/*
 * Minimal-Tech Theme
 * サンセリフ統一・モノクローム基調・控えめなアクセント
 * style.css と project-styles.css の後で読み込み、上書きする
 */

/* ===== カラー・フォント・サイズの差し替え ===== */
:root {
  --color-primary: #111315;
  --color-secondary: #1f5a4a;        /* 深めティール・アクセント */
  --color-bg: #fafaf8;               /* ほぼ白の紙色 */
  --color-text: #14161a;             /* 本文は黒に近く */
  --color-text-light: #4a4e55;       /* サブテキストも濃いめに */
  --color-heading: #0a0b0e;
  --color-white: #ffffff;
  --color-light: #ececeb;
  --color-accent: #1f5a4a;
  --color-success: #1f5a4a;
  --color-warning: #b25a2e;
  --color-danger: #b53a2b;
  --color-line: rgba(15, 17, 21, 0.18);
  --color-line-strong: rgba(15, 17, 21, 0.6);

  --font-display: 'Inter', 'Noto Sans JP', 'Helvetica Neue', sans-serif;
  --font-heading: 'Inter', 'Noto Sans JP', 'Helvetica Neue', sans-serif;
  --font-body: 'Inter', 'Noto Sans JP', 'Helvetica Neue', sans-serif;
  --font-meta: 'Inter', 'Helvetica Neue', sans-serif;

  --container-max-width: 1180px;
  --header-height: 72px;
  --section-spacing: 7rem;
  --section-spacing-mobile: 4.5rem;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  font-feature-settings: "palt" 1, "kern" 1, "ss01" 1, "cv11" 1;
  -webkit-font-smoothing: antialiased;
  font-size: 17.5px;
  line-height: 1.78;
  counter-reset: section;
}

/* container の左右パディングを増やしてサイドの余白をしっかり確保 */
.container {
  padding-left: 2.5rem;
  padding-right: 2.5rem;
}

a { color: var(--color-heading); text-decoration: none; }
a:hover { color: var(--color-accent); }

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--color-heading);
  letter-spacing: -0.015em;
  line-height: 1.25;
}

/* ===== セクション共通 ===== */
section { padding: var(--section-spacing) 0; }

.section-title {
  counter-increment: section;
  text-align: left;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: clamp(2rem, 3.4vw, 2.8rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin-bottom: 3rem;
  padding-bottom: 0;
  position: relative;
  color: var(--color-heading);
}
.section-title::before {
  content: counter(section, decimal-leading-zero);
  display: block;
  font-family: var(--font-meta);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-text-light);
  margin-bottom: 0.85rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--color-line);
}
.section-title::after { display: none; }

/* ===== ヘッダー ===== */
.header {
  background-color: transparent;
  box-shadow: none;
  border-bottom: 1px solid transparent;
  height: var(--header-height);
  transition: background-color 0.35s ease, border-color 0.35s ease, backdrop-filter 0.35s ease;
}
.header.scrolled {
  background-color: rgba(250, 250, 248, 0.85);
  border-bottom-color: var(--color-line);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
}
.logo a {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
  color: var(--color-heading);
  font-style: normal;
}
.nav-menu { gap: 2rem; }
.nav-link {
  font-family: var(--font-meta);
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  text-transform: none;
  color: var(--color-text);
  position: relative;
  padding-bottom: 0.25rem;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 1px;
  background-color: var(--color-heading);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}
.nav-link:hover { color: var(--color-heading); }
.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
  transform-origin: left;
}
.nav-link.active { color: var(--color-heading); }

/* ===== ヒーロー ===== */
.hero {
  height: auto;
  min-height: 88vh;
  display: block;
  padding: 0;
  margin-top: 0;
  position: relative;
  background-color: var(--color-bg);
  background-image: none;
  color: var(--color-text);
  overflow: hidden;
}
.hero::before {
  content: none;
  background: none;
  display: none;
}
.hero-container {
  position: relative;
  min-height: 88vh;
  padding: calc(var(--header-height) + 2rem) 1.5rem 3rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  max-width: var(--container-max-width);
  margin: 0 auto;
}
.hero .container::before,
.hero .container::after { content: none; display: none; }

