/* Agents Uni — Custom styles (Tailwind CDN handles utility classes) */

/* ─── CSS Variables ─── */
:root {
  --accent-1: #8b5cf6; /* violet-500 */
  --accent-2: #3b82f6; /* blue-500 */
  --accent-3: #10b981; /* emerald-500 */
  --accent-4: #f59e0b; /* amber-500 */
  --bg-primary: #030712; /* gray-950 */
  --bg-card: #111827;    /* gray-900 */
  --bg-card-hover: #1f2937; /* gray-800 */
  --border: #374151;     /* gray-700 */
  --text-primary: #f3f4f6; /* gray-100 */
  --text-secondary: #9ca3af; /* gray-400 */
}

/* ─── Global ─── */
html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
}

/* ─── Gradient text ─── */
.gradient-text {
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ─── Gradient border card (mask technique) ─── */
.gradient-border {
  position: relative;
  background: var(--bg-card);
  border-radius: 0.75rem;
}

.gradient-border::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: 0.8rem;
  padding: 1px;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

/* ─── Code block ─── */
.code-block {
  background: #0d1117;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1rem 1.25rem;
  font-family: 'SF Mono', 'Fira Code', 'JetBrains Mono', monospace;
  font-size: 0.875rem;
  line-height: 1.6;
  overflow-x: auto;
}

.code-block .comment { color: #6e7681; }
.code-block .keyword { color: #ff7b72; }
.code-block .string  { color: #a5d6ff; }
.code-block .func    { color: #d2a8ff; }
.code-block .type    { color: #79c0ff; }

/* ─── Hero glow ─── */
.hero-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.15) 0%, rgba(59, 130, 246, 0.05) 40%, transparent 70%);
  pointer-events: none;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation: hero-pulse 6s ease-in-out infinite;
}

@keyframes hero-pulse {
  0%, 100% {
    opacity: 0.7;
    transform: translate(-50%, -50%) scale(1);
  }
  50% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.15);
  }
}

/* ─── Scroll-triggered fade-in ─── */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ─── Nav ─── */
nav {
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

/* ─── Feature card ─── */
.feature-card {
  transition: transform 0.25s ease, box-shadow 0.25s ease, background-color 0.25s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  background-color: var(--bg-card-hover);
  box-shadow:
    0 0 0 1px rgba(139, 92, 246, 0.15),
    0 8px 24px rgba(139, 92, 246, 0.08);
}

/* ─── Copy button ─── */
.copy-btn {
  opacity: 0;
  transition: opacity 0.2s ease;
}

.code-block:hover .copy-btn,
.copy-btn:focus {
  opacity: 1;
}

/* ─── Demo badge ─── */
.demo-badge {
  background: linear-gradient(135deg, #374151, #4b5563);
  font-size: 0.625rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.125rem 0.5rem;
  border-radius: 9999px;
  color: var(--text-secondary);
  display: inline-block;
}

/* ─── Stat number (counter animation) ─── */
.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ─── Mobile hamburger menu ─── */
#mobileMenu {
  display: none;
  position: fixed;
  top: 3.5rem; /* below nav h-14 */
  left: 0;
  right: 0;
  background: rgba(3, 7, 18, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(55, 65, 81, 0.5);
  padding: 1rem 1.5rem;
  z-index: 40;
  flex-direction: column;
  gap: 0.75rem;
  transform: translateY(-100%);
  opacity: 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

#mobileMenu.open {
  display: flex;
  transform: translateY(0);
  opacity: 1;
}

#mobileMenu a {
  display: block;
  padding: 0.5rem 0;
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: color 0.2s ease;
}

#mobileMenu a:hover {
  color: var(--text-primary);
}

/* ─── Architecture SVG ─── */
.arch-node {
  fill: var(--bg-card);
  stroke: var(--accent-1);
  stroke-width: 1.5;
  rx: 8;
  transition: fill 0.2s ease, stroke 0.2s ease, filter 0.2s ease;
}

.arch-node:hover {
  fill: var(--bg-card-hover);
  stroke: var(--accent-2);
  filter: drop-shadow(0 0 8px rgba(139, 92, 246, 0.3));
  cursor: pointer;
}

.arch-node.highlighted {
  stroke: var(--accent-2);
  stroke-width: 2;
  filter: drop-shadow(0 0 12px rgba(59, 130, 246, 0.4));
}

.arch-line {
  stroke: var(--accent-1);
  stroke-width: 2;
  fill: none;
  stroke-dasharray: 6 4;
  animation: arch-dash 20s linear infinite;
}

.arch-line.highlighted {
  stroke: var(--accent-2);
  stroke-width: 2.5;
}

@keyframes arch-dash {
  to {
    stroke-dashoffset: -200;
  }
}

/* ─── Typewriter ─── */
.typewriter {
  display: inline-block;
  overflow: hidden;
  white-space: nowrap;
  border-right: 2px solid var(--accent-1);
  animation: blink-caret 0.75s step-end infinite;
}

.typewriter.done {
  border-right-color: transparent;
}

@keyframes blink-caret {
  from, to { border-color: transparent; }
  50% { border-color: var(--accent-1); }
}

/* ─── Use-case card ─── */
.use-case-card {
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.use-case-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

/* ─── Responsive ─── */

/* Large tablets / small desktops */
@media (max-width: 1024px) {
  .hero-glow {
    width: 480px;
    height: 480px;
  }

  .stat-number {
    font-size: 2rem;
  }
}

/* Tablets */
@media (max-width: 768px) {
  .hero-glow {
    width: 320px;
    height: 320px;
  }

  .stat-number {
    font-size: 1.75rem;
  }

  .code-block {
    font-size: 0.8rem;
    padding: 0.75rem 1rem;
  }
}

/* Small phones */
@media (max-width: 480px) {
  .hero-glow {
    width: 240px;
    height: 240px;
  }

  .stat-number {
    font-size: 1.5rem;
  }

  .code-block {
    font-size: 0.75rem;
    padding: 0.625rem 0.75rem;
  }

  .gradient-border {
    border-radius: 0.5rem;
  }

  .gradient-border::before {
    border-radius: 0.6rem;
  }
}