/* ===========================
   CSS Variables & Reset
   =========================== */
:root {
  --bg:        #0b0d17;
  --bg-alt:    #10132a;
  --surface:   rgba(255, 255, 255, 0.04);
  --glass:     rgba(255, 255, 255, 0.06);
  --glass-b:   rgba(255, 255, 255, 0.12);
  --text:      #e2e4ed;
  --text-dim:  #8a8fa8;
  --accent1:   #7b2ff7;
  --accent2:   #00c6ff;
  --glow1:     rgba(123, 47, 247, .35);
  --glow2:     rgba(0, 198, 255, .25);
  --radius:    16px;
  --max-w:     1120px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  overflow-x: hidden;
}

img, svg { max-width: 100%; display: block; }
a { color: var(--accent2); text-decoration: none; }

/* ===========================
   Utility
   =========================== */
.container {
  width: 90%;
  max-width: var(--max-w);
  margin: 0 auto;
}

.section {
  padding: 100px 0;
}

.alt-bg {
  background: var(--bg-alt);
}

h2 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  text-align: center;
  margin-bottom: .4em;
  background: linear-gradient(135deg, var(--accent1), var(--accent2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-sub {
  text-align: center;
  color: var(--text-dim);
  margin-bottom: 3rem;
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
}

/* ===========================
   Reveal-on-scroll
   =========================== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .7s ease, transform .7s ease;
}

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

/* ===========================
   Glass Card
   =========================== */
.glass {
  background: var(--glass);
  border: 1px solid var(--glass-b);
  border-radius: var(--radius);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.card {
  padding: 2rem;
  transition: transform .3s ease, box-shadow .3s ease;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px var(--glow1);
}

/* ===========================
   HERO
   =========================== */
#hero {
  position: relative;
  height: 100vh;
  min-height: 520px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}

#hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-content h1 {
  font-size: clamp(2.6rem, 7vw, 5.5rem);
  font-weight: 800;
  letter-spacing: -1px;
  background: linear-gradient(135deg, var(--accent1), var(--accent2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: .25em;
}

.subtitle {
  font-size: clamp(1rem, 2.5vw, 1.35rem);
  color: var(--text-dim);
  margin-bottom: 2rem;
}

.cta-btn {
  display: inline-block;
  padding: .75em 2em;
  border-radius: 40px;
  background: linear-gradient(135deg, var(--accent1), var(--accent2));
  color: #fff;
  font-weight: 600;
  font-size: 1rem;
  transition: box-shadow .3s ease, transform .3s ease;
}

.cta-btn:hover {
  box-shadow: 0 0 24px var(--glow1), 0 0 48px var(--glow2);
  transform: scale(1.05);
}

/* ===========================
   WHAT Section (two-col)
   =========================== */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  margin-top: 2rem;
}

.two-col p {
  font-size: 1.1rem;
  color: var(--text-dim);
  line-height: 1.8;
}

.illustration {
  width: 100%;
  max-width: 340px;
  margin: 0 auto;
}

/* ===========================
   COMPARE Section – Before / After Slider
   =========================== */
.ba-wrapper {
  margin-top: 2rem;
}

.ba-container {
  position: relative;
  width: 100%;
  max-width: 700px;
  margin: 0 auto;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius);
  overflow: hidden;
  cursor: col-resize;
  border: 1px solid var(--glass-b);
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
}

.ba-layer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.ba-layer svg {
  width: 100%;
  height: 100%;
  display: block;
}

.ba-after {
  clip-path: inset(0 0 0 50%);
}

.ba-divider {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 3px;
  transform: translateX(-50%);
  z-index: 5;
  pointer-events: none;
}

.ba-line {
  position: absolute;
  inset: 0;
  width: 100%;
  background: var(--accent2);
  box-shadow: 0 0 8px var(--glow2), 0 0 20px var(--glow2);
}

.ba-handle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: auto;
  filter: drop-shadow(0 0 6px rgba(0, 198, 255, .5));
  transition: filter .2s ease;
}

.ba-handle:hover {
  filter: drop-shadow(0 0 12px rgba(0, 198, 255, .8));
}

.ba-handle svg {
  display: block;
  width: 40px;
  height: 40px;
}

/* ===========================
   BENEFITS Section
   =========================== */
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.card-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 1rem;
}

.benefits-grid h3 {
  font-size: 1.1rem;
  margin-bottom: .4em;
}

.benefits-grid p {
  font-size: .95rem;
  color: var(--text-dim);
}

/* ===========================
   USE CASES Section
   =========================== */
.uses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
  text-align: center;
}

.use-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .75rem;
}

.use-item svg {
  width: 64px;
  height: 64px;
  transition: transform .3s ease;
}

.use-item:hover svg {
  transform: scale(1.15) rotate(4deg);
}

.use-item span {
  font-size: .95rem;
  color: var(--text-dim);
}

/* ===========================
   ANATOMY Section
   =========================== */
.anatomy-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.anatomy-card {
  padding: 1.5rem;
  text-align: center;
  transition: transform .3s ease, box-shadow .3s ease;
}

.anatomy-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px var(--glow1);
}

.anatomy-card svg {
  width: 80px;
  height: 80px;
  margin: 0 auto 1rem;
}

.anatomy-card h3 {
  font-size: 1.1rem;
  margin-bottom: .3em;
}

.anatomy-card p {
  font-size: .9rem;
  color: var(--text-dim);
}

.anatomy-illustration {
  margin-top: 3rem;
  padding: 1.5rem;
  border-radius: var(--radius);
  background: var(--surface);
  overflow-x: auto;
}

.anatomy-illustration svg {
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
}

/* ===========================
   FORMATS & TOOLS Section
   =========================== */
.formats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.format-card {
  padding: 1.8rem;
  text-align: center;
  transition: transform .3s ease, box-shadow .3s ease;
}

.format-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px var(--glow2);
}

.format-ext {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: .5rem;
  background: linear-gradient(135deg, var(--accent1), var(--accent2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.format-card p {
  font-size: .92rem;
  color: var(--text-dim);
}

.tools-heading {
  text-align: center;
  margin: 3rem 0 1.5rem;
  font-size: 1.3rem;
  color: var(--text);
}

.tools-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

.tool-pill {
  padding: .65em 1.5em;
  border-radius: 40px;
  font-size: .95rem;
  transition: transform .3s ease, box-shadow .3s ease;
}

.tool-pill:hover {
  transform: scale(1.06);
  box-shadow: 0 4px 20px var(--glow1);
}

.tool-pill small {
  color: var(--accent2);
  font-size: .8rem;
}

/* ===========================
   FOOTER
   =========================== */
#footer {
  padding: 3rem 0;
  text-align: center;
  border-top: 1px solid var(--glass-b);
}

#footer p {
  color: var(--text-dim);
  font-size: .95rem;
}

.footer-note {
  margin-top: .5rem;
  font-size: .8rem !important;
  opacity: .6;
}

/* ===========================
   RESPONSIVE
   =========================== */
@media (max-width: 768px) {
  .two-col {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 60px 0;
  }

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

  .ba-handle svg {
    width: 32px;
    height: 32px;
  }
}

@media (max-width: 480px) {
  .anatomy-grid {
    grid-template-columns: 1fr;
  }

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