/* ============================================================
   Toru Tsugawa — Profile Page Styles
   Modern Vanilla CSS (2026) · Dark Theme · Typography-First
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Play:wght@700&display=swap');

/* --- Design Tokens --- */
:root {
  /* Colors */
  --c-bg: #09090b;
  --c-surface: #111114;
  --c-surface-2: #1a1a1f;
  --c-border: #27272e;
  --c-text: #ededf0;
  --c-text-secondary: #9898a6;
  --c-text-muted: #55555f;
  --c-accent: #c4a26e;
  --c-accent-hover: #d4b57e;
  --c-accent-dim: rgba(196, 162, 110, 0.1);

  /* Typography */
  --f-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --f-display: 'Play', var(--f-sans);
  --f-size-xs: clamp(0.7rem, 0.65rem + 0.25vw, 0.8125rem);
  --f-size-sm: clamp(0.8125rem, 0.75rem + 0.3vw, 0.9375rem);
  --f-size-base: clamp(0.9375rem, 0.875rem + 0.3vw, 1.0625rem);
  --f-size-lg: clamp(1.0625rem, 0.95rem + 0.55vw, 1.3125rem);
  --f-size-xl: clamp(1.375rem, 1.1rem + 1.35vw, 2.25rem);
  --f-size-2xl: clamp(1.75rem, 1.3rem + 2.2vw, 3.25rem);
  --f-size-hero: clamp(2.75rem, 1.5rem + 6.5vw, 9rem);

  /* Spacing */
  --s-xs: 0.5rem;
  --s-sm: 1rem;
  --s-md: 1.5rem;
  --s-lg: 3rem;
  --s-xl: 6rem;
  --s-section: clamp(6rem, 4rem + 8vw, 12rem);
  --content-pad: clamp(1.25rem, 0.75rem + 2.5vw, 4rem);
  --max-w: 1140px;

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --dur-fast: 200ms;
  --dur-base: 500ms;
  --dur-slow: 900ms;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  hanging-punctuation: first last;
}

body {
  font-family: var(--f-sans);
  font-size: var(--f-size-base);
  line-height: 1.7;
  color: var(--c-text);
  background-color: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

::selection {
  background: var(--c-accent);
  color: var(--c-bg);
}

:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 3px;
}

/* --- Noise Overlay (depth texture) --- */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.028;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 200px 200px;
}

/* --- Layout Utility --- */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--content-pad);
}

/* ==========================================================
   Navigation
   ========================================================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--s-md) var(--content-pad);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color var(--dur-base) var(--ease-in-out),
              backdrop-filter var(--dur-base) var(--ease-in-out);

  &.nav--scrolled {
    background-color: rgba(9, 9, 11, 0.8);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid var(--c-border);
  }

  & .nav__brand {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    text-decoration: none;
    color: var(--c-text);
    transition: opacity var(--dur-fast) var(--ease-in-out);

    &:hover {
      opacity: 0.8;
    }
  }

  & .nav__brand-logo {
    width: 41px;
    height: 41px;
    object-fit: contain;
    flex-shrink: 0;
  }

  & .nav__brand-text {
    font-family: var(--f-display);
    font-size: var(--f-size-lg);
    font-weight: 700;
    letter-spacing: 0.04em;
    color: var(--c-text);
    white-space: nowrap;
  }

  & .nav__links {
    display: flex;
    gap: clamp(1.5rem, 1rem + 2vw, 3rem);
  }

  & .nav__link {
    font-size: var(--f-size-xs);
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--c-text-secondary);
    position: relative;
    transition: color var(--dur-fast) var(--ease-in-out);

    &::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 1px;
      background: var(--c-accent);
      transition: width var(--dur-base) var(--ease-out);
    }

    &:hover {
      color: var(--c-text);

      &::after {
        width: 100%;
      }
    }
  }

  /* --- Hamburger Button (hidden on desktop) --- */
  & .nav__hamburger {
    display: none;
    position: relative;
    width: 28px;
    height: 20px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 110;
    -webkit-tap-highlight-color: transparent;
  }

