inline-start: auto;
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-strong);
  border: 1px solid rgba(42, 163, 255, 0.28);
  background: rgba(42, 163, 255, 0.08);
  border-radius: 999px;
  padding: 0.18rem 0.6rem;
}
.appwin-chrome .appwin-pill { margin-inline-start: auto; }

.appwin-body { display: grid; grid-template-columns: 196px 1fr; text-align: start; }

.appwin-side {
  border-inline-end: 1px solid var(--hairline);
  padding: 0.9rem 0.7rem;
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.022), transparent);
  min-width: 0;
}
.appwin-brand {
  display: flex; align-items: center; gap: 0.5rem;
  font-size: 0.82rem; font-weight: 700;
  padding: 0.3rem 0.55rem 0.7rem;
}
.appwin-brand img { border-radius: 6px; }
.appwin-brand span { letter-spacing: 0.02em; }
.appwin-group {
  margin: 0.7rem 0 0.3rem;
  padding-inline: 0.6rem;
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
}
.appwin-nav {
  display: flex; align-items: center; gap: 0.55rem;
  font-size: 0.79rem;
  color: var(--muted);
  padding: 0.38rem 0.6rem;
  border-radius: 8px;
}
.appwin-nav::before {
  content: "";
  width: 14px; height: 14px;
  border-radius: 4px;
  border: 1.5px solid currentColor;
  opacity: 0.5;
  flex: none;
}
.appwin-nav--active {
  color: var(--text);
  background: linear-gradient(90deg, rgba(42, 163, 255, 0.2), rgba(42, 163, 255, 0.05));
  box-shadow: inset 2px 0 0 var(--accent);
}
.appwin-nav--active::before { color: var(--accent-strong); opacity: 1; }

.appwin-main { padding: 1.1rem; display: flex; flex-direction: column; gap: 0.85rem; min-width: 0; }

.appwin-tiles { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.7rem; }
.appwin-tile {
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.012));
  padding: 0.7rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.28rem;
  min-width: 0;
}
.appwin-tile-k { font-size: 0.6rem; letter-spacing: 0.09em; text-transform: uppercase; color: var(--faint); }
.appwin-tile-v {
  font-size: 1.02rem; font-weight: 700; letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums; white-space: nowrap;
}
.appwin-tile-v.ok { color: var(--ok); }
.appwin-tile-s { font-size: 0.66rem; color: var(--muted); display: flex; align-items: center; gap: 0.3rem; }
.appwin-tile-s.ok { color: var(--ok); }
.appwin-tile-s.ok::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--ok); box-shadow: 0 0 8px rgba(69, 214, 122, 0.7); flex: none;
}

.appwin-graphcard {
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  background:
    radial-gradient(24rem 10rem at 8% 0%, rgba(42, 130, 255, 0.1), transparent 70%),
    rgba(255, 255, 255, 0.018);
  padding: 0.85rem 0.95rem 0.7rem;
}
.appwin-graphcard-head {
  display: flex; align-items: center; justify-content: space-between;
  font-size: 0.76rem; color: var(--text-secondary); margin-bottom: 0.5rem;
}
.appwin-pill {
  display: inline-flex; align-items: center; gap: 0.34rem;
  font-size: 0.64rem; letter-spacing: 0.05em; text-transform: uppercase; color: var(--ok);
}
.appwin-pill::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--ok); box-shadow: 0 0 8px rgba(69, 214, 122, 0.8); flex: none;
}
.appwin-graph { display: block; width: 100%; height: auto; color: var(--accent-strong); }
.appwin-graph-line { stroke-dasharray: 620; stroke-dashoffset: 0; }

.appwin-rowcard {
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.018);
  padding: 0.8rem 0.95rem;
  display: flex; align-items: center; gap: 0.9rem;
}
.appwin-rowcard-icon {
  flex: none; width: 34px; height: 34px; border-radius: 9px;
  display: grid; place-items: center;
  color: var(--accent-strong);
  background: rgba(42, 163, 255, 0.1);
  border: 1px solid rgba(42, 163, 255, 0.2);
}
.appwin-rowcard-copy { min-width: 0; flex: 1; }
.appwin-rowcard-copy h3 { margin: 0 0 0.12rem; font-size: 0.86rem; font-weight: 650; }
.appwin-rowcard-copy p { margin: 0; font-size: 0.74rem; color: var(--muted); }
.appwin-track { margin-top: 0.6rem; height: 5px; border-radius: 999px; background: rgba(255, 255, 255, 0.08); overflow: hidden; }
.appwin-track span { display: block; width: 68%; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--accent), var(--accent-strong)); }

