/* ===== Design System ===== */
:root {
  /* Colors — Dark Navy + Gold */
  --color-bg-primary: #0a1628;
  --color-bg-secondary: #0f1f3a;
  --color-bg-tertiary: #162a4a;
  --color-bg-card: rgba(22, 42, 74, 0.6);
  --color-bg-card-hover: rgba(25, 68, 142, 0.35);
  --color-gold: #c4a35a;
  --color-gold-light: #e0c97f;
  --color-gold-dark: #9a7d3a;
  --color-text-primary: #e8e4dc;
  --color-text-secondary: #a0a8b8;
  --color-text-muted: #6b7a92;
  --color-accent: #19448e;
  --color-accent-light: #2a5db0;
  --color-border: rgba(196, 163, 90, 0.15);
  --color-border-hover: rgba(196, 163, 90, 0.35);
  --color-glass: rgba(10, 22, 40, 0.75);
  --color-glass-light: rgba(255, 255, 255, 0.03);

  /* Typography */
  --font-serif: 'Noto Serif JP', 'Yu Mincho', '游明朝', serif;
  --font-sans: 'Noto Sans JP', 'Hiragino Sans', 'Yu Gothic', sans-serif;
  --font-size-xs: clamp(0.7rem, 0.65rem + 0.25vw, 0.8rem);
  --font-size-sm: clamp(0.8rem, 0.75rem + 0.3vw, 0.9rem);
  --font-size-base: clamp(0.9rem, 0.85rem + 0.3vw, 1rem);
  --font-size-md: clamp(1rem, 0.9rem + 0.5vw, 1.2rem);
  --font-size-lg: clamp(1.2rem, 1rem + 0.8vw, 1.6rem);
  --font-size-xl: clamp(1.5rem, 1.2rem + 1.2vw, 2.2rem);
  --font-size-2xl: clamp(2rem, 1.5rem + 2vw, 3.2rem);
  --font-size-3xl: clamp(2.5rem, 1.8rem + 3vw, 4.5rem);

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --space-3xl: 10rem;

  /* Layout */
  --max-width: 1200px;
  --max-width-narrow: 800px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --transition-fast: 200ms var(--ease-out);
  --transition-medium: 400ms var(--ease-out);
  --transition-slow: 700ms var(--ease-out);

  /* Borders */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: 1.8;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  overflow-x: hidden;
}

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

a:hover {
  color: var(--color-gold-light);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  list-style: none;
}

/* ===== Utility ===== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

.container--narrow {
  max-width: var(--max-width-narrow);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===== Reveal Animation ===== */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }

/* ===== Navigation ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-sm) 0;
  transition: background var(--transition-medium), box-shadow var(--transition-medium), padding var(--transition-medium);
}

.nav.is-scrolled {
  background: var(--color-glass);
  backdrop-filter: blur(20px) saturate(1.5);
  -webkit-backdrop-filter: blur(20px) saturate(1.5);
  box-shadow: 0 1px 0 var(--color-border);
  padding: var(--space-xs) 0;
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__brand {
  font-family: var(--font-serif);
  font-size: var(--font-size-md);
  font-weight: 700;
  color: var(--color-gold);
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav__brand-icon {
  width: 28px;
  height: 28px;
  border: 1.5px solid var(--color-gold);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transform: rotate(45deg);
}

.nav__brand-icon span {
  transform: rotate(-45deg);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav__link {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  letter-spacing: 0.04em;
  position: relative;
  padding-bottom: 2px;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-gold);
  transition: width var(--transition-medium);
}

.nav__link:hover {
  color: var(--color-gold-light);
}

.nav__link:hover::after {
  width: 100%;
}

/* Mobile Nav Toggle */
.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 32px;
  height: 24px;
  position: relative;
  z-index: 1001;
}

.nav__toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-gold);
  position: absolute;
  left: 0;
  transition: all var(--transition-fast);
}

.nav__toggle span:nth-child(1) { top: 0; }
.nav__toggle span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.nav__toggle span:nth-child(3) { bottom: 0; }

.nav__toggle.is-active span:nth-child(1) {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

.nav__toggle.is-active span:nth-child(2) {
  opacity: 0;
}

.nav__toggle.is-active span:nth-child(3) {
  bottom: 50%;
  transform: translateY(50%) rotate(-45deg);
}

/* ===== Hero Section ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__bg canvas {
  width: 100%;
  height: 100%;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(25, 68, 142, 0.2) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 30%, rgba(196, 163, 90, 0.08) 0%, transparent 50%),
              linear-gradient(180deg, transparent 0%, var(--color-bg-primary) 100%);
  z-index: 1;
}

.hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: var(--space-3xl) var(--space-md);
}

.hero__subtitle {
  font-family: var(--font-sans);
  font-size: var(--font-size-sm);
  color: var(--color-gold);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  margin-bottom: var(--space-md);
  opacity: 0;
  animation: fadeInUp 1s var(--ease-out) 0.3s forwards;
}

.hero__title {
  font-family: var(--font-serif);
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.3;
  margin-bottom: var(--space-sm);
  opacity: 0;
  animation: fadeInUp 1s var(--ease-out) 0.5s forwards;
}

.hero__title-accent {
  color: var(--color-gold);
  display: block;
}

.hero__description {
  font-size: var(--font-size-md);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin-inline: auto;
  margin-bottom: var(--space-lg);
  opacity: 0;
  animation: fadeInUp 1s var(--ease-out) 0.7s forwards;
}

.hero__author {
  font-family: var(--font-serif);
  font-size: var(--font-size-lg);
  color: var(--color-gold-light);
  letter-spacing: 0.15em;
  opacity: 0;
  animation: fadeInUp 1s var(--ease-out) 0.9s forwards;
}

.hero__scroll {
  position: absolute;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  letter-spacing: 0.1em;
  opacity: 0;
  animation: fadeInUp 1s var(--ease-out) 1.2s forwards;
}

.hero__scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(180deg, var(--color-gold) 0%, transparent 100%);
  animation: scrollPulse 2s ease-in-out infinite;
}

/* Decorative line divider */
.hero__line {
  width: 60px;
  height: 1px;
  background: var(--color-gold);
  margin: var(--space-md) auto;
  opacity: 0;
  animation: fadeInUp 1s var(--ease-out) 0.6s forwards;
}

/* ===== Section Common ===== */
.section {
  padding: var(--space-3xl) 0;
  position: relative;
}

.section__label {
  font-family: var(--font-sans);
  font-size: var(--font-size-xs);
  color: var(--color-gold);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  margin-bottom: var(--space-xs);
}

.section__title {
  font-family: var(--font-serif);
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
  line-height: 1.3;
}

.section__description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  max-width: 600px;
  line-height: 1.9;
}

.section__header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section__header .section__description {
  margin-inline: auto;
}

.section__divider {
  width: 40px;
  height: 2px;
  background: var(--color-gold);
  margin: var(--space-sm) auto;
}

/* Background texture overlays */
.section--alt {
  background: var(--color-bg-secondary);
}

.section--dark {
  background: linear-gradient(180deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 50%, var(--color-bg-primary) 100%);
}

/* ===== About / Author Section ===== */
.about {
  background: var(--color-bg-secondary);
  position: relative;
  overflow: hidden;
}

.about::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(196, 163, 90, 0.05) 0%, transparent 70%);
  pointer-events: none;
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-2xl);
  align-items: center;
}

.about__visual {
  position: relative;
}

.about__image-frame {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  aspect-ratio: 4 / 5;
  background: linear-gradient(135deg, var(--color-bg-tertiary) 0%, var(--color-bg-secondary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.about__image-placeholder {
  font-family: var(--font-serif);
  font-size: var(--font-size-3xl);
  color: var(--color-gold);
  opacity: 0.15;
  letter-spacing: 0.2em;
  writing-mode: vertical-rl;
}

.about__image-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  pointer-events: none;
}

.about__decorative {
  position: absolute;
  top: -12px;
  right: -12px;
  width: 80px;
  height: 80px;
  border: 1px solid var(--color-gold);
  border-radius: var(--radius-sm);
  opacity: 0.3;
}

.about__text .section__label {
  text-align: left;
}

.about__text .section__title {
  text-align: left;
}

.about__bio {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 2;
  margin-bottom: var(--space-lg);
}

.about__credentials {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.about__credential {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-glass-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.about__credential-icon {
  color: var(--color-gold);
  font-size: 1.1em;
}

.about__credential--motto {
  flex-basis: 100%;
  border-color: rgba(196, 163, 90, 0.3);
  background: rgba(196, 163, 90, 0.06);
  color: var(--color-gold-light);
  font-style: italic;
  letter-spacing: 0.03em;
}

/* ===== Author Timeline ===== */
.about__timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: var(--space-md) 0 var(--space-md);
  position: relative;
  padding-left: 1.4rem;
}

.about__timeline::before {
  content: '';
  position: absolute;
  left: 0.35rem;
  top: 0.4rem;
  bottom: 0.4rem;
  width: 2px;
  background: linear-gradient(
    to bottom,
    transparent,
    var(--color-gold-dark) 10%,
    var(--color-gold) 50%,
    var(--color-gold-dark) 90%,
    transparent
  );
  border-radius: 2px;
}