  & .nav__hamburger-line {
    display: block;
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--c-text);
    border-radius: 1px;
    transition: transform 0.4s var(--ease-out),
                opacity 0.3s var(--ease-in-out),
                top 0.4s var(--ease-out);

    &:nth-child(1) { top: 0; }
    &:nth-child(2) { top: 9px; }
    &:nth-child(3) { top: 18px; }
  }

  /* Active state: × */
  & .nav__hamburger.is-active .nav__hamburger-line {
    &:nth-child(1) {
      top: 9px;
      transform: rotate(45deg);
    }
    &:nth-child(2) {
      opacity: 0;
    }
    &:nth-child(3) {
      top: 9px;
      transform: rotate(-45deg);
    }
  }
}

/* --- Mobile: show hamburger, hide links --- */
@media (max-width: 768px) {
  .nav .nav__links {
    display: none;
  }

  .nav .nav__hamburger {
    display: block;
  }
}

/* ==========================================================
   Mobile Overlay Menu
   ========================================================== */
.overlay-menu {
  position: fixed;
  inset: 0;
  z-index: 999;
  background-color: rgba(9, 9, 11, 0.97);
  backdrop-filter: blur(24px) saturate(120%);
  -webkit-backdrop-filter: blur(24px) saturate(120%);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.5s var(--ease-out),
              visibility 0.5s var(--ease-out);

  &.is-open {
    opacity: 1;
    visibility: visible;
  }
}

.overlay-menu__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(2rem, 1.5rem + 3vw, 3.5rem);
}

.overlay-menu__link {
  font-size: clamp(1.75rem, 1.2rem + 2.5vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-text-secondary);
  transition: color var(--dur-fast) var(--ease-in-out),
              transform var(--dur-base) var(--ease-out);
  transform: translateY(16px);
  opacity: 0;

  &:hover {
    color: var(--c-accent);
  }
}

/* Stagger links when menu opens */
.overlay-menu.is-open .overlay-menu__link {
  opacity: 1;
  transform: translateY(0);

  &:nth-child(1) { transition-delay: 0.08s; }
  &:nth-child(2) { transition-delay: 0.16s; }
  &:nth-child(3) { transition-delay: 0.24s; }
  &:nth-child(4) { transition-delay: 0.32s; }
}

/* ==========================================================
   Hero
   ========================================================== */

/* Fluid dark gradient animation ("breathing" effect) */
.hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  /* 修正: コントラストを少し上げて波の動きを可視化 */
  background: linear-gradient(
    -45deg,
    #09090b 0%,
    #091618 25%,   /* 暗いティール（青緑） */
    #09090b 50%,
    #0c141c 75%,   /* 暗いスチールブルー */
    #09090b 100%
  );
  background-size: 300% 300%;
  animation: hero-gradient-shift 7s ease-in-out infinite;
}

/* Film noise overlay on hero */
.hero__bg-noise {
  position: absolute;
  inset: 0;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 512 512' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23g)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
  mix-blend-mode: overlay;
  pointer-events: none;
}

@keyframes hero-gradient-shift {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.hero {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  min-height: 100dvh;
  padding: var(--s-xl) var(--content-pad);
  text-align: center;
  overflow: hidden;
}

.hero__role {
  font-size: var(--f-size-xs);
  font-weight: 500;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: var(--s-lg);
  opacity: 0;
  transform: translateY(16px);
  animation: hero-fade-in var(--dur-slow) var(--ease-out) 0.3s forwards;
}

.hero__name {
  font-size: var(--f-size-hero);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--c-text);
  opacity: 0;
  transform: translateY(24px);
  animation: hero-fade-in 1.1s var(--ease-out) 0.6s forwards;
}

.hero__name-ja {
  display: block;
  font-size: clamp(1.25rem, 0.8rem + 2.2vw, 2.75rem);
  font-weight: 300;
  letter-spacing: 0.18em;
  color: var(--c-text-secondary);
  margin-top: var(--s-sm);
  opacity: 0;
  animation: hero-fade-in var(--dur-slow) var(--ease-out) 0.9s forwards;
}

.hero__line {
  display: block;
  width: 48px;
  height: 1px;
  background: var(--c-accent);
  margin: var(--s-lg) auto 0;
  opacity: 0;
  transform: scaleX(0);
  animation: line-expand 1s var(--ease-out) 1.2s forwards;
}

