:root {
  color-scheme: dark;
  --bg: #0c0f12;
  --bg-alt: #12171b;
  --ink: #f2f3f4;
  --muted: #9aa4ad;
  --accent: #45f3a7;
  --accent-2: #7aa2ff;
  --shadow: rgba(0, 0, 0, 0.35);
  --glow: rgba(69, 243, 167, 0.25);
  --max: 1100px;
}

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

body {
  font-family: "IBM Plex Sans", "Space Grotesk", system-ui, sans-serif;
  background: radial-gradient(circle at top, #0b1116 0%, var(--bg) 55%, #080b0e 100%);
  color: var(--ink);
  line-height: 1.4;
  letter-spacing: 0.01em;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  padding: 1.2rem 6vw 0;
  backdrop-filter: blur(12px);
  background: linear-gradient(180deg, rgba(9, 12, 15, 0.9), rgba(9, 12, 15, 0.1));
}

.nav-shell {
  width: min(var(--max), 100%);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 0.8rem 1.6rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(8, 11, 14, 0.7);
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.35);
}

.logo {
  font-family: "Space Grotesk", "IBM Plex Sans", system-ui, sans-serif;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}

.logo img {
  height: 28px;
  width: auto;
  display: block;
}

.site-nav {
  display: flex;
  gap: 1.6rem;
  font-size: 0.95rem;
  color: var(--muted);
}

.site-nav a {
  position: relative;
  padding: 0.2rem 0;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 100%;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(10, 14, 18, 0.7);
  color: var(--ink);
  padding: 0.55rem 1.1rem;
  border-radius: 999px;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
}

.nav-panel {
  position: absolute;
  left: 50%;
  top: calc(100% + 0.6rem);
  width: min(var(--max), 100%);
  display: grid;
  gap: 1rem;
  padding: 1.2rem 1.6rem;
  border-radius: 24px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(8, 11, 14, 0.8);
  box-shadow: 0 24px 50px rgba(0, 0, 0, 0.4);
  transform: translate3d(-50%, -10px, 0);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.nav-panel a {
  color: var(--muted);
  font-size: 1rem;
}

.nav-panel.open {
  opacity: 1;
  transform: translate3d(-50%, 0, 0);
  pointer-events: auto;
}

main {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.grain {
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120' viewBox='0 0 120 120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)' opacity='0.05'/%3E%3C/svg%3E");
  pointer-events: none;
  mix-blend-mode: soft-light;
  z-index: 1;
}

.chapter {
  position: relative;
  padding: 10vh 6vw;
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.55;
  transform: translateY(24px);
  transition: opacity 0.8s ease, transform 0.8s ease;
  -webkit-mask-image: linear-gradient(
    180deg,
    transparent 0%,
    rgba(0, 0, 0, 0.85) 18%,
    #000 28%,
    #000 72%,
    rgba(0, 0, 0, 0.85) 82%,
    transparent 100%
  );
  mask-image: linear-gradient(
    180deg,
    transparent 0%,
    rgba(0, 0, 0, 0.85) 18%,
    #000 28%,
    #000 72%,
    rgba(0, 0, 0, 0.85) 82%,
    transparent 100%
  );
}

.chapter::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 15% 15%, rgba(122, 162, 255, 0.12), transparent 45%),
    radial-gradient(circle at 80% 35%, rgba(69, 243, 167, 0.12), transparent 50%);
  opacity: 0.8;
  z-index: 0;
  pointer-events: none;
}

.chapter.in {
  opacity: 1;
  transform: translateY(0);
}

.chapter-inner {
  position: relative;
  z-index: 2;
  width: min(var(--max), 100%);
  display: flex;
  flex-direction: column;
  gap: 2vh;
}

.glow-frame {
  position: relative;
  padding: 2.4rem 2.8rem;
  border-radius: 28px;
  background: linear-gradient(180deg, rgba(10, 14, 18, 0.7), rgba(8, 10, 13, 0.2));
  backdrop-filter: blur(6px);
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.35);
  overflow: hidden;
}

.glow-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(120deg, rgba(69, 243, 167, 0.6), rgba(122, 162, 255, 0.25), transparent);
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask-composite: exclude;
  pointer-events: none;
}

.glow-frame::after {
  content: "";
  position: absolute;
  inset: -30%;
  background: radial-gradient(circle at 20% 30%, rgba(69, 243, 167, 0.2), transparent 55%),
    radial-gradient(circle at 80% 70%, rgba(122, 162, 255, 0.18), transparent 60%);
  filter: blur(10px);
  opacity: 0.7;
  pointer-events: none;
}

