/* =============================================
   ButlerTC — Main Stylesheet
   ============================================= */

/* ----------- CSS Variables ----------- */
:root {
  --bg: #080C18;
  --bg-surface: #0D1526;
  --bg-card: #111827;
  --bg-card-hover: #141E30;
  --border: rgba(255, 255, 255, 0.07);
  --border-hover: rgba(255, 255, 255, 0.14);

  --accent-blue: #4F8EF7;
  --accent-blue-dim: rgba(79, 142, 247, 0.12);
  --accent-green: #34D399;
  --accent-green-dim: rgba(52, 211, 153, 0.12);
  --accent-purple: #A78BFA;
  --accent-purple-dim: rgba(167, 139, 250, 0.12);
  --accent-gold: #F59E0B;

  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-muted: #4B5563;

  --nav-height: 72px;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-full: 9999px;

  --shadow-card: 0 4px 32px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 60px rgba(79, 142, 247, 0.08);

  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);

  --font-display: 'Sora', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;

  --max-w: 1200px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-body);
  background-color: var(--bg);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, svg {
  display: block;
  max-width: 100%;
}

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

ul {
  list-style: none;
}

/* ----------- Layout ----------- */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 100px 0;
}

/* ----------- Navigation ----------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background var(--transition), box-shadow var(--transition);
}

.site-header.scrolled {
  background: rgba(8, 12, 24, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: opacity var(--transition);
}
.nav-logo:hover { opacity: 0.85; }

.logo-mark {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  background: linear-gradient(135deg, #4F8EF7, #7C3AED);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  color: white;
  flex-shrink: 0;
}

.logo-text strong {
  font-weight: 800;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition), background var(--transition);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.06);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ----------- Hero ----------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(79, 142, 247, 0.18) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(124, 58, 237, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero::before {
  content: '';
  position: absolute;
  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: 60px 60px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 70% 80% at 50% 50%, black, transparent);
}

.hero-content {
  position: relative;
  z-index: 1;
  padding-top: calc(var(--nav-height) + 60px);
  padding-bottom: 80px;
  max-width: 780px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(79, 142, 247, 0.12);
  border: 1px solid rgba(79, 142, 247, 0.25);
  color: var(--accent-blue);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 28px;
}
.hero-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-blue);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.gradient-text {
  background: linear-gradient(120deg, #4F8EF7 0%, #A78BFA 50%, #34D399 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin-bottom: 40px;
  line-height: 1.75;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.hero-scroll-hint {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  opacity: 0.4;
}
.hero-scroll-hint span {
  display: block;
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, transparent, var(--text-secondary));
  animation: scrollHint 2s ease-in-out infinite;
}
@keyframes scrollHint {
  0%, 100% { opacity: 0; transform: scaleY(0.5); transform-origin: top; }
  50% { opacity: 1; transform: scaleY(1); }
}

/* ----------- Buttons ----------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-body);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition);
  border: none;
  outline: none;
}

.btn-primary {
  background: linear-gradient(135deg, #4F8EF7, #7C3AED);
  color: white;
  box-shadow: 0 4px 24px rgba(79, 142, 247, 0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(79, 142, 247, 0.4);
}

.btn-ghost {
  color: var(--text-secondary);
  border: 1px solid var(--border-hover);
  background: transparent;
}
.btn-ghost:hover {
  color: var(--text-primary);
  background: rgba(255,255,255,0.05);
  transform: translateY(-2px);
}

/* ----------- Section Shared ----------- */
.section-label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-blue);
  margin-bottom: 16px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.section-title.centered { text-align: center; }

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  text-align: center;
  max-width: 540px;
  margin: 0 auto 64px;
  line-height: 1.7;
}

/* ----------- About ----------- */
.about {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-text p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 16px;
}
.about-text p:last-child { margin-bottom: 0; }

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: border-color var(--transition), transform var(--transition);
}
.stat-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
}

.stat-number {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  margin-bottom: 6px;
  background: linear-gradient(135deg, #4F8EF7, #A78BFA);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ----------- Divisions / Cards ----------- */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.card:hover {
  border-color: var(--border-hover);
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.card-icon svg {
  width: 24px;
  height: 24px;
}

.card-icon--green {
  background: var(--accent-green-dim);
  color: var(--accent-green);
}
.card-icon--purple {
  background: var(--accent-purple-dim);
  color: var(--accent-purple);
}
.card-icon--blue {
  background: var(--accent-blue-dim);
  color: var(--accent-blue);
}

.card-content h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.card-content p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 20px;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-blue);
  transition: gap var(--transition), opacity var(--transition);
  margin-top: auto;
}
.card-link:hover {
  gap: 10px;
  opacity: 0.85;
}

/* ----------- Platforms ----------- */
.apps {
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.platforms-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 20px;
}

.platform-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: border-color var(--transition), color var(--transition), transform var(--transition);
}
.platform-item:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
  transform: translateY(-4px);
}