.hero__scroll {
  position: absolute;
  bottom: clamp(2rem, 1.5rem + 2vw, 3.5rem);
  
  /* ▼ 修正: transformに依存しない絶対中央揃えに変更 */
  left: 0;
  right: 0;
  margin-inline: auto;
  width: fit-content;
  transform: translateY(16px); /* フェードイン前の初期位置 */

  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.625rem;
  color: var(--c-text-muted);
  font-size: 0.6875rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  opacity: 0;
  animation: hero-fade-in var(--dur-slow) var(--ease-out) 1.5s forwards;

  & span {
    display: block;
    width: 1px;
    height: 28px;
    background: linear-gradient(to bottom, var(--c-text-muted), transparent);
    animation: scroll-pulse 2.2s var(--ease-in-out) infinite;
  }
}

@keyframes hero-fade-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes line-expand {
  to {
    opacity: 1;
    transform: scaleX(1);
  }
}

@keyframes scroll-pulse {
  0%, 100% { opacity: 0.3; transform: scaleY(1); }
  50% { opacity: 1; transform: scaleY(1.4); }
}

/* ==========================================================
   Section Base
   ========================================================== */
.section {
  padding-block: var(--s-section);
}

.section__label {
  font-size: var(--f-size-xs);
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: var(--s-sm);
}

.section__heading {
  font-size: var(--f-size-2xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--c-text);
  margin-bottom: var(--s-lg);
}

/* ==========================================================
   About
   ========================================================== */
.about {
  border-top: 1px solid var(--c-border);
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-xl);
}

@media (min-width: 768px) {
  .about__grid {
    grid-template-columns: 1fr 320px;
    gap: clamp(3rem, 2rem + 4vw, 5rem);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .about__grid {
    grid-template-columns: 1fr 380px;
  }
}

.about__content {
  max-width: 680px;
}

.about__lead {
  font-size: var(--f-size-lg);
  line-height: 1.85;
  color: var(--c-text-secondary);
  margin-bottom: var(--s-md);

  &:last-of-type {
    margin-bottom: var(--s-lg);
  }

  & strong {
    color: var(--c-text);
    font-weight: 600;
  }
}

/* Profile Photo */
.about__photo {
  position: relative;
  overflow: hidden;
  border-radius: 8px;
  aspect-ratio: 768 / 1344;
  max-height: 600px;
}

.about__photo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  transition: transform 0.8s var(--ease-out);
}

.about__photo:hover .about__photo-img {
  transform: scale(1.03);
}

/* on mobile, limit photo height */
@media (max-width: 767px) {
  .about__photo {
    max-width: 320px;
    margin-inline: auto;
  }
}

/* ==========================================================
   Timeline
   ========================================================== */
.timeline {
  position: relative;
  padding-left: 2rem;
  margin-top: var(--s-lg);

  /* vertical line */
  &::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.5rem;
    bottom: 0.5rem;
    width: 1px;
    background: linear-gradient(to bottom, var(--c-accent), var(--c-border));
  }
}

.timeline__item {
  position: relative;
  padding-bottom: var(--s-lg);

  &:last-child {
    padding-bottom: 0;
  }

  /* dot on the line */
  &::before {
    content: '';
    position: absolute;
    left: calc(-2rem - 3px);
    top: 0.5rem;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--c-accent);
    box-shadow: 0 0 0 3px var(--c-bg);
  }
}

.timeline__year {
  display: block;
  font-size: var(--f-size-xs);
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--c-accent);
  margin-bottom: 0.375rem;
  font-variant-numeric: tabular-nums;
}

.timeline__title {
  font-size: var(--f-size-base);
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: 0.25rem;
}

.timeline__desc {
  font-size: var(--f-size-sm);
  color: var(--c-text-secondary);
  line-height: 1.6;
}

/* ==========================================================
   Expertise — Card UI
   ========================================================== */
.expertise {
  border-top: 1px solid var(--c-border);
}

