:root {
  color-scheme: dark;
  --bg: #030613;
  --bg-2: #070b22;
  --ink: #f7f3ff;
  --muted: #c9c4ef;
  --soft: rgba(219, 232, 255, 0.72);
  --line: rgba(172, 190, 255, 0.28);
  --line-strong: rgba(197, 211, 255, 0.62);
  --panel: rgba(13, 18, 44, 0.72);
  --panel-2: rgba(26, 29, 72, 0.58);
  --cyan: #59e4ff;
  --blue: #4f8dff;
  --violet: #9b65ff;
  --pink: #e2a5ff;
  --gold: #f4d99a;
  --shadow: 0 28px 90px rgba(0, 0, 0, 0.45);
  --radius: 24px;
  --radius-sm: 16px;
  --max: 1500px;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background:
    radial-gradient(circle at 80% 8%, rgba(113, 95, 255, 0.24), transparent 30vw),
    radial-gradient(circle at 20% 70%, rgba(40, 198, 255, 0.17), transparent 34vw),
    linear-gradient(180deg, #020512 0%, #070923 48%, #02040e 100%);
  font-family:
    "Noto Serif SC", "Microsoft YaHei UI", "Microsoft YaHei", "PingFang SC",
    "Hiragino Sans GB", sans-serif;
}

body::before,
body::after {
  position: fixed;
  inset: 0;
  z-index: -4;
  pointer-events: none;
  content: "";
}

body::before {
  opacity: 0.46;
  background-image:
    linear-gradient(rgba(113, 145, 255, 0.11) 1px, transparent 1px),
    linear-gradient(90deg, rgba(113, 145, 255, 0.11) 1px, transparent 1px);
  background-size: 96px 96px;
  mask-image: linear-gradient(to bottom, transparent 0%, #000 16%, #000 76%, transparent 100%);
  animation: gridFlow 18s linear infinite;
}

body::after {
  background:
    radial-gradient(circle, rgba(255, 255, 255, 0.95) 0 1px, transparent 2px) 2% 12% / 160px 160px,
    radial-gradient(circle, rgba(118, 231, 255, 0.85) 0 1px, transparent 2px) 35% 8% / 220px 220px,
    radial-gradient(circle, rgba(182, 137, 255, 0.85) 0 1px, transparent 2px) 75% 30% / 180px 180px;
  opacity: 0.54;
  animation: starDrift 28s linear infinite;
}

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

button {
  font: inherit;
}

.star-canvas {
  position: fixed;
  inset: 0;
  z-index: -3;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.site-orbit {
  position: fixed;
  right: -26vw;
  bottom: -44vw;
  z-index: -2;
  width: 82vw;
  aspect-ratio: 1;
  border: 1px solid rgba(129, 166, 255, 0.16);
  border-radius: 50%;
  box-shadow:
    inset 0 0 90px rgba(106, 91, 255, 0.22),
    0 0 80px rgba(75, 216, 255, 0.14);
  animation: orbitGlow 22s linear infinite;
}

.site-orbit::before,
.site-orbit::after {
  position: absolute;
  inset: 13%;
  border: 1px solid rgba(190, 144, 255, 0.15);
  border-radius: inherit;
  content: "";
}

.site-orbit::after {
  inset: 28%;
  border-color: rgba(86, 225, 255, 0.17);
}

.site-header {
  position: fixed;
  top: 16px;
  left: 50%;
  z-index: 40;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  width: min(calc(100% - 32px), 1580px);
  min-height: 72px;
  padding: 0 22px;
  border: 1px solid rgba(211, 222, 255, 0.18);
  border-radius: 999px;
  background: rgba(4, 8, 25, 0.58);
  box-shadow:
    0 24px 70px rgba(0, 0, 0, 0.34),
    inset 0 0 40px rgba(120, 117, 255, 0.08);
  backdrop-filter: blur(22px);
  transform: translateX(-50%);
  transition: background 0.35s var(--ease), border-color 0.35s var(--ease), transform 0.35s var(--ease);
}

