/* =============================================
   Design Tokens
   ============================================= */
:root {
  --primary:        #7C3AED;
  --primary-dark:   #6D28D9;
  --primary-light:  #bfb1ff;
  --primary-bg:     #f0fdfa;
  --text:           #111827;
  --text-muted:     #6b7280;
  --border:         #e5e7eb;
  --surface:        #ffffff;
  --surface-alt:    #f9fafb;
  --shadow-sm:      0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:      0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg:      0 10px 15px rgba(0,0,0,0.07), 0 4px 6px rgba(0,0,0,0.04);
  --shadow-xl:      0 20px 25px rgba(0,0,0,0.08), 0 8px 10px rgba(0,0,0,0.04);
  --shadow-2xl:     0 25px 50px rgba(0,0,0,0.15);
  --ease-out:       cubic-bezier(0.16, 1, 0.3, 1);
  --duration:       300ms;
}

/* =============================================
   Base
   ============================================= */
html { scroll-behavior: smooth; }

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Hiragino Sans", "Hiragino Kaku Gothic ProN",
    "Noto Sans JP", Meiryo, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, video { max-width: 100%; height: auto; display: block; }

/* =============================================
   Scroll margin for sticky header offset
   ============================================= */
#features, #howto, #usecases, #pricing-flow, #faq {
  scroll-margin-top: 72px;
}

/* =============================================
   Accessibility
   ============================================= */
.skip-to-content {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}
.skip-to-content:focus {
  position: fixed;
  top: 0;
  left: 0;
  width: auto;
  height: auto;
  padding: 0.5rem 1rem;
  background: var(--primary);
  color: #fff;
  font-size: 0.875rem;
  font-weight: 600;
  z-index: 9999;
}
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
}

/* =============================================
   Animations
   ============================================= */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(2rem); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes glowPulse {
  0%, 100% { opacity: 0.35; transform: scale(1); }
  50%       { opacity: 0.55; transform: scale(1.04); }
}

.fade-hidden {
  opacity: 0;
  transform: translateY(2rem);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}
.fade-visible { opacity: 1; transform: translateY(0); }

.stagger-1 { transition-delay: 50ms; }
.stagger-2 { transition-delay: 150ms; }
.stagger-3 { transition-delay: 250ms; }
.stagger-4 { transition-delay: 350ms; }
.stagger-5 { transition-delay: 450ms; }

/* =============================================
   Header
   ============================================= */
.site-header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.logo-icon {
  background: var(--primary);
  transition: transform var(--duration) var(--ease-out);
}
.logo-icon:hover { transform: rotate(-6deg) scale(1.05); }

#mobile-menu { display: none; }
#mobile-menu.is-open { display: block; }

.nav-cta-btn:hover {
  box-shadow: 0 0 0 3px var(--primary-light);
}

/* =============================================
   Section titles
   ============================================= */
.section-title {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  line-height: 1.25;
}
.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* =============================================
   Hero
   ============================================= */
.hero-glow {
  position: absolute;
  inset: -1.5rem;
  background: radial-gradient(circle at 60% 50%, #ccfbf1 0%, transparent 70%);
  animation: glowPulse 4s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}

.trust-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 9999px;
  padding: 0.375rem 0.875rem;
  box-shadow: var(--shadow-sm);
}

.btn-hero-primary {
  transition: background var(--duration) var(--ease-out), transform var(--duration) var(--ease-out), box-shadow var(--duration) var(--ease-out);
  position: relative;
  overflow: hidden;
}
.btn-hero-primary::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.15);
  opacity: 0;
  transition: opacity var(--duration) var(--ease-out);
}
.btn-hero-primary:hover::after { opacity: 1; }
.btn-hero-primary:hover { transform: translateY(-1px); box-shadow: var(--shadow-xl); }

/* =============================================
   Video player
   ============================================= */
.video-wrap {
  aspect-ratio: 16 / 9;
  background: #111827;
  border-radius: 1rem;
  box-shadow: var(--shadow-2xl);
  border: 1px solid #374151;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
}

.video-chrome {
  display: flex;
  align-items: center;
  padding: 0.5rem 0.875rem;
  background: #1f2937;
  flex-shrink: 0;
}

.video-body {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #111827;
  overflow: hidden;
}

.video-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

/* =============================================
   Problem cards
   ============================================= */
.problem-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.5rem;
  background: var(--surface);
  border: 2px solid #fee2e2;
  border-radius: 1rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--duration) var(--ease-out),
              transform var(--duration) var(--ease-out),
              border-color var(--duration) var(--ease-out);
}
.problem-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  border-color: #fca5a5;
}

.problem-icon {
  width: 48px;
  height: 48px;
  min-width: 48px;
  border-radius: 12px;
  background: #fef2f2;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* =============================================
   Feature cards
   ============================================= */
.feature-card {
  transition: box-shadow var(--duration) var(--ease-out),
              transform var(--duration) var(--ease-out),
              border-color var(--duration) var(--ease-out);
}
.feature-card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-8px);
  border-color: var(--primary-light) !important;
}

/* =============================================
   Steps (How to use)
   ============================================= */
.step-line {
  position: absolute;
  left: 27px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
  z-index: 0;
}

.step {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  position: relative;
  z-index: 1;
}

.step-number {
  width: 56px;
  height: 56px;
  min-width: 56px;
  border-radius: 9999px;
  background: var(--primary);
  color: #fff;
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  transition: transform var(--duration) var(--ease-out);
}
.step-number:hover { transform: scale(1.12); }

.step-card {
  flex: 1 1 auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--duration) var(--ease-out);
}
.step-card:hover { box-shadow: var(--shadow-lg); }