.expertise__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-md);
}

@media (min-width: 640px) {
  .expertise__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .expertise__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Single card */
.expertise__card {
  position: relative;
  padding: var(--s-md) var(--s-md) var(--s-lg);
  border: 1px solid var(--c-border);
  border-radius: 8px;
  background: var(--c-surface);
  overflow: hidden;
  cursor: pointer; /* 修正: iOSでのタップ反応を促す */
  transition: border-color var(--dur-fast) var(--ease-in-out),
              background-color var(--dur-fast) var(--ease-in-out),
              transform var(--dur-base) var(--ease-out);

  &:hover,
  &:focus-visible {
    border-color: var(--c-accent);
    background-color: var(--c-surface-2);
    transform: translateY(-3px);
    outline: none;
  }

  &:hover .expertise__num,
  &:focus-visible .expertise__num {
    color: var(--c-accent);
  }
}

.expertise__num {
  font-size: var(--f-size-xs);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--c-text-muted);
  display: block;
  margin-bottom: var(--s-sm);
  transition: color var(--dur-fast) var(--ease-in-out);
}

.expertise__name {
  font-size: var(--f-size-base);
  font-weight: 600;
  color: var(--c-text);
  line-height: 1.4;
  margin-bottom: var(--s-sm);
}

.expertise__detail {
  font-size: var(--f-size-sm);
  color: var(--c-text-secondary);
  line-height: 1.6;
  opacity: 0;
  visibility: hidden; /* 修正: チラつき防止 */
  transform: translateY(8px);
  transition: opacity var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out),
              visibility var(--dur-base) var(--ease-out);
}

/* ホバーおよびフォーカス時のアクション */
.expertise__card:hover .expertise__detail,
.expertise__card:focus-visible .expertise__detail {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* 修正: スマホサイズ（768px以下）では常にテキストを表示する（モダンUXのベストプラクティス） */
@media (max-width: 768px) {
  .expertise__detail {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    margin-top: 0.5rem;
  }
  .expertise__card:hover,
  .expertise__card:focus-visible {
    transform: none; /* スマホタップ時のカードの不要な浮き上がりを防止 */
  }
}

/* ==========================================================
   Links Section
   ========================================================== */
.links {
  border-top: 1px solid var(--c-border);
}

.links__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

@media (min-width: 640px) {
  .links__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .links__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.links__item {
  border-bottom: 1px solid var(--c-border);
}

@media (min-width: 640px) {
  .links__item {
    &:nth-child(odd) {
      border-right: 1px solid var(--c-border);
    }
  }
}

@media (min-width: 1024px) {
  .links__item {
    border-right: 1px solid var(--c-border);

    &:nth-child(3n) {
      border-right: none;
    }

    /* reset 2-col odd rule */
    &:nth-child(odd) {
      border-right: 1px solid var(--c-border);
    }

    &:nth-child(3n) {
      border-right: none;
    }
  }
}

.links__anchor {
  display: flex;
  align-items: center;
  gap: var(--s-sm);
  padding: var(--s-md);
  transition: background-color var(--dur-fast) var(--ease-in-out),
              padding-left var(--dur-base) var(--ease-out);

  &:hover {
    background-color: var(--c-accent-dim);
    padding-left: var(--s-lg);
  }

  &:hover .links__icon {
    color: var(--c-accent);
  }

  &:hover .links__label {
    color: var(--c-text);
  }
}

.links__icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  color: var(--c-text-muted);
  transition: color var(--dur-fast) var(--ease-in-out);
}

/* X (Twitter) icon uses fill, not stroke */
.links__item:nth-child(7) .links__icon {
  fill: currentColor;
  stroke: none;
}

.links__label {
  font-size: var(--f-size-base);
  font-weight: 600;
  color: var(--c-text-secondary);
  transition: color var(--dur-fast) var(--ease-in-out);
}

.links__sub {
  font-size: var(--f-size-xs);
  color: var(--c-text-muted);
  margin-left: auto;
}

/* ==========================================================
   Footer / Contact
   ========================================================== */
.footer {
  border-top: 1px solid var(--c-border);
  padding-block: var(--s-section);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--s-lg);
}