.hero-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--font-meta);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-light);
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--color-line);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 5rem;
  align-items: center;
  flex: 1;
  padding: 3.5rem 0 2.5rem;
}

.hero-text { position: relative; z-index: 2; }

.hero-eyebrow {
  font-family: var(--font-meta);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1.5rem;
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
}
.hero-eyebrow::before {
  content: "";
  display: inline-block;
  width: 24px;
  height: 1px;
  background-color: var(--color-accent);
}

.hero-name {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: clamp(2.4rem, 4.6vw, 3.6rem);
  line-height: 1.1;
  letter-spacing: -0.035em;
  color: var(--color-heading);
  margin: 0 0 1.5rem;
}
.hero-name-line { display: block; }
.hero-name-italic {
  font-style: normal;
  font-weight: 600;
  color: var(--color-heading);
  padding-left: 0;
}

.hero-lede {
  font-family: var(--font-body);
  font-style: normal;
  font-size: clamp(1.05rem, 1.35vw, 1.2rem);
  line-height: 1.7;
  font-weight: 400;
  color: var(--color-text);
  max-width: 38ch;
  margin: 0 0 1.25rem;
}
.hero-lede br { display: inline; }

.hero-jp {
  font-family: var(--font-meta);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: none;
  color: var(--color-text-light);
  margin: 0;
}

/* ポートレート */
.hero-portrait {
  position: relative;
  margin: 0;
  align-self: stretch;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}
.hero-portrait img {
  width: 100%;
  height: auto;
  max-height: 64vh;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  object-position: 35% 32%;
  display: block;
  border-radius: 4px;
  filter: grayscale(0.3) contrast(1.02);
  transition: filter 500ms ease, transform 700ms cubic-bezier(0.22, 1, 0.36, 1);
}
.hero-portrait:hover img {
  filter: grayscale(0) contrast(1);
  transform: scale(1.01);
}
.hero-portrait-caption {
  display: flex;
  justify-content: space-between;
  margin-top: 0.75rem;
  font-family: var(--font-meta);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-light);
}

/* スクロールヒント */
.hero-scroll {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  font-family: var(--font-meta);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-light);
  align-self: flex-start;
  padding-top: 0.5rem;
}
.hero-scroll:hover { color: var(--color-heading); }
.hero-scroll-line {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 1px;
  background-color: var(--color-line-strong);
  overflow: hidden;
}
.hero-scroll-line::after {
  content: "";
  position: absolute;
  inset: 0;
  background-color: var(--color-heading);
  transform: translateX(-100%);
  animation: heroScrollLine 2.4s ease-in-out infinite;
}
@keyframes heroScrollLine {
  0%   { transform: translateX(-100%); }
  50%  { transform: translateX(0); }
  100% { transform: translateX(100%); }
}

/* ===== About ===== */
.about-content {
  display: grid;
  grid-template-columns: 1fr 2.5fr;
  gap: 5rem;
  align-items: start;
}
.about-image img {
  border-radius: 4px !important;
  width: 100% !important;
  height: auto !important;
  aspect-ratio: 4 / 5;
  object-fit: cover;
}
.about-text h3 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.35rem;
  letter-spacing: -0.005em;
  text-transform: none;
  color: var(--color-heading);
  margin-bottom: 1.2rem;
}
.about-description {
  font-family: var(--font-body);
  font-size: 1.15rem;
  line-height: 1.9;
  margin-bottom: 2rem;
  color: var(--color-text);
  font-weight: 400;
}
.about-details {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--color-line);
}
.detail-item h4 {
  font-family: var(--font-meta);
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0;
  text-transform: none;
  color: var(--color-text-light);
  margin-bottom: 0.35rem;
}
.detail-item p {
  font-family: var(--font-body);
  font-size: 1.12rem;
  font-weight: 500;
  margin-bottom: 0;
  color: var(--color-heading);
}

