:root {
  --bg-0: #0a0d12;
  --bg-1: #0f141c;
  --bg-2: #141d2a;
  --ink-strong: #f3f8ff;
  --ink: #d6e4f9;
  --ink-muted: #95a8c4;
  --line-soft: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(124, 174, 255, 0.48);
  --surface-main: rgba(13, 18, 26, 0.8);
  --surface-alt: rgba(17, 24, 35, 0.82);
  --accent-cyan: #5fd6ff;
  --accent-blue: #6ea0ff;
  --accent-gold: #f2bf67;
  --shadow-main: 0 30px 90px rgba(0, 0, 0, 0.5);
  --radius-xl: 34px;
  --radius-lg: 22px;
  --radius-md: 14px;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Plus Jakarta Sans", "Segoe UI", sans-serif;
  background: linear-gradient(130deg, var(--bg-0), var(--bg-1) 52%, var(--bg-2));
  overflow-x: hidden;
}

.intro-screen {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: grid;
  place-items: center;
  background:
    radial-gradient(1100px 740px at 12% 6%, rgba(95, 214, 255, 0.2), transparent 62%),
    radial-gradient(920px 720px at 88% 0%, rgba(110, 160, 255, 0.16), transparent 64%),
    linear-gradient(148deg, #06090f, #0f141c 54%, #121c29);
  cursor: pointer;
  transition: opacity 620ms ease, visibility 620ms ease;
}

.intro-screen.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.intro-core {
  text-align: center;
  padding: 20px;
  animation: introPulse 2.7s cubic-bezier(0.22, 0.82, 0.2, 1) forwards;
}

.intro-kicker {
  margin: 0;
  color: #9fb3d6;
  letter-spacing: 0.22em;
  font-size: clamp(11px, 1vw, 14px);
  text-transform: uppercase;
}

.intro-title {
  margin: 12px 0 0;
  color: #f6f9ff;
  font-family: "Space Grotesk", "Plus Jakarta Sans", sans-serif;
  font-size: clamp(2.2rem, 8.5vw, 7.6rem);
  letter-spacing: 0.04em;
  line-height: 0.95;
  text-transform: uppercase;
  text-shadow: 0 16px 50px rgba(0, 0, 0, 0.58);
}

.intro-sub {
  margin: 12px 0 0;
  color: #b8cae8;
  letter-spacing: 0.16em;
  font-size: clamp(11px, 1.2vw, 17px);
  text-transform: uppercase;
}

.bg-layer {
  position: fixed;
  pointer-events: none;
  filter: blur(68px);
  opacity: 0.66;
  z-index: -3;
}

.bg-layer-a {
  width: min(62vw, 920px);
  aspect-ratio: 1 / 1;
  top: -32%;
  left: -14%;
  background: radial-gradient(circle at 36% 44%, rgba(95, 214, 255, 0.38), rgba(95, 214, 255, 0));
  animation: driftA 16s ease-in-out infinite alternate;
}

.bg-layer-b {
  width: min(58vw, 860px);
  aspect-ratio: 1 / 1;
  right: -10%;
  bottom: -36%;
  background: radial-gradient(circle at 48% 45%, rgba(110, 160, 255, 0.33), rgba(110, 160, 255, 0));
  animation: driftB 20s ease-in-out infinite alternate;
}

.grid-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -2;
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(circle at 50% 44%, rgba(0, 0, 0, 0.85), transparent 78%);
}

.site-shell {
  width: min(1280px, 100%);
  margin: 0 auto;
  padding: clamp(20px, 4vw, 52px);
  display: grid;
  gap: clamp(18px, 2.5vw, 28px);
  position: relative;
  z-index: 1;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.wordmark {
  color: var(--ink-strong);
  text-decoration: none;
  font-family: "Space Grotesk", "Plus Jakarta Sans", sans-serif;
  letter-spacing: 0.14em;
  font-weight: 700;
  font-size: 14px;
}

.topbar-side {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.topbar-meta {
  margin: 0;
  color: var(--ink-muted);
  font-size: 13px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.lang-switch {
  display: inline-flex;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.04);
  padding: 3px;
}