/* =============================================
   Use case cards
   ============================================= */
.usecase-card {
  transition: box-shadow var(--duration) var(--ease-out),
              transform var(--duration) var(--ease-out);
}
.usecase-card:hover {
  box-shadow: var(--shadow-xl);
  transform: scale(1.05);
}

.usecase-icon { transition: background var(--duration) var(--ease-out), color var(--duration) var(--ease-out); }

.usecase-blue  { background: #dbeafe; color: #2563eb; }
.usecase-green { background: #dcfce7; color: #16a34a; }
.usecase-purple{ background: #ede9fe; color: #7c3aed; }
.usecase-pink  { background: #fce7f3; color: #db2777; }
.usecase-orange{ background: #ffedd5; color: #ea580c; }
.usecase-cyan  { background: #cffafe; color: #0891b2; }
.usecase-yellow{ background: #fef9c3; color: #ca8a04; }
.usecase-teal  { background: #ccfbf1; color: #0d9488; }

.usecase-card:hover .usecase-blue  { background: #2563eb; }
.usecase-card:hover .usecase-green { background: #16a34a; }
.usecase-card:hover .usecase-purple{ background: #7c3aed; }
.usecase-card:hover .usecase-pink  { background: #db2777; }
.usecase-card:hover .usecase-orange{ background: #ea580c; }
.usecase-card:hover .usecase-cyan  { background: #0891b2; }
.usecase-card:hover .usecase-yellow{ background: #ca8a04; }
.usecase-card:hover .usecase-teal  { background: #0d9488; }

.usecase-card:hover .usecase-icon { color: #fff; }

/* =============================================
   Pricing card
   ============================================= */
.pricing-card {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
}

.pricing-glow {
  position: absolute;
  top: 0;
  right: 0;
  width: 10rem;
  height: 10rem;
  border-radius: 9999px;
  background: rgba(255,255,255,0.08);
  filter: blur(3rem);
  transform: translate(2rem, -2rem);
}

.pricing-btn:hover {
  background: var(--primary-bg);
  color: var(--primary-dark);
}

/* =============================================
   Flow (onboarding steps in pricing section)
   ============================================= */
.flow-line {
  position: absolute;
  left: 23px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
  z-index: 0;
}

.flow-step {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  position: relative;
  z-index: 1;
}

.flow-number {
  width: 48px;
  height: 48px;
  min-width: 48px;
  border-radius: 9999px;
  color: #fff;
  font-size: 1.125rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
}
.flow-number-primary { background: var(--primary); }
.flow-number-blue    { background: var(--primary); }

.flow-card {
  flex: 1 1 auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1rem 1.25rem;
  box-shadow: var(--shadow-sm);
}

/* =============================================
   FAQ
   ============================================= */
.faq-item {
  background: linear-gradient(135deg, #f9fafb, #ffffff);
  border: 1px solid var(--border);
  transition: box-shadow var(--duration) var(--ease-out),
              transform var(--duration) var(--ease-out);
}
.faq-item:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.faq-q {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: baseline;
}

.faq-a {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.75;
  padding-left: 1.5rem;
}

/* =============================================
   CTA section
   ============================================= */
.cta-section {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
}

.cta-circle {
  position: absolute;
  border-radius: 9999px;
  background: rgba(255,255,255,0.05);
  filter: blur(3rem);
  pointer-events: none;
}
.cta-circle-tl { width: 16rem; height: 16rem; top: -4rem;  left: -4rem; }
.cta-circle-br { width: 24rem; height: 24rem; bottom: -6rem; right: -6rem; }

.btn-cta-primary {
  color: var(--primary);
  transition: background var(--duration) var(--ease-out),
              transform var(--duration) var(--ease-out),
              box-shadow var(--duration) var(--ease-out);
}
.btn-cta-primary:hover {
  background: var(--primary-bg);
  transform: scale(1.05);
  box-shadow: var(--shadow-xl);
}

.btn-cta-outline {
  transition: background var(--duration) var(--ease-out),
              color var(--duration) var(--ease-out),
              transform var(--duration) var(--ease-out);
}
.btn-cta-outline:hover {
  background: #fff;
  color: var(--primary);
  transform: scale(1.05);
}

/* =============================================
   Footer
   ============================================= */
.footer-link {
  font-size: 0.875rem;
  color: #d1d5db;
  transition: color var(--duration) var(--ease-out);
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
}
.footer-link:hover { color: #fff; }

/* =============================================
   Modals
   ============================================= */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background: rgba(0, 0, 0, 0.5);
}
.modal-overlay.hidden { display: none; }

.modal-box {
  background: #fff;
  border-radius: 1rem;
  box-shadow: var(--shadow-2xl);
  max-width: 42rem;
  width: 100%;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
}

/* =============================================
   Utility: primary colour helpers
   ============================================= */
.bg-primary       { background-color: var(--primary); }
.bg-primary-dark  { background-color: var(--primary-dark); }
.bg-primary-light { background-color: var(--primary-light); }
.bg-primary-bg    { background-color: var(--primary-bg); }
.text-primary     { color: var(--primary); }
.text-primary-dark{ color: var(--primary-dark); }
.border-primary   { border-color: var(--primary); }
.hover\:bg-primary-dark:hover  { background-color: var(--primary-dark); }
.hover\:bg-primary-light:hover { background-color: var(--primary-light); }

/* =============================================
   Reduced motion
   ============================================= */
@media (prefers-reduced-motion: reduce) {
  .fade-hidden {
    opacity: 1;
    transform: none;
    transition-duration: 0.01ms;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* =============================================
   Print
   ============================================= */
@media print {
  .site-header, #mobile-menu, .video-wrap, .btn-hero-primary,
  .btn-cta-primary, .btn-cta-outline { display: none !important; }
  body { color: #000; background: #fff; }
  a::after { content: " (" attr(href) ")"; font-size: 0.75rem; color: #555; }
}