/* ======================================================================
   SHONO TAIRA Portfolio - デジタル庁風デザイン
   - デジタル庁サイト（https://www.digital.go.jp/）のデザインを忠実に再現
   - シンプルで洗練されたデザイン
   - 高いアクセシビリティ
   - 12カラムグリッドシステム
   ====================================================================== */

/* ------------------------------------------------------------
   Reset & Base
   ------------------------------------------------------------ */
:root {
  /* デジタル庁風カラーパレット */
  --color-primary: #2D654F;
  /* プライマリーカラー */
  --color-primary-hover: #1e4a37;
  --color-primary-active: #0f2a1c;
  --color-secondary: #333333;
  /* テキストカラー */
  --color-accent: #FFD43D;
  /* アクセントカラー（フォーカス時） */
  --color-bg: #ffffff;
  /* 背景色 */
  --color-bg-light: #F5F7FD;
  /* 薄い背景色 */
  --color-border: #E5E7EB;
  /* ボーダー色 */
  --color-text: #333333;
  /* テキスト色 */
  --color-text-light: #666666;
  /* 薄いテキスト色 */
  --color-link: #2D654F;
  /* リンク色 */
  --color-link-hover: #2D654F;
  /* リンクホバー色 */
  --color-success: #197A4B;
  /* 成功色 */
  --color-warning: #E25100;
  /* 警告色 */
  --color-error: #EC0000;
  /* エラー色 */

  /* フォント定義 */
  --font-primary: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "BIZ UDPGothic", "Meiryo", sans-serif;
  --font-secondary: "Noto Sans", sans-serif;
  --font-mono: "Noto Sans Mono", monospace;

  /* フォントサイズ */
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;

  /* スペーシング - デジタル庁風に調整 */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 5rem;
  --spacing-5xl: 6rem;
  --spacing-6xl: 8rem;

  /* レイアウト */
  --header-height: 4.5rem;
  --container-width: 77.375rem;
  /* 1238px */
  --section-gap: 6rem;
  --section-gap-sp: 4rem;

  /* アニメーション */
  --transition-fast: 0.15s;
  --transition-normal: 0.3s;
  --transition-slow: 0.5s;

  /* その他 */
  --border-radius: 0.5rem;
  --box-shadow: 0 0.25rem 0.25rem 0 rgba(0, 0, 0, 0.16), 0 0.0625rem 0.3125rem 0 rgba(0, 0, 0, 0.3);
  --focus-ring: 0 0 0 0.125rem var(--color-accent);
}

/* リセットCSS */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-primary);
  font-size: 1.0625rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* スマホでの横スクロール完全防止 */
@media (max-width: 768px) {
  html {
    overflow-x: hidden;
    width: 100%;
  }
  
  body {
    overflow-x: hidden;
    width: 100%;
    position: relative;
  }
}

img {
  max-width: 100%;
  height: auto;
  vertical-align: bottom;
}

a {
  color: var(--color-link);
  text-decoration: underline;
  text-underline-offset: 0.1875rem;
  transition: all var(--transition-fast) ease-in-out;
}

a:hover {
  color: var(--color-link-hover);
  text-decoration-thickness: 0.1875rem;
}

a:focus-visible {
  outline: 4px solid #000;
  outline-offset: 0.125rem;
  background-color: var(--color-accent);
  color: var(--color-link);
  border-radius: 0.25rem;
}

a:active {
  color: var(--color-warning);
  text-decoration-thickness: 1px;
}

ul,
ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  color: inherit;
}

button:focus-visible {
  outline: 4px solid #000;
  outline-offset: 0.125rem;
  background-color: var(--color-accent);
}

/* ------------------------------------------------------------
   Layout & Grid System
   ------------------------------------------------------------ */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1.5rem;
}

.col-1 {
  grid-column: span 1;
}

.col-2 {
  grid-column: span 2;
}

.col-3 {
  grid-column: span 3;
}

.col-4 {
  grid-column: span 4;
}

.col-5 {
  grid-column: span 5;
}

.col-6 {
  grid-column: span 6;
}

.col-7 {
  grid-column: span 7;
}

.col-8 {
  grid-column: span 8;
}

.col-9 {
  grid-column: span 9;
}

.col-10 {
  grid-column: span 10;
}

.col-11 {
  grid-column: span 11;
}

.col-12 {
  grid-column: span 12;
}

.section {
  padding-block: var(--section-gap);
  margin-bottom: 0;
}

.section:first-of-type {
  padding-top: 0;
}

.section-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
  width: 100%;
}

/* ------------------------------------------------------------
   Typography - デジタル庁風に調整
   ------------------------------------------------------------ */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.4;
  margin-bottom: 0;
  color: var(--color-text);
}

h1 {
  font-size: var(--font-size-5xl);
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.3;
  margin-bottom: var(--spacing-xl);
}

h2 {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.3;
  margin-bottom: var(--spacing-2xl);
}

h3 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.4;
  margin-bottom: var(--spacing-lg);
}

h4 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.4;
  margin-bottom: var(--spacing-md);
}

h5 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.5;
  margin-bottom: var(--spacing-sm);
}

h6 {
  font-size: var(--font-size-base);
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.5;
  margin-bottom: var(--spacing-sm);
}

p {
  margin-bottom: var(--spacing-lg);
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.8;
  color: var(--color-text);
}

