/* ============================
   CSS Custom Properties
   ============================ */
:root {
  --color-primary: #2E7D32;
  --color-primary-light: #388E3C;
  --color-primary-dark: #1B5E20;
  --color-primary-bg: #F0F7F0;
  --color-accent: #29B6D0;
  --color-accent-dark: #1A96AF;
  --color-accent-bg: #E3F7FB;
  --color-white: #FFFFFF;
  --color-off-white: #F8F8F5;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-border: #E0E0E0;
  --font-serif: 'Noto Sans JP', sans-serif;
  --font-sans: 'Noto Sans JP', sans-serif;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2.5rem;
  --spacing-xl: 4rem;
  --spacing-2xl: 6rem;
  --radius-sm: 4px;
  --radius-md: 8px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.1);
  --transition: 0.3s ease;
  --max-width: 1100px;
  --header-height: 70px;
}

/* ============================
   Reset & Base
   ============================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body { font-family: var(--font-sans); color: var(--color-text); background: var(--color-white); line-height: 1.8; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; }

h1, h2, h3, h4, h5, h6 { font-family: var(--font-sans); line-height: 1.4; font-weight: 700; }
h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.6rem); }
p { margin-bottom: var(--spacing-sm); }
p:last-child { margin-bottom: 0; }

/* ============================
   Layout
   ============================ */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 var(--spacing-md); }
.section { padding: var(--spacing-2xl) 0; }
.section--gray { background: var(--color-off-white); }
.section--green { background: var(--color-primary); color: var(--color-white); }

.section__header { text-align: center; margin-bottom: var(--spacing-xl); }
.section__label { display: inline-block; font-size: 0.8rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--color-primary); margin-bottom: var(--spacing-xs); }
.section--green .section__label { color: rgba(255,255,255,0.7); }
.section__title { margin-bottom: var(--spacing-sm); }
.section__desc { color: var(--color-text-light); font-size: 1.05rem; max-width: 600px; margin: 0 auto; }
.section--green .section__desc { color: rgba(255,255,255,0.85); }

/* ============================
   Buttons
   ============================ */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; padding: 0.85rem 2rem; border-radius: var(--radius-sm); font-size: 0.95rem; font-weight: 700; letter-spacing: 0.04em; transition: all var(--transition); white-space: nowrap; }
.btn--primary { background: var(--color-accent); color: var(--color-white); border: 2px solid var(--color-accent); }
.btn--primary:hover { background: var(--color-accent-dark); border-color: var(--color-accent-dark); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn--outline { background: transparent; color: var(--color-primary); border: 2px solid var(--color-primary); }
.btn--outline:hover { background: var(--color-primary); color: var(--color-white); transform: translateY(-2px); }
.btn--white { background: var(--color-white); color: var(--color-primary); border: 2px solid var(--color-white); }
.btn--white:hover { background: transparent; color: var(--color-white); transform: translateY(-2px); }
.btn--outline-white { background: transparent; color: var(--color-white); border: 2px solid var(--color-white); }
.btn--outline-white:hover { background: var(--color-white); color: var(--color-primary); transform: translateY(-2px); }
.btn--lg { padding: 1rem 2.5rem; font-size: 1.05rem; }
.btn--sm { padding: 0.6rem 1.2rem; font-size: 0.85rem; }

/* ============================
   Cards
   ============================ */
.card { background: var(--color-white); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); padding: var(--spacing-lg); transition: box-shadow var(--transition), transform var(--transition); }
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }

/* ============================
   Grid
   ============================ */
.grid { display: grid; gap: var(--spacing-md); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* ============================
   Header
   ============================ */
#header-placeholder { height: var(--header-height); }

.site-header { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; height: var(--header-height); background: rgba(255,255,255,0.97); backdrop-filter: blur(8px); border-bottom: 1px solid transparent; transition: border-color var(--transition), box-shadow var(--transition); }
.site-header.scrolled { border-bottom-color: var(--color-border); box-shadow: var(--shadow-sm); }
.site-header__inner { display: flex; align-items: center; justify-content: space-between; height: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 var(--spacing-md); }
.site-logo { font-family: var(--font-serif); font-size: 1.05rem; font-weight: 700; color: var(--color-text); flex-shrink: 0; }
.site-logo span { color: var(--color-primary); }

.site-nav { display: flex; align-items: center; gap: var(--spacing-lg); }
.site-nav__links { display: flex; align-items: center; gap: var(--spacing-md); }
.site-nav__links a { font-size: 0.9rem; font-weight: 500; color: var(--color-text); transition: color var(--transition); position: relative; }
.site-nav__links a::after { content: ''; position: absolute; bottom: -3px; left: 0; right: 0; height: 2px; background: var(--color-primary); transform: scaleX(0); transition: transform var(--transition); }
.site-nav__links a:hover, .site-nav__links a.active { color: var(--color-primary); }
.site-nav__links a:hover::after, .site-nav__links a.active::after { transform: scaleX(1); }

