/* ==========================================================
   FOOD LOSS PORTAL JAPAN — Main Stylesheet
   Theme: Charcoal Dark + Orange Accent + Times New Roman
   ========================================================== */

/* ---------- Custom Properties ---------- */
:root {
  /* Charcoal palette */
  --c-charcoal:       #3A3A3A;   /* primary charcoal */
  --c-charcoal-dark:  #2C2C2C;   /* deeper charcoal */
  --c-charcoal-mid:   #505050;   /* mid charcoal */
  --c-charcoal-light: #6A6A6A;   /* light charcoal */
  --c-accent:         #C8793C;   /* orange-amber */
  --c-accent-light:   #DF9B5A;

  /* Backgrounds */
  --c-bg:             #3A3A3A;   /* page background = charcoal */
  --c-bg-alt:         #333333;   /* slightly darker alternate */
  --c-surface:        #FFFFFF;   /* white card surfaces */
  --c-surface-warm:   #F8F6F2;   /* warm off-white */

  /* Text */
  --c-text:           #1A1A1A;   /* black text (on light surfaces) */
  --c-text-sub:       #3A3A3A;   /* dark gray */
  --c-text-muted:     #6A6A6A;   /* muted gray */
  --c-text-light:     #FFFFFF;   /* white text (on dark surfaces) */
  --c-text-light-sub: rgba(255,255,255,0.75);

  /* Borders */
  --c-border-dark:    #555555;   /* on charcoal bg */
  --c-border:         #E0DDD7;   /* on white cards */

  /* Fonts */
  --font-serif: 'Times New Roman', Times, Georgia, serif;
  --font-jp:    'Noto Sans JP', 'Hiragino Kaku Gothic Pro', 'Yu Gothic Medium', sans-serif;
  --font-en:    'Inter', 'Helvetica Neue', Arial, sans-serif;

  /* Spacing */
  --sp-xs:  0.375rem;
  --sp-sm:  0.75rem;
  --sp-md:  1.25rem;
  --sp-lg:  2rem;
  --sp-xl:  3.5rem;
  --sp-2xl: 6rem;

  /* Layout */
  --nav-h:     64px;
  --max-w:     1160px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Shadows */
  --sh-sm: 0 1px 4px rgba(0,0,0,0.18);
  --sh-md: 0 4px 16px rgba(0,0,0,0.22);
  --sh-lg: 0 8px 32px rgba(0,0,0,0.28);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-jp);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--c-text-light);
  background: var(--c-bg);
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; background: none; border: none; font: inherit; }

/* ---------- Utility ---------- */
.container {
  width: min(var(--max-w), 100% - 2rem);
  margin-inline: auto;
}

/* ==========================================================
   HEADER / NAVIGATION  — Charcoal, Times New Roman
   ========================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: var(--c-charcoal-dark);
  border-bottom: 2px solid var(--c-accent);
  box-shadow: 0 2px 12px rgba(0,0,0,0.4);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  width: min(var(--max-w), 100% - 2rem);
  margin-inline: auto;
  gap: var(--sp-md);
}

.nav-brand {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  flex-shrink: 0;
}
.brand-ja {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: 0.02em;
}
.brand-en {
  font-family: var(--font-serif);
  font-size: 0.64rem;
  font-weight: 400;
  color: rgba(255,255,255,0.5);
  letter-spacing: 0.05em;
}

.nav-main ul { display: flex; align-items: center; }
.nav-main a {
  display: block;
  padding: 0.35rem 0.72rem;
  font-family: var(--font-serif);
  font-size: 0.85rem;
  font-weight: 400;
  color: rgba(255,255,255,0.8);
  border-radius: var(--radius-sm);
  transition: color 0.2s, background 0.2s;
  white-space: nowrap;
  letter-spacing: 0.01em;
}
.nav-main a:hover {
  color: #FFFFFF;
  background: rgba(255,255,255,0.1);
}
.nav-main a.active {
  color: #FFFFFF;
  font-weight: 700;
  border-bottom: 2px solid var(--c-accent);
  border-radius: 0;
  padding-bottom: calc(0.35rem - 2px);
  background: rgba(255,255,255,0.07);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
  flex-shrink: 0;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: rgba(255,255,255,0.8);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==========================================================
   HERO  — Charcoal background, white text
   ========================================================== */
.hero {
  position: relative;
  min-height: 82vh;
  display: flex;
  align-items: center;
  background: var(--c-charcoal-dark);
  overflow: hidden;
}

.hero-bg-accent {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(200,121,60,0.12) 0%, transparent 55%),
    repeating-linear-gradient(
      -45deg,
      transparent, transparent 48px,
      rgba(255,255,255,0.018) 48px, rgba(255,255,255,0.018) 49px
    );
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(to bottom, var(--c-accent), transparent);
  opacity: 0.7;
}

.hero-content {
  position: relative;
  z-index: 1;
  padding-block: var(--sp-2xl);
}