/* リード文 */
.lead {
  font-size: 1.125rem;
  font-weight: 400;
  line-height: 1.8;
  margin-bottom: var(--spacing-2xl);
  color: var(--color-text);
}

/* セクション間の余白調整 */
.section + .section {
  border-top: 1px solid rgba(229, 231, 235, 0.3);
}

/* ------------------------------------------------------------
   Animations & Effects
   ------------------------------------------------------------ */

/* Subtle hover effects for interactive elements */
.skill-item,
.ai-consulting-card,
.work-card {
  position: relative;
  overflow: hidden;
}

.skill-item::before,
.ai-consulting-card::before,
.work-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(45, 101, 79, 0.05), transparent);
  transition: left 0.6s ease-in-out;
  z-index: 1;
}

.skill-item:hover::before,
.ai-consulting-card:hover::before,
.work-card:hover::before {
  left: 100%;
}

/* Floating animation for profile image */
@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-10px);
  }
}

.profile-image img {
  animation: float 6s ease-in-out infinite;
}

/* Subtle parallax effect for section headers */
.section-header__ttl {
  position: relative;
}

/* .section-header__ttl::after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: width 0.8s ease-out;
} */

.section-header__ttl.in-view::after {
  width: 60px;
}

/* Staggered fade-in animation */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.fade-in.in-view {
  opacity: 1;
  transform: translateY(0);
}

.fade-in:nth-child(1) { transition-delay: 0.1s; }
.fade-in:nth-child(2) { transition-delay: 0.2s; }
.fade-in:nth-child(3) { transition-delay: 0.3s; }
.fade-in:nth-child(4) { transition-delay: 0.4s; }
.fade-in:nth-child(5) { transition-delay: 0.5s; }

/* Skill progress bar animation */
.skill-progress {
  width: 0 !important;
  transition: width 1.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.skill-item.animate .skill-progress[style*="95%"] { width: 95% !important; }
.skill-item.animate .skill-progress[style*="90%"] { width: 90% !important; }
.skill-item.animate .skill-progress[style*="75%"] { width: 75% !important; }
.skill-item.animate .skill-progress[style*="70%"] { width: 70% !important; }
.skill-item.animate .skill-progress[style*="60%"] { width: 60% !important; }
.skill-item.animate .skill-progress[style*="40%"] { width: 40% !important; }
.skill-item.animate .skill-progress[style*="30%"] { width: 30% !important; }

/* Subtle glow effect for buttons */
.button,
.contact-button {
  position: relative;
  overflow: hidden;
}

.button::before,
.contact-button::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.3) 0%, transparent 70%);
  transition: all 0.6s ease-out;
  transform: translate(-50%, -50%);
  border-radius: 50%;
}

.button:hover::before,
.contact-button:hover::before {
  width: 300px;
  height: 300px;
}

/* Typewriter effect for main title */
@keyframes typewriter {
  from { width: 0; }
  to { width: 100%; }
}

@keyframes blink {
  50% { border-color: transparent; }
}

.kv__ttl.main {
  position: relative;
  overflow: hidden;
  white-space: nowrap;
  border-right: 2px solid var(--color-primary);
  animation: typewriter 2s steps(20) 1s both, blink 1s step-end infinite;
}

/* スマホでタイプライター効果を無効化 */
@media (max-width: 768px) {
  .kv__ttl.main {
    white-space: normal;
    border-right: none;
    animation: none;
    overflow: visible;
  }
}

/* Smooth scroll indicator pulse */
@keyframes pulse {
  0%, 100% {
    opacity: 0.6;
    transform: translateX(-50%) scale(1);
  }
  50% {
    opacity: 1;
    transform: translateX(-50%) scale(1.05);
  }
}

.scroll-indicator {
  animation: pulse 2s ease-in-out infinite;
}

/* ------------------------------------------------------------
   Components
   ------------------------------------------------------------ */

/* Button */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  min-width: 6rem;
  padding: 0.5rem 1rem;
  border: 4px double transparent;
  border-radius: var(--border-radius);
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1;
  text-decoration: none;
  text-underline-offset: 0.1875rem;
  transition: all var(--transition-fast) ease-in-out;
  cursor: pointer;
}

.button:hover {
  background-color: var(--color-primary-hover);
  color: #ffffff;
  text-decoration: underline;
}

.button:focus-visible {
  outline: 4px solid #000;
  outline-offset: 0.125rem;
  box-shadow: var(--focus-ring);
}

.button:active {
  background-color: var(--color-primary-active);
  color: #ffffff;
  text-decoration: underline;
}

/* Card */
.card {
  display: grid;
  height: 100%;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: 1.5rem;
  background-color: var(--color-bg);
  transition: all var(--transition-fast) ease-in-out;
}