.lang-btn {
  appearance: none;
  border: 0;
  border-radius: 999px;
  min-width: 42px;
  min-height: 30px;
  padding: 0 10px;
  font-family: "Plus Jakarta Sans", "Segoe UI", sans-serif;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #a8bbd9;
  background: transparent;
  cursor: pointer;
  transition: background 160ms ease, color 160ms ease;
}

.lang-btn.is-active {
  color: #f4f8ff;
  background: rgba(110, 160, 255, 0.3);
}

.hero {
  background:
    linear-gradient(118deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.01) 48%),
    var(--surface-main);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-xl);
  padding: clamp(24px, 5vw, 54px);
  box-shadow: var(--shadow-main);
  backdrop-filter: blur(24px) saturate(165%);
  -webkit-backdrop-filter: blur(24px) saturate(165%);
}

.eyebrow {
  margin: 0;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 12px;
  font-weight: 700;
}

.hero h1 {
  margin: 12px 0 0;
  color: var(--ink-strong);
  font-family: "Space Grotesk", "Plus Jakarta Sans", sans-serif;
  letter-spacing: -0.03em;
  line-height: 0.96;
  font-size: clamp(2.25rem, 6vw, 5.25rem);
  max-width: 12.6ch;
}

.hero-copy {
  margin: 16px 0 0;
  color: var(--ink-muted);
  max-width: 58ch;
  font-size: clamp(15px, 1.55vw, 18px);
  line-height: 1.55;
}

.platform-selector {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(10px, 1.4vw, 14px);
}

.platform-card {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(170deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.012)),
    var(--surface-alt);
  color: var(--ink-strong);
  padding: clamp(18px, 2.4vw, 24px);
  text-align: left;
  display: grid;
  gap: 10px;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
  transition:
    transform 220ms cubic-bezier(0.2, 0.9, 0.18, 1),
    border-color 220ms ease,
    background 220ms ease,
    box-shadow 220ms ease;
}

.platform-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 255, 255, 0.24);
}

.platform-card.is-active {
  border-color: var(--line-strong);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.15),
    0 14px 36px rgba(43, 110, 214, 0.28);
  background:
    linear-gradient(160deg, rgba(110, 160, 255, 0.17), rgba(95, 214, 255, 0.04) 62%),
    var(--surface-alt);
}

.platform-icon {
  width: 42px;
  height: 42px;
  border-radius: 13px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  display: inline-grid;
  place-items: center;
  background: rgba(255, 255, 255, 0.045);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.brand-logo {
  width: 22px;
  height: 22px;
  display: block;
  fill: currentColor;
}

.icon-ios {
  color: #f5f9ff;
}

.icon-android {
  color: #8be48f;
}

.icon-desktop {
  color: #f7c874;
}

.desktop-mark {
  font-family: "Space Grotesk", "Plus Jakarta Sans", sans-serif;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.platform-label {
  font-family: "Space Grotesk", "Plus Jakarta Sans", sans-serif;
  letter-spacing: -0.01em;
  font-size: clamp(1.1rem, 2vw, 1.45rem);
  font-weight: 600;
}

.platform-caption {
  font-size: 14px;
  color: var(--ink-muted);
}

.platform-panel {
  border-radius: var(--radius-xl);
  border: 1px solid var(--line-soft);
  background:
    linear-gradient(120deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.012) 44%),
    rgba(12, 18, 28, 0.88);
  box-shadow: var(--shadow-main);
  padding: clamp(22px, 4vw, 44px);
  backdrop-filter: blur(24px) saturate(160%);
  -webkit-backdrop-filter: blur(24px) saturate(160%);
}

.platform-panel.panel-refresh {
  animation: panelSwap 320ms cubic-bezier(0.22, 0.82, 0.2, 1);
}

.panel-head {
  display: grid;
  gap: 10px;
}

.panel-eyebrow {
  margin: 0;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.13em;
  font-size: 11px;
  font-weight: 700;
}

.panel-head h2 {
  margin: 0;
  color: var(--ink-strong);
  font-family: "Space Grotesk", "Plus Jakarta Sans", sans-serif;
  letter-spacing: -0.03em;
  font-size: clamp(1.8rem, 4vw, 3.2rem);
  line-height: 1;
}

.panel-description {
  margin: 0;
  color: var(--ink-muted);
  max-width: 62ch;
  line-height: 1.55;
  font-size: clamp(14px, 1.4vw, 17px);
}