/* Breakout fragments floating past the window edges */
.hero-frag {
  position: absolute;
  z-index: 4;
  border-radius: 13px;
  border: 1px solid var(--hairline-strong);
  background: linear-gradient(180deg, rgba(22, 27, 38, 0.92), rgba(12, 15, 22, 0.92));
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  box-shadow: 0 20px 44px -20px rgba(0, 0, 0, 0.85), 0 1px 0 rgba(255, 255, 255, 0.08) inset;
}
.hero-frag--ping {
  inset-inline-start: -5%;
  top: 12%;
  display: flex; align-items: center; gap: 0.55rem;
  padding: 0.6rem 0.85rem;
}
.hero-frag-icon {
  width: 26px; height: 26px; border-radius: 8px; flex: none;
  display: grid; place-items: center;
  color: var(--ok); background: var(--ok-soft); border: 1px solid rgba(69, 214, 122, 0.24);
}
.hero-frag-icon--accent { color: var(--accent-strong); background: rgba(42, 163, 255, 0.12); border-color: rgba(42, 163, 255, 0.28); }
.hero-frag-k { font-size: 0.62rem; letter-spacing: 0.09em; text-transform: uppercase; color: var(--faint); }
.hero-frag-v { font-size: 1.05rem; font-weight: 800; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.hero-frag-v small { font-size: 0.62rem; font-weight: 500; color: var(--muted); margin-inline-start: 1px; }
.hero-frag-badge {
  font-size: 0.6rem; font-weight: 700; color: var(--ok);
  background: var(--ok-soft); border-radius: 999px; padding: 0.16rem 0.5rem;
  border: 1px solid rgba(69, 214, 122, 0.2);
}
.hero-frag--fps {
  inset-inline-end: -6%;
  bottom: 8%;
  display: flex; align-items: center; gap: 0.6rem;
  padding: 0.7rem 0.9rem;
  width: 210px;
}
.hero-frag-copy { min-width: 0; flex: 1; }
.hero-frag-t { display: block; font-size: 0.78rem; font-weight: 650; margin-bottom: 0.45rem; }
.hero-frag-bar { display: block; height: 5px; border-radius: 999px; background: rgba(255, 255, 255, 0.1); overflow: hidden; }
.hero-frag-bar span { display: block; width: 72%; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--accent), var(--accent-strong)); }

.mock-note { margin: 1rem 0 0; text-align: center; font-size: 0.74rem; color: var(--faint); }

/* ————— Chapter 02 · Performance ————— */
.perf-layout {
  margin-top: clamp(2.4rem, 5vw, 3.6rem);
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(1.6rem, 4vw, 3.2rem);
  align-items: center;
}
.perf-media { min-width: 0; }

.perf-closeup {
  position: relative;
  margin: 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--hairline-strong);
  background: linear-gradient(180deg, #0e1119, #080a10);
  box-shadow: var(--shadow-float);
  overflow: hidden;
}
.perf-closeup-body { padding: 1.15rem; display: flex; flex-direction: column; gap: 0.7rem; }
.ctl-row {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.018);
}
.ctl-label { display: inline-flex; align-items: center; gap: 0.6rem; font-size: 0.86rem; font-weight: 550; color: var(--text-secondary); }
.ctl-ico { color: var(--accent-strong); display: inline-flex; flex: none; }
.ctl-val { font-size: 0.8rem; font-weight: 650; color: var(--text); }
.toggle {
  flex: none; width: 40px; height: 23px; border-radius: 999px;
  background: rgba(255, 255, 255, 0.12); position: relative;
  border: 1px solid var(--hairline);
}
.toggle span {
  position: absolute; top: 2px; inset-inline-start: 2px;
  width: 17px; height: 17px; border-radius: 50%; background: #cfd3dd;
  transition: inset-inline-start 0.3s var(--ease);
}
.toggle--on { background: linear-gradient(90deg, var(--accent-deep), var(--accent)); border-color: transparent; }
.toggle--on span { inset-inline-start: 20px; background: #fff; }

.perf-state { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; margin-top: 0.15rem; }
.state-chip {
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.018);
  padding: 0.7rem 0.85rem;
  display: flex; flex-direction: column; gap: 0.35rem;
}
.state-chip--wide { grid-column: 1 / -1; }
.state-k { font-size: 0.6rem; letter-spacing: 0.09em; text-transform: uppercase; color: var(--faint); }
.state-v { font-size: 1rem; font-weight: 700; }
.state-v.ok { color: var(--ok); }
.state-progress { height: 6px; border-radius: 999px; background: rgba(255, 255, 255, 0.08); overflow: hidden; }
.state-progress span { display: block; width: 78%; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--accent), var(--accent-strong)); }

/* Capabilities as an editorial spec list, not a grid of cards */
.cap-list { list-style: none; margin: 0; padding: 0; min-width: 0; }
.cap-list li {
  display: flex;
  gap: 0.95rem;
  padding: 1.05rem 0;
  border-top: 1px solid var(--hairline);
}
.cap-list li:last-child { border-bottom: 1px solid var(--hairline); }
.cap-ico {
  flex: none; width: 38px; height: 38px; border-radius: 11px;
  display: grid; place-items: center;
  color: var(--accent-strong);
  background: linear-gradient(180deg, rgba(42, 163, 255, 0.16), rgba(42, 163, 255, 0.05));
  border: 1px solid rgba(42, 163, 255, 0.2);
}
.cap-list strong { display: block; font-size: 0.98rem; font-weight: 650; letter-spacing: -0.01em; margin-bottom: 0.15rem; }
.cap-list span { font-size: 0.86rem; color: var(--muted); line-height: 1.5; }