.hero-tagline {
  margin-bottom: var(--sp-lg);
  border-left: 5px solid var(--c-accent);
  padding-left: var(--sp-lg);
}

.tagline-ja {
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 5.5vw, 3.8rem);
  font-weight: 700;
  color: #FFFFFF;
  line-height: 1.25;
  letter-spacing: 0.01em;
}

.tagline-divider { display: none; }

.tagline-en {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 2.5vw, 1.6rem);
  font-weight: 400;
  font-style: italic;
  color: rgba(255,255,255,0.55);
  line-height: 1.35;
  margin-top: 0.5rem;
}

.hero-sub {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
  line-height: 1.85;
  margin-bottom: var(--sp-xl);
  max-width: 520px;
  padding-left: calc(var(--sp-lg) + 5px);
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-sm);
  padding-left: calc(var(--sp-lg) + 5px);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.7rem 1.6rem;
  font-family: var(--font-serif);
  font-size: 0.9rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  letter-spacing: 0.02em;
  transition: all 0.2s;
}
.btn-primary {
  background: var(--c-accent);
  color: #fff;
  border: 1.5px solid var(--c-accent);
}
.btn-primary:hover {
  background: var(--c-accent-light);
  border-color: var(--c-accent-light);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(200,121,60,0.4);
}
.btn-ghost {
  background: transparent;
  color: rgba(255,255,255,0.8);
  border: 1.5px solid rgba(255,255,255,0.35);
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.7);
  color: #fff;
}

/* ==========================================================
   SHARED SECTION LAYOUT
   Sections = white cards floating on charcoal background
   ========================================================== */
.section {
  padding-block: var(--sp-2xl);
}

/* White card wrapper inside each section */
.section > .container,
.metrics-section > .container,
.contents-section > .container,
.updates-section > .container {
  background: var(--c-surface);
  border-radius: var(--radius-lg);
  padding: var(--sp-xl);
  box-shadow: var(--sh-md);
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-sm);
  margin-bottom: var(--sp-xl);
  padding-bottom: var(--sp-md);
  border-bottom: 2px solid var(--c-charcoal-dark);
}
.section-header h2 {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem;
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-text);
}
.en-label {
  font-family: var(--font-serif);
  font-size: 0.82rem;
  font-weight: 400;
  font-style: italic;
  color: var(--c-text-muted);
}
.section-note { font-size: 0.78rem; color: var(--c-text-muted); }
.view-all {
  font-family: var(--font-serif);
  font-size: 0.82rem;
  color: var(--c-charcoal-mid);
  font-weight: 700;
  transition: color 0.2s;
  flex-shrink: 0;
}
.view-all:hover { color: var(--c-accent); }

/* ==========================================================
   METRICS
   ========================================================== */
.metrics-section { background: var(--c-bg); }

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--sp-md);
}

.metric-card {
  padding: var(--sp-lg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  background: var(--c-surface-warm);
  border-left: 4px solid var(--c-charcoal-light);
  transition: box-shadow 0.2s, transform 0.2s;
  color: var(--c-text);
}
.metric-card:hover {
  box-shadow: var(--sh-md);
  transform: translateY(-2px);
}
.metric-card.accent-card {
  border-left-color: var(--c-accent);
  background: #fdf8f4;
}
.metric-number {
  font-family: var(--font-serif);
  font-size: 2.6rem;
  font-weight: 700;
  color: var(--c-text);
  line-height: 1;
  margin-bottom: 0.4rem;
}
.metric-unit {
  font-size: 1rem;
  font-weight: 400;
  font-family: var(--font-jp);
  margin-left: 0.15em;
  color: var(--c-text-sub);
}
.metric-desc p { font-size: 0.85rem; color: var(--c-text-sub); line-height: 1.45; }
.metric-desc p.en { font-size: 0.78rem; color: var(--c-text-muted); margin-top: 0.15rem; }
.metric-delta { margin-top: var(--sp-sm); font-size: 0.75rem; color: var(--c-text-muted); }
.delta-down { color: #2D7A40; font-weight: 600; }

/* ==========================================================
   CONTENTS GRID
   ========================================================== */
.contents-section { background: var(--c-bg); }

.contents-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--sp-sm);
}

.content-card {
  display: grid;
  grid-template-columns: 2.5rem 1fr auto;
  align-items: center;
  gap: var(--sp-md);
  padding: var(--sp-md) var(--sp-lg);
  background: var(--c-surface-warm);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  color: var(--c-text);
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
  cursor: pointer;
}
.content-card:hover {
  border-color: var(--c-accent);
  box-shadow: var(--sh-md);
  transform: translateY(-2px);
}
.content-card:hover .card-arrow { color: var(--c-accent); transform: translateX(4px); }