.chapter-inner > * {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.chapter-inner > *.in {
  opacity: 1;
  transform: translateY(0);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.3em;
  font-size: 0.75rem;
  color: var(--muted);
}

h1,
h2,
h3 {
  font-family: "Space Grotesk", "IBM Plex Sans", system-ui, sans-serif;
  font-weight: 600;
  line-height: 1.1;
}

h1 {
  font-size: clamp(2.9rem, 6vw, 5.6rem);
}

h2 {
  font-size: clamp(2rem, 4.5vw, 3.8rem);
}

h3 {
  font-size: clamp(1.35rem, 2.6vw, 2.1rem);
}

.lead {
  font-size: clamp(1.2rem, 2.2vw, 1.6rem);
  color: var(--ink);
}

.support {
  color: var(--muted);
  max-width: 46ch;
}

.cta-row {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.button {
  padding: 0.9rem 1.6rem;
  border-radius: 999px;
  background: var(--accent);
  color: #061109;
  font-weight: 600;
  box-shadow: 0 20px 45px var(--glow);
}

.button-strong {
  font-size: 1rem;
  padding: 1.1rem 2rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
}

.ghost {
  padding: 0.9rem 1.6rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.02);
}

.chapter-hero {
  min-height: 90vh;
}

.hero-visual {
  position: absolute;
  inset: 12vh 8vw auto auto;
  width: min(45vw, 360px);
  height: min(45vw, 360px);
  display: grid;
  place-items: center;
  z-index: 1;
}

.device-shell {
  width: 80%;
  height: 60%;
  border-radius: 22px;
  background: linear-gradient(135deg, #10151b 0%, #1b232c 55%, #0c1116 100%);
  box-shadow: 0 30px 60px var(--shadow), inset 0 0 25px rgba(69, 243, 167, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.device-glow {
  position: absolute;
  width: 90%;
  height: 70%;
  border-radius: 28px;
  background: radial-gradient(circle at 70% 30%, rgba(69, 243, 167, 0.35), transparent 55%);
  filter: blur(10px);
  z-index: -1;
}

.device-stand {
  position: absolute;
  bottom: 8%;
  width: 65%;
  height: 10%;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  filter: blur(1px);
}

.chapter-problem {
  align-items: flex-start;
  padding-top: 14vh;
}

.problem-field {
  position: relative;
  padding: 3.5rem 3.2rem;
  border-radius: 34px;
  background: radial-gradient(circle at 20% 20%, rgba(69, 243, 167, 0.08), transparent 45%),
    linear-gradient(180deg, rgba(8, 11, 14, 0.65), rgba(8, 10, 13, 0.3));
  box-shadow: 0 40px 90px rgba(0, 0, 0, 0.45);
  overflow: hidden;
}

.problem-field::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(140deg, rgba(122, 162, 255, 0.35), rgba(69, 243, 167, 0.35), transparent);
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask-composite: exclude;
  pointer-events: none;
}

.problem-orbit {
  position: absolute;
  inset: -20% -10%;
  pointer-events: none;
  z-index: 0;
}

.problem-orbit span {
  position: absolute;
  width: 46%;
  height: 46%;
  border-radius: 999px;
  border: 1px solid rgba(122, 162, 255, 0.2);
  box-shadow: 0 0 40px rgba(69, 243, 167, 0.12);
  animation: drift 16s ease-in-out infinite;
}

.problem-orbit span:nth-child(1) {
  top: 10%;
  left: 4%;
}

.problem-orbit span:nth-child(2) {
  top: 30%;
  right: 8%;
  width: 55%;
  height: 55%;
  animation-delay: -4s;
}

.problem-orbit span:nth-child(3) {
  bottom: 8%;
  left: 18%;
  width: 38%;
  height: 38%;
  animation-delay: -8s;
}

.problem-field .split,
.problem-field .whisper,
.problem-field .problem-cta {
  position: relative;
  z-index: 1;
}

.quote-stack {
  position: relative;
  min-height: 11rem;
  display: block;
  padding-right: min(18vw, 180px);
  margin-bottom: 1.5rem;
}

.quote-line {
  position: absolute;
  inset: 0 auto auto 0;
  font-family: "Bebas Neue", "Space Grotesk", sans-serif;
  font-size: clamp(2rem, 4.1vw, 3.3rem);
  letter-spacing: 0.03em;
  color: rgba(242, 243, 244, 0.85);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  max-width: 32ch;
}

.quote-line.active {
  opacity: 1;
  transform: translateY(0);
}

.quote-line:nth-child(even) {
  color: rgba(122, 162, 255, 0.8);
}

.problem-cta {
  margin-top: 2.6rem;
  display: flex;
  justify-content: flex-start;
}