/* Wide Pro banner — breaks the rhythm */
.feature-banner {
  margin-top: clamp(1.6rem, 4vw, 2.6rem);
  position: relative;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background:
    radial-gradient(40rem 16rem at 88% 120%, rgba(42, 130, 255, 0.12), transparent 60%),
    var(--surface);
  padding: 1.7rem 1.8rem;
  display: flex;
  align-items: center;
  gap: 1.3rem;
  overflow: hidden;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease), transform 0.3s var(--ease);
}
.feature-banner:hover { border-color: var(--hairline-strong); transform: translateY(-2px); }
.feature-icon {
  width: 44px; height: 44px;
  display: grid; place-items: center;
  border-radius: 12px;
  color: var(--accent-strong);
  background: linear-gradient(180deg, rgba(42, 163, 255, 0.16), rgba(42, 163, 255, 0.05));
  border: 1px solid rgba(42, 163, 255, 0.2);
  flex: none;
}
.feature-banner-copy { flex: 1; min-width: 0; }
.feature-banner-copy h3 { margin: 0 0 0.3rem; font-size: 1.08rem; font-weight: 650; }
.feature-banner-copy p { margin: 0; font-size: 0.9rem; color: var(--muted); }
.feature-preview-badge {
  flex: none;
  font-size: 0.66rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--accent-strong);
  border: 1px solid rgba(42, 163, 255, 0.3);
  border-radius: 999px;
  padding: 0.3rem 0.75rem;
  background: rgba(42, 163, 255, 0.06);
}

/* ————— Chapter 03 · Network Watch (full-bleed atmospheric scene) ————— */
.chapter--net {
  position: relative;
  margin-top: clamp(4.5rem, 9vw, 8rem);
  padding-block: clamp(4rem, 8vw, 7rem);
  overflow: hidden;
  border-block: 1px solid var(--hairline);
  background:
    radial-gradient(70rem 44rem at 80% 12%, rgba(42, 120, 255, 0.16), transparent 60%),
    radial-gradient(56rem 34rem at 6% 92%, rgba(60, 90, 210, 0.09), transparent 60%),
    linear-gradient(180deg, rgba(9, 13, 23, 0.7), rgba(5, 7, 13, 0.5));
}
.net-bg {
  position: absolute; inset: 0; z-index: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  color: rgba(92, 160, 255, 0.18);
}
.net-inner {
  position: relative;
  z-index: 1;
  max-width: var(--max);
  margin: 0 auto;
  padding-inline: 1.35rem;
}
.net-head { max-width: 74ch; }

/* Wide route across the viewport */
.net-route {
  margin-top: clamp(2.6rem, 6vw, 4.5rem);
  display: flex;
  align-items: flex-start;
  gap: clamp(0.5rem, 2vw, 1.4rem);
}
.net-node {
  flex: none;
  width: clamp(72px, 12vw, 120px);
  display: flex; flex-direction: column; align-items: center; gap: 0.55rem;
  text-align: center;
}
.net-node-dot {
  width: clamp(48px, 8vw, 68px); height: clamp(48px, 8vw, 68px);
  border-radius: 18px;
  display: grid; place-items: center;
  color: var(--text);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02));
  border: 1px solid var(--hairline-strong);
  box-shadow: 0 18px 40px -22px rgba(0, 0, 0, 0.9);
}
.net-node--dest .net-node-dot {
  color: var(--accent-strong);
  border-color: rgba(42, 163, 255, 0.45);
  background: rgba(42, 163, 255, 0.12);
  box-shadow: 0 0 0 4px rgba(42, 163, 255, 0.08), 0 18px 44px -20px rgba(42, 140, 255, 0.6);
}
.net-node-label { font-size: clamp(0.7rem, 1.4vw, 0.85rem); font-weight: 600; color: var(--text-secondary); line-height: 1.25; }
.net-link {
  position: relative;
  flex: 1;
  height: 2px;
  margin-top: clamp(23px, 4vw, 33px);
  border-radius: 2px;
  background: linear-gradient(90deg, rgba(92, 160, 255, 0.15), rgba(92, 160, 255, 0.5), rgba(92, 160, 255, 0.15));
  overflow: visible;
}
.net-link-pulse {
  position: absolute;
  top: 50%; inset-inline-start: 0;
  width: 8px; height: 8px; margin-top: -4px;
  border-radius: 50%;
  background: #d6ecff;
  box-shadow: 0 0 14px 3px rgba(140, 200, 255, 0.9);
  opacity: 0;
}

/* Diagnostics band + graph */
.net-diag {
  margin-top: clamp(2.4rem, 5vw, 3.6rem);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(14, 17, 25, 0.6), rgba(8, 10, 16, 0.6));
  box-shadow: var(--shadow-lift);
  padding: clamp(1.1rem, 3vw, 1.6rem);
}
.net-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(0.7rem, 2vw, 1.2rem); }
.net-stat {
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.018);
  padding: 0.9rem 1rem;
  display: flex; flex-direction: column; gap: 0.3rem;
}
.net-stat-k { font-size: 0.66rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--faint); }
.net-stat-v {
  font-size: clamp(1.4rem, 3vw, 1.9rem); font-weight: 800; letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums; display: flex; align-items: baseline; gap: 0.2rem;
}
.net-stat-v small { font-size: 0.7rem; font-weight: 500; color: var(--muted); }
.net-stat-s { font-size: 0.66rem; display: flex; align-items: center; gap: 0.32rem; color: var(--muted); }
.net-stat-s::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--ok); flex: none; }
.net-stat--good .net-stat-v { color: var(--ok); }