/* ===== Timeline ===== */
.timeline {
  margin-top: 5rem;
  padding-top: 3rem;
  border-top: 1px solid var(--color-line);
}
.timeline > h3,
.skills > h3 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.35rem;
  letter-spacing: -0.005em;
  text-transform: none;
  color: var(--color-heading);
  margin-bottom: 1.5rem;
}
.timeline-item {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 3rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--color-line);
}
.timeline-item:last-child { border-bottom: 1px solid var(--color-line); }
.timeline-date {
  font-family: var(--font-meta);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0;
  text-transform: none;
  color: var(--color-text-light);
  background: none;
  padding: 0;
}
.timeline-content h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: -0.005em;
  margin-bottom: 0.5rem;
}
.timeline-content p {
  font-size: 1.08rem;
  color: var(--color-text);
  line-height: 1.78;
  margin: 0;
}

/* ===== Skills ===== */
.skills {
  margin-top: 5rem;
  padding-top: 3rem;
  border-top: 1px solid var(--color-line);
}
.skills-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}
.skill-category h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.32rem;
  margin-bottom: 1.3rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-line);
  letter-spacing: -0.005em;
}
.skill-item {
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--color-line);
}
.skill-item:last-child { border-bottom: none; }
.skill-name {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.3rem;
  color: var(--color-heading);
  display: block;
  margin-bottom: 0.5rem;
}
.skill-description {
  font-size: 1.12rem;
  color: var(--color-text);
  line-height: 1.78;
}

/* ===== Projects ===== */
.projects-filter {
  justify-content: flex-start;
  gap: 0;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}
.filter-btn {
  background-color: transparent;
  border: none;
  border-bottom: 1px solid transparent;
  border-radius: 0;
  font-family: var(--font-meta);
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0;
  text-transform: none;
  padding: 0.6rem 0;
  margin-right: 1.75rem;
  color: var(--color-text-light);
  cursor: pointer;
  transition: color 0.25s ease, border-color 0.25s ease;
}
.filter-btn:hover { color: var(--color-heading); }
.filter-btn.active,
.filter-btn:hover.active {
  background-color: transparent;
  color: var(--color-heading);
  border-bottom-color: var(--color-heading);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 3.5rem 2rem;
}
.projects-grid .project-card {
  background-color: transparent;
  border-radius: 0;
  box-shadow: none;
  overflow: visible;
  padding-top: 0;
  border-top: none;
}
.projects-grid .project-card:hover {
  transform: translateY(-4px);
  box-shadow: none;
}
.project-image {
  border-radius: 4px;
  aspect-ratio: 16 / 10;
  height: auto;
  overflow: hidden;
  background-color: var(--color-light);
}
.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center center;
  transition: transform 600ms cubic-bezier(0.22, 1, 0.36, 1);
  filter: none;
}
.project-card:hover .project-image img {
  transform: scale(1.04);
}
.project-content {
  padding: 1.25rem 0 0;
}
.project-title {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.28rem;
  line-height: 1.35;
  letter-spacing: -0.01em;
  margin-bottom: 0.65rem;
  color: var(--color-heading);
}
.project-description {
  font-size: 1.02rem;
  color: var(--color-text);
  line-height: 1.78;
  margin-bottom: 1.15rem;
}
.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
}
.project-tags .tag {
  background-color: var(--color-light);
  color: var(--color-text);
  border: none;
  border-radius: 999px;
  padding: 0.28rem 0.82rem;
  font-family: var(--font-meta);
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0;
  text-transform: none;
}

