/* ==================== ベーススタイル ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* モノクロカラーパレット */
  --color-black: #000;
  --color-dark: #111;
  --color-darker-gray: #1a1a1a;
  --color-dark-gray: #333;
  --color-gray: #666;
  --color-medium-gray: #999;
  --color-light-gray: #ccc;
  --color-lighter-gray: #eee;
  --color-off-white: #f5f5f5;
  --color-white: #fff;

  /* アクセントカラー（控えめ） */
  --color-accent: #4a90e2;
  --color-accent-hover: #357abd;

  /* シャドウ */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);

  /* トランジション */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

body {
  font-family: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.7;
  color: var(--color-dark-gray);
  background-color: var(--color-white);
  font-size: 16px;
  overflow-x: hidden;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ==================== ヘッダー ==================== */
header {
  background-color: var(--color-white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
  border-bottom: 1px solid var(--color-lighter-gray);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px 40px;
  width: 100%;
}

.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-black);
  letter-spacing: -0.5px;
  transition: color var(--transition-fast);
}

.logo:hover .logo-text {
  color: var(--color-gray);
}

/* ナビゲーション */
.nav-container {
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 40px;
  margin: 0;
}

.nav-menu a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-dark-gray);
  letter-spacing: 0.5px;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-black);
  transition: width var(--transition-normal);
}

.nav-menu a:hover {
  color: var(--color-black);
}

.nav-menu a:hover::after {
  width: 100%;
}

/* 検索ボックス */
.header-actions {
  display: flex;
  align-items: center;
}

.search-box {
  display: flex;
  align-items: center;
  border: 1px solid var(--color-light-gray);
  border-radius: 4px;
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.search-box:focus-within {
  border-color: var(--color-dark-gray);
}

.search-box input {
  border: none;
  outline: none;
  padding: 8px 12px;
  font-size: 0.9rem;
  width: 200px;
  background-color: transparent;
  color: var(--color-dark-gray);
}

.search-box input::placeholder {
  color: var(--color-medium-gray);
}

.search-box button {
  background-color: transparent;
  border: none;
  padding: 8px 12px;
  cursor: pointer;
  color: var(--color-gray);
  transition: color var(--transition-fast);
  display: flex;
  align-items: center;
}

.search-box button:hover {
  color: var(--color-black);
}

/* ハンバーガーメニュー */
.hamburger-menu {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 5px;
  z-index: 101;
}

.hamburger-menu span {
  width: 25px;
  height: 2px;
  background-color: var(--color-black);
  transition: all var(--transition-normal);
}

.hamburger-menu.active span:nth-child(1) {
  transform: rotate(45deg) translate(7px, 7px);
}

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

.hamburger-menu.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* ==================== ヒーローセクション ==================== */
.hero {
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-darker-gray) 0%, var(--color-dark-gray) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    linear-gradient(90deg, rgba(255,255,255,.03) 1px, transparent 1px),
    linear-gradient(rgba(255,255,255,.03) 1px, transparent 1px);
  background-size: 50px 50px;
  opacity: 0.5;
}

.hero-content {
  text-align: center;
  color: var(--color-white);
  position: relative;
  z-index: 1;
  padding: 40px 20px;
  max-width: 800px;
}

.hero-title {
  font-size: 4rem;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: 4px;
  line-height: 1.1;
}

.hero-subtitle {
  font-size: 1.2rem;
  font-weight: 300;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 30px;
  color: var(--color-light-gray);
}

.hero-description {
  font-size: 1.1rem;
  margin-bottom: 40px;
  line-height: 1.8;
  color: var(--color-lighter-gray);
  font-weight: 300;
}

.hero-btn {
  display: inline-block;
  padding: 15px 40px;
  background-color: var(--color-white);
  color: var(--color-black);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 1px;
  border-radius: 4px;
  transition: all var(--transition-normal);
  border: 2px solid var(--color-white);
}

.hero-btn:hover {
  background-color: transparent;
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* ==================== セクション共通スタイル ==================== */
section {
  padding: 100px 0;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 60px;
  letter-spacing: -1px;
  color: var(--color-black);
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background-color: var(--color-black);
  margin: 20px auto 0;
}

/* ==================== ABOUTセクション ==================== */
.about-section {
  background-color: var(--color-off-white);
}

.about-content {
  max-width: 1000px;
  margin: 0 auto;
}

.about-profile {
  display: flex;
  align-items: center;
  gap: 40px;
  padding: 40px;
  background-color: var(--color-white);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
}

.profile-image {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
  border: 3px solid var(--color-lighter-gray);
}

.profile-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.profile-text h3 {
  font-size: 1.5rem;
  margin-bottom: 15px;
  color: var(--color-black);
  font-weight: 600;
}

.profile-text p {
  line-height: 1.8;
  color: var(--color-gray);
}

/* ==================== WORKSセクション ==================== */
.works-section {
  background-color: var(--color-white);
}