.card:hover {
  outline: 4px solid var(--color-primary);
  outline-offset: -1px;
}

.card:focus-visible {
  outline: 4px solid #000;
  outline-offset: 0.125rem;
  box-shadow: var(--focus-ring);
}

/* ------------------------------------------------------------
   Header
   ------------------------------------------------------------ */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(0.5rem);
  -webkit-backdrop-filter: blur(0.5rem);
}

.header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(0.5rem);
  -webkit-backdrop-filter: blur(0.5rem);
  z-index: -1;
}

.header-inner {
  display: flex;
  position: relative;
  justify-content: space-between;
  align-items: center;
  max-width: 90rem;
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  width: 100%;
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.header-logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-text);
  text-decoration: none;
  padding: 1rem 0.5rem;
  border-radius: 0.25rem;
  margin-left: -0.5rem;
  margin-bottom: 0;
}

.header-logo:hover {
  color: var(--color-text);
  text-decoration: none;
}

.header-logo:focus-visible {
  outline: 4px solid #000;
  outline-offset: 0.125rem;
  background-color: var(--color-accent);
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.header-nav ul {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.header-nav li {
  display: flex;
}

.nav-link {
  display: flex;
  align-items: center;
  min-height: 2rem;
  padding: 0.5rem;
  border-radius: calc(infinity * 1rem);
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1;
  text-align: center;
  text-wrap: nowrap;
  color: var(--color-text);
  text-decoration: none;
  transition: all var(--transition-fast) ease-in-out;
}

.nav-link:hover {
  outline: 1px dashed #000;
  border-radius: 624.9375rem;
  color: var(--color-text);
  text-decoration: none;
}

.nav-link:focus-visible {
  outline: 4px solid #000;
  outline-offset: 0.125rem;
  background-color: var(--color-accent);
}

.nav-link.is-active {
  font-weight: 800;
  outline: 1px solid;
}

.nav-link.is-active:focus-visible {
  outline-width: 4px;
}

/* Header Social Links */
.header-social {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-left: var(--spacing-md);
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: calc(infinity * 1rem);
  border: 2px solid transparent;
  text-decoration: none;
  transition: all var(--transition-fast) ease-in-out;
  padding: 0.25rem;
}

/* ヘッダー専用のソーシャルリンクサイズ調整 */
.header-social .social-link {
  width: 2rem;
  height: 2rem;
  padding: 0.125rem;
}

.social-link img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: all var(--transition-fast) ease-in-out;
}

.social-link:hover {
  border: 2px dashed var(--color-primary);
  border-radius: 624.9375rem;
  text-decoration: none;
  transform: translateY(-2px);
}

.social-link:focus-visible {
  outline: 4px solid #000;
  outline-offset: 0.125rem;
  background-color: var(--color-accent);
}

/* Menu Button */
.menu-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 2rem;
  height: 2rem;
  padding: 0.5rem;
  border-radius: calc(infinity * 1rem);
  background: none;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast) ease-in-out;
}

.menu-btn:hover {
  outline: 1px dashed #000;
  border-radius: 624.9375rem;
}

.menu-btn:focus-visible {
  outline: 4px solid #000;
  outline-offset: 0.125rem;
  background-color: var(--color-accent);
}

.menu-btn span {
  display: block;
  width: 1rem;
  height: 0.125rem;
  background-color: var(--color-text);
  transition: all var(--transition-fast) ease-in-out;
}

.menu-btn span:nth-child(2) {
  margin: 0.1875rem 0;
}

.menu-btn.is-active span:nth-child(1) {
  transform: rotate(45deg) translate(0.1875rem, 0.1875rem);
}

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

.menu-btn.is-active span:nth-child(3) {
  transform: rotate(-45deg) translate(0.1875rem, -0.1875rem);
}

/* ------------------------------------------------------------
   Main Visual (KV)
   ------------------------------------------------------------ */
.kv {
  position: relative;
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.kv__ttl-container {
  position: relative;
  z-index: 2;
  text-align: left;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

.kv__ttl-container-inner {
  margin: 0;
}

.kv__ttl.main {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.4;
  margin-bottom: var(--spacing-lg);
}

.kv__ttl.sub {
  font-size: clamp(1rem, 2vw, 1.25rem);
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.7;
  margin-bottom: 0;
}

.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.875rem;
  letter-spacing: 0.1em;
  z-index: 2;
}

.scroll-arrow {
  width: 1px;
  height: 2rem;
  background-color: rgba(255, 255, 255, 0.6);
  margin-top: 0.5rem;
  position: relative;
  animation: scroll-arrow 2s infinite;
}

.scroll-arrow::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: -3px;
  width: 7px;
  height: 7px;
  border-right: 1px solid rgba(255, 255, 255, 0.6);
  border-bottom: 1px solid rgba(255, 255, 255, 0.6);
  transform: rotate(45deg);
}

@keyframes scroll-arrow {

  0%,
  100% {
    opacity: 0.6;
  }

  50% {
    opacity: 1;
  }
}

/* ------------------------------------------------------------
   Sections
   ------------------------------------------------------------ */
.section-header {
  margin-bottom: var(--spacing-5xl);
  text-align: left;
}