.projects-more {
  text-align: center;
  margin-top: 3rem;
}

/* ===== ボタン ===== */
.btn {
  display: inline-block;
  border-radius: 999px;
  font-family: var(--font-meta);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0;
  text-transform: none;
  padding: 0.65rem 1.2rem;
  border: 1px solid var(--color-heading);
  transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}
.btn-secondary {
  background-color: transparent;
  color: var(--color-heading);
  border-color: var(--color-line-strong);
}
.btn-secondary:hover {
  background-color: var(--color-heading);
  color: var(--color-bg);
  border-color: var(--color-heading);
}
.btn-primary {
  background-color: var(--color-heading);
  color: var(--color-bg);
  border-color: var(--color-heading);
}
.btn-primary:hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-white);
}
.project-content .btn { margin-right: 0.5rem; margin-bottom: 0.5rem; }

/* ===== Achievements ===== */
.achievements-content { display: grid; gap: 3.5rem; }
.achievements-category h3 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.35rem;
  letter-spacing: -0.005em;
  text-transform: none;
  color: var(--color-heading);
  margin-bottom: 1.35rem;
}
.achievements-list { display: flex; flex-direction: column; }
.achievement-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 1.25rem;
  align-items: start;
  padding: 1.25rem 0;
  border-top: 1px solid var(--color-line);
  background: transparent;
  box-shadow: none;
}
.achievement-item:last-child { border-bottom: 1px solid var(--color-line); }
.achievement-icon {
  width: 36px;
  height: 36px;
  background: transparent;
  color: var(--color-accent);
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-line);
  border-radius: 50%;
}
.achievement-details h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.25rem;
  line-height: 1.5;
  margin-bottom: 0.5rem;
  letter-spacing: -0.005em;
}
.achievement-date {
  font-family: var(--font-meta);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0;
  text-transform: none;
  color: var(--color-text-light);
  margin-right: 0.5rem;
}
.achievement-details p {
  font-size: 1.08rem;
  color: var(--color-text);
  line-height: 1.78;
  margin: 0.25rem 0;
}

/* ===== Resume ===== */
.resume-content { display: grid; gap: 3.5rem; }
.resume-section > h3 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.35rem;
  letter-spacing: -0.005em;
  text-transform: none;
  color: var(--color-heading);
  margin-bottom: 1.35rem;
}
.resume-items { display: flex; flex-direction: column; }
.resume-item {
  padding: 1.5rem 0;
  background: transparent;
  border-top: 1px solid var(--color-line);
  box-shadow: none;
  border-radius: 0;
}
.resume-item:last-child { border-bottom: 1px solid var(--color-line); }
.resume-item-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.55rem;
}
.resume-item-header h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.25rem;
  margin: 0;
  letter-spacing: -0.005em;
}
.resume-date {
  font-family: var(--font-meta);
  font-size: 1rem;
  letter-spacing: 0;
  text-transform: none;
  color: var(--color-text-light);
}
.resume-item-body p,
.resume-item-body li {
  font-size: 1.08rem;
  color: var(--color-text);
  line-height: 1.78;
}
.resume-item-body ul { padding-left: 1.25rem; }

/* ===== Contact ===== */
.contact-content { padding-top: 0.5rem; }
.contact-info h3 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.35rem;
  letter-spacing: -0.005em;
  text-transform: none;
  color: var(--color-heading);
  margin-bottom: 1.15rem;
}
.social-links { display: flex; gap: 0.75rem; }
.social-link {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: transparent;
  color: var(--color-heading);
  border: 1px solid var(--color-line);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: background-color 0.25s ease, color 0.25s ease, transform 0.25s ease;
}
.social-link:hover {
  background-color: var(--color-heading);
  color: var(--color-bg);
  transform: translateY(-2px);
}

/* ===== Footer ===== */
.footer {
  background-color: var(--color-bg);
  color: var(--color-text-light);
  padding: 3rem 0 2rem;
  border-top: 1px solid var(--color-line);
}
.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.footer-copyright p {
  font-family: var(--font-meta);
  font-size: 0.82rem;
  letter-spacing: 0;
  color: var(--color-text-light);
  margin: 0;
}
.footer-links { display: flex; gap: 1.5rem; flex-wrap: wrap; }
.footer-links a {
  font-family: var(--font-meta);
  font-size: 0.82rem;
  letter-spacing: 0;
  text-transform: none;
  color: var(--color-text-light);
}
.footer-links a:hover { color: var(--color-heading); }