.split {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
}

.shard {
  font-size: clamp(1.6rem, 3.2vw, 2.6rem);
  max-width: 18ch;
}

.shard-major {
  font-family: "Bebas Neue", "Space Grotesk", sans-serif;
  font-size: clamp(2.2rem, 4.6vw, 3.6rem);
  letter-spacing: 0.04em;
}

.shard-minor {
  font-size: clamp(1.3rem, 2.4vw, 2rem);
}

.muted {
  color: var(--muted);
}

.whisper {
  color: var(--muted);
  max-width: 36ch;
  margin-top: 2rem;
}

.chapter-shift {
  background: radial-gradient(circle at top right, rgba(69, 243, 167, 0.18), transparent 50%);
}

.chapter-hardware {
  align-items: stretch;
}

.hardware-grid {
  display: grid;
  gap: 5vh;
  max-width: 70ch;
}

.hardware-visual {
  position: absolute;
  right: 8vw;
  top: 10vh;
  width: min(38vw, 320px);
  height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.6;
}

.rail {
  width: 4px;
  height: 60%;
  background: linear-gradient(180deg, transparent, rgba(122, 162, 255, 0.6), transparent);
  border-radius: 999px;
}

.capsule {
  position: absolute;
  width: 70%;
  height: 40%;
  border-radius: 120px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.03);
}

.chapter-software {
  background: radial-gradient(circle at left, rgba(122, 162, 255, 0.18), transparent 50%);
}

.software-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.8fr);
  gap: 4vw;
  align-items: center;
}

.software-rail {
  display: grid;
  gap: 1.4rem;
  padding-left: 2rem;
  border-left: 2px solid rgba(122, 162, 255, 0.25);
}

.rail-line {
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  color: rgba(242, 243, 244, 0.8);
}

.chapter-custom {
  background: radial-gradient(circle at 80% 10%, rgba(122, 162, 255, 0.12), transparent 55%);
}

.custom-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 4vw;
  align-items: center;
}

.custom-copy h2 {
  max-width: 22ch;
}

.custom-panel {
  position: relative;
  padding: 2.4rem 2.2rem;
  border-radius: 26px;
  background: linear-gradient(180deg, rgba(10, 14, 18, 0.75), rgba(8, 10, 13, 0.35));
  box-shadow: 0 26px 60px rgba(0, 0, 0, 0.4);
  display: grid;
  gap: 1.4rem;
}

.custom-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(120deg, rgba(69, 243, 167, 0.35), rgba(122, 162, 255, 0.2), transparent);
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask-composite: exclude;
  pointer-events: none;
}

.custom-item {
  display: grid;
  gap: 0.5rem;
  padding: 0.9rem 1rem;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.02);
}

.custom-tag {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.72rem;
  color: rgba(242, 243, 244, 0.65);
}

.custom-text {
  font-size: 1.1rem;
  color: var(--ink);
}

.chapter-compare {
  align-items: flex-start;
}

.compare-hub {
  display: grid;
  gap: 2.5rem;
}

.compare-controls {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.compare-tab {
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(10, 14, 18, 0.7);
  color: var(--muted);
  padding: 0.65rem 1.3rem;
  border-radius: 999px;
  font-size: 0.9rem;
}

.compare-tab.active {
  color: #061109;
  background: var(--accent);
  box-shadow: 0 14px 35px rgba(69, 243, 167, 0.25);
}

.compare-stage {
  position: relative;
  padding: 2.4rem 2.8rem;
  border-radius: 28px;
  background: linear-gradient(180deg, rgba(10, 14, 18, 0.75), rgba(8, 10, 13, 0.35));
  box-shadow: 0 28px 70px rgba(0, 0, 0, 0.4);
}

.compare-stage::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(69, 243, 167, 0.4), rgba(122, 162, 255, 0.2), transparent);
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask-composite: exclude;
  pointer-events: none;
}

.compare-heads {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2rem;
  align-items: end;
  margin-bottom: 2rem;
}

.compare-table {
  display: grid;
  gap: 1rem;
}

.compare-row {
  display: grid;
  grid-template-columns: minmax(140px, 0.8fr) repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
  padding: 0.9rem 1rem;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.02);
  transition: background 0.3s ease, transform 0.3s ease;
}

.compare-row span:first-child {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.7rem;
}

.compare-row .yes {
  color: var(--ink);
}

.compare-row .no {
  color: rgba(242, 243, 244, 0.6);
}

.compare-row .mute {
  color: rgba(154, 164, 173, 0.8);
}

.compare-row:hover,
.compare-row:focus-within {
  background: rgba(69, 243, 167, 0.08);
  transform: translateX(6px);
}

.compare-detail {
  margin-top: 1.8rem;
  color: var(--muted);
  font-size: 1rem;
  max-width: 50ch;
}