.site-header.scrolled {
  border-color: rgba(119, 232, 255, 0.34);
  background: rgba(5, 8, 24, 0.8);
  transform: translateX(-50%) translateY(-4px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  font-size: clamp(21px, 2vw, 30px);
  font-weight: 800;
  letter-spacing: 0;
  text-shadow: 0 0 22px rgba(190, 178, 255, 0.44);
}

.brand-mark {
  position: relative;
  display: inline-grid;
  flex: 0 0 auto;
  width: 42px;
  aspect-ratio: 1;
  place-items: center;
  filter: drop-shadow(0 0 18px rgba(111, 232, 255, 0.55));
}

.brand-mark::before,
.brand-mark::after {
  position: absolute;
  inset: 9px;
  content: "";
  background: linear-gradient(135deg, #fff, #7eeaff 35%, #9a6cff 70%, #fff);
  clip-path: polygon(50% 0, 63% 37%, 100% 50%, 63% 63%, 50% 100%, 37% 63%, 0 50%, 37% 37%);
}

.brand-mark::after {
  inset: 2px;
  z-index: -1;
  opacity: 0.46;
  background: #8f6dff;
  animation: pulseStar 2.8s ease-in-out infinite;
}

.brand-mark.large {
  width: 106px;
  margin-bottom: 8px;
}

.site-nav {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: clamp(30px, 6vw, 96px);
}

.site-nav a {
  position: relative;
  padding: 22px 4px;
  color: rgba(247, 243, 255, 0.82);
  font-size: 18px;
  font-weight: 700;
  transition: color 0.25s var(--ease), text-shadow 0.25s var(--ease), transform 0.25s var(--ease);
}

.site-nav a::after {
  position: absolute;
  right: 50%;
  bottom: 12px;
  left: 50%;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, transparent, #fff, var(--violet), transparent);
  box-shadow: 0 0 18px rgba(164, 111, 255, 0.95);
  content: "";
  transition: left 0.28s var(--ease), right 0.28s var(--ease);
}

.site-nav a:hover,
.site-nav a.active {
  color: #fff;
  text-shadow: 0 0 18px rgba(180, 157, 255, 0.85);
  transform: translateY(-1px);
}

.site-nav a:hover::after,
.site-nav a.active::after {
  right: -10px;
  left: -10px;
}

.header-cta,
.btn {
  position: relative;
  isolation: isolate;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 11px;
  min-height: 48px;
  border: 1px solid rgba(214, 223, 255, 0.56);
  border-radius: 999px;
  overflow: hidden;
  color: #fff;
  font-weight: 800;
  letter-spacing: 0;
  box-shadow:
    0 0 0 1px rgba(120, 232, 255, 0.08),
    0 14px 34px rgba(55, 78, 255, 0.28),
    inset 0 0 24px rgba(255, 255, 255, 0.12);
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), border-color 0.25s var(--ease);
}

.header-cta {
  justify-self: end;
  padding: 0 23px;
  background: linear-gradient(135deg, rgba(153, 93, 255, 0.9), rgba(61, 154, 255, 0.92));
  white-space: nowrap;
}

.header-cta::before,
.btn::before {
  position: absolute;
  inset: 0;
  z-index: -1;
  content: "";
  background: linear-gradient(110deg, transparent 0%, rgba(255, 255, 255, 0.0) 30%, rgba(255, 255, 255, 0.72) 48%, rgba(126, 238, 255, 0.3) 55%, transparent 72%);
  transform: translateX(-110%);
  animation: buttonSweep 3.2s ease-in-out infinite;
}

.header-cta:hover,
.btn:hover {
  border-color: rgba(127, 239, 255, 0.9);
  box-shadow:
    0 0 0 1px rgba(121, 233, 255, 0.3),
    0 20px 48px rgba(72, 111, 255, 0.44),
    0 0 42px rgba(164, 94, 255, 0.33),
    inset 0 0 28px rgba(255, 255, 255, 0.16);
  transform: translateY(-3px);
}

