@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:wght@400;600&display=swap');

/* ============================================================
   IDEATECH - Genten (原典) Page Stylesheet  (prefix: ge-)
   グランドカラー準拠・フラットデザイン
   ============================================================ */

/* ページ全体をライト背景に */
body { background: var(--shiro1); color: var(--kuro1); }

/* ----------------------------------------
   1. Progress Bar
   ---------------------------------------- */
.ge-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--daidai);
  z-index: 1000;
  transition: none;
}

/* ----------------------------------------
   2. TOC
   ---------------------------------------- */
.ge-toc-toggle {
  position: fixed;
  top: 80px;
  right: 24px;
  z-index: 900;
  width: 40px;
  height: 40px;
  border: 0.5px solid var(--kuro4);
  border-radius: 4px;
  background: var(--kuro1);
  color: var(--shiro3);
  font-family: var(--font-mincho);
  font-size: 0.9rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s;
}

.ge-toc-toggle:hover {
  color: var(--shiro1);
}

.ge-toc-panel {
  position: fixed;
  top: 0;
  right: 0;
  width: min(480px, 85vw);
  height: 100vh;
  background: var(--kuro1);
  border-left: 0.5px solid var(--kuro4);
  z-index: 950;
  overflow-y: auto;
  padding: 80px 40px 40px;
  transform: translateX(100%);
  transition: transform 0.35s ease;
}

.ge-toc-panel.is-open {
  transform: translateX(0);
}

.ge-toc-panel h3 {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--shiro3);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 32px;
}

.ge-toc-panel a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 0;
  color: var(--shiro3);
  text-decoration: none;
  font-family: var(--font-mincho);
  font-size: 0.9rem;
  line-height: 1.6;
  border-bottom: 0.5px solid var(--kuro4);
  transition: color 0.2s;
}

.ge-toc-panel a:hover {
  color: var(--shiro1);
}

.ge-toc-num {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  color: var(--kuro4);
  min-width: 24px;
}

.ge-toc-overlay {
  position: fixed;
  inset: 0;
  background: var(--kuro1);
  opacity: 0;
  pointer-events: none;
  z-index: 940;
  transition: opacity 0.35s ease;
}

.ge-toc-overlay.is-open {
  opacity: 0.6;
  pointer-events: auto;
}

/* ----------------------------------------
   3. Cover (参照: hkisou-sketch/genten-lp)
   ---------------------------------------- */
.ge-cover {
  --ge-ink: #1c1915;
  --ge-paper: #f6f1e7;
  --ge-warm: #b8896a;
  --ge-warm-deep: #96643e;
  --ge-muted: #8a8078;

  min-height: 70vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 3rem 2rem;
  position: relative;
  background: var(--ge-ink);
  color: var(--ge-paper);
}

.ge-cover::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 50% at 30% 70%, rgba(184,137,106,0.08) 0%, transparent 60%),
    radial-gradient(ellipse 50% 70% at 70% 30%, rgba(184,137,106,0.05) 0%, transparent 50%);
  pointer-events: none;
}

.ge-cover__inner {
  position: relative;
  z-index: 1;
  max-width: 600px;
}

.ge-cover__label {
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.7rem;
  font-weight: 400;
  color: var(--ge-warm);
  letter-spacing: 0.5em;
  text-transform: uppercase;
  margin-bottom: 3rem;
  opacity: 0;
  animation: ge-fadeIn 1s 0.3s forwards;
}

.ge-cover__title {
  font-family: var(--font-mincho);
  font-size: clamp(2.2rem, 5.5vw, 3.6rem);
  font-weight: 800;
  color: var(--ge-paper);
  line-height: 1.5;
  letter-spacing: 0.12em;
  margin-bottom: 1rem;
  opacity: 0;
  animation: ge-fadeIn 1s 0.6s forwards;
}

.ge-cover__subtitle {
  font-family: var(--font-mincho);
  font-size: clamp(1rem, 2.5vw, 1.3rem);
  font-weight: 400;
  color: var(--ge-warm);
  letter-spacing: 0.2em;
  margin-bottom: 3rem;
  opacity: 0;
  animation: ge-fadeIn 1s 0.9s forwards;
}

.ge-cover__scroll-arrow {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, transparent, var(--ge-warm));
  opacity: 0;
  animation: ge-fadeIn 1s 1.1s forwards, ge-pulse 2.5s 2.1s infinite;
}

.ge-cover__company {
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.8rem;
  color: var(--ge-muted);
  letter-spacing: 0.3em;
  opacity: 0;
  animation: ge-fadeIn 1s 1.3s forwards;
}

.ge-cover__scroll {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  opacity: 0;
  animation: ge-fadeIn 1s 1.8s forwards;
}