.section-header__ttl {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--spacing-sm);
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.3;
  color: var(--color-text);
  margin-bottom: 0;
}

.section-header__ttl .ja {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.3;
  margin-bottom: 0;
}

.section-header__ttl .en {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  line-height: 1;
  color: var(--color-text-light);
  text-transform: uppercase;
}

.section-header.divider {
  position: relative;
  padding-bottom: var(--spacing-2xl);
}

.section-header.divider::after {
  content: "";
  position: absolute;
  bottom: var(--spacing-xl);
  left: 0;
  width: 60px;
  height: 2px;
  background-color: var(--color-primary);
}

.section-body {
  margin-top: 0;
}

/* ------------------------------------------------------------
   Skills Section
   ------------------------------------------------------------ */
.skills {
  background-color: var(--color-bg);
}

.skills-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-6xl);
}

.skill-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2xl);
}

.skill-group-title {
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.4;
  color: var(--color-text);
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  text-align: left;
}

.skill-group-items {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  align-items: start;
}

.skill-category {
  opacity: 0;
  transform: translateY(2rem);
  transition: all var(--transition-slow) ease-out;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.skill-category.fade-in {
  opacity: 1;
  transform: translateY(0);
}

.skill-category__title {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.4;
  color: var(--color-text);
  margin-bottom: var(--spacing-2xl);
}

.skill-category__title .icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 0.5rem;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 1rem;
}

.skill-list {
  display: grid;
  gap: var(--spacing-md);
  flex: 1;
}

.skill-item {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  background-color: var(--color-bg);
  transition: all var(--transition-fast) ease-in-out;
}

.skill-item:hover {
  outline: 4px solid var(--color-primary);
  outline-offset: -1px;
}

.skill-name {
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  line-height: 1.7;
  color: var(--color-text);
}

.skill-bar {
  width: 200px;
  height: 0.5rem;
  background-color: var(--color-bg-light);
  border-radius: 0.25rem;
  overflow: hidden;
  position: relative;
}

.skill-progress {
  height: 100%;
  background-color: var(--color-primary);
  border-radius: 0.25rem;
  transition: width 1s ease-out;
}

.skill-year {
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1;
  color: var(--color-text-light);
  white-space: nowrap;
}

/* ------------------------------------------------------------
   AI Consulting Section
   ------------------------------------------------------------ */
.ai-consulting {
  background-color: var(--color-bg-light);
}

.ai-consulting-intro {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--spacing-3xl);
  align-items: center;
  margin-bottom: var(--spacing-4xl);
  padding: var(--spacing-3xl);
  background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
  border-radius: 2rem;
  border: 1px solid var(--color-border);
}

.ai-consulting-intro__content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.ai-consulting-lead {
  margin-bottom: var(--spacing-xl);
}

.ai-consulting-lead p {
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: 0;
}

.ai-consulting-qualification {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.qualification-title {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.5;
  color: var(--color-text);
  margin-bottom: 0;
}

.qualification-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: linear-gradient(135deg, var(--color-primary) 0%, #1e4a37 100%);
  border-radius: 1rem;
  color: #ffffff;
  position: relative;
  overflow: hidden;
}

.qualification-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, rgba(255, 255, 255, 0.1) 0%, transparent 100%);
  pointer-events: none;
}

.qualification-item .qualification-name,
.qualification-item .qualification-date {
  color: #ffffff;
  position: relative;
  z-index: 1;
}

.qualification-name {
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  line-height: 1.7;
  color: var(--color-text);
}

.qualification-date {
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1;
  color: var(--color-text-light);
}

.ai-consulting-intro__logo {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 200px;
}

.passport-logo-area {
  text-align: center;
}

.passport-logo-area figure {
  margin: 0;
}

.passport-logo-area img {
  max-width: 150px;
  height: auto;
}

.passport-logo-area figcaption {
  font-size: 0.75rem;
  color: var(--color-text-light);
  margin-top: var(--spacing-sm);
}

.section-body__sub-ttl {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.4;
  color: var(--color-text);
  margin-bottom: var(--spacing-3xl);
  text-align: left;
}

.ai-consulting-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.ai-consulting-card {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  padding: var(--spacing-xl);
  border: 1px solid var(--color-border);
  border-radius: 1.5rem;
  background-color: var(--color-bg);
  transition: all var(--transition-fast) ease-in-out;
  opacity: 0;
  transform: translateY(2rem);
}

.ai-consulting-card.fade-in {
  opacity: 1;
  transform: translateY(0);
}

.ai-consulting-card:hover {
  outline: 4px solid var(--color-primary);
  outline-offset: -1px;
}

.ai-consulting-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: 0.75rem;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 1.5rem;
}

.ai-consulting-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.5;
  color: var(--color-text);
  margin-bottom: 0;
}

.ai-consulting-card__description {
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 0;
}

/* ------------------------------------------------------------
   Works Section
   ------------------------------------------------------------ */
.works {
  background-color: var(--color-bg);
}