.net-graphwrap {
  margin-top: clamp(0.9rem, 2vw, 1.2rem);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  background:
    radial-gradient(30rem 12rem at 6% 0%, rgba(42, 130, 255, 0.1), transparent 70%),
    rgba(255, 255, 255, 0.015);
  padding: 0.9rem 1rem 0.6rem;
}
.net-graph { display: block; width: 100%; height: clamp(72px, 12vw, 120px); color: var(--accent-strong); }
.net-graph-line { stroke-dasharray: 900; stroke-dashoffset: 0; }
.net-caption { margin: 1rem 0 0; font-size: 0.74rem; color: var(--faint); }

.net-points {
  list-style: none;
  margin: clamp(2.4rem, 5vw, 3.4rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.2rem, 3vw, 2.2rem);
}
.net-points li { display: flex; gap: 0.9rem; }
.net-point-icon {
  flex: none; width: 36px; height: 36px; border-radius: 10px;
  display: grid; place-items: center;
  color: var(--accent-strong);
  background: linear-gradient(180deg, rgba(42, 163, 255, 0.16), rgba(42, 163, 255, 0.05));
  border: 1px solid rgba(42, 163, 255, 0.2);
}
.net-points strong { display: block; font-size: 0.98rem; font-weight: 650; margin-bottom: 0.15rem; }
.net-points span { font-size: 0.87rem; color: var(--muted); line-height: 1.5; }

/* ————— Chapter 04 · Safety (calm precision) ————— */
/* Calm green atmosphere set on the section itself (its ::before/::after carry the chapter seam) */
.chapter--safe {
  position: relative;
  background: radial-gradient(64rem 36rem at 18% 10%, rgba(69, 214, 122, 0.055), transparent 60%);
}
.safe-layout {
  margin-top: clamp(2.4rem, 5vw, 3.6rem);
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(1.8rem, 4vw, 3.4rem);
  align-items: center;
}
.safe-media { min-width: 0; }
.safe-scene {
  position: relative;
  margin: 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--hairline-strong);
  background: linear-gradient(180deg, #0d1017, #08090f);
  box-shadow: var(--shadow-float);
  overflow: hidden;
}
.safe-scene-body { padding: 1.2rem; display: flex; flex-direction: column; gap: 1rem; }
.safe-scene-note { margin: 0; font-size: 0.84rem; color: var(--text-secondary); line-height: 1.5; }

.safe-flow { display: flex; align-items: center; gap: 0.5rem; }
.safe-flow-step { display: inline-flex; align-items: center; gap: 0.4rem; font-size: 0.74rem; color: var(--muted); }
.safe-flow-dot {
  width: 14px; height: 14px; border-radius: 50%;
  border: 1.5px solid var(--hairline-strong); flex: none;
}
.safe-flow-step.is-done .safe-flow-dot { background: var(--ok); border-color: var(--ok); box-shadow: 0 0 10px rgba(69, 214, 122, 0.5); }
.safe-flow-step.is-done { color: var(--text-secondary); }
.safe-flow-step.is-active .safe-flow-dot { border-color: var(--accent-strong); box-shadow: 0 0 0 3px rgba(42, 163, 255, 0.16); }
.safe-flow-step.is-active { color: var(--text); font-weight: 600; }
.safe-flow-line { flex: 1; height: 1px; background: linear-gradient(90deg, var(--hairline-strong), var(--hairline)); }

.safe-rows { display: flex; flex-direction: column; gap: 0.5rem; }
.safe-scene-row {
  display: flex; align-items: center; gap: 0.7rem;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.018);
  font-size: 0.84rem; color: var(--text-secondary);
}
.safe-scene-row > span:nth-child(2) { flex: 1; min-width: 0; }
.safe-check {
  flex: none; width: 20px; height: 20px; border-radius: 6px;
  display: grid; place-items: center;
  color: var(--ok); background: var(--ok-soft); border: 1px solid rgba(69, 214, 122, 0.24);
}
.safe-dot { flex: none; width: 14px; height: 14px; border-radius: 50%; border: 1.5px solid var(--hairline-strong); }
.safe-scene-row--muted { color: var(--muted); }
.safe-row-tag {
  flex: none; font-size: 0.62rem; letter-spacing: 0.04em; text-transform: uppercase;
  color: var(--faint); border: 1px solid var(--hairline); border-radius: 999px; padding: 0.14rem 0.5rem;
}
.safe-actions { display: flex; gap: 0.6rem; justify-content: flex-end; }
.safe-btn { font-size: 0.78rem; font-weight: 600; border-radius: 999px; padding: 0.5rem 1.1rem; }
.safe-btn--ghost { color: var(--text-secondary); border: 1px solid var(--hairline-strong); }
.safe-btn--primary { color: var(--accent-ink); background: linear-gradient(180deg, var(--accent-strong), var(--accent)); box-shadow: 0 8px 20px -10px rgba(42, 140, 255, 0.7); }