.trust-ribbon {
  display: grid;
  gap: 2.5rem;
}

.trust-title h2 {
  font-size: clamp(2rem, 5vw, 4.4rem);
}

.trust-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.6rem;
  padding: 1.6rem 1.8rem;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.trust-strip p {
  font-size: 1.05rem;
  color: var(--ink);
}

.chapter-sustain {
  background: radial-gradient(circle at 80% 20%, rgba(69, 243, 167, 0.16), transparent 60%);
}

.chapter-final {
  min-height: 80vh;
  text-align: center;
}

.final-cta {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 4vw;
  align-items: center;
}

.final-copy h2 {
  max-width: 22ch;
}

.final-proof {
  display: flex;
  gap: 1.2rem;
  flex-wrap: wrap;
  margin-top: 1.6rem;
  color: rgba(154, 164, 173, 0.9);
  font-size: 0.95rem;
}

.final-proof span {
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.final-action {
  display: flex;
  justify-content: center;
}

.final-panel {
  width: min(100%, 420px);
  padding: 2.4rem 2.2rem;
  border-radius: 28px;
  background: linear-gradient(180deg, rgba(10, 14, 18, 0.8), rgba(8, 10, 13, 0.35));
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.panel-title {
  font-family: "Space Grotesk", "IBM Plex Sans", system-ui, sans-serif;
  font-size: 1.4rem;
  font-weight: 600;
}

.panel-sub {
  color: var(--muted);
  margin-top: 0.6rem;
  margin-bottom: 1.6rem;
}

.panel-note {
  margin-top: 1.4rem;
  color: rgba(154, 164, 173, 0.8);
  font-size: 0.9rem;
}

.chapter-community {
  background: radial-gradient(circle at 10% 30%, rgba(69, 243, 167, 0.12), transparent 55%);
}

.community-slice {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 4vw;
  align-items: start;
}

.community-left h2 {
  max-width: 20ch;
}

.community-right {
  padding: 1.6rem 1.8rem;
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(10, 14, 18, 0.7), rgba(8, 10, 13, 0.3));
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}

.community-links {
  margin-top: 1.5rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.glow-frame .eyebrow {
  color: rgba(242, 243, 244, 0.7);
}

.glow-frame .support {
  color: rgba(154, 164, 173, 0.85);
}

@media (max-width: 900px) {
  .site-nav {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-header {
    padding: 1rem 6vw 0;
  }

  .hero-visual {
    position: relative;
    inset: auto;
    width: min(70vw, 320px);
    height: min(70vw, 320px);
    margin-top: 4vh;
  }

  .chapter-hero {
    align-items: flex-start;
  }

  .split {
    flex-direction: column;
  }

  .hardware-visual {
    display: none;
  }

  .custom-layout {
    grid-template-columns: 1fr;
  }

  .custom-panel {
    order: 2;
  }

  .software-wrap {
    grid-template-columns: 1fr;
  }

  .software-rail {
    padding-left: 0;
    border-left: none;
  }

  .community-slice {
    grid-template-columns: 1fr;
  }

  .final-cta {
    grid-template-columns: 1fr;
    text-align: left;
  }

  .final-action {
    justify-content: flex-start;
  }

  .compare-heads {
    grid-template-columns: 1fr;
  }

  .compare-row {
    grid-template-columns: 1fr;
    gap: 0.6rem;
  }
}

@media (max-width: 640px) {
  .chapter {
    padding: 9vh 7vw;
  }

  .nav-shell {
    padding: 0.7rem 1.2rem;
  }

  .nav-panel {
    padding: 1rem 1.2rem;
  }

  .cta-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .chapter-final {
    text-align: left;
  }

  .glow-frame {
    padding: 2rem 2rem;
  }

  .problem-field {
    padding: 2.6rem 2rem;
  }

  .quote-stack {
    padding-right: 0;
    min-height: 12rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .chapter-inner > * {
    transition: none;
    opacity: 1;
    transform: none;
  }

  .chapter {
    transition: none;
    opacity: 1;
    transform: none;
  }

  .nav-panel {
    transition: none;
  }

  .problem-orbit span,
  .problem-cta {
    animation: none;
  }

  .quote-line {
    transition: none;
    opacity: 1;
    position: static;
    transform: none;
  }
}

@keyframes drift {
  0% {
    transform: translate3d(0, 0, 0) scale(1);
    opacity: 0.35;
  }
  50% {
    transform: translate3d(10px, -12px, 0) scale(1.05);
    opacity: 0.6;
  }
  100% {
    transform: translate3d(0, 0, 0) scale(1);
    opacity: 0.35;
  }
}