.works-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-xl);
}

.work-card {
  display: grid;
  grid-template-rows: min-content 1fr;
  height: 100%;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: 1.5rem;
  background-color: var(--color-bg);
  transition: all var(--transition-fast) ease-in-out;
  opacity: 0;
  transform: translateY(2rem);
}

.work-card.fade-in {
  opacity: 1;
  transform: translateY(0);
}

.work-card:hover {
  outline: 4px solid var(--color-primary);
  outline-offset: -1px;
}

.work-card__img {
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
}

.work-card__img img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform var(--transition-fast) ease-in-out;
}

.work-card:hover .work-card__img img {
  transform: scale(1.05);
}

.work-card__content {
  display: grid;
  grid-template-columns: 1fr 24px;
  grid-template-rows: min-content min-content 1fr min-content;
  gap: var(--spacing-md);
  padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-lg) var(--spacing-xl);
}

.work-card__title {
  grid-column: span 2;
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.5;
  color: var(--color-text);
  margin-bottom: 0;
}

.work-card__meta {
  grid-column: span 2;
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.work-card__tag {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  background-color: var(--color-bg-light);
  color: var(--color-text);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  line-height: 1;
}

.work-card__description {
  grid-column: span 2;
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 0;
}

.work-card__link {
  grid-column: span 2;
  margin-top: auto;
}

.work-link {
  word-break: break-all;
  overflow-wrap: break-word;
  hyphens: auto;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.3;
  color: var(--color-link);
  text-decoration: underline;
  text-underline-offset: 0.1875rem;
}

.work-link:hover {
  color: var(--color-link-hover);
  text-decoration-thickness: 0.1875rem;
}

.work-link:focus-visible {
  outline: 4px solid #000;
  outline-offset: 0.125rem;
  background-color: var(--color-accent);
  color: var(--color-link);
  border-radius: 0.25rem;
}

.work-link:active {
  color: var(--color-warning);
  text-decoration-thickness: 1px;
}

/* ------------------------------------------------------------
   Profile Section
   ------------------------------------------------------------ */
.profile {
  background-color: var(--color-bg-light);
}

.profile-container {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: var(--spacing-4xl);
  align-items: start;
}

.profile-image {
  opacity: 0;
  transform: translateY(2rem);
  transition: all var(--transition-slow) ease-out;
}

.profile-image.fade-in {
  opacity: 1;
  transform: translateY(0);
}

.profile-image img {
  width: 100%;
  height: auto;
  aspect-ratio: 3/4;
  object-fit: cover;
  border-radius: 1.5rem;
  border: 1px solid var(--color-border);
}

.profile-content {
  opacity: 0;
  transform: translateY(2rem);
  transition: all var(--transition-slow) ease-out;
}

.profile-content.fade-in {
  opacity: 1;
  transform: translateY(0);
}

.profile-name {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.5;
  color: var(--color-text);
  margin-bottom: var(--spacing-lg);
}

.profile-name-en {
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1;
  color: var(--color-text-light);
  margin-left: var(--spacing-md);
}

.profile-data {
  display: grid;
  grid-template-columns: 8rem auto;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xl);
}

.profile-data-item {
  display: contents;
}

.profile-data dt {
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  line-height: 1;
  color: var(--color-text-light);
  padding: var(--spacing-sm) 0;
}

.profile-data dd {
  font-size: 1.0625rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.7;
  color: var(--color-text);
  padding: var(--spacing-sm) 0;
}

.profile-text {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.profile-text p {
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.7;
  color: var(--color-text);
}

.profile-strength-title {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.5;
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
}

.profile-qualification {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.qualification-badge {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  background-color: var(--color-bg);
}

.qualification-name.--white {
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  line-height: 1.7;
  color: var(--color-text);
}

.qualification-date.--white {
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1;
  color: var(--color-text-light);
}

.profile-strength-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  list-style: disc;
  padding-left: var(--spacing-xl);
}

.profile-strength-list li {
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.7;
  color: var(--color-text);
}

/* ------------------------------------------------------------
   Contact Section
   ------------------------------------------------------------ */
.contact {
  background-color: var(--color-bg);
}

.contact-message {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
  opacity: 0;
  transform: translateY(2rem);
  transition: all var(--transition-slow) ease-out;
}

.contact-message.fade-in {
  opacity: 1;
  transform: translateY(0);
}

.contact-message p {
  font-size: 1.125rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.7;
  color: var(--color-text);
}

.contact-button-container {
  display: flex;
  justify-content: center;
  opacity: 0;
  transform: translateY(2rem);
  transition: all var(--transition-slow) ease-out;
}

.contact-button-container.fade-in {
  opacity: 1;
  transform: translateY(0);
}

.contact-button {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-md);
  min-height: 4rem;
  padding: var(--spacing-lg) var(--spacing-2xl);
  border: 4px double transparent;
  border-radius: var(--border-radius);
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1;
  text-decoration: none;
  text-underline-offset: 0.1875rem;
  transition: all var(--transition-fast) ease-in-out;
}