.footer__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--f-display);
  font-size: var(--f-size-xl);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--c-text);
  white-space: nowrap;
  position: relative;
  transition: color var(--dur-fast) var(--ease-in-out);

  &::after {
    content: '→';
    font-size: 0.85em;
    transition: transform var(--dur-base) var(--ease-out);
  }

  &:hover {
    color: var(--c-accent);

    &::after {
      transform: translateX(6px);
    }
  }
}

/* Footer button row */
.footer__buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--s-sm);
}

.footer__btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--f-size-sm);
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: 0.75rem 1.75rem;
  border: 1px solid var(--c-border);
  border-radius: 100px;
  transition: color var(--dur-fast) var(--ease-in-out),
              border-color var(--dur-fast) var(--ease-in-out),
              background-color var(--dur-fast) var(--ease-in-out);

  & svg {
    width: 16px;
    height: 16px;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
  }
}

.footer__btn--primary {
  color: var(--c-bg);
  background-color: var(--c-accent);
  border-color: var(--c-accent);

  &:hover {
    background-color: var(--c-accent-hover);
    border-color: var(--c-accent-hover);
  }
}

.footer__btn--secondary {
  color: var(--c-text-muted);

  &:hover {
    color: var(--c-accent);
    border-color: var(--c-accent);
    background-color: var(--c-accent-dim);
  }
}

.footer__copy {
  font-size: var(--f-size-xs);
  color: var(--c-text-muted);
  letter-spacing: 0.04em;
}

/* ==========================================================
   Scroll Reveal Animations
   ========================================================== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}

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

.reveal-stagger {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out);
}

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

/* ==========================================================
   Accessibility: Reduced Motion
   ※OS設定でアニメーションをオフにしているユーザー向けの必須記述
   ========================================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .reveal,
  .reveal-stagger {
    opacity: 1;
    transform: none;
  }

  .hero__role,
  .hero__name,
  .hero__name-ja,
  .hero__line,
  .hero__scroll {
    opacity: 1;
    transform: none;
  }

  .expertise__detail {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .overlay-menu__link {
    opacity: 1;
    transform: none;
  }
}

/* ==========================================================
   Print Styles
   ========================================================== */
@media print {
  body {
    background: #fff;
    color: #000;
  }

  body::after {
    display: none;
  }

  .nav,
  .hero__scroll,
  .hero__line,
  .hero__bg,
  .nav__hamburger,
  .overlay-menu {
    display: none;
  }

  .hero {
    min-height: auto;
    padding-block: 2rem;
  }

  .section {
    padding-block: 2rem;
    break-inside: avoid;
  }

  .expertise__detail {
    opacity: 1;
    visibility: visible;
    transform: none;
  }
}

/* トップへ戻るボタン用（本番最適化版） */
.scroll-to-top-btn {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: #ffffff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 998; /* 全画面メニュー（999）の下に潜る */
  
  opacity: 0;
  visibility: hidden;
  transform: translateY(15px);
  /* パフォーマンスのため "all" は使わず個別指定 */
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
  padding: 0;
  outline: none;
  -webkit-tap-highlight-color: transparent; /* スマホのタップ時の青い枠を消す */
}

/* キーボード操作（Tabキー）時のフォーカスを見やすくする */
.scroll-to-top-btn:focus-visible {
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.4), 0 4px 12px rgba(0, 0, 0, 0.15);
}

.scroll-to-top-btn.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-to-top-btn:hover {
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
  transform: translateY(-3px);
}

.scroll-to-top-btn .ring {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.scroll-to-top-btn .ring circle {
  fill: transparent;
  stroke-width: 3.5;
}

.scroll-to-top-btn .ring__bg {
  stroke: rgba(196, 162, 110, 0.1);
}

.scroll-to-top-btn .ring__progress {
  stroke: #c4a26e;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.1s linear;
}

.scroll-to-top-btn .arrow {
  width: 24px;
  height: 24px;
  color: #c4a26e;
  position: relative;
  z-index: 2;
  transition: color 0.3s ease;
}

.scroll-to-top-btn:hover .arrow {
  color: #d4b57e;
}

/* スマホ用（768px以下） */
@media (max-width: 768px) {
  .scroll-to-top-btn {
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
  }
}