@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@300;400;600;700&family=Noto+Sans+JP:wght@300;400;500;700&family=Noto+Serif+JP:wght@400;600;700&family=Shippori+Mincho+B1:wght@500;600;800&display=swap');

/* ==========================================================================
   DESIGN TOKENS (DESIGN SYSTEM)
   ========================================================================== */
:root {
  /* Colors */
  --bg-primary: #fbfbfa;
  /* オフホワイト */
  --bg-secondary: #e5ecee;
  /* ミストグレー */
  --bg-dark: #0f141c;
  --bg-dark-card: #202a3a;

  --text-dark: #0f172a;
  --text-dark-muted: #687680;
  /* ミストグレー調和ミューテッド */
  --text-light: #f1f5f9;
  --text-light-muted: #94a3b8;

  --accent-gold: #dfca9f;
  /* シアーゴールド (透明感のある金) */
  --accent-gold-hover: #cfb683;
  --accent-gold-glow: rgba(223, 202, 159, 0.3);

  --accent-gold-heavy: #b5924a;
  /* 重厚感のあるブラスゴールド */
  --accent-gold-heavy-hover: #9c7c3c;
  --accent-gold-heavy-glow: rgba(181, 146, 74, 0.3);

  --line-light: rgba(104, 118, 128, 0.12);
  /* ミストグレー調和ボーダー */
  --line-dark: rgba(226, 232, 240, 0.08);

  /* Typography */
  --font-serif: 'Shippori Mincho B1', 'Noto Serif JP', serif;
  --font-sans: 'Noto Sans JP', sans-serif;
  --font-num: 'Montserrat', sans-serif;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.1);
  --shadow-dark-lg: 0 20px 50px rgba(0, 0, 0, 0.5);

  /* Transitions */
  --transition-smooth: 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* ==========================================================================
   BASE & RESET
   ========================================================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}

body {
  font-family: var(--font-sans);
  color: var(--text-dark);
  background-color: var(--bg-primary);
  line-height: 1.85;
  letter-spacing: 0.03em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  text-align: center;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.04em;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  pointer-events: none;
}

ul,
ol {
  list-style: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px;
  position: relative;
}

@media (max-width: 768px) {
  .container {
    padding: 0 24px;
  }
}

/* ==========================================================================
   LAYOUT & UTILITIES
   ========================================================================== */
.section {
  padding: 90px 0;
  position: relative;
}

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

.section.bg-dark {
  background-color: var(--bg-dark);
  color: var(--text-light);
}

@media (max-width: 768px) {
  .section {
    padding: 63px 0;
  }
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.25em;
  color: var(--accent-gold);
  text-transform: uppercase;
  margin-bottom: 20px;
  position: relative;
  padding-left: 30px;
}

.eyebrow::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 18px;
  height: 1px;
  background-color: var(--accent-gold);
}

.section-title {
  font-size: clamp(28px, 4vw, 42px);
  margin-bottom: 24px;
  font-weight: 500;
}

.section-desc {
  font-size: 15px;
  color: var(--text-dark-muted);
  max-width: 600px;
  margin: 0 auto 60px;
}

.bg-dark .section-desc {
  color: var(--text-light-muted);
}



.align-center {
  text-align: center;
}

/* ==========================================================================
   SCROLL REVEAL EFFECT
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 1.2s cubic-bezier(0.16, 1, 0.3, 1), transform 1.2s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: transform, opacity;
}

.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 {
  transition-delay: 0.15s;
}

.reveal-delay-2 {
  transition-delay: 0.3s;
}

.reveal-delay-3 {
  transition-delay: 0.45s;
}

/* ==========================================================================
   SECTION BACKGROUND GRADIENT TRANSITIONS (滑らかな背景色切り替え演出)
   ========================================================================== */

/* --- 1. PC版 (画面幅 769px 以上) --- */
@media (min-width: 769px) {

  /* bg-primary(default) -> bg-secondary */
  .section:not(.bg-secondary):not(.bg-dark)+.section.bg-secondary {
    background: linear-gradient(to bottom, var(--bg-primary) 0%, var(--bg-secondary) 180px, var(--bg-secondary) 100%);
  }

  /* bg-secondary -> bg-primary(default) */
  .section.bg-secondary+.section:not(.bg-secondary):not(.bg-dark) {
    background: linear-gradient(to bottom, var(--bg-secondary) 0%, var(--bg-primary) 180px, var(--bg-primary) 100%);
  }

  /* bg-primary(default) -> bg-dark */
  .section:not(.bg-secondary):not(.bg-dark)+.section.bg-dark {
    background: linear-gradient(to bottom, var(--bg-primary) 0%, var(--bg-dark) 180px, var(--bg-dark) 100%);
  }

  /* bg-dark -> bg-primary(default) */
  .section.bg-dark+.section:not(.bg-secondary):not(.bg-dark) {
    background: linear-gradient(to bottom, var(--bg-dark) 0%, var(--bg-primary) 180px, var(--bg-primary) 100%);
  }

  /* bg-secondary -> bg-dark */
  .section.bg-secondary+.section.bg-dark {
    background: linear-gradient(to bottom, var(--bg-secondary) 0%, var(--bg-dark) 180px, var(--bg-dark) 100%);
  }

  /* bg-dark -> bg-secondary */
  .section.bg-dark+.section.bg-secondary {
    background: linear-gradient(to bottom, var(--bg-dark) 0%, var(--bg-secondary) 180px, var(--bg-secondary) 100%);
  }

