/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:       #1a1a1a;
  --surface:  #222222;
  --surface2: #2a2a2a;
  --border:   rgba(255,255,255,0.08);
  --text:     #9a9a9a;
  --text-dim: #606060;
  --white:    #e0e0e0;
  --accent:   #00d4ff;
  --accent-dim: rgba(0,212,255,0.1);
  --accent-glow: rgba(0,212,255,0.05);
  /* AutoCAD classic layer colors */
  --cad-red:     #ff3333;
  --cad-yellow:  #ffff00;
  --cad-green:   #00ff00;
  --cad-cyan:    #00ffff;
  --cad-blue:    #4488ff;
  --cad-magenta: #ff44ff;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Sans', system-ui, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection {
  background: rgba(0,212,255,0.25);
  color: var(--white);
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Canvas ── */
#cad-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* ── Nav ── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  background: rgba(12,12,14,0.8);
}

.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--white);
  text-decoration: none;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.02em;
}

.logo-icon {
  width: 28px;
  height: 28px;
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--white);
}

.nav-cta {
  font-size: 13px;
  font-weight: 600;
  color: var(--bg);
  background: var(--accent);
  padding: 8px 18px;
  border-radius: 8px;
  text-decoration: none;
  transition: all 0.2s;
}

.nav-cta:hover {
  background: #33dfff;
  transform: translateY(-1px);
}

/* ── Hero ── */
.hero {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  align-items: center;
  gap: 48px;
  padding: 120px 48px 80px;
  max-width: 1500px;
  margin: 0 auto;
  overflow: visible;
}

.hero-content {
  max-width: 560px;
  text-align: left;
}

.hero-badge {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid rgba(201,168,76,0.15);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 32px;
  letter-spacing: 0.02em;
}

.hero h1 {
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 800;
  color: var(--white);
  line-height: 1.08;
  letter-spacing: -0.035em;
  margin-bottom: 24px;
}

.hero-sub {
  font-size: 18px;
  line-height: 1.7;
  color: var(--text);
  max-width: 540px;
  margin: 0 auto 40px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: flex-start;
  margin-bottom: 56px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--bg);
  background: var(--accent);
  padding: 12px 28px;
  border-radius: 10px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 2px 16px rgba(0,212,255,0.2);
}

.btn-primary:hover {
  background: #33dfff;
  transform: translateY(-1px);
  box-shadow: 0 4px 24px rgba(0,212,255,0.3);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.03);
  padding: 12px 28px;
  border-radius: 10px;
  text-decoration: none;
  transition: all 0.2s;
}

.btn-ghost:hover {
  border-color: rgba(255,255,255,0.12);
  color: var(--white);
  background: rgba(255,255,255,0.05);
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 32px;
}

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

.stat-value {
  font-size: 22px;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 2px;
}

.stat-divider {
  width: 1px;
  height: 32px;
  background: var(--border);
}

/* ── Section headers ── */
.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-header h2 {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.section-header p {
  font-size: 17px;
  color: var(--text);
}

/* ── Screenshots ── */
.hero-screenshot {
  position: relative;
  z-index: 1;
  width: 100%;
  perspective: 900px;
}

.screenshot-section {
  position: relative;
  z-index: 1;
  padding: 120px 0;
  perspective: 900px;
}

.screenshot-section > .container {
  max-width: 1400px;
}

.screenshot-frame {
  border-radius: 14px;
  overflow: hidden;
  box-shadow:
    0 12px 48px rgba(0,0,0,0.6),
    0 32px 96px rgba(0,0,0,0.4),
    0 0 0 1px rgba(255,255,255,0.06);
  transform: rotateX(4deg) rotateY(-3deg);
  transform-origin: center center;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.23,1,0.32,1), box-shadow 0.6s ease;
}

.screenshot-frame:hover {
  transform: rotateX(1deg) rotateY(-0.5deg);
  box-shadow:
    0 16px 56px rgba(0,0,0,0.6),
    0 40px 120px rgba(0,0,0,0.45),
    0 0 0 1px rgba(0,212,255,0.12),
    0 0 100px rgba(0,212,255,0.04);
}

.screenshot-svg {
  display: block;
  width: 100%;
  height: auto;
}

/* Alternate skew direction for variety */
.screenshot-section:nth-of-type(even) .screenshot-frame {
  transform: rotateX(4deg) rotateY(3deg);
}
.screenshot-section:nth-of-type(even) .screenshot-frame:hover {
  transform: rotateX(1deg) rotateY(0.5deg);
}

/* ── Before / After ── */
.before-after {
  position: relative;
  z-index: 1;
  padding: 120px 0;
}

.ba-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 24px;
  align-items: center;
}

.ba-card {
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 32px;
  overflow: hidden;
}

.ba-before { border-color: rgba(255,51,51,0.1); }
.ba-after { border-color: rgba(201,168,76,0.15); }

.ba-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #ff5050;
  margin-bottom: 20px;
}