.nav-toggle {
  display: none;
  width: 46px;
  height: 46px;
  border: 1px solid rgba(199, 214, 255, 0.28);
  border-radius: 50%;
  background: rgba(13, 18, 44, 0.78);
  color: #fff;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 5px auto;
  border-radius: 99px;
  background: #fff;
}

.section-shell {
  position: relative;
  width: min(calc(100% - 44px), var(--max));
  margin: 0 auto;
}

.hero,
.download-hero,
.tutorial-hero {
  min-height: 100vh;
  padding-top: 130px;
  padding-bottom: 64px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(320px, 0.76fr) minmax(560px, 1.18fr);
  gap: 36px;
  align-items: center;
}

.hero-copy {
  position: relative;
  z-index: 3;
  max-width: 650px;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 18px;
  font-size: clamp(62px, 8.6vw, 142px);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: 0;
  text-shadow:
    0 0 20px rgba(255, 255, 255, 0.6),
    0 0 54px rgba(146, 96, 255, 0.72),
    0 0 120px rgba(52, 220, 255, 0.3);
}

.hero-subtitle {
  margin-bottom: 18px;
  color: #fff;
  font-size: clamp(24px, 2.2vw, 38px);
  font-weight: 800;
  letter-spacing: 0.12em;
}

.hero-text {
  max-width: 580px;
  margin-bottom: 32px;
  color: var(--muted);
  font-size: clamp(17px, 1.3vw, 22px);
  line-height: 1.9;
}

.hero-actions,
.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.btn {
  min-width: 188px;
  min-height: 64px;
  padding: 0 28px;
  font-size: 18px;
}

.btn-primary {
  background:
    radial-gradient(circle at 18% 0%, rgba(255, 255, 255, 0.35), transparent 36%),
    linear-gradient(135deg, #a760ff, #4988ff 58%, #54dfff);
}

.btn-ghost {
  background: rgba(8, 12, 30, 0.55);
}

.btn-wide {
  width: min(100%, 470px);
  min-height: 76px;
  border-radius: 14px;
  font-size: clamp(18px, 1.6vw, 24px);
}

.hero-stage {
  position: relative;
  min-height: 700px;
  perspective: 1200px;
}

.concept-img {
  position: absolute;
  top: -2%;
  right: -15%;
  width: min(1100px, 78vw);
  max-width: none;
  border-radius: 26px;
  opacity: 0.72;
  filter: saturate(1.18) contrast(1.06) drop-shadow(0 35px 90px rgba(0, 0, 0, 0.5));
  mask-image: radial-gradient(circle at 72% 48%, #000 0%, #000 44%, rgba(0, 0, 0, 0.72) 60%, transparent 82%);
  transform: rotateY(-8deg) rotateX(3deg);
  animation: floatPanel 8s ease-in-out infinite;
}

.glass-preview {
  position: absolute;
  top: 24%;
  right: 18%;
  width: min(660px, 55vw);
  aspect-ratio: 1.36;
  border: 1px solid rgba(207, 218, 255, 0.42);
  border-radius: 22px;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.07), rgba(90, 99, 255, 0.06)),
    rgba(10, 14, 36, 0.54);
  box-shadow:
    var(--shadow),
    inset 0 0 45px rgba(124, 109, 255, 0.16),
    0 0 80px rgba(67, 206, 255, 0.16);
  backdrop-filter: blur(20px);
  transform: rotateY(-10deg) rotateX(4deg);
  animation: floatPanel 7.5s ease-in-out infinite reverse;
}

.preview-top {
  display: flex;
  gap: 8px;
  height: 46px;
  align-items: center;
  padding: 0 20px;
  border-bottom: 1px solid rgba(197, 212, 255, 0.2);
  background: rgba(255, 255, 255, 0.05);
}