/* Guarantees — hairline spec list */
.safety-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 0; }
.safety-list li {
  display: flex; gap: 0.8rem;
  padding: 1.1rem 1.1rem 1.1rem 0;
  border-top: 1px solid var(--hairline);
}
.safety-list li:nth-child(odd) { padding-inline-end: 1.4rem; }
.safety-list li:nth-child(even) { padding-inline-start: 1.4rem; border-inline-start: 1px solid var(--hairline); }
.safety-icon {
  flex: none; width: 30px; height: 30px;
  display: grid; place-items: center; border-radius: 9px;
  color: var(--ok); background: var(--ok-soft); border: 1px solid rgba(69, 214, 122, 0.2);
}
.safety-list strong { display: block; font-size: 0.9rem; font-weight: 650; letter-spacing: -0.005em; margin-bottom: 0.15rem; }
.safety-list span { font-size: 0.82rem; color: var(--muted); line-height: 1.5; }
.safety-list a { color: var(--text-secondary); text-decoration: underline; text-underline-offset: 2px; }
.safety-list a:hover { color: var(--text); }

/* ————— Chapter 05 · Trust (minimal, confident) ————— */
.trust-band {
  margin-top: clamp(2.4rem, 5vw, 3.6rem);
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: clamp(1.8rem, 5vw, 4rem);
  align-items: center;
  padding: clamp(2rem, 5vw, 3.4rem);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(50rem 24rem at 88% 10%, rgba(42, 122, 255, 0.12), transparent 62%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.028), rgba(255, 255, 255, 0.008));
  overflow: hidden;
}
.trust-lead-col .chapter-index { display: block; margin-bottom: 0.6rem; }
.trust-lead-col h2 { margin: 0; font-size: clamp(1.8rem, 3.6vw, 2.7rem); font-weight: 800; letter-spacing: -0.03em; line-height: 1.08; }
.trust-proof { min-width: 0; }
.trust-points { list-style: none; margin: 0 0 1.4rem; padding: 0; display: grid; gap: 0.7rem; }
.trust-points li { display: flex; align-items: center; gap: 0.7rem; font-size: 0.95rem; font-weight: 550; color: var(--text-secondary); }
.trust-point-ico {
  flex: none; width: 30px; height: 30px; border-radius: 9px;
  display: grid; place-items: center;
  color: var(--accent-strong); background: rgba(42, 163, 255, 0.1); border: 1px solid rgba(42, 163, 255, 0.2);
}
.trust-hash {
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: rgba(0, 0, 0, 0.28);
  padding: 1rem 1.1rem;
}
.trust-hash-label { display: block; font-size: 0.66rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--faint); margin-bottom: 0.5rem; }
.trust-hash-code {
  display: block;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--accent-strong);
  word-break: break-all;
  overflow-wrap: anywhere;
}
.trust-hash-links { margin-top: 0.7rem; display: flex; flex-wrap: wrap; gap: 0.4rem 1.1rem; font-size: 0.8rem; }
.trust-hash-links a { color: var(--text-secondary); text-decoration: underline; text-underline-offset: 3px; }
.trust-hash-links a:hover { color: var(--text); }

/* ————— Chapter 06 · Download finale ————— */
.chapter--download {
  position: relative;
  margin-top: clamp(4.5rem, 9vw, 8rem);
  padding-block: clamp(4.5rem, 10vw, 8.5rem);
  overflow: hidden;
  border-top: 1px solid var(--hairline);
  background:
    radial-gradient(70rem 40rem at 50% 120%, rgba(42, 122, 255, 0.2), transparent 62%),
    linear-gradient(180deg, rgba(6, 8, 14, 0), rgba(8, 12, 22, 0.6));
}
.finale { position: relative; max-width: 760px; margin: 0 auto; padding-inline: 1.35rem; text-align: center; }
.finale-glow {
  position: absolute; inset: -40% 0 auto; height: 60%;
  z-index: 0; pointer-events: none;
  background: radial-gradient(40% 60% at 50% 40%, rgba(42, 130, 255, 0.3), transparent 70%);
  filter: blur(10px);
}
.finale-inner { position: relative; z-index: 1; display: flex; flex-direction: column; align-items: center; }
.finale-inner .chapter-index { margin-bottom: 1.2rem; }
.finale-icon {
  width: 84px; height: 84px; margin-bottom: 1.5rem;
  border-radius: 22px;
  display: grid; place-items: center;
  background: linear-gradient(180deg, rgba(42, 163, 255, 0.2), rgba(42, 163, 255, 0.04));
  border: 1px solid rgba(42, 163, 255, 0.32);
  box-shadow: 0 20px 60px -18px rgba(42, 140, 255, 0.7);
}
.finale-icon img { width: 56px; height: 56px; border-radius: 14px; }
.chapter--download h2 { font-size: clamp(2.3rem, 6vw, 4rem); font-weight: 800; letter-spacing: -0.04em; line-height: 1; max-width: 16ch; }
.finale-meta {
  margin: 1.1rem 0 0;
  display: inline-flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 0.6rem;
  font-size: 0.86rem; color: var(--text-secondary);
}
.finale-ver {
  font-weight: 700; color: var(--accent-strong);
  border: 1px solid rgba(42, 163, 255, 0.3); border-radius: 999px; padding: 0.16rem 0.7rem;
  background: rgba(42, 163, 255, 0.08);
}
.finale-sep { color: var(--faint); }
.chapter--download .section-lead { margin-inline: auto; }
.chapter--download .download-cta { justify-content: center; }
.download-cta { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.75rem; margin-top: 2rem; }
.download-meta { margin: 1.4rem 0 0; font-size: 0.8rem; color: var(--muted); }
.download-meta a { color: var(--text-secondary); text-decoration: underline; text-underline-offset: 3px; }
.download-meta a:hover { color: var(--text); }