  /* --- ヒーローセクションからの接続 (PC) --- */
  /* インデックスページ (ヒーロー底色 #080b12 -> 第1セクション: bg-secondary) */
  header.hero-wrapper+.section.bg-secondary {
    background: var(--bg-secondary);
  }

  /* 税理士・経営者ページ (スプリットヒーロー背景: bg-secondary -> 第1セクション: bg-primary) */
  header.hero-wrapper.split-hero+.section:not(.bg-secondary):not(.bg-dark) {
    background: linear-gradient(to bottom, var(--bg-secondary) 0%, var(--bg-primary) 180px, var(--bg-primary) 100%);
  }

  /* --- フッターへの接続 (PC) --- */
  /* インデックスページ最終セクション: bg-secondary -> フッター: bg-dark */
  .section.bg-secondary+.footer {
    background: linear-gradient(to bottom, var(--bg-secondary) 0%, var(--bg-dark) 80px, var(--bg-dark) 100%);
    border-top: none;
  }
}

/* --- 2. モバイル版 (画面幅 768px 以下) --- */
@media (max-width: 768px) {

  /* bg-primary(default) -> bg-secondary */
  .section:not(.bg-secondary):not(.bg-dark)+.section.bg-secondary {
    background: linear-gradient(to bottom, var(--bg-primary) 0%, var(--bg-secondary) 120px, var(--bg-secondary) 100%);
  }

  /* bg-secondary -> bg-primary(default) */
  .section.bg-secondary+.section:not(.bg-secondary):not(.bg-dark) {
    background: linear-gradient(to bottom, var(--bg-secondary) 0%, var(--bg-primary) 120px, var(--bg-primary) 100%);
  }

  /* bg-primary(default) -> bg-dark */
  .section:not(.bg-secondary):not(.bg-dark)+.section.bg-dark {
    background: linear-gradient(to bottom, var(--bg-primary) 0%, var(--bg-dark) 120px, var(--bg-dark) 100%);
  }

  /* bg-dark -> bg-primary(default) */
  .section.bg-dark+.section:not(.bg-secondary):not(.bg-dark) {
    background: linear-gradient(to bottom, var(--bg-dark) 0%, var(--bg-primary) 120px, var(--bg-primary) 100%);
  }

  /* bg-secondary -> bg-dark */
  .section.bg-secondary+.section.bg-dark {
    background: linear-gradient(to bottom, var(--bg-secondary) 0%, var(--bg-dark) 120px, var(--bg-dark) 100%);
  }

  /* bg-dark -> bg-secondary { */
  .section.bg-dark+.section.bg-secondary {
    background: linear-gradient(to bottom, var(--bg-dark) 0%, var(--bg-secondary) 120px, var(--bg-secondary) 100%);
  }

  /* --- ヒーローセクションからの接続 (モバイル) --- */
  /* インデックスページ (ヒーロー底色: #080b12 -> 第1セクション: bg-secondary) */
  header.hero-wrapper+.section.bg-secondary {
    background: var(--bg-secondary);
  }

  /* 税理士・経営者ページ (ヒーロー背景: #080b12 -> 第1セクション: bg-primary) */
  header.hero-wrapper+.section:not(.bg-secondary):not(.bg-dark) {
    background: linear-gradient(to bottom, #080b12 0%, var(--bg-primary) 120px, var(--bg-primary) 100%);
  }

  /* --- フッターへの接続 (モバイル) --- */
  .section.bg-secondary+.footer {
    background: linear-gradient(to bottom, var(--bg-secondary) 0%, var(--bg-dark) 60px, var(--bg-dark) 100%);
    border-top: none;
  }
}

/* ==========================================================================
   COMMON KEYFRAMES (COMMON ANIMATIONS)
   ========================================================================== */
@keyframes hero-fade-in {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes sparkle-main {
  0%, 30%, 60%, 100% { transform: scale(0) rotate(0deg); opacity: 0; }
  43% { transform: scale(1.2) rotate(90deg); opacity: 1; }
  48% { transform: scale(0) rotate(180deg); opacity: 0; }
}

@keyframes sparkle-sub {
  0%, 35%, 65%, 100% { transform: scale(0) rotate(0deg); opacity: 0; }
  47% { transform: scale(1) rotate(90deg); opacity: 1; }
  52% { transform: scale(0) rotate(180deg); opacity: 0; }
}

@keyframes border-sparkle-flow-scroll {
  0% { stroke-dashoffset: 1200; }
  80% { stroke-dashoffset: 200; opacity: 1; }
  100% { stroke-dashoffset: 200; opacity: 0; }
}

@keyframes border-sparkle-flow-hover {
  0% { stroke-dashoffset: 1200; opacity: 1; }
  90% { stroke-dashoffset: 200; opacity: 1; }
  100% { stroke-dashoffset: 200; opacity: 0; }
}

@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

@keyframes ken-burns-meetup {
  0% { transform: scale(1.08) translate(0%, 0.5%); }
  50% { transform: scale(1.15) translate(-0.5%, -0.5%); }
  100% { transform: scale(1.1) translate(0.5%, 1%); }
}

@keyframes chat-float {
  0% { transform: translateY(0) translateX(0) scale(0.5); opacity: 0; }
  15% { opacity: 0.5; }
  50% { transform: translateY(-140px) translateX(15px) scale(1.2); opacity: 0.7; }
  85% { opacity: 0.2; }
  100% { transform: translateY(-260px) translateX(-10px) scale(0.7); opacity: 0; }
}

@keyframes scrollHintPulse {
  0%, 100% { transform: translateX(0); opacity: 0.85; }
  50% { transform: translateX(4px); opacity: 1; }
}