/* ==========================================================================
   futodama — base styles, tokens
   ========================================================================== */

:root {
  --navy: #1F2A37;
  --blue: #3B82C4;
  --warm-white: #FAFAF8;
  --charcoal: #222222;
  --green: #6F9275;
  --gold: #D8B45B;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, Roboto, Helvetica, Arial,
    sans-serif;

  --container-width: 1080px;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 40px;
  --space-5: 64px;
  --space-6: 96px;

  --radius: 10px;
  --transition: 0.2s ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--warm-white);
  color: var(--charcoal);
  line-height: 1.7;
  overflow-x: hidden;
}

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

a {
  color: var(--blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h1,
h2,
h3 {
  color: var(--navy);
  line-height: 1.35;
  margin: 0 0 var(--space-2);
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
}

h2 {
  font-size: clamp(1.5rem, 3.5vw, 2.1rem);
}

h3 {
  font-size: 1.3rem;
}

p {
  margin: 0 0 var(--space-2);
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

.jp {
  color: var(--charcoal);
}

.tagline {
  color: var(--navy);
  font-style: italic;
  opacity: 0.8;
}

/* Focus visibility — never remove */
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 2px;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 14px 28px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  border: 2px solid transparent;
  transition: background var(--transition), color var(--transition),
    border-color var(--transition);
  cursor: pointer;
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background: var(--blue);
  color: #fff;
}

.btn-primary:hover {
  background: var(--navy);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--navy);
  border-color: var(--navy);
}

.btn-outline:hover {
  background: var(--navy);
  color: #fff;
}

.btn-disabled {
  background: transparent;
  color: var(--charcoal);
  border-color: #ccc;
  opacity: 0.7;
  cursor: default;
  pointer-events: none;
}

/* ==========================================================================
   Header / Nav
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--warm-white);
  border-bottom: 1px solid rgba(31, 42, 55, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-2);
  padding-bottom: var(--space-2);
}

.logo {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.01em;
}

.logo:hover {
  text-decoration: none;
  opacity: 0.85;
}

.logo-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--blue);
  flex-shrink: 0;
}

.main-nav {
  display: flex;
  align-items: center;
}

.nav-menu {
  list-style: none;
  display: flex;
  gap: var(--space-4);
  margin: 0;
  padding: 0;
}

.nav-menu a {
  color: var(--navy);
  font-weight: 500;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
}

.lang-switch .lang-current {
  color: var(--navy);
}

.lang-switch a {
  color: var(--blue);
}

.lang-switch .lang-sep {
  color: rgba(31, 42, 55, 0.3);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: 8px;
  cursor: pointer;
}

.hamburger,
.hamburger::before,
.hamburger::after {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--navy);
  transition: transform var(--transition), opacity var(--transition);
}

.hamburger {
  position: relative;
}

.hamburger::before,
.hamburger::after {
  content: "";
  position: absolute;
  left: 0;
}

.hamburger::before {
  top: -7px;
}

.hamburger::after {
  top: 7px;
}

.nav-toggle[aria-expanded="true"] .hamburger {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .hamburger::before {
  transform: rotate(45deg);
  top: 0;
}

.nav-toggle[aria-expanded="true"] .hamburger::after {
  transform: rotate(-45deg);
  top: 0;
}

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
  padding: var(--space-6) 0 var(--space-5);
  text-align: center;
}

.hero .container {
  max-width: 720px;
}

.hero h1 {
  margin-bottom: var(--space-3);
  letter-spacing: -0.01em;
}

.hero-sub {
  font-size: 1.15rem;
  line-height: 1.9;
  color: var(--charcoal);
  margin-bottom: var(--space-4);
}

.hero .btn {
  margin-top: var(--space-2);
}

/* ==========================================================================
   Products
   ========================================================================== */

.products {
  padding: var(--space-5) 0;
}

.products h2 {
  text-align: center;
  margin-bottom: var(--space-4);
}

.product-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

.product-card {
  background: #fff;
  border: 1px solid rgba(31, 42, 55, 0.1);
  border-radius: var(--radius);
  padding: var(--space-4);
}

.product-card h3 {
  display: flex;
  align-items: center;
  gap: 10px;
}

.product-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.product-card--arrvd .product-dot {
  background: var(--blue);
}

.product-card--mojitsunagi .product-dot {
  background: var(--green);
}

.product-card--celestial .product-dot {
  background: var(--gold);
}

.featured-label {
  display: inline-block;
  background: rgba(59, 130, 196, 0.12);
  color: var(--blue);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: var(--space-2);
}

.product-card--featured {
  grid-column: 1 / -1;
  background: var(--warm-white);
  border: 1px solid rgba(59, 130, 196, 0.35);
  padding: var(--space-5) var(--space-4);
}

