/* =============================================
   style.css — M2L studio 共通スタイル
   全ページで読み込む共通CSS
============================================= */

@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@300;400;500;600;700&family=Noto+Sans+JP:wght@300;400;500;600;700&display=swap');

/* =============================================
   CSS Variables
============================================= */
:root {
  --color-bg:        #f5f3ee;
  --color-surface:   #ede9e1;
  --color-ink:       #1a1916;
  --color-ink-mid:   #4a4740;
  --color-ink-light: #8a8680;
  --color-line:      #d0ccc4;
  --color-accent:    #3d5a52;
  --color-white:     #fafaf8;

  /* シンプル・モダンなサンセリフ統一 */
  --font-display: 'Manrope', 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', sans-serif;
  --font-body:    'Noto Sans JP', 'Manrope', 'Hiragino Kaku Gothic ProN', sans-serif;
  --font-mono:    'Courier New', monospace;

  --spacing-xs:  0.5rem;
  --spacing-sm:  1rem;
  --spacing-md:  2rem;
  --spacing-lg:  4rem;
  --spacing-xl:  8rem;

  --max-width: 1200px;
  --nav-height: 64px;
  --transition-base: 0.4s ease;
}

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

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

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-ink);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

/* =============================================
   Utility
============================================= */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

/* フェードイン（JS で .visible を付与） */
.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: 0.32s; }
.fade-in.delay-4 { transition-delay: 0.45s; }

/* セクション見出し */
.section-header {
  display: flex;
  align-items: baseline;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}
.section-number {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-ink-light);
  letter-spacing: 0.12em;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 3rem);
  font-weight: 300;
  letter-spacing: 0.03em;
}
.section-divider {
  flex: 1;
  height: 1px;
  background: var(--color-line);
  margin-left: var(--spacing-md);
}

/* =============================================
   Navigation
============================================= */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 100;
  padding: 0 var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.4s ease, border-color 0.4s ease;
  /* サブページはデフォルトで背景あり */
  background: rgba(245, 243, 238, 0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-line);
}

/* トップページのみ Hero上では透明 */
nav.hero-transparent {
  background: transparent;
  border-bottom-color: transparent;
}
nav.hero-transparent.scrolled {
  background: rgba(245, 243, 238, 0.96);
  border-bottom-color: var(--color-line);
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--color-ink);
  text-decoration: none;
  transition: color 0.4s ease;
  flex-shrink: 0;
}
.nav-logo span { color: var(--color-accent); }

/* ロゴの数字「2」を大文字高さに揃える（Cormorantの既定はオールドスタイル数字） */
.nav-logo,
.footer-logo,
.hero-name,
.m2lx-logotype {
  font-variant-numeric: lining-nums;
  font-feature-settings: "lnum" 1;
}

/* Hero上では白文字 */
nav.hero-transparent .nav-logo { color: rgba(250,250,248,0.92); }
nav.hero-transparent.scrolled .nav-logo { color: var(--color-ink); }

.nav-links {
  display: flex;
  gap: 0;
  list-style: none;
}
.nav-links li a {
  display: block;
  padding: 0 1.2rem;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--color-ink-mid);
  text-decoration: none;
  line-height: var(--nav-height);
  transition: color 0.3s ease;
  position: relative;
}
/* アクティブページに下線 */
.nav-links li a.active {
  color: var(--color-ink);
}
.nav-links li a.active::after {
  content: '';
  position: absolute;
  bottom: 12px;
  left: 1.2rem;
  right: 1.2rem;
  height: 1px;
  background: var(--color-accent);
}
.nav-links li a:hover { color: var(--color-accent); }

/* Hero上のリンク */
nav.hero-transparent .nav-links li a { color: rgba(250,250,248,0.65); }
nav.hero-transparent.scrolled .nav-links li a { color: var(--color-ink-mid); }
nav.hero-transparent .nav-links li a.active { color: rgba(250,250,248,0.95); }
nav.hero-transparent.scrolled .nav-links li a.active { color: var(--color-ink); }

/* モバイルハンバーガー */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 1px;
  background: var(--color-ink);
  transition: all 0.3s ease;
}
nav.hero-transparent .nav-toggle span { background: rgba(250,250,248,0.85); }
nav.hero-transparent.scrolled .nav-toggle span { background: var(--color-ink); }

/* =============================================
   Footer
============================================= */
footer {
  background: var(--color-ink);
  color: rgba(250,250,248,0.45);
  padding: var(--spacing-md) var(--spacing-md);
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}
.footer-logo {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 300;
  color: rgba(250,250,248,0.7);
  letter-spacing: 0.08em;
  text-decoration: none;
}
.footer-logo span { color: var(--color-accent); }
.footer-nav {
  display: flex;
  gap: var(--spacing-md);
  list-style: none;
}
.footer-nav a {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: rgba(250,250,248,0.35);
  text-decoration: none;
  transition: color 0.3s ease;
}
.footer-nav a:hover { color: rgba(250,250,248,0.7); }
.footer-copy {
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  width: 100%;
  text-align: right;
  margin-top: var(--spacing-sm);
  padding-top: var(--spacing-sm);
  border-top: 1px solid rgba(250,250,248,0.08);
}

/* =============================================
   内部ページ共通: ページヘッダー
============================================= */
.page-header {
  padding-top: calc(var(--nav-height) + var(--spacing-xl));
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-line);
  margin-bottom: var(--spacing-xl);
}
.page-header .container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}
.page-header-label {
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  color: var(--color-ink-light);
  text-transform: uppercase;
}
.page-header-title {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 6vw, 5.5rem);
  font-weight: 300;
  letter-spacing: 0.03em;
  line-height: 1.15;
}
.page-header-desc {
  font-size: 0.9rem;
  font-weight: 300;
  color: var(--color-ink-mid);
  line-height: 2;
  max-width: 520px;
  margin-top: var(--spacing-sm);
}

/* =============================================
   Responsive
============================================= */
@media (max-width: 768px) {
  :root {
    --spacing-xl: 5rem;
    --spacing-lg: 3rem;
  }

  /* モバイル：ハンバーガーメニューを全画面オーバーレイ + 中央配置 */
  .nav-links {
    display: none;
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    width: 100vw !important;
    height: 100vh !important;
    height: 100dvh !important; /* iOS Safari 対応 */
    background: rgba(13, 12, 10, 0.98) !important; /* 黒系背景 */
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    z-index: 99;
    padding: 0;
    margin: 0;
  }
  .nav-links.open {
    display: flex !important;
  }
  .nav-links li {
    list-style: none;
    text-align: center;
  }
  .nav-links li a {
    font-size: 1.6rem !important;
    line-height: 1.2 !important;
    padding: 0.6rem 1rem !important;
    color: rgba(250, 250, 248, 0.95) !important; /* 黒背景に白文字 */
    letter-spacing: 0.08em !important;
    text-decoration: none;
    display: inline-block;
  }
  .nav-links li a.active {
    color: var(--color-accent) !important; /* アクティブは深緑 */
  }
  .nav-links li a.active::after { display: none !important; }
  .nav-toggle { display: flex; z-index: 101; position: relative; }
  nav.hero-transparent .nav-toggle span { background: rgba(250,250,248,0.85); }

  .footer-nav { display: none; }
  .footer-copy { text-align: left; }

  .section-header { flex-wrap: wrap; }
  .section-divider { display: none; }
}