/* ————— FAQ ————— */
.faq-list { margin-top: 2.4rem; border-top: 1px solid var(--hairline); max-width: 74ch; }
.faq { border-bottom: 1px solid var(--hairline); }
.faq summary {
  cursor: pointer; list-style: none;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 1.2rem 0.2rem;
  font-size: 1rem; font-weight: 600; color: var(--text);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; font-size: 1.25rem; font-weight: 400; color: var(--muted);
  transition: transform 0.25s var(--ease); flex: none;
}
.faq[open] summary::after { transform: rotate(45deg); }
.faq p { margin: 0; padding: 0 0.2rem 1.2rem; font-size: 0.92rem; color: var(--text-secondary); max-width: 70ch; }

/* ————— Footer ————— */
.footer {
  margin-top: clamp(4.5rem, 9vw, 7.5rem);
  border-top: 1px solid var(--hairline);
  background: rgba(255, 255, 255, 0.012);
}
.footer-top {
  max-width: var(--max);
  margin: 0 auto;
  padding: 3.2rem 1.35rem 2.2rem;
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 2rem;
}
.footer-logo { display: flex; align-items: center; gap: 0.65rem; color: var(--text); }
.footer-logo img { border-radius: 9px; }
.footer-logo-copy { display: flex; flex-direction: column; line-height: 1.15; }
.footer-logo-name { font-weight: 700; }
.footer-logo-tag { font-size: 0.72rem; color: var(--muted); }
.footer-tagline { margin: 0.9rem 0 0; font-size: 0.84rem; color: var(--muted); }
.footer-icons { display: flex; gap: 0.8rem; margin-top: 1rem; }
.footer-icons a { color: var(--muted); }
.footer-icons a:hover { color: var(--text); }
.footer-links { display: grid; grid-template-columns: repeat(3, minmax(7rem, auto)); gap: 0.6rem 2rem; align-content: start; }
.footer-links a { font-size: 0.84rem; color: var(--text-secondary); }
.footer-links a:hover { color: var(--text); }
.footer-bottom { border-top: 1px solid var(--hairline); }
.footer-bottom-inner {
  max-width: var(--max); margin: 0 auto;
  padding: 1.15rem 1.35rem;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.footer-copy { margin: 0; font-size: 0.78rem; color: var(--muted); }
.back-top {
  width: 34px; height: 34px;
  display: grid; place-items: center; border-radius: 50%;
  border: 1px solid var(--hairline-strong); color: var(--text-secondary);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.back-top:hover { color: var(--text); border-color: rgba(255, 255, 255, 0.3); transform: translateY(-2px); }

/* ————— Language switcher (API-compatible with site-lang.js) ————— */
.lang-switch { display: flex; align-items: center; gap: 0.5rem; }
.lang-switch-label { display: none; }
.lang-switch-row { display: flex; align-items: center; gap: 0.4rem; }
.lang-switch-btns { display: flex; border: 1px solid var(--hairline-strong); border-radius: 999px; overflow: hidden; }
.lang-btn {
  appearance: none; border: 0; background: transparent; color: var(--muted);
  font: inherit; font-size: 0.74rem; font-weight: 600;
  padding: 0.32rem 0.7rem; cursor: pointer;
  transition: background 0.18s var(--ease), color 0.18s var(--ease);
}
.lang-btn:hover { color: var(--text-secondary); }
.lang-btn.is-active { background: rgba(255, 255, 255, 0.1); color: var(--text); }
.lang-select-more {
  appearance: none; background: transparent;
  border: 1px solid var(--hairline-strong); border-radius: 999px;
  color: var(--muted); font: inherit; font-size: 0.74rem;
  padding: 0.32rem 0.8rem; cursor: pointer; max-width: 7.5rem;
}
.lang-select-more.is-active { color: var(--text); }
.lang-select-more option { background: var(--bg-elev); color: var(--text); }
.lang-switch-note { display: none; }

/* ————— Pass 2 · editorial refinements ————— */
/* Centered seam that paces the flow between the contained chapters */
.section.chapter { position: relative; }
.section.chapter::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(60%, 240px);
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--hairline-strong), transparent);
}
.section.chapter::after {
  content: "";
  position: absolute;
  top: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px 2px rgba(42, 163, 255, 0.55);
}