.platform-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-blue);
  opacity: 0.8;
  transition: opacity var(--transition);
}
.platform-item:hover .platform-icon { opacity: 1; }
.platform-icon svg {
  width: 36px;
  height: 36px;
}

/* ----------- Contact ----------- */
.contact {
  background: var(--bg);
}

.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.contact-text p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 28px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contact-item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition);
}
.contact-item:hover { color: var(--accent-blue); }
.contact-item svg { width: 18px; height: 18px; flex-shrink: 0; }

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-top: 80px;
}

.contact-product-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  transition: border-color var(--transition), transform var(--transition), background var(--transition);
  color: var(--text-primary);
}
.contact-product-link:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateX(4px);
}
.contact-product-link div {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.contact-product-link strong {
  font-size: 1rem;
  font-weight: 600;
}
.contact-product-link span {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.contact-product-link svg {
  color: var(--text-muted);
  transition: color var(--transition);
  flex-shrink: 0;
}
.contact-product-link:hover svg {
  color: var(--accent-blue);
}

/* ----------- Footer ----------- */
.footer {
  border-top: 1px solid var(--border);
  background: var(--bg-surface);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 64px;
  padding: 64px 24px 48px;
}

.footer-brand {
  max-width: 300px;
}
.footer-brand .nav-logo {
  margin-bottom: 16px;
}
.footer-brand p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.footer-links {
  display: flex;
  gap: 64px;
}

.footer-col h4 {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--text-primary); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px 24px;
}
.footer-bottom p {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
}
.footer-bottom a {
  color: var(--text-muted);
  transition: color var(--transition);
}
.footer-bottom a:hover { color: var(--text-secondary); }

/* ----------- Interior Pages ----------- */
.page-interior {
  background: var(--bg);
}

.interior-main {
  padding-top: calc(var(--nav-height) + 60px);
  padding-bottom: 100px;
}

.prose-page {
  max-width: 740px;
  margin: 0 auto;
}

.prose-header {
  margin-bottom: 48px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}
.prose-header h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 12px;
}
.prose-meta {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.prose-body {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.8;
}

.prose-body h2 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 48px 0 16px;
  letter-spacing: -0.015em;
}
.prose-body h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 28px 0 10px;
}
.prose-body p {
  margin-bottom: 16px;
}
.prose-body strong { color: var(--text-primary); }
.prose-body ul {
  list-style: none;
  margin: 0 0 20px 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.prose-body ul li {
  padding-left: 20px;
  position: relative;
}
.prose-body ul li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--accent-blue);
  font-weight: 600;
}
.prose-body a {
  color: var(--accent-blue);
  transition: opacity var(--transition);
}
.prose-body a:hover { opacity: 0.8; }

.contact-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  margin-top: 12px;
  font-size: 0.95rem;
  line-height: 2;
}

.prose-footer {
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

/* ----------- Responsive ----------- */
@media (max-width: 960px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .cards-grid {
    grid-template-columns: 1fr;
  }
  .platforms-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .contact-inner {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .contact-links {
    padding-top: 0;
  }
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 40px;
    padding-bottom: 40px;
  }
  .footer-brand {
    max-width: 100%;
  }
}

@media (max-width: 640px) {
  .section {
    padding: 72px 0;
  }
  .nav-links {
    display: none;
    position: fixed;
    inset: 0;
    top: var(--nav-height);
    background: rgba(8, 12, 24, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
  }
  .nav-links.open {
    display: flex;
  }
  .nav-links a {
    font-size: 1.3rem;
    padding: 14px 28px;
  }
  .nav-toggle {
    display: flex;
  }
  .hero-content {
    padding-top: calc(var(--nav-height) + 40px);
    padding-bottom: 60px;
  }
  .hero-cta {
    flex-direction: column;
    align-items: flex-start;
  }
  .hero-cta .btn {
    width: 100%;
    justify-content: center;
  }
  .about-stats {
    grid-template-columns: 1fr 1fr;
  }
  .platforms-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-links {
    flex-direction: column;
    gap: 32px;
  }
}

/* ----------- Animations ----------- */
@media (prefers-reduced-motion: no-preference) {
  .card,
  .stat-card,
  .platform-item,
  .contact-product-link {
    opacity: 0;
    transform: translateY(24px);
    animation: fadeUp 0.6s ease forwards;
  }

  .card:nth-child(1) { animation-delay: 0.05s; }
  .card:nth-child(2) { animation-delay: 0.15s; }
  .card:nth-child(3) { animation-delay: 0.25s; }

  .stat-card:nth-child(1) { animation-delay: 0.05s; }
  .stat-card:nth-child(2) { animation-delay: 0.12s; }
  .stat-card:nth-child(3) { animation-delay: 0.19s; }
  .stat-card:nth-child(4) { animation-delay: 0.26s; }

  .platform-item:nth-child(1) { animation-delay: 0.05s; }
  .platform-item:nth-child(2) { animation-delay: 0.12s; }
  .platform-item:nth-child(3) { animation-delay: 0.19s; }
  .platform-item:nth-child(4) { animation-delay: 0.26s; }
}

@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}