.ge-cover__scroll-arrow {
  width: 1px;
  height: 50px;
  background: linear-gradient(to bottom, transparent, var(--ge-warm));
  margin: 0 auto;
  animation: ge-pulse 2.5s infinite;
}

@keyframes ge-fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes ge-pulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.8; }
}

/* ----------------------------------------
   4. Content area
   ---------------------------------------- */
.ge-content {
  position: relative;
  max-width: 720px;
  margin: 0 auto;
  padding: 0 40px;
}

.ge-content::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100vw;
  background: var(--shiro1);
  z-index: -1;
}

/* ----------------------------------------
   5. Preface
   ---------------------------------------- */
.ge-preface {
  padding: 96px 0;
  border-bottom: 0.5px solid var(--shiro3);
}

.ge-preface p.ge-preface__label {
  font-family: var(--font-mincho);
  font-size: 0.85rem;
  color: var(--daidai);
  letter-spacing: 0.2em;
  margin-bottom: 48px;
}

.ge-preface p {
  font-family: var(--font-mincho);
  font-size: 1rem;
  color: var(--kuro1);
  line-height: 2.2;
  margin-bottom: 1.5em;
}

/* ----------------------------------------
   6. Chapters
   ---------------------------------------- */
.ge-chapter {
  padding: 96px 0;
  border-bottom: 0.5px solid var(--shiro3);
}

.ge-chapter--alt {
  margin: 0 -40px;
  padding: 96px 40px;
}

.ge-chapter__header {
  margin-bottom: 48px;
}

.ge-chapter p.ge-chapter__num {
  font-family: var(--font-mincho);
  font-size: 0.85rem;
  color: var(--daidai);
  letter-spacing: 0.15em;
  margin-bottom: 12px;
}

.ge-chapter__title {
  font-family: var(--font-mincho);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--kuro1);
  line-height: 1.4;
  margin-bottom: 16px;
}

.ge-chapter__title::after {
  content: '';
  display: block;
  width: 30px;
  height: 1px;
  background: var(--daidai);
  margin-top: 16px;
}

.ge-chapter p {
  font-family: var(--font-mincho);
  font-size: 1rem;
  color: var(--kuro1);
  line-height: 2.2;
  margin-bottom: 1.5em;
}

/* ----------------------------------------
   7. Appendix
   ---------------------------------------- */
.ge-appendix {
  margin: 0 -40px;
  padding: 96px 40px;
}

.ge-appendix__title {
  font-family: var(--font-mincho);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--daidai);
  text-align: center;
  margin-bottom: 64px;
  letter-spacing: 0.15em;
}

.ge-appendix__word {
  margin-bottom: 64px;
}

.ge-appendix__word:last-child {
  margin-bottom: 0;
}

.ge-appendix__kanji {
  font-family: var(--font-mincho);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--kuro1);
  text-align: center;
  margin-bottom: 16px;
  letter-spacing: 0.2em;
}

.ge-appendix__sep {
  width: 24px;
  height: 1px;
  background: var(--daidai);
  margin: 0 auto 24px;
}

.ge-appendix__word p {
  font-family: var(--font-mincho);
  font-size: 0.95rem;
  color: var(--kuro1);
  line-height: 2;
  max-width: 600px;
  margin: 0 auto;
}

/* ----------------------------------------
   8. Colophon
   ---------------------------------------- */
.ge-colophon {
  padding: 64px 0;
  text-align: center;
  border-top: 0.5px solid var(--shiro3);
}

.ge-colophon__mark {
  font-family: var(--font-mincho);
  font-size: 0.85rem;
  color: var(--kuro4);
  letter-spacing: 0.1em;
}

/* ----------------------------------------
   9. Responsive
   ---------------------------------------- */
@media (max-width: 768px) {
  .ge-cover {
    padding: 64px 24px;
    min-height: 80vh;
  }

  .ge-content {
    padding: 0 24px;
  }

  .ge-preface,
  .ge-chapter {
    padding: 64px 0;
  }

  .ge-chapter--alt {
    margin: 0 -24px;
    padding: 64px 24px;
  }

  .ge-appendix {
    margin: 0 -24px;
    padding: 64px 24px;
  }

  .ge-toc-toggle {
    right: 16px;
    top: 72px;
  }

  .ge-toc-panel {
    padding: 64px 24px 24px;
  }
}

@media (max-width: 480px) {
  .ge-cover__title {
    font-size: 2.5rem;
  }

  .ge-preface p,
  .ge-chapter p {
    font-size: 0.95rem;
    line-height: 2;
  }

  .ge-toc-panel {
    width: 100vw;
  }
}