/* ===== Project Detail Page ===== */
.project-detail-hero,
.project-hero,
.project-detail-section {
  background-color: var(--color-bg);
}
.project-detail-title {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--color-heading);
}
.project-embedded-content h3,
.project-additional-images h3,
.project-detail-section h3 {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-light);
}

/* ============================================================ */
/* ===== Motion / Interaction Layer ===== */
/* ============================================================ */

/* ----- マスクリビール: 1行を overflow:hidden、内側を translateY(110%) ----- */
.mask {
  display: inline-block;
  overflow: hidden;
  vertical-align: top;
  line-height: inherit;
}
.mask > .mask-inner {
  display: inline-block;
  transform: translateY(110%);
  transition: transform 900ms cubic-bezier(0.22, 1, 0.36, 1);
  will-change: transform;
}
.mask.is-visible > .mask-inner,
.is-visible .mask > .mask-inner,
.is-visible.mask > .mask-inner {
  transform: translateY(0);
}

/* hero-name の1行をマスク表示 */
.hero-name {
  display: block;
  overflow: hidden;
  line-height: 1.05;
}
.hero-name .mask-inner {
  display: inline-block;
  transform: translateY(110%);
  transition: transform 1100ms cubic-bezier(0.22, 1, 0.36, 1) 100ms;
}
.hero-name.is-visible .mask-inner { transform: translateY(0); }

/* hero-eyebrow / hero-lede / hero-jp はフェード+ライト・アップ */
.hero-eyebrow,
.hero-lede,
.hero-jp,
.hero-meta,
.hero-portrait,
.hero-scroll {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 800ms cubic-bezier(0.22, 1, 0.36, 1),
              transform 800ms cubic-bezier(0.22, 1, 0.36, 1);
}
.hero-eyebrow { transition-delay: 200ms; }
.hero-name   { transition-delay: 100ms; }
.hero-lede   { transition-delay: 500ms; }
.hero-jp     { transition-delay: 650ms; }
.hero-meta   { transition-delay: 0ms; }
.hero-portrait { transition-delay: 350ms; }
.hero-scroll { transition-delay: 900ms; }
.hero.is-loaded .hero-eyebrow,
.hero.is-loaded .hero-lede,
.hero.is-loaded .hero-jp,
.hero.is-loaded .hero-meta,
.hero.is-loaded .hero-portrait,
.hero.is-loaded .hero-scroll {
  opacity: 1;
  transform: translateY(0);
}

/* hero-portrait に画像ワイプ(暗いブラインドが上に消える) */
.hero-portrait {
  position: relative;
}
.hero-portrait::after {
  content: "";
  position: absolute;
  inset: 0;
  background-color: var(--color-heading);
  transform-origin: top;
  transform: scaleY(1);
  transition: transform 1200ms cubic-bezier(0.76, 0, 0.24, 1) 400ms;
  pointer-events: none;
  z-index: 1;
}
.hero.is-loaded .hero-portrait::after {
  transform: scaleY(0);
  transform-origin: bottom;
}

/* ----- セクション見出しのマスクリビール ----- */
/* reveal の opacity/transform より mask 演出を優先 */
.section-title.reveal { opacity: 1; transform: none; }
.section-title {
  overflow: visible;
}
.section-title::before {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 600ms ease, transform 600ms cubic-bezier(0.22, 1, 0.36, 1);
}
.section-title.is-visible::before {
  opacity: 1;
  transform: translateY(0);
}
.section-title .mask-inner {
  display: inline-block;
  transform: translateY(110%);
  transition: transform 900ms cubic-bezier(0.22, 1, 0.36, 1) 150ms;
}
.section-title.is-visible .mask-inner { transform: translateY(0); }