.preview-top span {
  width: 10px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.6);
  box-shadow: 0 0 14px rgba(111, 231, 255, 0.45);
}

.canvas-lines {
  position: absolute;
  inset: 46px 0 0;
  background-image:
    linear-gradient(rgba(152, 184, 255, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(152, 184, 255, 0.12) 1px, transparent 1px);
  background-size: 58px 58px;
  animation: gridFlow 11s linear infinite;
}

.canvas-lines i {
  position: absolute;
  display: block;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, transparent, var(--violet), var(--cyan), transparent);
  box-shadow: 0 0 18px rgba(105, 224, 255, 0.65);
  transform-origin: left;
}

.canvas-lines i:nth-child(1) {
  top: 28%;
  left: 14%;
  width: 54%;
  transform: rotate(8deg);
}

.canvas-lines i:nth-child(2) {
  top: 52%;
  left: 22%;
  width: 46%;
  transform: rotate(-12deg);
}

.canvas-lines i:nth-child(3) {
  top: 68%;
  left: 35%;
  width: 36%;
  transform: rotate(6deg);
}

.canvas-lines i:nth-child(4) {
  top: 40%;
  left: 52%;
  width: 28%;
  transform: rotate(58deg);
}

.story-card {
  position: absolute;
  min-width: 150px;
  padding: 16px 18px;
  border: 1px solid rgba(204, 214, 255, 0.42);
  border-radius: 15px;
  background: rgba(16, 20, 52, 0.78);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.34), inset 0 0 24px rgba(138, 107, 255, 0.16);
  color: #fff;
  font-weight: 800;
  animation: cardReveal 6s ease-in-out infinite;
}

.card-a {
  top: 23%;
  left: 17%;
}

.card-b {
  top: 42%;
  right: 15%;
  animation-delay: -1.4s;
}

.card-c {
  bottom: 15%;
  left: 37%;
  animation-delay: -2.7s;
}

.feature-strip {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
  margin-top: -36px;
}

.feature-card,
.info-card,
.workflow-panel,
.step-card,
.video-panel,
.faq-panel {
  position: relative;
  border: 1px solid rgba(196, 212, 255, 0.32);
  border-radius: var(--radius);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.1), rgba(116, 101, 255, 0.06)),
    rgba(9, 13, 34, 0.68);
  box-shadow:
    0 24px 70px rgba(0, 0, 0, 0.34),
    inset 0 0 28px rgba(127, 112, 255, 0.13);
  backdrop-filter: blur(18px);
  overflow: hidden;
}

.feature-card::before,
.info-card::before,
.workflow-panel::before,
.step-card::before,
.video-panel::before,
.faq-panel::before {
  position: absolute;
  inset: 0;
  pointer-events: none;
  content: "";
  background: linear-gradient(120deg, transparent, rgba(118, 231, 255, 0.12), transparent);
  transform: translateX(-100%);
  transition: transform 0.8s var(--ease);
}

.feature-card:hover::before,
.info-card:hover::before,
.workflow-panel:hover::before,
.step-card:hover::before,
.video-panel:hover::before,
.faq-panel:hover::before {
  transform: translateX(100%);
}

.feature-card {
  min-height: 190px;
  padding: 28px;
}

.feature-card h2,
.info-card h2,
.step-card h2 {
  margin-bottom: 12px;
  font-size: clamp(21px, 1.7vw, 28px);
}

.feature-card p,
.info-card p,
.workflow-panel p,
.step-card p {
  margin: 0;
  color: var(--soft);
  font-size: 15px;
  line-height: 1.8;
}

.feature-icon,
.info-icon {
  display: block;
  width: 54px;
  height: 54px;
  margin-bottom: 22px;
  border: 1px solid rgba(186, 198, 255, 0.36);
  border-radius: 16px;
  background:
    radial-gradient(circle at 30% 20%, rgba(255, 255, 255, 0.78), transparent 20%),
    linear-gradient(135deg, rgba(158, 98, 255, 0.9), rgba(51, 203, 255, 0.8));
  box-shadow: 0 0 28px rgba(103, 221, 255, 0.42);
}