/* タブスタイル */
.filter-section {
  margin-bottom: 50px;
}

.tabs {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.tab {
  padding: 12px 30px;
  background-color: var(--color-white);
  border: 2px solid var(--color-lighter-gray);
  color: var(--color-gray);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 0.95rem;
  border-radius: 4px;
}

.tab:hover {
  border-color: var(--color-light-gray);
  color: var(--color-dark-gray);
}

.tab.active {
  background-color: var(--color-black);
  color: var(--color-white);
  border-color: var(--color-black);
}

/* フィルターコンテナ */
.filter-container {
  background-color: var(--color-off-white);
  padding: 30px;
  border-radius: 8px;
  margin-bottom: 30px;
  border: 1px solid var(--color-lighter-gray);
}

.filter-heading {
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--color-black);
  font-size: 1rem;
}

.filter-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.filter-item {
  padding: 8px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-light-gray);
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 0.9rem;
  color: var(--color-dark-gray);
}

.filter-item:hover {
  border-color: var(--color-dark-gray);
  background-color: var(--color-off-white);
}

.filter-item.active {
  background-color: var(--color-dark-gray);
  color: var(--color-white);
  border-color: var(--color-dark-gray);
}

/* プロジェクトグリッド */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 30px;
  margin-bottom: 40px;
}

.project-card {
  background-color: var(--color-white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  cursor: pointer;
  border: 1px solid var(--color-lighter-gray);
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-light-gray);
}

.project-thumbnail {
  width: 100%;
  height: 220px;
  background: linear-gradient(135deg, var(--color-lighter-gray) 0%, var(--color-light-gray) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.project-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  transition: transform var(--transition-slow);
}

.project-card:hover .project-thumbnail img {
  transform: scale(1.05);
}

.project-thumbnail i {
  font-size: 3rem;
  color: var(--color-medium-gray);
}

.project-info {
  padding: 25px;
}

.project-category {
  display: inline-block;
  padding: 4px 12px;
  color: var(--color-white);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 3px;
  margin-bottom: 12px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.project-category.category-webapp {
  background-color: #dc3545;
}

.project-category.category-website {
  background-color: #0d6efd;
}

.project-category.category-other {
  background-color: var(--color-black);
}

.project-title {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-black);
  line-height: 1.3;
}

.project-description {
  font-size: 0.9rem;
  color: var(--color-gray);
  line-height: 1.6;
  margin-bottom: 15px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 15px;
}

.tech-tag {
  padding: 4px 10px;
  background-color: var(--color-off-white);
  border: 1px solid var(--color-lighter-gray);
  font-size: 0.75rem;
  border-radius: 3px;
  color: var(--color-gray);
  font-weight: 500;
}

/* 検索結果なし */
.no-results {
  text-align: center;
  padding: 80px 20px;
  color: var(--color-gray);
}

.no-results i {
  font-size: 4rem;
  color: var(--color-light-gray);
  margin-bottom: 20px;
}

.no-results p {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.no-results-sub {
  font-size: 0.9rem;
  color: var(--color-medium-gray);
}

/* ==================== CONTACTセクション ==================== */
.contact-section {
  background-color: var(--color-darker-gray);
  color: var(--color-white);
}

.contact-box {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.contact-section .section-title {
  color: var(--color-white);
}

.contact-section .section-title::after {
  background-color: var(--color-white);
}

.contact-description {
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: 40px;
  color: var(--color-lighter-gray);
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 15px 30px;
  background-color: transparent;
  color: var(--color-white);
  border: 2px solid var(--color-white);
  font-weight: 600;
  border-radius: 4px;
  transition: all var(--transition-normal);
  font-size: 0.95rem;
}

.contact-btn:hover {
  background-color: var(--color-white);
  color: var(--color-black);
  transform: translateY(-2px);
}

.contact-btn i {
  font-size: 1.2rem;
}

/* ==================== モーダルウィンドウ ==================== */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(5px);
}

.modal-content {
  background-color: var(--color-white);
  margin: 40px auto;
  width: 90%;
  max-width: 900px;
  border-radius: 8px;
  position: relative;
  animation: modalSlideIn 0.3s ease;
  max-height: 90vh;
  overflow-y: auto;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-50px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.close {
  position: absolute;
  right: 20px;
  top: 20px;
  font-size: 2rem;
  font-weight: 300;
  color: var(--color-gray);
  cursor: pointer;
  z-index: 10;
  transition: color var(--transition-fast);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-off-white);
  border-radius: 50%;
}

.close:hover {
  color: var(--color-black);
}

.modal-body {
  padding: 40px;
}

.modal-header {
  margin-bottom: 30px;
}

.modal-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-black);
  margin-bottom: 10px;
}

.modal-category {
  display: inline-block;
  padding: 6px 15px;
  color: var(--color-white);
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.modal-category.category-webapp {
  background-color: #dc3545;
}

