:root {
  color-scheme: dark;
  --bg: #07111f;
  --bg-soft: rgba(12, 24, 40, 0.78);
  --panel: rgba(11, 20, 33, 0.82);
  --panel-border: rgba(160, 186, 224, 0.16);
  --text: #f5f7fb;
  --muted: #9eb0cb;
  --accent: #62d0ff;
  --accent-strong: #91f2ff;
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 999px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  font-family: "Segoe UI", "Inter", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(78, 176, 255, 0.16), transparent 28%),
    radial-gradient(circle at 85% 12%, rgba(53, 120, 255, 0.18), transparent 22%),
    linear-gradient(180deg, #09111d 0%, #050a13 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.8), transparent 88%);
  pointer-events: none;
}

.page-shell {
  width: min(1240px, calc(100% - 40px));
  margin: 0 auto;
  padding: 40px 0 72px;
}

.hero {
  width: 100%;
  padding: 36px 0 28px;
}

.hero-copy {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  text-align: center;
}

.eyebrow,
.section-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(137, 205, 255, 0.2);
  border-radius: var(--radius-sm);
  background: rgba(79, 136, 215, 0.12);
  color: #bee8ff;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 0.7rem 1rem;
}

.hero h1 {
  margin-top: 20px;
  font-size: clamp(2.6rem, 6vw, 5.2rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
}

.description {
  width: min(840px, 100%);
  margin: 18px auto 0;
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--muted);
}

.content-grid {
  display: grid;
  gap: 26px;
  margin-top: 24px;
}

.panel {
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-xl);
  background: linear-gradient(180deg, rgba(13, 24, 39, 0.92), rgba(8, 15, 26, 0.88));
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  padding: 26px;
}

.panel-head {
  display: grid;
  gap: 14px;
  margin-bottom: 22px;
}

.panel-head h2 {
  margin-top: 14px;
  font-size: clamp(1.6rem, 3vw, 2.5rem);
  line-height: 1.05;
}

.panel-head p,
.mini-demo-copy p {
  color: var(--muted);
  line-height: 1.7;
}

.comparison-card {
  display: grid;
  gap: 14px;
}

.comparison-frame {
  position: relative;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: #050b13;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
  user-select: none;
}

.comparison-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 0%, rgba(4, 8, 14, 0.05) 65%, rgba(4, 8, 14, 0.26) 100%);
  pointer-events: none;
}

.comparison-frame-compact {
  aspect-ratio: 4 / 3;
}

.image-wrapper {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.image-wrapper img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.image-before {
  z-index: 2;
  clip-path: inset(0 50% 0 0);
}

.image-after {
  z-index: 1;
  filter: saturate(1.05) contrast(1.03);
}

.label {
  position: absolute;
  top: 18px;
  z-index: 5;
  padding: 0.72rem 1rem;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-sm);
  background: rgba(4, 10, 18, 0.62);
  color: #ffffff;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  backdrop-filter: blur(10px);
}

.label-before {
  left: 18px;
}

.label-after {
  right: 18px;
}

.slider-line {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
  z-index: 4;
  pointer-events: none;
}

.slider-line::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 0%, rgba(255, 255, 255, 0.5) 14%, rgba(255, 255, 255, 0.95) 50%, rgba(255, 255, 255, 0.5) 86%, transparent 100%);
}

.slider-knob {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 6;
  width: 64px;
  height: 64px;
  border: 0;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: grab;
  background: linear-gradient(180deg, #f6fbff 0%, #bfefff 100%);
  box-shadow:
    0 15px 40px rgba(0, 0, 0, 0.32),
    0 0 0 10px rgba(120, 222, 255, 0.1);
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.slider-knob:hover,
.slider-knob:focus-visible {
  transform: translate(-50%, -50%) scale(1.04);
  box-shadow:
    0 18px 46px rgba(0, 0, 0, 0.36),
    0 0 0 14px rgba(120, 222, 255, 0.14);
  outline: none;
}

.slider-knob:active,
.comparison-instance.dragging .slider-knob {
  cursor: grabbing;
  transform: translate(-50%, -50%) scale(0.96);
}

.slider-knob svg {
  width: 24px;
  height: 24px;
  fill: #07111f;
}

.comparison-toolbar {
  display: grid;
  gap: 12px;
  padding: 2px 4px 0;
}

.stat-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 0.95rem;
}

.position-readout {
  min-width: 56px;
  text-align: right;
  color: #d6f5ff;
  font-weight: 700;
}

.preset-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.preset-button {
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  padding: 0.78rem 1rem;
  font: inherit;
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease, color 160ms ease, transform 160ms ease;
}

.preset-button:hover,
.preset-button:focus-visible {
  border-color: rgba(121, 215, 255, 0.6);
  background: rgba(121, 215, 255, 0.14);
  outline: none;
  transform: translateY(-1px);
}

.preset-button.is-active {
  border-color: rgba(121, 215, 255, 0.7);
  background: rgba(121, 215, 255, 0.18);
  color: #dcf9ff;
}

.demo-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.mini-demo {
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(13, 24, 39, 0.92), rgba(7, 14, 24, 0.92));
  padding: 18px;
}

.mini-demo-copy {
  margin-bottom: 16px;
}

.mini-demo-copy h3 {
  font-size: 1.28rem;
  margin-bottom: 10px;
}

.comparison-instance.dragging .image-before,
.comparison-instance.dragging .slider-line,
.comparison-instance.dragging .slider-knob {
  transition: none;
}

.image-before,
.slider-line,
.slider-knob {
  transition: left 120ms ease-out;
}

@media (max-width: 920px) {
  .page-shell {
    width: min(100% - 28px, 1240px);
    padding-top: 24px;
  }

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

  .hero h1 {
    line-height: 1;
  }
}

@media (max-width: 640px) {
  .panel {
    padding: 18px;
    border-radius: 24px;
  }

  .comparison-frame,
  .comparison-frame-compact {
    aspect-ratio: 4 / 3;
  }

  .slider-knob {
    width: 52px;
    height: 52px;
  }

  .slider-knob svg {
    width: 20px;
    height: 20px;
  }

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

  .label {
    top: 12px;
    padding: 0.6rem 0.8rem;
    font-size: 0.74rem;
  }

  .label-before {
    left: 12px;
  }

  .label-after {
    right: 12px;
  }
}