.icon-canvas {
  clip-path: polygon(12% 20%, 88% 20%, 88% 72%, 56% 72%, 48% 88%, 40% 72%, 12% 72%);
}

.icon-story {
  border-radius: 50% 50% 18px 18px;
}

.icon-video {
  clip-path: polygon(10% 20%, 90% 20%, 90% 80%, 10% 80%);
}

.icon-assets {
  border-radius: 50%;
}

.workflow {
  padding: 50px 0 100px;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 36px;
}

.section-heading h2 {
  margin-bottom: 14px;
  font-size: clamp(36px, 4vw, 72px);
  line-height: 1.1;
  text-shadow: 0 0 34px rgba(153, 99, 255, 0.58);
}

.section-heading p {
  color: var(--muted);
  font-size: clamp(17px, 1.4vw, 22px);
  line-height: 1.8;
}

.workflow-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.workflow-panel {
  min-height: 220px;
  padding: 34px;
}

.workflow-panel strong,
.step-card strong {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 58px;
  height: 58px;
  margin-bottom: 24px;
  border: 1px solid rgba(221, 229, 255, 0.5);
  border-radius: 50%;
  background: radial-gradient(circle at 30% 20%, rgba(255, 255, 255, 0.35), rgba(148, 91, 255, 0.55));
  box-shadow: 0 0 26px rgba(161, 112, 255, 0.6);
  color: #fff;
  font-size: 20px;
}

.workflow-panel h3 {
  margin-bottom: 12px;
  font-size: 28px;
}

.download-hero,
.tutorial-hero {
  display: grid;
  gap: 28px;
}

.download-card {
  display: grid;
  grid-template-columns: minmax(430px, 0.9fr) minmax(520px, 1.1fr);
  gap: 36px;
  align-items: center;
  min-height: 560px;
  padding: clamp(28px, 5vw, 70px);
  border: 1px solid rgba(196, 212, 255, 0.36);
  border-radius: 30px;
  background:
    radial-gradient(circle at 12% 0%, rgba(161, 91, 255, 0.28), transparent 36%),
    linear-gradient(135deg, rgba(255, 255, 255, 0.09), rgba(92, 113, 255, 0.06)),
    rgba(8, 13, 34, 0.66);
  box-shadow: var(--shadow), inset 0 0 55px rgba(122, 112, 255, 0.14);
  backdrop-filter: blur(20px);
}

.download-copy h1,
.tutorial-copy h1 {
  font-size: clamp(48px, 6.4vw, 100px);
}

.download-copy h1 {
  font-size: clamp(52px, 5.2vw, 88px);
  white-space: nowrap;
}

.download-copy p {
  margin-bottom: 38px;
  color: var(--muted);
  font-size: clamp(20px, 1.8vw, 30px);
  font-weight: 800;
}

.download-preview,
.tutorial-board {
  position: relative;
  border: 1px solid rgba(210, 222, 255, 0.3);
  border-radius: 22px;
  overflow: hidden;
  box-shadow:
    0 30px 90px rgba(0, 0, 0, 0.46),
    0 0 70px rgba(103, 217, 255, 0.14);
}

.download-preview img,
.tutorial-board img {
  display: block;
  width: 100%;
  height: auto;
  transform: scale(1.01);
  transition: transform 1.1s var(--ease), filter 1.1s var(--ease);
}

.download-preview:hover img,
.tutorial-board:hover img {
  filter: saturate(1.15) brightness(1.08);
  transform: scale(1.045);
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.info-card {
  min-height: 210px;
  padding: 30px;
}

.monitor {
  border-radius: 10px;
}

.cube {
  clip-path: polygon(50% 0, 95% 25%, 95% 76%, 50% 100%, 5% 76%, 5% 25%);
}