.card-marker {
  font-family: var(--font-serif);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--c-text-muted);
}
.card-body h3 {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 0.3rem;
}
.card-en { font-family: var(--font-serif); font-size: 0.75rem; font-weight: 400; color: var(--c-text-muted); font-style: italic; }
.card-body p { font-size: 0.8rem; color: var(--c-text-sub); line-height: 1.55; }
.card-arrow { font-family: var(--font-serif); font-size: 1.1rem; color: var(--c-text-muted); transition: color 0.2s, transform 0.2s; flex-shrink: 0; }

.content-card--about { grid-column: 1 / -1; }
@media (min-width: 920px) { .content-card--about { grid-column: auto; } }

/* ==========================================================
   UPDATES
   ========================================================== */
.updates-section { background: var(--c-bg); }

.updates-list { display: flex; flex-direction: column; }

.update-item {
  display: grid;
  grid-template-columns: 5.5rem 5rem 1fr;
  align-items: center;
  gap: var(--sp-md);
  padding: var(--sp-md) 0;
  border-bottom: 1px solid var(--c-border);
  color: var(--c-text);
}
.update-item:first-child { border-top: 1px solid var(--c-border); }

.update-date { font-family: var(--font-serif); font-size: 0.8rem; color: var(--c-text-muted); white-space: nowrap; }
.update-tag {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  font-family: var(--font-serif);
  font-size: 0.7rem;
  font-weight: 700;
  border-radius: 2px;
  text-align: center;
  white-space: nowrap;
}
.tag-data     { background: #E3EFF7; color: #1A5276; }
.tag-policy   { background: #E8F5E9; color: #1B5E20; }
.tag-research { background: #F3E5F5; color: #4A148C; }
.tag-practice { background: #FFF3E0; color: #BF360C; }
.update-text { font-size: 0.875rem; color: var(--c-text); line-height: 1.6; }

/* ==========================================================
   FOOTER  — Darker charcoal
   ========================================================== */
.site-footer {
  background: var(--c-charcoal-dark);
  color: rgba(255,255,255,0.65);
  border-top: 2px solid var(--c-accent);
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--sp-xl);
  padding-block: var(--sp-xl);
  align-items: start;
}
.footer-title { font-family: var(--font-serif); font-size: 1.05rem; font-weight: 700; color: #fff; }
.footer-subtitle { font-family: var(--font-serif); font-size: 0.7rem; letter-spacing: 0.05em; color: rgba(255,255,255,0.4); margin-top: 0.15rem; }
.footer-tagline { margin-top: var(--sp-md); font-family: var(--font-serif); font-size: 0.82rem; font-style: italic; color: rgba(255,255,255,0.3); }
.footer-nav { display: flex; gap: var(--sp-xl); }
.footer-nav-col h4 {
  font-family: var(--font-serif);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: var(--sp-sm);
}
.footer-nav-col li + li { margin-top: 0.4rem; }
.footer-nav-col a { font-family: var(--font-serif); font-size: 0.82rem; color: rgba(255,255,255,0.6); transition: color 0.2s; }
.footer-nav-col a:hover { color: var(--c-accent-light); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-block: var(--sp-md); }
.footer-bottom p { font-family: var(--font-serif); font-size: 0.75rem; color: rgba(255,255,255,0.28); }

/* ==========================================================
   RESPONSIVE
   ========================================================== */
@media (max-width: 860px) {
  .nav-toggle { display: flex; }
  .nav-main {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--c-charcoal-dark);
    border-top: 1px solid rgba(255,255,255,0.08);
    padding: var(--sp-sm) 0;
    box-shadow: var(--sh-lg);
  }
  .nav-main.open { display: block; }
  .nav-main ul { flex-direction: column; }
  .nav-main a { padding: 0.75rem 1.5rem; font-size: 0.9rem; border-radius: 0; }
  .nav-main a.active { border-bottom: none; border-left: 3px solid var(--c-accent); padding-left: calc(1.5rem - 3px); }

  .section > .container,
  .metrics-section > .container,
  .contents-section > .container,
  .updates-section > .container {
    border-radius: var(--radius-md);
    padding: var(--sp-lg);
  }
}

@media (max-width: 700px) {
  .hero { min-height: 75vh; }
  .tagline-ja { font-size: 1.9rem; }
  .tagline-en { font-size: 1rem; }
  .hero-tagline { padding-left: var(--sp-md); border-left-width: 4px; }
  .hero-sub, .hero-cta { padding-left: calc(var(--sp-md) + 4px); }

  .update-item { grid-template-columns: 4.5rem 1fr; grid-template-rows: auto auto; }
  .update-tag { grid-row: 2; grid-column: 2; justify-self: start; }
  .update-text { grid-column: 1 / -1; }

  .footer-inner { grid-template-columns: 1fr; gap: var(--sp-lg); }
  .footer-nav { flex-wrap: wrap; gap: var(--sp-lg); }
}

@media (max-width: 480px) {
  .content-card { grid-template-columns: 2rem 1fr auto; padding: var(--sp-md); gap: var(--sp-sm); }
  .metrics-grid { grid-template-columns: 1fr 1fr; }
  .metric-number { font-size: 1.9rem; }
}