.contact-button:hover {
  background-color: var(--color-primary-hover);
  color: #ffffff;
  text-decoration: underline;
}

.contact-button:focus-visible {
  outline: 4px solid #000;
  outline-offset: 0.125rem;
  box-shadow: var(--focus-ring);
}

.contact-button:active {
  background-color: var(--color-primary-active);
  color: #ffffff;
  text-decoration: underline;
}

.contact-button-icon {
  display: flex;
  align-items: center;
  font-size: 1rem;
}

/* ------------------------------------------------------------
   Footer
   ------------------------------------------------------------ */
.footer {
  margin-top: auto;
  background-color: var(--color-bg);
  border-top: 1px solid var(--color-border);
}

.footer::after {
  content: "";
  display: block;
  height: 12rem;
  margin-top: var(--spacing-3xl);
  background: linear-gradient(180deg, 
    #ffffff 0%, 
    #f8faf9 15%, 
    #e8f2ed 30%, 
    #d1e7dd 45%, 
    #a3d2b7 60%, 
    #6bb88a 75%, 
    #2d654f 90%, 
    #1e4a37 100%
  );
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: -50%;
  width: 200%;
  height: 12rem;
  background: linear-gradient(45deg, 
    transparent 30%, 
    rgba(255, 255, 255, 0.15) 50%, 
    transparent 70%
  );
  animation: shimmer 4s ease-in-out infinite;
  pointer-events: none;
  z-index: 1;
}

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

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--spacing-3xl) 1.5rem;
  width: 100%;
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: var(--spacing-xl);
  align-items: center;
}

.footer-copyright {
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.7;
  color: var(--color-text);
}

.footer-nav ul {
  display: flex;
  gap: var(--spacing-lg);
}

.footer-nav a {
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1;
  color: var(--color-link);
  text-decoration: underline;
  text-underline-offset: 0.1875rem;
  padding: 0.125rem;
  margin: -0.125rem;
}

.footer-nav a:hover {
  color: var(--color-link-hover);
  text-decoration-thickness: 0.1875rem;
}

.footer-nav a:focus-visible {
  outline: 4px solid #000;
  outline-offset: 0.125rem;
  background-color: var(--color-accent);
  color: var(--color-link);
  border-radius: 0.25rem;
}

.footer-nav a:active {
  color: var(--color-warning);
  text-decoration-thickness: 1px;
}

/* Footer Social Links */
.footer-social {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.footer-social .social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  border: 2px solid transparent;
  background-color: var(--color-bg-light);
  text-decoration: none;
  transition: all var(--transition-fast) ease-in-out;
  padding: 0.5rem;
}

.footer-social .social-link img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: all var(--transition-fast) ease-in-out;
}

.footer-social .social-link:hover {
  border: 2px dashed var(--color-primary);
  background-color: var(--color-bg-light);
  text-decoration: none;
  transform: translateY(-2px);
}

.footer-social .social-link:focus-visible {
  outline: 4px solid #000;
  outline-offset: 0.125rem;
  background-color: var(--color-accent);
}

/* ------------------------------------------------------------
   Visit Message - チャットアプリ風UI
   ------------------------------------------------------------ */
.visit-message {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  max-width: 320px;
  z-index: 1000;
  opacity: 0;
  transform: translateY(2rem) scale(0.95);
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  padding-bottom: var(--spacing-md);
}

.visit-message.show {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.visit-message-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  background: linear-gradient(135deg, var(--color-primary) 0%, #1e4a37 100%);
  color: #ffffff;
  border-radius: 1.5rem 1.5rem 0.5rem 0.5rem;
  box-shadow: 0 4px 16px rgba(45, 101, 79, 0.3);
  position: relative;
}

.visit-message-header::before {
  content: "";
  width: 8px;
  height: 8px;
  background-color: #4ade80;
  border-radius: 50%;
  border: 2px solid #ffffff;
  animation: pulse 2s infinite;
}

.visit-message-header span {
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.visit-message-body {
  padding: var(--spacing-lg);
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.6;
  color: var(--color-text);
  background-color: #ffffff;
  border-radius: 0.5rem 0.5rem 1.5rem 1.5rem;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12), 0 2px 8px rgba(0, 0, 0, 0.08);
  position: relative;
  margin-top: -0.5rem;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.visit-message-body::before {
  content: "";
  position: absolute;
  top: -12px;
  right: 2rem;
  width: 0;
  height: 0;
  border-left: 12px solid transparent;
  border-right: 12px solid transparent;
  border-bottom: 12px solid #ffffff;
  filter: drop-shadow(0 -2px 4px rgba(0, 0, 0, 0.1));
}

.visit-message-content {
  flex: 1;
}

.visit-message-time {
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1;
  color: var(--color-text-light);
  text-align: right;
  margin-top: var(--spacing-sm);
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.7;
    transform: scale(1.1);
  }
}

/* ------------------------------------------------------------
   Mobile Menu
   ------------------------------------------------------------ */
.sp-menu {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(0.5rem);
  -webkit-backdrop-filter: blur(0.5rem);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal) ease-in-out;
}