.list {
  border-radius: 8px;
}

.star {
  clip-path: polygon(50% 0, 60% 36%, 98% 36%, 67% 57%, 78% 96%, 50% 72%, 22% 96%, 33% 57%, 2% 36%, 40% 36%);
}

.tutorial-hero {
  grid-template-columns: minmax(300px, 0.7fr) minmax(560px, 1.3fr);
  align-items: start;
}

.tutorial-copy {
  padding-top: 38px;
}

.tutorial-copy,
.steps-chain,
.tutorial-lower {
  position: relative;
  z-index: 2;
}

.tutorial-board {
  max-height: 620px;
}

.steps-chain {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 18px;
}

.steps-chain::before {
  position: absolute;
  top: 42px;
  right: 7%;
  left: 7%;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, transparent, var(--cyan), var(--violet), var(--cyan), transparent);
  box-shadow: 0 0 20px rgba(107, 227, 255, 0.85);
  content: "";
  animation: guidePulse 2.8s ease-in-out infinite;
}

.step-card {
  min-height: 250px;
  padding: 28px;
}

.step-card strong {
  position: relative;
  z-index: 2;
  margin-bottom: 18px;
}

.tutorial-lower {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(320px, 0.78fr);
  gap: 24px;
}

.video-panel,
.faq-panel {
  padding: 28px;
}

.video-panel h2,
.faq-panel h2 {
  margin-bottom: 20px;
  font-size: 26px;
}

.video-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.video-card {
  display: grid;
  min-height: 145px;
  padding: 20px;
  place-items: center;
  border: 1px solid rgba(202, 216, 255, 0.3);
  border-radius: 18px;
  background:
    radial-gradient(circle at 50% 35%, rgba(102, 221, 255, 0.22), transparent 34%),
    rgba(10, 14, 38, 0.64);
  color: #fff;
  cursor: pointer;
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease), box-shadow 0.28s var(--ease);
}

.video-card:hover {
  border-color: rgba(122, 236, 255, 0.7);
  box-shadow: 0 18px 46px rgba(84, 115, 255, 0.28);
  transform: translateY(-6px);
}

.play-large,
.play-dot {
  display: inline-block;
  width: 42px;
  aspect-ratio: 1;
  border: 1px solid rgba(235, 241, 255, 0.7);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.18), rgba(140, 91, 255, 0.22));
  box-shadow: 0 0 24px rgba(147, 107, 255, 0.5);
}

.play-dot {
  width: 30px;
}

.play-large::after,
.play-dot::after {
  display: block;
  width: 0;
  height: 0;
  margin: 12px 0 0 16px;
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
  border-left: 12px solid #fff;
  content: "";
}

.play-dot::after {
  margin: 8px 0 0 11px;
  border-top-width: 6px;
  border-bottom-width: 6px;
  border-left-width: 9px;
}

.faq-item {
  display: grid;
  grid-template-columns: 1fr auto;
  width: 100%;
  min-height: 52px;
  align-items: center;
  margin-bottom: 12px;
  padding: 14px 16px 14px 18px;
  border: 1px solid rgba(199, 214, 255, 0.24);
  border-radius: 13px;
  background: rgba(4, 8, 24, 0.42);
  color: #fff;
  cursor: pointer;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease), transform 0.25s var(--ease);
}

.faq-item:hover {
  border-color: rgba(126, 235, 255, 0.6);
  background: rgba(31, 34, 78, 0.64);
  transform: translateX(4px);
}

.faq-item i {
  grid-column: 2;
  grid-row: 1;
  width: 12px;
  aspect-ratio: 1;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform 0.25s var(--ease);
}

.faq-item.open i {
  transform: rotate(-135deg);
}

.faq-item small {
  grid-column: 1 / -1;
  display: block;
  max-height: 0;
  overflow: hidden;
  color: rgba(226, 232, 255, 0.7);
  line-height: 1.7;
  opacity: 0;
  transition: max-height 0.28s var(--ease), opacity 0.28s var(--ease), margin-top 0.28s var(--ease);
}

