:root {
  --bg: #0a0014;
  --fg: #ffffff;
  --fg-muted: #b0b0bc;
  --tile: #14102a;
  --border: rgba(255, 255, 255, 0.08);

  --grad-0: #ff45aa;
  --grad-1: #ff7848;
  --grad-2: #f5bc5a;
  --grad-3: #36d6c5;
  --grad-4: #29eaff;
  --grad-5: #c636ff;
  --grad: linear-gradient(135deg, var(--grad-0) 0%, var(--grad-1) 20%, var(--grad-2) 40%, var(--grad-3) 60%, var(--grad-4) 80%, var(--grad-5) 100%);

  --radius: 10px;
  --radius-sm: 6px;
  --pad-section: clamp(2rem, 6vw, 4rem);
  --pad-page: clamp(1rem, 4vw, 2rem);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Hiragino Sans', 'Yu Gothic', sans-serif;
  font-size: clamp(0.95rem, 0.4vw + 0.85rem, 1.05rem);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: 0 var(--pad-page);
}

a {
  color: var(--fg);
  text-decoration: underline;
  text-decoration-color: rgba(255, 255, 255, 0.3);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.2s;
}

a:hover {
  text-decoration-color: var(--grad-3);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--bg);
  color: var(--fg);
  padding: 8px 16px;
  z-index: 100;
}

.skip-link:focus {
  left: 0;
}

/* Nav */
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem var(--pad-page);
  max-width: 720px;
  margin: 0 auto;
  width: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--fg);
}

.logo-text {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.nav-links {
  display: flex;
  gap: clamp(1rem, 3vw, 1.6rem);
}

.nav-links a {
  color: var(--fg-muted);
  text-decoration: none;
  font-size: 0.95rem;
  min-height: 44px;
  display: flex;
  align-items: center;
}

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

/* Hero */
.hero {
  padding: var(--pad-section) 0 calc(var(--pad-section) * 0.7);
}

.hero-title {
  font-size: clamp(2rem, 5vw + 1rem, 3.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 1.2rem;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  font-size: clamp(1rem, 0.5vw + 0.95rem, 1.15rem);
  color: var(--fg);
  margin: 0 0 0.6rem;
  max-width: 36em;
}

.hero-sub-ja {
  color: var(--fg-muted);
  margin: 0 0 2rem;
  max-width: 36em;
}

.cta {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 1.2rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: var(--bg) padding-box, var(--grad) border-box;
  border: 1px solid transparent;
  color: var(--fg);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.98rem;
  transition: transform 0.15s, background 0.2s;
}

.cta:hover {
  transform: translateY(-1px);
}

/* Divider */
.divider {
  border: 0;
  height: 1px;
  background: var(--grad);
  opacity: 0.45;
  margin: 0;
}

/* Sections */
.section {
  padding: var(--pad-section) 0;
}

.section-title {
  font-size: clamp(1.5rem, 3vw + 0.8rem, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 1.5rem;
}

/* Products */
.product {
  background: var(--tile);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 0 0 1rem;
}

.product-header {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin: 0 0 0.4rem;
}

.product-name {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 0;
}

.badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
}

.badge-soon {
  background: rgba(54, 214, 197, 0.15);
  color: var(--grad-3);
  border: 1px solid rgba(54, 214, 197, 0.4);
}

.badge-dev {
  background: rgba(255, 120, 72, 0.15);
  color: var(--grad-1);
  border: 1px solid rgba(255, 120, 72, 0.4);
}

.product-tagline {
  color: var(--fg-muted);
  margin: 0 0 0.8rem;
  font-size: 0.92rem;
}

.product-desc {
  margin: 0 0 0.5rem;
}

.product-desc-ja {
  color: var(--fg-muted);
  margin: 0 0 1rem;
}

.product-meta {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  font-size: 0.85rem;
  color: var(--fg-muted);
}

.product-meta li {
  padding: 0.15rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

/* About */
.about-text {
  margin: 0 0 0.6rem;
  max-width: 38em;
}

.about-text-ja {
  color: var(--fg-muted);
  margin: 0 0 1.2rem;
  max-width: 38em;
}

.about-tenet {
  display: inline-block;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--fg-muted);
  margin: 0;
}

/* Contact */
.contact-line {
  margin: 0 0 0.6rem;
}

.contact-line-ja {
  color: var(--fg-muted);
  margin: 0;
}

.contact-mail {
  font-weight: 500;
  word-break: break-all;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 1.6rem var(--pad-page);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--fg-muted);
}

.footer-copy {
  margin: 0;
}

.footer-links {
  display: flex;
  gap: 0.6rem;
  align-items: center;
}

.footer-links a {
  color: var(--fg-muted);
  text-decoration: none;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

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

.footer-tenet {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  opacity: 0.7;
}

/* Responsive: narrow */
@media (max-width: 768px) {
  .nav-links {
    gap: 0.9rem;
  }
  .product {
    padding: 1.2rem;
  }
}

/* Privacy page (shared by /privacy and /privacy/en) */
.privacy-page {
  padding: var(--pad-section) 0;
}

.privacy-toggle {
  display: flex;
  gap: 0.5rem;
  margin: 0 0 1.5rem;
  font-size: 0.9rem;
}

.privacy-toggle a {
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--fg-muted);
}

.privacy-toggle a.active {
  color: var(--fg);
  border-color: var(--grad-3);
}

.privacy-page h1 {
  font-size: clamp(1.6rem, 3vw + 0.9rem, 2.4rem);
  margin: 0 0 0.4rem;
}

.privacy-page h2 {
  font-size: clamp(1.2rem, 1.5vw + 0.9rem, 1.5rem);
  margin: 2rem 0 0.6rem;
}

.privacy-page h3 {
  font-size: 1.05rem;
  margin: 1.4rem 0 0.4rem;
}

.privacy-page p,
.privacy-page li {
  color: var(--fg);
  line-height: 1.65;
}

.privacy-page ul {
  padding-left: 1.4rem;
}

.privacy-page .meta {
  color: var(--fg-muted);
  font-size: 0.9rem;
  margin: 0 0 1.5rem;
}