/* Spec list & diagnostics gain quiet hover life */
.cap-list li { transition: background 0.25s var(--ease), padding-inline-start 0.25s var(--ease); border-radius: 10px; padding-inline: 0; }
.cap-list li:hover { background: rgba(255, 255, 255, 0.022); padding-inline-start: 0.7rem; }
.cap-list li:hover .cap-ico { border-color: rgba(42, 163, 255, 0.4); }
.cap-ico { transition: border-color 0.25s var(--ease); }
.net-stat { transition: border-color 0.25s var(--ease), transform 0.25s var(--ease); }
.net-stat:hover { border-color: var(--hairline-strong); transform: translateY(-2px); }
.trust-points li { transition: color 0.2s var(--ease); }
.trust-points li:hover { color: var(--text); }
.trust-hash { transition: border-color 0.25s var(--ease); }
.trust-hash:hover { border-color: var(--hairline-strong); }

/* Finale — monumental ghost wordmark + echoed trust pills */
.finale-ghost {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -58%);
  z-index: 0;
  font-weight: 800;
  font-size: clamp(5rem, 22vw, 17rem);
  letter-spacing: -0.05em;
  line-height: 1;
  white-space: nowrap;
  color: transparent;
  -webkit-text-stroke: 1px rgba(120, 180, 255, 0.07);
  background: linear-gradient(180deg, rgba(92, 160, 255, 0.06), transparent 70%);
  -webkit-background-clip: text;
  background-clip: text;
  pointer-events: none;
  user-select: none;
}
.finale-pills {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.5rem;
  padding: 0;
  margin: 1.8rem 0 0;
}
.finale-pills li {
  font-size: 0.8rem;
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}
.finale-pills li::before {
  content: "";
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 10px rgba(69, 214, 122, 0.6);
  flex: none;
}

/* ————— Motion ————— */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: no-preference) {
  .appwin {
    opacity: 0;
    transform: translateY(30px) rotateX(9deg) rotateY(-6deg) scale(0.975);
    transform-origin: 50% 100%;
    animation: winIn 1.2s var(--ease-out) 0.15s forwards;
  }
  @keyframes winIn { to { opacity: 1; transform: translateY(0) rotateX(0) rotateY(0) scale(1); } }

  .hero-window-back { opacity: 0; animation: backIn 1s var(--ease-out) 0.05s forwards; }
  @keyframes backIn { to { opacity: var(--o, 0.4); } }
  .hero-window-back--1 { --o: 0.55; }
  .hero-window-back--2 { --o: 0.3; }

  /* Fragments fade in (opacity) then keep a slow idle float (transform) — separate props, no conflict */
  .hero-frag { opacity: 0; animation: fragIn 0.9s var(--ease-out) forwards, fragFloat 7s ease-in-out infinite; }
  .hero-frag--ping { animation-delay: 0.85s, 1.7s; }
  .hero-frag--fps { animation-delay: 1.05s, 2s; animation-duration: 0.9s, 8.5s; }
  @keyframes fragIn { to { opacity: 1; } }
  @keyframes fragFloat { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-7px); } }

  .hero-glow { animation: glowDrift 14s ease-in-out infinite alternate; }
  @keyframes glowDrift {
    from { transform: translate3d(-1.5%, 0, 0) scale(1); opacity: 0.85; }
    to   { transform: translate3d(1.5%, 1%, 0) scale(1.06); opacity: 1; }
  }

  .appwin-graph-line { stroke-dashoffset: 620; animation: draw 2.1s var(--ease-out) 0.7s forwards; }

  .net-graph-line { stroke-dashoffset: 900; }
  .net-diag.is-visible .net-graph-line { animation: draw 2.3s var(--ease-out) 0.2s forwards; }
  @keyframes draw { to { stroke-dashoffset: 0; } }

  .state-progress span { width: 0; animation: fill 1.6s var(--ease-out) 0.4s forwards; }
  @keyframes fill { to { width: 78%; } }

  /* Slow scanning highlight sweeping down the performance close-up */
  .perf-closeup { position: relative; }
  .perf-closeup::after {
    content: "";
    position: absolute;
    inset-inline: 0;
    top: 0;
    height: 34%;
    z-index: 4;
    pointer-events: none;
    background: linear-gradient(180deg, transparent, rgba(92, 192, 255, 0.08), transparent);
    animation: perfScan 6s var(--ease-out) 1s infinite;
  }
  @keyframes perfScan {
    0% { transform: translateY(-40%); opacity: 0; }
    20% { opacity: 1; }
    80% { opacity: 1; }
    100% { transform: translateY(320%); opacity: 0; }
  }

  .finale-ghost { animation: ghostPulse 9s ease-in-out infinite alternate; }
  @keyframes ghostPulse { from { opacity: 0.55; } to { opacity: 1; } }

  /* Route pulses travel PC → Router → Server when the route reveals */
  .net-route.is-visible .net-link-pulse { animation: pulseAlong 2.8s var(--ease) infinite; }
  .net-route.is-visible .net-link-pulse--2 { animation-delay: 1.4s; }
  @keyframes pulseAlong {
    0%   { inset-inline-start: 0%; opacity: 0; }
    14%  { opacity: 1; }
    86%  { opacity: 1; }
    100% { inset-inline-start: 100%; opacity: 0; }
  }

  .net-bg-pulse { stroke-dasharray: 6 12; animation: dash 3.6s linear infinite; }
  @keyframes dash { to { stroke-dashoffset: -180; } }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn, .feature-banner, .back-top { transition: none; }
}