.faq-item.open small {
  max-height: 80px;
  margin-top: 8px;
  opacity: 1;
}

.icon-download,
.windows-mark,
.book-mark,
.spark {
  display: inline-block;
  flex: 0 0 auto;
}

.icon-download {
  width: 18px;
  height: 22px;
  border-bottom: 2px solid currentColor;
  position: relative;
}

.icon-download::before,
.icon-download::after {
  position: absolute;
  content: "";
}

.icon-download::before {
  left: 8px;
  top: 0;
  width: 2px;
  height: 15px;
  background: currentColor;
}

.icon-download::after {
  left: 4px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
}

.windows-mark {
  width: 26px;
  height: 26px;
  background:
    linear-gradient(90deg, transparent 46%, rgba(68, 120, 255, 0.7) 47% 52%, transparent 53%),
    linear-gradient(0deg, transparent 46%, rgba(68, 120, 255, 0.7) 47% 52%, transparent 53%),
    #fff;
  clip-path: polygon(0 8%, 46% 2%, 46% 48%, 0 48%, 0 8%, 54% 1%, 100% 0, 100% 48%, 54% 48%, 54% 1%, 0 52%, 46% 52%, 46% 98%, 0 92%, 0 52%, 54% 52%, 100% 52%, 100% 100%, 54% 99%, 54% 52%);
}

.book-mark {
  position: relative;
  width: 30px;
  height: 24px;
  border: 2px solid currentColor;
  border-radius: 5px 8px 8px 5px;
  opacity: 0.9;
}

.book-mark::before {
  position: absolute;
  top: 2px;
  bottom: 2px;
  left: 12px;
  width: 2px;
  border-radius: 99px;
  background: currentColor;
  opacity: 0.7;
  content: "";
}

.spark {
  width: 26px;
  aspect-ratio: 1;
  background: currentColor;
  clip-path: polygon(50% 0, 61% 38%, 100% 50%, 61% 62%, 50% 100%, 39% 62%, 0 50%, 39% 38%);
  filter: drop-shadow(0 0 12px rgba(255, 255, 255, 0.9));
}

.tilt-card {
  transform-style: preserve-3d;
  transition:
    transform 0.26s var(--ease),
    border-color 0.26s var(--ease),
    box-shadow 0.26s var(--ease);
}

.tilt-card:hover {
  border-color: rgba(121, 236, 255, 0.66);
  box-shadow:
    0 28px 78px rgba(0, 0, 0, 0.38),
    0 0 42px rgba(118, 232, 255, 0.18),
    inset 0 0 32px rgba(149, 112, 255, 0.18);
  transform: translateY(-9px);
}

.reveal {
  opacity: 0;
  transform: translateY(28px) scale(0.985);
  transition: opacity 0.75s var(--ease), transform 0.75s var(--ease);
}

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

.delay-1 {
  transition-delay: 0.14s;
}

.delay-2 {
  transition-delay: 0.28s;
}

.site-footer {
  display: flex;
  width: min(calc(100% - 44px), var(--max));
  min-height: 96px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin: 0 auto;
  border-top: 1px solid rgba(196, 212, 255, 0.2);
  color: rgba(230, 235, 255, 0.76);
}

.footer-brand,
.footer-records {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
}

.footer-brand {
  font-weight: 700;
}

.footer-brand span + span,
.footer-records a {
  font-size: 13px;
  font-weight: 500;
  color: rgba(230, 235, 255, 0.68);
}

.footer-records {
  justify-content: flex-end;
}

.footer-records a {
  text-decoration: none;
  transition: color 0.2s var(--ease), text-shadow 0.2s var(--ease);
}

.footer-records a:hover {
  color: rgba(255, 255, 255, 0.92);
  text-shadow: 0 0 16px rgba(127, 168, 255, 0.42);
}

