:root {
  --primary: #1E3A5F;
  --accent: #00D4FF;
  --secondary: #7B61FF;
  --bg-dark: #0B1929;
  --bg-card: #122240;
  --transition: 0.3s;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', 'Noto Sans JP', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Header */
header {
  transition: background-color var(--transition), box-shadow var(--transition);
}

.header-scrolled {
  background-color: rgba(11, 25, 41, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.05);
}

/* Hero glow */
.hero-glow {
  position: absolute;
  top: -120px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(0, 212, 255, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.gradient-text {
  background: linear-gradient(135deg, var(--accent), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Preview container */
.preview-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: linear-gradient(135deg, #1a2d4a, #0f1f36);
}

.preview-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 1280px;
  height: 800px;
  transform-origin: 0 0;
  border: none;
  pointer-events: none;
}

/* Overlay */
.preview-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}

.work-card:hover .preview-overlay,
.work-card:focus-within .preview-overlay {
  background: rgba(0, 0, 0, 0.5);
}

@media (hover: none) {
  .preview-overlay {
    background: rgba(0, 0, 0, 0.4);
  }
  .overlay-btn {
    opacity: 1;
    transform: translateY(0);
  }
}

.overlay-btn {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--transition), transform var(--transition);
  background: var(--accent);
  color: #0B1929;
  padding: 0.6rem 1.8rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
}

.overlay-btn:hover {
  background: #33dfff;
}

.work-card:hover .overlay-btn,
.work-card:focus-within .overlay-btn {
  opacity: 1;
  transform: translateY(0);
}

/* Card */
.work-card {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.06);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.work-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 48px rgba(0, 212, 255, 0.08);
  border-color: rgba(0, 212, 255, 0.2);
}

/* Badge */
.badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15rem 0.6rem;
  border-radius: 9999px;
  letter-spacing: 0.02em;
}

.badge-green {
  background: rgba(52, 211, 153, 0.15);
  color: #34d399;
}

.badge-blue {
  background: rgba(0, 212, 255, 0.15);
  color: var(--accent);
}

.badge-purple {
  background: rgba(123, 97, 255, 0.15);
  color: var(--secondary);
}

.badge-red {
  background: rgba(230, 57, 70, 0.15);
  color: #E63946;
}

.badge-lavender {
  background: rgba(184, 169, 201, 0.15);
  color: #B8A9C9;
}

/* Strength card */
.strength-card {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.06);
  transition: border-color var(--transition);
}

.strength-card:hover {
  border-color: rgba(0, 212, 255, 0.2);
}

/* CTA card */
.cta-card {
  background: linear-gradient(135deg, var(--bg-card), rgba(123, 97, 255, 0.08));
  border: 1px solid rgba(255, 255, 255, 0.08);
}

/* Fade-in */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* Mobile menu */
.mobile-menu {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.mobile-menu.open {
  max-height: 200px;
}

.menu-bar {
  transition: transform 0.3s, opacity 0.3s;
}

.menu-open .menu-bar:nth-child(1) {
  transform: translateY(4px) rotate(45deg);
}

.menu-open .menu-bar:nth-child(2) {
  opacity: 0;
}

.menu-open .menu-bar:nth-child(3) {
  transform: translateY(-4px) rotate(-45deg);
}

/* Focus */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}