/* No-JS fallback: never hide content */
.no-js .reveal { opacity: 1; transform: none; }

/* ————— Responsive ————— */
@media (max-width: 1040px) {
  .hero-inner { grid-template-columns: 1fr; gap: clamp(2.4rem, 6vw, 3.5rem); }
  .hero-copy { max-width: 40rem; }
  .hero h1 { max-width: 18ch; }
  .hero-visual { max-width: 640px; margin-inline: auto; width: 100%; }
  .perf-layout { grid-template-columns: 1fr; }
  .perf-media { max-width: 620px; }
  .safe-layout { grid-template-columns: 1fr; }
  .safe-media { max-width: 560px; }
  .trust-band { grid-template-columns: 1fr; }
  .net-points { grid-template-columns: 1fr; gap: 0; }
  .net-points li { padding: 1.05rem 0; border-top: 1px solid var(--hairline); }
  .net-points li:last-child { border-bottom: 1px solid var(--hairline); }
  .appwin-body { grid-template-columns: 180px 1fr; }
}

@media (max-width: 900px) {
  .nav { height: var(--nav-h); min-height: var(--nav-h); }
  .nav-inner { height: 100%; min-height: 0; flex-wrap: nowrap; padding: 0 1.35rem; }
  .nav-links,
  .nav-lang-desktop { display: none; }
  .nav-actions { flex-wrap: nowrap; gap: 0.55rem; margin-inline-start: auto; }
  .nav-mobile { display: block; }
  .safety-list { grid-template-columns: 1fr; }
  .safety-list li:nth-child(even) { padding-inline-start: 0; border-inline-start: 0; }
  .safety-list li:nth-child(odd) { padding-inline-end: 0; }
}

@media (max-width: 680px) {
  .chapter-head { grid-template-columns: 1fr; gap: 0.6rem; }
  .hero-eyebrow { flex-wrap: wrap; gap: 0.75rem; }
  .feature-banner { flex-direction: column; align-items: flex-start; text-align: start; }
  .appwin-side { display: none; }
  .appwin-body { grid-template-columns: 1fr; }
  .appwin-tiles { grid-template-columns: 1fr 1fr; }
  .hero-frag { display: none; }
  .perf-state { grid-template-columns: 1fr 1fr; }
  .net-stats { grid-template-columns: 1fr 1fr 1fr; gap: 0.5rem; }
  .net-stat { padding: 0.7rem 0.7rem; }
  .footer-links { grid-template-columns: repeat(2, minmax(7rem, auto)); }
  .hero-cta .btn { flex: 1 1 100%; }
  .download-cta .btn { flex: 1 1 100%; }
  .trust-hash-code {
    font-size: 0.68rem;
    letter-spacing: 0;
    line-height: 1.7;
  }
}

@media (max-width: 400px) {
  .nav-inner { padding: 0 1rem; gap: 0.6rem; }
  .nav-logo-tag { display: none; }
  .btn-nav { padding-inline: 0.9rem; }
  .nav-mobile-panel { inset-inline: 0.75rem; }
  .nav-mobile-links { grid-template-columns: 1fr; }
  .lang-select-more { max-width: 7rem; }
  .appwin-tiles { grid-template-columns: 1fr; }
  .net-stats { grid-template-columns: 1fr; }
  .safe-actions { flex-direction: column; }
  .safe-btn { text-align: center; }
}

/* ————— App design preview ————— */
.preview-grid {
  margin-top: clamp(2rem, 5vw, 3.2rem);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(0.9rem, 2vw, 1.4rem);
}
.preview-shot {
  margin: 0;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
  box-shadow: var(--shadow-lift);
}
.preview-shot--wide { grid-column: 1 / -1; }
.preview-shot img { display: block; width: 100%; height: auto; }
.preview-shot figcaption {
  padding: 0.6rem 0.9rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--hairline);
}
.preview-note {
  margin: 1.1rem 0 0;
  font-size: 0.8rem;
  color: var(--faint);
}
@media (max-width: 760px) {
  .preview-grid { grid-template-columns: 1fr; }
}

/* Preview — Apple-style directional slide-in + hover life */
.preview-grid .preview-shot.reveal { transform: translateY(30px); }
.preview-grid .preview-shot--wide.reveal { transform: translateY(30px) scale(0.986); }
.preview-shot:nth-of-type(2).reveal { transform: translateX(-34px); }
.preview-shot:nth-of-type(3).reveal { transform: translateX(34px); }
.preview-grid .preview-shot.reveal.is-visible { transform: none; }
.preview-shot { transition: opacity 0.75s var(--ease-out), transform 0.75s var(--ease-out),
                border-color 0.25s var(--ease), box-shadow 0.25s var(--ease); }
.preview-shot:hover { border-color: var(--accent); box-shadow: var(--shadow-float); }
.preview-shot img { transition: transform 0.4s var(--ease-out); }
.preview-shot:hover img { transform: scale(1.015); }
@media (prefers-reduced-motion: reduce) {
  .preview-grid .preview-shot.reveal { transform: none; }
  .preview-shot, .preview-shot img { transition: none; }
}