@keyframes starDrift {
  from {
    transform: translate3d(0, 0, 0);
  }
  to {
    transform: translate3d(-160px, 110px, 0);
  }
}

@keyframes gridFlow {
  from {
    background-position: 0 0;
  }
  to {
    background-position: 96px 96px;
  }
}

@keyframes orbitGlow {
  0% {
    opacity: 0.7;
    transform: rotate(0deg) scale(1);
  }
  50% {
    opacity: 1;
    transform: rotate(180deg) scale(1.04);
  }
  100% {
    opacity: 0.7;
    transform: rotate(360deg) scale(1);
  }
}

@keyframes pulseStar {
  0%,
  100% {
    transform: scale(1);
    opacity: 0.38;
  }
  50% {
    transform: scale(1.28);
    opacity: 0.72;
  }
}

@keyframes buttonSweep {
  0%,
  42% {
    transform: translateX(-120%);
  }
  70%,
  100% {
    transform: translateX(120%);
  }
}

@keyframes floatPanel {
  0%,
  100% {
    translate: 0 0;
  }
  50% {
    translate: 0 -18px;
  }
}

@keyframes cardReveal {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-12px);
  }
}

@keyframes guidePulse {
  0%,
  100% {
    opacity: 0.45;
    filter: brightness(1);
  }
  50% {
    opacity: 1;
    filter: brightness(1.4);
  }
}

@media (max-width: 1180px) {
  .site-header {
    grid-template-columns: auto 1fr auto;
  }

  .site-nav {
    gap: 34px;
  }

  .hero,
  .download-card,
  .tutorial-hero {
    grid-template-columns: 1fr;
  }

  .hero-stage {
    min-height: 520px;
  }

  .concept-img,
  .glass-preview {
    right: 50%;
    width: min(860px, 96vw);
    transform: translateX(50%) rotateY(-5deg) rotateX(2deg);
  }

  .feature-strip,
  .info-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 10px;
  }

  .steps-chain {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .steps-chain::before {
    display: none;
  }

  .tutorial-lower,
  .video-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 820px) {
  .site-header {
    top: 10px;
    width: min(calc(100% - 20px), 1580px);
    min-height: 64px;
    padding: 0 14px;
  }

  .brand span:last-child {
    font-size: 20px;
  }

  .brand-mark {
    width: 34px;
  }

  .nav-toggle {
    display: block;
    justify-self: end;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    left: 0;
    display: grid;
    gap: 4px;
    padding: 12px;
    border: 1px solid rgba(202, 218, 255, 0.24);
    border-radius: 22px;
    background: rgba(6, 10, 28, 0.92);
    box-shadow: 0 24px 70px rgba(0, 0, 0, 0.42);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
  }

  .site-nav.open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .site-nav a {
    padding: 14px 16px;
  }

  .header-cta {
    display: none;
  }

  .hero,
  .download-hero,
  .tutorial-hero {
    padding-top: 110px;
  }

  .section-shell {
    width: min(calc(100% - 28px), var(--max));
  }

  h1 {
    font-size: clamp(48px, 16vw, 72px);
  }

  .hero-subtitle {
    font-size: 21px;
    letter-spacing: 0.06em;
  }

  .hero-stage {
    min-height: 430px;
  }

  .glass-preview {
    width: min(720px, 100%);
  }

  .concept-img {
    width: min(820px, 118vw);
    opacity: 0.34;
  }

  .feature-strip,
  .info-grid,
  .workflow-grid,
  .steps-chain {
    grid-template-columns: 1fr;
  }

  .feature-card,
  .info-card,
  .workflow-panel,
  .step-card {
    min-height: auto;
    padding: 24px;
  }

  .download-card {
    padding: 22px;
  }

  .download-copy h1 {
    font-size: clamp(44px, 13vw, 68px);
    white-space: normal;
  }

  .btn,
  .btn-wide {
    width: 100%;
    min-width: 0;
  }

  .site-footer {
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}