.sp-menu.active {
  opacity: 1;
  visibility: visible;
}

.sp-menu ul {
  display: flex;
  flex-direction: column;
  gap: 0;
  padding: var(--spacing-xl);
}

.sp-menu li {
  border-bottom: 1px solid var(--color-border);
}

.sp-menu a {
  display: block;
  padding: var(--spacing-lg) 0;
  font-size: 1.125rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  line-height: 1.7;
  color: var(--color-text);
  text-decoration: none;
  transition: all var(--transition-fast) ease-in-out;
}

.sp-menu a:hover {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 0.1875rem;
}

.sp-menu a:focus-visible {
  outline: 4px solid #000;
  outline-offset: 0.125rem;
  background-color: var(--color-accent);
  color: var(--color-link);
  border-radius: 0.25rem;
}

/* ------------------------------------------------------------
   Responsive Design
   ------------------------------------------------------------ */

/* Tablet */
@media (max-width: 1024px) {
  .skill-group-items {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .ai-consulting-intro {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .profile-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-xl);
  }
  
  .profile-image {
    justify-self: center;
  }
  
  .profile-image img {
    width: 200px;
    height: auto;
    aspect-ratio: 3/4;
    margin: 0 auto;
  }
}

/* Mobile */
@media (max-width: 768px) {
  :root {
    --section-gap: var(--section-gap-sp);
  }
  
  /* 横スクロール完全防止 */
  html, body {
    overflow-x: hidden !important;
    width: 100% !important;
    max-width: 100vw !important;
  }
  
  * {
    max-width: 100% !important;
    box-sizing: border-box !important;
  }
  
  .header-nav {
    display: none;
  }
  
  .header-social {
    display: none;
  }
  
  .header-right {
    gap: var(--spacing-sm);
  }
  
  /* スマホメニューにソーシャルリンクを追加 */
  .sp-menu {
    padding: var(--spacing-xl);
  }
  
  .sp-menu::after {
    content: "";
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
  }
  
  .menu-btn {
    display: flex;
  }
  
  .kv__ttl-container {
    text-align: left;
    overflow-x: hidden !important;
  }
  
  .kv__ttl-container-inner {
    max-width: 100% !important;
    overflow-x: hidden !important;
  }
  
  .skill-group-items {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .skill-category__title {
    font-size: 1.125rem;
  }
  
  .skill-item {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
    text-align: center;
  }
  
  .skill-bar {
    width: 100%;
    max-width: 200px;
    margin: 0 auto;
  }
  
  .skill-year {
    font-size: 0.75rem;
    white-space: normal;
    word-break: break-word;
  }
  
  /* グリッドレイアウトの調整 */
  .skill-group-items {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .ai-consulting-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .works-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .ai-consulting-intro {
    padding: var(--spacing-xl);
    grid-template-columns: 1fr;
    text-align: center;
    overflow-x: hidden;
  }
  
  .ai-consulting-intro__content {
    text-align: center;
    overflow-x: hidden;
  }
  
  .ai-consulting-intro__logo {
    justify-content: center;
    overflow-x: hidden;
  }
  
  .passport-logo-area {
    text-align: center;
    overflow-x: hidden;
  }
  
  .ai-consulting-lead::before {
    left: 50%;
    transform: translateX(-50%);
  }
  
  .ai-consulting-grid {
    grid-template-columns: 1fr;
  }
  
  .works-grid {
    grid-template-columns: 1fr;
  }
  
  .profile-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
  
  .profile-data {
    grid-template-columns: auto 1fr;
    gap: var(--spacing-md) var(--spacing-lg);
    align-items: baseline;
  }
  
  .profile-data dt,
  .profile-data dd {
    text-align: left;
  }
  
  .profile-text {
    text-align: left;
  }
  
  .profile-strength-title {
    text-align: left;
  }
  
  .profile-strength-list {
    text-align: left;
  }
  
  .visit-message {
    bottom: 1rem;
    right: 1rem;
    left: 1rem;
    max-width: none;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-md);
  }
  
  .footer-nav ul {
    justify-content: center;
    flex-wrap: wrap;
  }
  
  .footer-social {
    justify-content: center;
    margin-top: var(--spacing-lg);
  }
  
  .footer-content {
    grid-template-columns: 1fr auto auto;
    align-items: center;
  }
}

/* Small Mobile */
@media (max-width: 480px) {
  .section-inner {
    padding: 0 1rem;
  }
  
  /* 横スクロール防止の強化 */
  html, body {
    overflow-x: hidden !important;
    width: 100% !important;
    max-width: 100% !important;
  }
  
  * {
    max-width: 100% !important;
    box-sizing: border-box !important;
  }
  
  .container,
  .section-inner,
  .kv__ttl-container,
  .header-inner,
  .footer-inner {
    overflow-x: hidden !important;
    width: 100% !important;
    max-width: 100% !important;
  }
  