.product-card--featured h3 {
  font-size: 1.75rem;
}

.product-copy {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--navy);
}

.product-sub {
  color: var(--charcoal);
}

.product-jp {
  color: var(--charcoal);
  margin-bottom: var(--space-3);
}

/* ==========================================================================
   About
   ========================================================================== */

.about {
  padding: var(--space-5) 0;
  background: #fff;
}

.about .container {
  max-width: 720px;
}

.about h2 {
  text-align: center;
}

.about p {
  text-align: center;
}

.about .tagline {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid rgba(31, 42, 55, 0.1);
  font-size: 1.05rem;
}

.about--standalone {
  padding-top: var(--space-6);
}

/* ==========================================================================
   Generic page hero (subpages)
   ========================================================================== */

.page-hero {
  padding: var(--space-5) 0 var(--space-4);
  text-align: center;
}

.page-hero .eyebrow {
  display: inline-block;
  color: var(--blue);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.85rem;
  margin-bottom: var(--space-1);
}

.page-hero--green .eyebrow {
  color: var(--green);
}

.page-hero--gold .eyebrow {
  color: var(--gold);
}

.hero-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 8px;
  vertical-align: middle;
}

.hero-dot--green {
  background: var(--green);
}

.hero-dot--gold {
  background: var(--gold);
}

.status-badge {
  display: inline-block;
  margin-top: var(--space-2);
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(216, 180, 91, 0.18);
  color: var(--navy);
  font-weight: 600;
  font-size: 0.9rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  padding: var(--space-4) 0 var(--space-6);
}

.feature-card {
  background: #fff;
  border: 1px solid rgba(31, 42, 55, 0.1);
  border-radius: var(--radius);
  padding: var(--space-3);
}

.feature-card h3 {
  font-size: 1.1rem;
}

.content-section {
  padding: var(--space-4) 0 var(--space-6);
}

.content-section .container {
  max-width: 720px;
}

.placeholder-note {
  color: var(--charcoal);
  opacity: 0.75;
  font-style: italic;
}

.text-center {
  text-align: center;
}

/* ==========================================================================
   ARRVD page — idea / steps / privacy
   ========================================================================== */

.section-tint {
  background: #fff;
}

.idea-section .container,
.privacy-section .container {
  max-width: 720px;
  text-align: center;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  margin-top: var(--space-3);
}

.step {
  position: relative;
  background: #fff;
  border: 1px solid rgba(31, 42, 55, 0.1);
  border-radius: var(--radius);
  padding: var(--space-3);
  padding-top: 56px;
}

.step-number {
  position: absolute;
  top: 16px;
  left: 16px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
}

.step h3 {
  font-size: 1.05rem;
}

.disclaimer {
  font-size: 0.9rem;
  color: var(--charcoal);
  opacity: 0.75;
}

/* ==========================================================================
   404
   ========================================================================== */

.error-page {
  min-height: 55vh;
  display: flex;
  align-items: center;
  text-align: center;
  padding: var(--space-6) 0;
}

.error-page .container {
  max-width: 560px;
}

.error-code {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--blue);
  margin-bottom: var(--space-1);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  border-top: 1px solid rgba(31, 42, 55, 0.08);
  padding: var(--space-5) 0 var(--space-4);
  background: var(--warm-white);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}

.footer-col h4 {
  color: var(--navy);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin: 0 0 var(--space-2);
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0;
  padding: 0;
}

.footer-col a {
  color: var(--charcoal);
}

.footer-col a:hover {
  color: var(--navy);
}

.footer-bottom {
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid rgba(31, 42, 55, 0.08);
  text-align: center;
}

.copyright {
  margin: 0;
  color: var(--charcoal);
  opacity: 0.7;
  font-size: 0.9rem;
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 900px) {
  .feature-grid,
  .steps {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .product-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-3);
    text-align: center;
  }

  .footer-col ul {
    align-items: center;
  }

  .nav-toggle {
    display: block;
  }

  .main-nav {
    position: relative;
  }

  .nav-menu {
    position: absolute;
    top: calc(100% + 12px);
    right: 0;
    flex-direction: column;
    background: #fff;
    border: 1px solid rgba(31, 42, 55, 0.1);
    border-radius: var(--radius);
    padding: var(--space-2);
    gap: var(--space-2);
    min-width: 180px;
    box-shadow: 0 8px 24px rgba(31, 42, 55, 0.12);
    display: none;
  }

  .nav-menu.is-open {
    display: flex;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: var(--space-5) 0 var(--space-4);
  }

  .product-card--featured {
    padding: var(--space-3);
  }
}

/* Respect reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}