/* ----- ナビホバー: シンプルな下線アンダーラインドロー ----- */
.nav-link .nav-link-text {
  display: inline-block;
  transform: none !important;
  transition: none;
}
.nav-link .nav-link-text::after { content: none; display: none; }

/* ----- ボタンのスライド系ホバー ----- */
.btn {
  position: relative;
  overflow: hidden;
  isolation: isolate;
}
.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background-color: var(--color-heading);
  transform: translateY(101%);
  transition: transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
  z-index: -1;
}
.btn-primary::before { background-color: var(--color-accent); }
.btn:hover::before { transform: translateY(0); }
.btn-secondary:hover { color: var(--color-bg); border-color: var(--color-heading); background-color: transparent; }
.btn-primary:hover  { color: var(--color-white); background-color: var(--color-heading); }

/* ----- プロジェクトカードの拡張ホバー ----- */
.project-image {
  position: relative;
}
.project-image::after {
  content: attr(data-hover);
  position: absolute;
  left: 1rem;
  right: 1rem;
  bottom: 1rem;
  font-family: var(--font-meta);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-bg);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.4s ease 0.05s, transform 0.5s cubic-bezier(0.22, 1, 0.36, 1) 0.05s;
  pointer-events: none;
  z-index: 2;
}
.project-image::before {
  content: "";
  position: absolute;
  inset: 0;
  background-color: rgba(12, 13, 16, 0);
  transition: background-color 0.4s ease;
  z-index: 1;
}
.project-card:hover .project-image::before { background-color: rgba(12, 13, 16, 0.35); }
.project-card:hover .project-image::after { opacity: 1; transform: translateY(0); }

/* ----- セクションナンバーカウント風 ----- */
.section-title::before {
  display: inline-block;
}

/* ----- prefers-reduced-motion ----- */
@media (prefers-reduced-motion: reduce) {
  .mask > .mask-inner,
  .hero-name .mask-inner,
  .section-title .mask-inner,
  .nav-link .nav-link-text,
  .btn::before,
  .hero-portrait::after,
  .project-image::after,
  .project-image::before {
    transition: none !important;
    transform: none !important;
  }
  .hero-eyebrow,
  .hero-lede,
  .hero-jp,
  .hero-meta,
  .hero-portrait,
  .hero-scroll { opacity: 1 !important; transform: none !important; }
  .hero-portrait::after { display: none; }
}

/* ===== レスポンシブ ===== */
@media (max-width: 900px) {
  section { padding: var(--section-spacing-mobile) 0; }
  .section-title { margin-bottom: 2.25rem; }
  .about-content { grid-template-columns: 1fr; gap: 2rem; }
  .skills-container { grid-template-columns: 1fr; gap: 1.5rem; }
  .timeline-item { grid-template-columns: 1fr; gap: 0.4rem; }
  .timeline { margin-top: 3.5rem; padding-top: 2.25rem; }
  .skills { margin-top: 3.5rem; padding-top: 2.25rem; }
  .achievement-item { grid-template-columns: 36px 1fr; gap: 0.85rem; }
  .hero-grid { grid-template-columns: 1fr; gap: 2rem; padding: 2rem 0; }
  .hero-portrait { order: -1; }
  .hero-portrait img { max-height: 50vh; aspect-ratio: 1 / 1; object-position: 35% 32%; }
  .hero-name { font-size: clamp(2rem, 9vw, 3rem); }
  .hero-meta { font-size: 0.65rem; letter-spacing: 0.14em; }
  .nav-menu { gap: 1.25rem; }
}

@media (max-width: 600px) {
  .projects-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .filter-btn { margin-right: 1.25rem; font-size: 0.82rem; }
  .footer-content { flex-direction: column; align-items: flex-start; gap: 1rem; }
  .resume-item-header { flex-direction: column; }
  .about-details { grid-template-columns: 1fr; }
}