.ba-label-good { color: var(--accent); }

.ba-visual {
  background: var(--bg);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 24px;
  border: 1px solid var(--border);
}

.ba-svg {
  width: 100%;
  height: auto;
}

.ba-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.ba-list li {
  font-size: 14px;
  color: var(--text);
  padding-left: 20px;
  position: relative;
}

.ba-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 7px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,51,51,0.3);
}

.ba-list-good li::before {
  background: rgba(201,168,76,0.4);
}

.ba-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
}

.ba-arrow svg {
  width: 40px;
  height: 40px;
}

/* ── Features ── */
.features {
  position: relative;
  z-index: 1;
  padding: 120px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  border-radius: 16px;
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 32px;
  transition: all 0.3s ease;
}

.feature-card:hover {
  border-color: rgba(0,212,255,0.12);
  background: var(--surface2);
  transform: translateY(-2px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--accent);
}

.feature-icon svg {
  width: 28px;
  height: 28px;
}

.feature-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.feature-card p {
  font-size: 14px;
  line-height: 1.65;
  color: var(--text);
}

/* ── Workflow ── */
.workflow {
  position: relative;
  z-index: 1;
  padding: 120px 0;
}

.steps {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.step {
  display: grid;
  grid-template-columns: 60px 1px 1fr 240px;
  gap: 32px;
  align-items: start;
  padding: 40px 0;
}

.step-num {
  font-size: 32px;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.04em;
  text-align: center;
  opacity: 0.6;
}

.step-line {
  width: 1px;
  height: 100%;
  min-height: 100px;
  background: linear-gradient(180deg, var(--accent) 0%, transparent 100%);
  opacity: 0.2;
  justify-self: center;
}

.step-content h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.step-content p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  max-width: 420px;
}

.step-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
}

.step-visual svg {
  width: 100%;
  height: auto;
}

/* ── Components ── */
.components {
  position: relative;
  z-index: 1;
  padding: 120px 0;
}

.comp-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.comp-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 32px 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--surface);
  transition: all 0.3s ease;
}

.comp-card:hover {
  border-color: rgba(0,212,255,0.15);
  background: var(--surface2);
  transform: translateY(-2px);
}

.comp-svg {
  width: 56px;
  height: 56px;
  color: var(--accent);
}

.comp-card span {
  font-size: 14px;
  font-weight: 600;
  color: var(--white);
  letter-spacing: -0.01em;
}

/* ── CTA ── */
.cta {
  position: relative;
  z-index: 1;
  padding: 120px 0;
}

.cta-box {
  position: relative;
  text-align: center;
  border-radius: 20px;
  border: 1px solid rgba(0,212,255,0.12);
  background: var(--surface);
  padding: 72px 48px;
  overflow: hidden;
}

.cta-drawing {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.cta-svg {
  width: 100%;
  max-width: 500px;
  opacity: 0.6;
}

.cta-box h2 {
  position: relative;
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.cta-box p {
  position: relative;
  font-size: 16px;
  color: var(--text);
  margin-bottom: 32px;
}

.cta-form {
  position: relative;
  display: flex;
  gap: 10px;
  justify-content: center;
  max-width: 420px;
  margin: 0 auto 16px;
}

.cta-input {
  flex: 1;
  padding: 12px 18px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--white);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
}

.cta-input::placeholder {
  color: var(--text-dim);
}

.cta-input:focus {
  border-color: rgba(0,212,255,0.3);
}

.cta-note {
  position: relative;
  font-size: 12px;
  color: var(--text-dim);
}

/* ── Footer ── */
footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 32px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.footer-logo {
  font-weight: 700;
  color: var(--white);
  font-size: 15px;
}

.footer-tagline {
  font-size: 13px;
  color: var(--text-dim);
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 13px;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--white);
}

/* ── Scroll animations ── */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .comp-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .step {
    grid-template-columns: 48px 1px 1fr;
  }
  .step-visual {
    display: none;
  }
}

@media (max-width: 1024px) {
  .hero {
    grid-template-columns: 1fr;
    padding: 120px 24px 60px;
    text-align: center;
  }
  .hero-content {
    max-width: 600px;
    text-align: center;
    margin: 0 auto;
  }
  .hero-actions { justify-content: center; }
  .hero-stats { justify-content: center; }
  .stat { align-items: center; }
  .hero-screenshot { max-width: 800px; margin: 0 auto; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }

  .ba-grid {
    grid-template-columns: 1fr;
  }
  .ba-arrow {
    transform: rotate(90deg);
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .comp-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-stats {
    flex-direction: column;
    gap: 16px;
  }
  .stat-divider {
    width: 48px;
    height: 1px;
  }
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  .cta-form {
    flex-direction: column;
  }
  .cta-box {
    padding: 48px 24px;
  }
  .footer-inner {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
  .footer-left {
    flex-direction: column;
    gap: 4px;
  }
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.08); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.15); }