.about__timeline-item {
  display: flex;
  gap: var(--space-sm);
  padding: 0.55rem 0.8rem 0.55rem 0.6rem;
  position: relative;
  transition: background var(--transition-fast);
  border-radius: var(--radius-sm);
}

.about__timeline-item::before {
  content: '';
  position: absolute;
  left: -1.08rem;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-gold);
  box-shadow: 0 0 6px rgba(196, 163, 90, 0.6);
  z-index: 1;
}

.about__timeline-item:hover {
  background: rgba(196, 163, 90, 0.06);
}

.about__timeline-year {
  flex-shrink: 0;
  min-width: 8rem;
  font-size: var(--font-size-sm);
  color: var(--color-gold);
  font-weight: 600;
  letter-spacing: 0.03em;
  line-height: 1.6;
}

.about__timeline-event {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ===== Table of Contents Section ===== */
.toc {
  position: relative;
}

.toc__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-md);
}

.toc__card {
  position: relative;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  transition: all var(--transition-medium);
  backdrop-filter: blur(10px);
  overflow: hidden;
  cursor: default;
}

.toc__card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
  opacity: 0;
  transition: opacity var(--transition-medium);
}

.toc__card:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-border-hover);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3), 0 0 40px rgba(25, 68, 142, 0.1);
}

.toc__card:hover::before {
  opacity: 1;
}

.toc__card--linked {
  cursor: pointer;
}

.toc__card--linked .toc__card-link-icon {
  opacity: 1;
}

.toc__card-number {
  font-family: var(--font-serif);
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-gold);
  opacity: 0.12;
  position: absolute;
  top: var(--space-sm);
  right: var(--space-md);
  line-height: 1;
}

.toc__card-chapter {
  font-size: var(--font-size-xs);
  color: var(--color-gold);
  letter-spacing: 0.15em;
  margin-bottom: var(--space-xs);
}

.toc__card-title {
  font-family: var(--font-serif);
  font-size: var(--font-size-md);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
  line-height: 1.5;
  transition: color var(--transition-fast);
}

.toc__card:hover .toc__card-title {
  color: var(--color-gold-light);
}

.toc__card-excerpt {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}

.toc__card-link-icon {
  position: absolute;
  bottom: var(--space-md);
  right: var(--space-md);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  color: var(--color-gold);
  font-size: 14px;
  opacity: 0;
  transition: all var(--transition-fast);
}

.toc__card:hover .toc__card-link-icon {
  opacity: 1;
  border-color: var(--color-gold);
}

/* ===== Value Props Section ===== */
.values {
  background: var(--color-bg-secondary);
  position: relative;
  overflow: hidden;
}

.values::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border), transparent);
}

.values__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.values__card {
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-glass-light);
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
}

.values__card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 80px;
  background: radial-gradient(circle, rgba(196, 163, 90, 0.1) 0%, transparent 70%);
  pointer-events: none;
  transition: all var(--transition-medium);
}

.values__card:hover {
  border-color: var(--color-border-hover);
  transform: translateY(-4px);
}

.values__card:hover::before {
  width: 200px;
  height: 200px;
}

.values__icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-md);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1.5px solid var(--color-gold);
  border-radius: 50%;
  color: var(--color-gold);
  font-size: 24px;
  position: relative;
  z-index: 1;
}

.values__card-title {
  font-family: var(--font-serif);
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.values__card-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* ===== CTA / Book Section ===== */
.cta {
  position: relative;
  overflow: hidden;
}

.cta__inner {
  position: relative;
  text-align: center;
  padding: var(--space-2xl);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(25, 68, 142, 0.15) 0%, rgba(196, 163, 90, 0.05) 100%);
  backdrop-filter: blur(10px);
  overflow: hidden;
}

.cta__inner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--color-gold) 50%, transparent 100%);
}

.cta__title {
  font-family: var(--font-serif);
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.cta__text {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  max-width: 500px;
  margin-inline: auto;
  margin-bottom: var(--space-lg);
  line-height: 1.9;
}

.cta__button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-lg);
  background: linear-gradient(135deg, var(--color-gold-dark), var(--color-gold));
  color: var(--color-bg-primary);
  font-family: var(--font-serif);
  font-size: var(--font-size-base);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  letter-spacing: 0.05em;
}

.cta__button:hover {
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-light));
  color: var(--color-bg-primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(196, 163, 90, 0.3);
}

/* ===== Books Section ===== */
.books__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.books__card {
  display: flex;
  gap: var(--space-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  backdrop-filter: blur(10px);
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
}