  .kv__ttl.main {
    font-size: clamp(2rem, 8vw, 2.5rem);
  }
  
  .kv__ttl.sub {
    font-size: clamp(0.875rem, 4vw, 1rem);
  }
  
  .section-header__ttl .ja {
    font-size: 1.5rem;
  }
  
  .ai-consulting-intro {
    padding: var(--spacing-lg);
  }
  
  .ai-consulting-card {
    padding: var(--spacing-lg);
  }
  
  .work-card__content {
    padding: var(--spacing-md);
  }
  
  .contact-button {
    min-height: 3rem;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
  }
}

/* ------------------------------------------------------------
   Mobile Menu
   ------------------------------------------------------------ */
.sp-menu {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(0.5rem);
  -webkit-backdrop-filter: blur(0.5rem);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal) ease-in-out;
}

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

.sp-menu ul {
  display: flex;
  flex-direction: column;
  gap: 0;
  padding: var(--spacing-xl);
}

.sp-menu li {
  border-bottom: 1px solid var(--color-border);
}

.sp-menu a {
  display: block;
  padding: var(--spacing-lg) 0;
  font-size: 1.125rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  line-height: 1.7;
  color: var(--color-text);
  text-decoration: none;
  transition: all var(--transition-fast) ease-in-out;
}

.sp-menu a:hover {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 0.1875rem;
}

.sp-menu a:focus-visible {
  outline: 4px solid #000;
  outline-offset: 0.125rem;
  background-color: var(--color-accent);
  color: var(--color-link);
  border-radius: 0.25rem;
}

/* ------------------------------------------------------------
   Responsive Design
   ------------------------------------------------------------ */
@media (max-width: 64em) {
  :root {
    --header-height: 4.5rem;
    --section-gap: var(--section-gap-sp);
  }

  .header-nav {
    display: none;
  }

  .menu-btn {
    display: flex;
  }

  .section-header__ttl .ja {
    font-size: 1.5rem;
  }

  .section-header__ttl .en {
    font-size: 0.875rem;
  }

  .kv__ttl.main {
    font-size: clamp(2rem, 6vw, 3rem);
  }

  .kv__ttl.sub {
    font-size: clamp(0.875rem, 3vw, 1.125rem);
  }

  .ai-consulting-intro {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  .ai-consulting-intro__logo {
    justify-content: center;
    min-width: auto;
  }

  .qualification-item {
    justify-content: center;
  }

  .ai-consulting-grid {
    grid-template-columns: 1fr;
  }

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

  .profile-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    text-align: center;
  }

  .profile-image {
    justify-self: center;
  }

  .profile-data {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }

  .profile-data dt {
    margin-top: var(--spacing-lg);
  }

  .profile-data dt:first-child {
    margin-top: 0;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    text-align: center;
  }

  .footer-nav ul {
    justify-content: center;
    flex-wrap: wrap;
  }

  .visit-message {
    bottom: 1rem;
    right: 1rem;
    left: 1rem;
    max-width: none;
  }
}

@media (max-width: 48em) {
  .section-inner {
    padding: 0 1rem;
  }
  
  /* 横スクロール防止の追加対策 */
  html, body {
    overflow-x: hidden !important;
    width: 100% !important;
    max-width: 100% !important;
  }
  
  .work-link {
    max-width: 100% !important;
    overflow-wrap: break-word !important;
    word-wrap: break-word !important;
    hyphens: auto;
  }
  
  /* 全ての要素に横スクロール防止を適用 */
  * {
    overflow-x: hidden !important;
    max-width: 100% !important;
  }
  
  /* グリッドとフレックスボックスの調整 */
  .grid,
  .skill-group-items,
  .ai-consulting-grid,
  .works-grid {
    overflow-x: hidden !important;
  }

  .container {
    padding: 0 1rem;
  }

  .header-inner {
    padding: 0 1rem;
  }

  .footer-inner {
    padding: var(--spacing-xl) 1rem;
  }

  .skill-item {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
    text-align: center;
  }

  .skill-bar {
    width: 100%;
  }

  .work-card__content {
    padding: var(--spacing-lg);
  }

  .contact-button {
    padding: var(--spacing-lg) var(--spacing-xl);
    font-size: 1rem;
  }
}

/* ------------------------------------------------------------
   Utility Classes
   ------------------------------------------------------------ */
.u-visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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

.u-text-left {
  text-align: left;
}

.u-text-right {
  text-align: right;
}

.u-mb-0 {
  margin-bottom: 0;
}

.u-mt-0 {
  margin-top: 0;
}

/* ------------------------------------------------------------
   Animation Classes
   ------------------------------------------------------------ */
.fade-in {
  opacity: 1;
  transform: translateY(0);
}

/* ------------------------------------------------------------
   Print Styles
   ------------------------------------------------------------ */
@media print {

  .header,
  .visit-message,
  .sp-menu,
  .scroll-indicator {
    display: none;
  }

  .kv {
    height: auto;
    min-height: auto;
    page-break-inside: avoid;
  }

  .section {
    page-break-inside: avoid;
  }

  a {
    text-decoration: underline;
  }

  .button,
  .contact-button {
    border: 1px solid var(--color-text);
    background-color: transparent;
    color: var(--color-text);
  }
}