.panel-grid {
  margin-top: clamp(20px, 2.7vw, 28px);
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  gap: clamp(16px, 2vw, 22px);
  align-items: start;
}

.panel-grid.no-qr {
  grid-template-columns: 1fr;
}

.panel-main {
  display: grid;
  gap: 16px;
}

.feature-list {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 8px;
}

.feature-list li {
  color: #d9e7fd;
  line-height: 1.5;
}

.notice {
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 214, 156, 0.35);
  background: rgba(242, 191, 103, 0.08);
  color: #ffe8bf;
  font-size: 14px;
  line-height: 1.45;
  padding: 11px 13px;
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.cta {
  appearance: none;
  border: 0;
  border-radius: var(--radius-md);
  min-height: 48px;
  padding: 0 18px;
  font-family: "Plus Jakarta Sans", "Segoe UI", sans-serif;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  color: var(--ink-strong);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 160ms ease, filter 160ms ease;
}

.cta:hover {
  transform: translateY(-2px);
  filter: brightness(1.04);
}

.cta-primary {
  background: linear-gradient(132deg, var(--accent-blue), #4992ff 52%, var(--accent-cyan));
  box-shadow: 0 8px 26px rgba(60, 129, 238, 0.38);
}

.cta-secondary {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
}

.panel-link {
  margin: 0;
  color: #b9cff0;
  font-size: 13px;
  overflow-wrap: anywhere;
}

.qr-block {
  border-radius: 24px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(10, 15, 24, 0.88);
  padding: clamp(14px, 2vw, 18px);
}

.qr-title {
  margin: 0 0 12px;
  color: var(--ink-strong);
  letter-spacing: 0.02em;
  font-size: 14px;
}

.qr-frame {
  border-radius: 16px;
  background: #05080d;
  border: 1px solid rgba(255, 255, 255, 0.1);
  min-height: 280px;
  display: grid;
  place-items: center;
  padding: 12px;
}

.qr-frame img {
  width: min(250px, 100%);
  aspect-ratio: 1 / 1;
  border-radius: 12px;
  padding: 8px;
  background: #ffffff;
}

.qr-frame.qr-failed img {
  display: none;
}

.qr-fallback {
  margin: 0;
  display: none;
  text-align: center;
  color: var(--ink-muted);
  max-width: 30ch;
  line-height: 1.5;
  font-size: 13px;
}

.qr-frame.qr-failed .qr-fallback {
  display: block;
}

.footnote {
  text-align: center;
  color: #9cb0cf;
  font-size: 13px;
  line-height: 1.5;
  padding-bottom: 10px;
}

.footnote p {
  margin: 0;
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 620ms cubic-bezier(0.2, 0.8, 0.2, 1), transform 620ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes introPulse {
  0% {
    opacity: 0;
    transform: scale(0.93) translateY(18px);
    filter: blur(7px);
  }
  18% {
    opacity: 1;
    transform: scale(1) translateY(0);
    filter: blur(0);
  }
  75% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: scale(1.02) translateY(-5px);
    filter: blur(3px);
  }
}

@keyframes driftA {
  from {
    transform: translate3d(0, 0, 0) scale(1);
  }
  to {
    transform: translate3d(6%, 9%, 0) scale(1.08);
  }
}

@keyframes driftB {
  from {
    transform: translate3d(0, 0, 0) scale(1);
  }
  to {
    transform: translate3d(-8%, -6%, 0) scale(1.1);
  }
}

@keyframes panelSwap {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.99);
    filter: blur(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
    filter: blur(0);
  }
}

@media (max-width: 1080px) {
  .platform-selector {
    grid-template-columns: 1fr;
  }

  .panel-grid {
    grid-template-columns: 1fr;
  }

  .qr-frame {
    min-height: 250px;
  }
}

@media (max-width: 680px) {
  .site-shell {
    padding: 16px;
    gap: 14px;
  }

  .hero,
  .platform-panel {
    border-radius: 26px;
  }

  .cta {
    width: 100%;
  }

  .panel-link {
    font-size: 12px;
  }

  .topbar-side {
    gap: 8px;
  }

  .topbar-meta {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .intro-core,
  .intro-screen,
  .reveal,
  .platform-card,
  .cta,
  .bg-layer-a,
  .bg-layer-b {
    transition: none;
    animation: none;
  }
}