.hamburger { display: none; flex-direction: column; gap: 5px; padding: 4px; }
.hamburger span { display: block; width: 24px; height: 2px; background: var(--color-text); border-radius: 2px; transition: all var(--transition); }
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-nav { display: none; position: fixed; top: var(--header-height); left: 0; right: 0; bottom: 0; background: var(--color-white); z-index: 999; padding: var(--spacing-lg); overflow-y: auto; }
.mobile-nav.open { display: block; }
.mobile-nav a { display: block; padding: var(--spacing-sm) 0; font-size: 1.1rem; font-weight: 500; border-bottom: 1px solid var(--color-border); color: var(--color-text); }
.mobile-nav a:hover { color: var(--color-primary); }
.mobile-nav .btn { margin-top: var(--spacing-lg); width: 100%; }

/* ============================
   Footer
   ============================ */
.site-footer { background: #1a1a1a; color: rgba(255,255,255,0.75); padding: var(--spacing-2xl) 0 var(--spacing-lg); }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: var(--spacing-xl); margin-bottom: var(--spacing-xl); }
.footer-brand__logo { font-family: var(--font-serif); font-size: 1.2rem; font-weight: 700; color: var(--color-white); margin-bottom: var(--spacing-sm); }
.footer-brand__logo span { color: #4CAF50; }
.footer-brand__desc { font-size: 0.9rem; line-height: 1.7; margin-bottom: var(--spacing-md); }
.footer-social { display: flex; gap: var(--spacing-sm); }
.footer-social a { display: flex; align-items: center; justify-content: center; width: 36px; height: 36px; border-radius: 50%; background: rgba(255,255,255,0.1); color: rgba(255,255,255,0.75); font-size: 0.85rem; font-weight: 700; transition: background var(--transition), color var(--transition); }
.footer-social a:hover { background: var(--color-primary); color: var(--color-white); }
.footer-nav__title { font-size: 0.85rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--color-white); margin-bottom: var(--spacing-md); }
.footer-nav__links { display: flex; flex-direction: column; gap: 0.6rem; }
.footer-nav__links a { font-size: 0.9rem; color: rgba(255,255,255,0.65); transition: color var(--transition); }
.footer-nav__links a:hover { color: var(--color-white); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: var(--spacing-md); text-align: center; font-size: 0.85rem; color: rgba(255,255,255,0.4); }

/* ============================
   CTA Banner
   ============================ */
.cta-banner { background: var(--color-accent); color: var(--color-white); padding: var(--spacing-2xl) 0; text-align: center; }
.cta-banner__title { font-family: var(--font-serif); font-size: clamp(1.5rem, 3vw, 2rem); margin-bottom: var(--spacing-sm); }
.cta-banner__desc { font-size: 1.05rem; color: rgba(255,255,255,0.85); margin-bottom: var(--spacing-lg); max-width: 500px; margin-left: auto; margin-right: auto; }
.cta-banner__btns { display: flex; gap: var(--spacing-sm); justify-content: center; flex-wrap: wrap; }

/* ============================
   Page Hero
   ============================ */
.page-hero { background: var(--color-primary-bg); padding: calc(var(--header-height) + var(--spacing-xl)) 0 var(--spacing-xl); text-align: center; }
.page-hero__label { display: inline-block; font-size: 0.8rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--color-primary); margin-bottom: var(--spacing-xs); }
.page-hero__title { margin-bottom: var(--spacing-sm); }
.page-hero__desc { color: var(--color-text-light); font-size: 1.05rem; max-width: 600px; margin: 0 auto; }

/* ============================
   Utilities
   ============================ */
.fade-in { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }
.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }

.tag { display: inline-block; padding: 0.2rem 0.7rem; font-size: 0.78rem; font-weight: 600; border-radius: 999px; background: var(--color-primary-bg); color: var(--color-primary); }
.divider { width: 48px; height: 3px; background: var(--color-primary); margin: var(--spacing-sm) auto; border-radius: 2px; }
.divider--left { margin-left: 0; }
.text-center { text-align: center; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }

/* ============================
   Responsive
   ============================ */
@media (max-width: 900px) {
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  :root { --spacing-xl: 3rem; --spacing-2xl: 4rem; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: var(--spacing-lg); }
  .site-nav__links, .site-nav .btn--sm { display: none; }
  .hamburger { display: flex; }
}