.books__card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
  opacity: 0;
  transition: opacity var(--transition-medium);
}

.books__card:hover {
  border-color: var(--color-border-hover);
  background: var(--color-bg-card-hover);
  transform: translateY(-4px);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.3), 0 0 40px rgba(196, 163, 90, 0.06);
}

.books__card:hover::before {
  opacity: 1;
}

.books__cover-wrap {
  flex-shrink: 0;
  width: 110px;
}

.books__cover {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: var(--radius-sm);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  display: block;
}

.books__info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.books__label {
  font-size: var(--font-size-xs);
  color: var(--color-gold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 600;
  margin: 0;
}

.books__title {
  font-family: var(--font-serif);
  font-size: var(--font-size-md);
  font-weight: 700;
  color: var(--color-text-primary);
  margin: 0;
  line-height: 1.4;
}

.books__subtitle {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  font-style: italic;
  margin: 0;
}

.books__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: 0.2rem;
}

.books__meta-item {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.books__meta-icon {
  color: var(--color-gold);
  font-size: 0.7em;
}

.books__desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin: 0.2rem 0 0;
  flex: 1;
}

.books__btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: auto;
  padding: 0.45rem 1rem;
  background: transparent;
  border: 1px solid var(--color-gold-dark);
  border-radius: var(--radius-sm);
  color: var(--color-gold);
  font-size: var(--font-size-xs);
  font-weight: 600;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  align-self: flex-start;
}

.books__btn:hover {
  background: var(--color-gold);
  color: var(--color-bg-primary);
  border-color: var(--color-gold);
  box-shadow: 0 4px 16px rgba(196, 163, 90, 0.25);
}

.books__cta {
  text-align: center;
  padding-top: var(--space-md);
}


/* ===== Footer ===== */
.footer {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-primary);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer__brand {
  font-family: var(--font-serif);
  font-size: var(--font-size-sm);
  color: var(--color-gold);
}

.footer__copy {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.footer__links {
  display: flex;
  gap: var(--space-md);
}

.footer__link {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-gold);
}

/* ===== Keyframe Animations ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scrollPulse {
  0%, 100% {
    opacity: 0.4;
    transform: scaleY(1);
  }
  50% {
    opacity: 1;
    transform: scaleY(1.2);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .about__grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .about__visual {
    max-width: 400px;
    margin-inline: auto;
  }

  .about__text .section__label,
  .about__text .section__title {
    text-align: center;
  }

  .about__bio {
    text-align: center;
  }

  .about__credentials {
    justify-content: center;
  }

  .values__grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin-inline: auto;
  }
}

@media (max-width: 768px) {
  .nav__links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--color-bg-secondary);
    border-left: 1px solid var(--color-border);
    flex-direction: column;
    justify-content: center;
    padding: var(--space-xl);
    transition: right var(--transition-medium);
  }

  .nav__links.is-open {
    right: 0;
  }

  .nav__toggle {
    display: block;
  }

  .nav__link {
    font-size: var(--font-size-md);
  }

  .hero__content {
    padding: var(--space-2xl) var(--space-sm);
  }

  .toc__grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: var(--space-2xl) 0;
  }

  .cta__inner {
    padding: var(--space-xl) var(--space-md);
  }

  .footer__inner {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero__title {
    font-size: var(--font-size-xl);
  }

  .toc__card {
    padding: var(--space-md);
  }
}

/* ===== Mobile menu overlay ===== */
.nav__overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-medium);
}

.nav__overlay.is-visible {
  opacity: 1;
  pointer-events: all;
}

/* ===== Decorative Elements ===== */
.deco-line {
  width: 40px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-gold), transparent);
}

.deco-dot {
  width: 6px;
  height: 6px;
  background: var(--color-gold);
  border-radius: 50%;
}

/* ===== Loading Screen ===== */
.loader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--color-bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.6s var(--ease-out), visibility 0.6s;
}

.loader.is-hidden {
  opacity: 0;
  visibility: hidden;
}

.loader__content {
  text-align: center;
}

.loader__kanji {
  font-family: var(--font-serif);
  font-size: var(--font-size-2xl);
  color: var(--color-gold);
  letter-spacing: 0.3em;
  animation: float 2s ease-in-out infinite;
}

.loader__bar {
  width: 120px;
  height: 1px;
  background: var(--color-border);
  margin: var(--space-md) auto 0;
  position: relative;
  overflow: hidden;
}

.loader__bar::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 40%;
  background: var(--color-gold);
  animation: loaderSlide 1.2s var(--ease-in-out) infinite;
}

@keyframes loaderSlide {
  0% { left: -40%; }
  100% { left: 100%; }
}