/* ==========================================================================
   flexicarry Redesign — 2024
   Modern Editorial / Bento Grid Layout
   Zero external resources, system font stack
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables — Color Palette & Typography
   -------------------------------------------------------------------------- */
:root {
  /* Neutral base */
  --color-bg: #f7f7f5;
  --color-bg-alt: #eae9e5;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-muted: #5c5c5c;
  --color-border: #d4d4d0;

  /* Accent — teal / slate blue */
  --color-accent: #2a7d6e;
  --color-accent-light: #3da895;
  --color-accent-dark: #1e5c50;

  /* Secondary accent — slate */
  --color-slate: #4a5568;
  --color-slate-light: #718096;

  /* Typography */
  --font-sans: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", "Meiryo", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: "Hiragino Mincho ProN", "Yu Mincho", "MS Mincho", serif;

  /* Spacing scale */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

/* --------------------------------------------------------------------------
   Reset & Base
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  color: var(--color-accent-dark);
}

ul, ol {
  list-style: none;
}

/* --------------------------------------------------------------------------
   Utility Classes
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: var(--space-md);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-md);
  max-width: 1200px;
  margin-inline: auto;
}
.site-header__logo img {
  height: 40px;
  width: auto;
}
.site-header__nav {
  display: flex;
  gap: var(--space-lg);
}
.site-header__nav a {
  font-size: 0.875rem;
  color: var(--color-text);
  font-weight: 500;
}
.site-header__nav a:hover {
  color: var(--color-accent);
}

@media (max-width: 640px) {
  .site-header__nav {
    display: none;
  }
}

/* --------------------------------------------------------------------------
   Hero Section — Editorial Cover Style
   -------------------------------------------------------------------------- */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
  min-height: 80vh;
  padding: var(--space-2xl) var(--space-md);
  max-width: 1200px;
  margin-inline: auto;
}
.hero__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}
.hero__badge {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  width: fit-content;
}
.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-text-muted);
  max-width: 480px;
}
.hero__visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4 / 3;
}
.hero__visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(42, 125, 110, 0.1) 0%, transparent 60%);
  pointer-events: none;
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding: var(--space-xl) var(--space-md);
  }
  .hero__visual {
    order: -1;
  }
}

/* --------------------------------------------------------------------------
   Section Titles
   -------------------------------------------------------------------------- */
.section-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}
.section-header__label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-sm);
}
.section-header__title {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.3;
}

/* --------------------------------------------------------------------------
   Value Section — Bento Grid
   -------------------------------------------------------------------------- */
.value-section {
  background: var(--color-bg-alt);
  padding: var(--space-2xl) var(--space-md);
}
.bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  max-width: 1200px;
  margin-inline: auto;
}
.bento-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}
.bento-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.08);
}
.bento-card--featured {
  grid-column: span 2;
  grid-row: span 2;
  padding: var(--space-xl);
}
.bento-card__icon {
  width: 48px;
  height: 48px;
  background: var(--color-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 1.25rem;
}
.bento-card__title {
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.4;
}
.bento-card__text {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}
.bento-card__image {
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-top: auto;
}
.bento-card__image img {
  width: 100%;
  height: auto;
}

@media (max-width: 900px) {
  .bento-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .bento-card--featured {
    grid-column: span 2;
    grid-row: span 1;
  }
}
@media (max-width: 600px) {
  .bento-grid {
    grid-template-columns: 1fr;
  }
  .bento-card--featured {
    grid-column: span 1;
  }
}

/* --------------------------------------------------------------------------
   Products Section — Card Grid
   -------------------------------------------------------------------------- */
.products-section {
  padding: var(--space-2xl) var(--space-md);
}
.products-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  max-width: 1200px;
  margin-inline: auto;
}
.product-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}
.product-card__image {
  aspect-ratio: 1 / 1;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
}
.product-card__image img {
  max-height: 180px;
  width: auto;
  object-fit: contain;
}
.product-card__body {
  padding: var(--space-md);
}
.product-card__title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}
.product-card__desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

@media (max-width: 1000px) {
  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 600px) {
  .products-grid {
    grid-template-columns: 1fr;
  }
}

/* --------------------------------------------------------------------------
   Flow Section — Timeline
   -------------------------------------------------------------------------- */
.flow-section {
  background: var(--color-bg-alt);
  padding: var(--space-2xl) var(--space-md);
}
.timeline {
  max-width: 800px;
  margin-inline: auto;
  position: relative;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}
.timeline-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
  position: relative;
}
.timeline-item:last-child {
  margin-bottom: 0;
}
.timeline-item__number {
  width: 48px;
  height: 48px;
  background: var(--color-accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  position: relative;
  z-index: 1;
}
.timeline-item__content {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
}
.timeline-item__header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}
.timeline-item__icon {
  width: 64px;
  height: 64px;
  flex-shrink: 0;
}
.timeline-item__icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.timeline-item__title {
  font-size: 1.125rem;
  font-weight: 600;
}
.timeline-item__subtitle {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}
.timeline-item__list {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}
.timeline-item__list li {
  position: relative;
  padding-left: var(--space-md);
  margin-bottom: var(--space-xs);
}
.timeline-item__list li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

@media (max-width: 600px) {
  .timeline::before {
    left: 20px;
  }
  .timeline-item {
    grid-template-columns: 40px 1fr;
    gap: var(--space-md);
  }
  .timeline-item__number {
    width: 40px;
    height: 40px;
    font-size: 0.875rem;
  }
  .timeline-item__icon {
    width: 48px;
    height: 48px;
  }
}

/* --------------------------------------------------------------------------
   About Section
   -------------------------------------------------------------------------- */
.about-section {
  padding: var(--space-2xl) var(--space-md);
}
.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  max-width: 1200px;
  margin-inline: auto;
}
.about-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
}
.about-card__label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}
.about-card__title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
}
.about-card__text {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

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

/* --------------------------------------------------------------------------
   Manifesto Section
   -------------------------------------------------------------------------- */
.manifesto-section {
  background: var(--color-text);
  color: #fff;
  padding: var(--space-2xl) var(--space-md);
  text-align: center;
}
.manifesto__inner {
  max-width: 800px;
  margin-inline: auto;
}
.manifesto__label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent-light);
  margin-bottom: var(--space-md);
}
.manifesto__title {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: var(--space-lg);
}
.manifesto__text {
  font-size: 1rem;
  line-height: 2;
  color: rgba(255,255,255,0.85);
  margin-bottom: var(--space-lg);
}
.manifesto__purpose {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  font-size: 1.125rem;
  font-weight: 600;
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  margin-top: var(--space-md);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-lg) var(--space-md);
  text-align: center;
}
.site-footer__logo {
  margin-bottom: var(--space-md);
}
.site-footer__logo img {
  height: 32px;
  width: auto;
  margin-inline: auto;
}
.site-footer__copy {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Back to Top Button
   -------------------------------------------------------------------------- */
.back-to-top {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  width: 48px;
  height: 48px;
  background: var(--color-accent);
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base), background var(--transition-fast);
  z-index: 50;
}
.back-to-top:hover {
  background: var(--color-accent-dark);
}
.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top__icon {
  width: 20px;
  height: 20px;
  border-left: 2px solid currentColor;
  border-top: 2px solid currentColor;
  transform: rotate(45deg) translateY(4px);
}

@media (max-width: 600px) {
  .back-to-top {
    bottom: var(--space-md);
    right: var(--space-md);
    width: 40px;
    height: 40px;
  }
}