/* ============================================
   Layout & Structure
   ============================================ */

/* --- Container --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.container--narrow {
  max-width: var(--max-width-narrow);
}

.container--wide {
  max-width: var(--max-width-wide);
}

/* --- Section --- */
.section {
  padding: var(--space-5xl) 0;
}

.section--soft {
  background-color: var(--color-bg-soft);
}

.section__label {
  display: block;
  font-family: var(--font-accent);
  font-size: var(--fs-xs);
  font-weight: var(--fw-bold);
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
}

.section__title {
  font-size: var(--fs-3xl);
  font-weight: var(--fw-black);
  color: var(--color-text);
  margin-bottom: var(--space-xl);
}

.section__header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

/* --- Grid --- */
.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* --- Flex --- */
.flex {
  display: flex;
}

.flex--center {
  align-items: center;
  justify-content: center;
}

.flex--between {
  align-items: center;
  justify-content: space-between;
}

.flex--gap-sm { gap: var(--space-sm); }
.flex--gap-md { gap: var(--space-md); }
.flex--gap-lg { gap: var(--space-lg); }
.flex--wrap { flex-wrap: wrap; }

/* --- Rainbow Divider --- */
.rainbow-line {
  width: 100%;
  height: 4px;
  background: var(--gradient-rainbow);
}

/* ============================================
   Header
   ============================================ */
.header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-normal), background var(--transition-normal);
  height: var(--header-height);
}

.header.is-scrolled {
  border-bottom-color: var(--color-border);
  background: rgba(255, 255, 255, 0.97);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.header__logo img {
  height: 48px;
  width: auto;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.header__nav-link {
  font-size: var(--fs-base);
  font-weight: var(--fw-medium);
  color: var(--color-text);
  transition: color var(--transition-fast);
  position: relative;
}

.header__nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-normal);
}

.header__nav-link:hover {
  color: var(--color-primary);
}

.header__nav-link:hover::after {
  width: 100%;
}

.header__hamburger {
  display: none;
  width: 28px;
  height: 28px;
  padding: 0;
}

/* ============================================
   Mobile Menu
   ============================================ */
.mobile-menu {
  position: fixed;
  top: 0;
  right: 0;
  width: 75%;
  max-width: 320px;
  height: 100vh;
  background: var(--color-bg-card);
  z-index: var(--z-mobile-menu);
  padding: 80px var(--space-xl) var(--space-xl);
  box-shadow: -8px 0 30px rgba(0, 0, 0, 0.1);
  transform: translateX(100%);
  transition: transform var(--transition-normal);
}

.mobile-menu.is-open {
  transform: translateX(0);
}

.mobile-menu__overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: calc(var(--z-mobile-menu) - 1);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.mobile-menu__overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.mobile-menu__close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  font-size: 28px;
  color: var(--color-text);
}

.mobile-menu__link {
  display: block;
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--fs-md);
  font-weight: var(--fw-medium);
  color: var(--color-text);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--color-text);
  color: var(--color-text-white);
  padding: var(--space-4xl) 0 var(--space-xl);
}

.footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-3xl);
  margin-bottom: var(--space-3xl);
}

.footer__brand-name {
  font-size: var(--fs-lg);
  font-weight: var(--fw-bold);
  margin-bottom: var(--space-md);
}

.footer__brand-desc {
  font-size: var(--fs-sm);
  color: var(--color-text-light);
  line-height: var(--lh-relaxed);
}

.footer__heading {
  font-size: var(--fs-sm);
  font-weight: var(--fw-bold);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: var(--space-lg);
  color: var(--color-text-light);
}

.footer__link {
  display: block;
  font-size: var(--fs-base);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--space-xs) 0;
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-text-white);
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer__copyright {
  font-size: var(--fs-xs);
  color: var(--color-text-light);
}

.footer__social {
  display: flex;
  gap: var(--space-md);
}

.footer__social-link {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast);
}

.footer__social-link:hover {
  background: var(--color-primary);
}

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

/* Tablet */
@media (max-width: 1024px) {
  .section {
    padding: var(--space-4xl) 0;
  }

  .section__title {
    font-size: var(--fs-2xl);
  }

  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }
}

/* Mobile */
@media (max-width: 768px) {
  :root {
    --header-height: var(--header-height-sp);
  }

  .container {
    padding: 0 var(--space-md);
  }

  .section {
    padding: var(--space-3xl) 0;
  }

  .section__title {
    font-size: var(--fs-xl);
  }

  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }

  .header__logo img {
    height: 36px;
  }

  .header__nav {
    display: none;
  }

  .header__hamburger {
    display: block;
  }

  .footer__inner {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .footer__bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* Small mobile */
@media (max-width: 480px) {
  .grid--2 {
    grid-template-columns: 1fr;
  }
}