.modal-category.category-website {
  background-color: #0d6efd;
}

.modal-category.category-other {
  background-color: var(--color-black);
}

.modal-images-container {
  position: relative;
  margin-bottom: 30px;
  border-radius: 8px;
  overflow: hidden;
  background-color: var(--color-off-white);
}

.modal-images {
  display: flex;
  overflow-x: auto;
  scroll-behavior: smooth;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.modal-images::-webkit-scrollbar {
  height: 8px;
}

.modal-images::-webkit-scrollbar-track {
  background: var(--color-lighter-gray);
}

.modal-images::-webkit-scrollbar-thumb {
  background: var(--color-gray);
  border-radius: 4px;
}

.modal-image {
  min-width: 100%;
  height: 400px;
  scroll-snap-align: start;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-lighter-gray) 0%, var(--color-light-gray) 100%);
}

.modal-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
}

.modal-image i {
  font-size: 5rem;
  color: var(--color-medium-gray);
}

.modal-scroll-arrows {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 100%;
  display: flex;
  justify-content: space-between;
  padding: 0 10px;
  pointer-events: none;
}

.modal-scroll-arrow {
  width: 45px;
  height: 45px;
  background-color: rgba(0, 0, 0, 0.6);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  cursor: pointer;
  pointer-events: all;
  transition: background-color var(--transition-fast);
  backdrop-filter: blur(5px);
}

.modal-scroll-arrow:hover {
  background-color: rgba(0, 0, 0, 0.8);
}

.modal-image-caption {
  text-align: center;
  padding: 15px 20px;
  color: var(--color-gray);
  font-size: 0.95rem;
  line-height: 1.6;
  min-height: 50px;
  background-color: var(--color-white);
  border-top: 1px solid var(--color-lighter-gray);
}

.modal-indicators {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 30px;
}

.indicator {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-light-gray);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.indicator.active {
  background-color: var(--color-black);
  transform: scale(1.2);
}

.modal-info {
  color: var(--color-dark-gray);
}

.modal-section {
  margin-bottom: 30px;
}

.modal-section h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-black);
}

.modal-section p {
  line-height: 1.8;
  color: var(--color-gray);
}

.modal-tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.modal-tech-tag {
  padding: 8px 16px;
  background-color: var(--color-off-white);
  border: 1px solid var(--color-lighter-gray);
  border-radius: 4px;
  font-size: 0.9rem;
  color: var(--color-dark-gray);
  font-weight: 500;
}

.modal-features {
  list-style-position: inside;
  line-height: 2;
  color: var(--color-gray);
}

.modal-features li {
  padding-left: 10px;
}

.modal-links {
  display: flex;
  gap: 15px;
  margin-top: 30px;
  padding-top: 30px;
  border-top: 1px solid var(--color-lighter-gray);
  flex-wrap: wrap;
}

.modal-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background-color: var(--color-black);
  color: var(--color-white);
  border-radius: 4px;
  transition: all var(--transition-normal);
  font-weight: 500;
  font-size: 0.9rem;
}

.modal-link:hover {
  background-color: var(--color-dark-gray);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.modal-link i {
  font-size: 1.1rem;
}

/* ==================== フッター ==================== */
footer {
  background-color: var(--color-dark);
  color: var(--color-light-gray);
  padding: 60px 0 20px;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-section h4 {
  color: var(--color-white);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.footer-section p {
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: 10px;
}

.footer-section ul li a {
  color: var(--color-light-gray);
  transition: color var(--transition-fast);
  font-size: 0.9rem;
}

.footer-section ul li a:hover {
  color: var(--color-white);
}

.footer-social {
  display: flex;
  gap: 15px;
}

.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-gray);
  border-radius: 50%;
  color: var(--color-light-gray);
  transition: all var(--transition-fast);
}

.footer-social a:hover {
  background-color: var(--color-white);
  color: var(--color-black);
  border-color: var(--color-white);
}

.footer-social i {
  font-size: 1.1rem;
}

.copyright {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid var(--color-darker-gray);
  font-size: 0.85rem;
  color: var(--color-gray);
}

/* ==================== レスポンシブデザイン ==================== */

@media (max-width: 1024px) {
  .hero-title {
    font-size: 3rem;
  }

  .projects-grid {
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  }
}

@media (max-width: 768px) {
  /* ヘッダー */
  .header-container {
    padding: 15px 20px;
  }

  .hamburger-menu {
    display: flex;
  }

  .nav-container {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background-color: var(--color-white);
    flex-direction: column;
    align-items: flex-start;
    padding: 80px 30px 30px;
    transition: right var(--transition-normal);
    box-shadow: var(--shadow-lg);
    gap: 30px;
  }

  .nav-container.active {
    right: 0;
  }

  .nav-menu {
    flex-direction: column;
    gap: 20px;
    width: 100%;
  }

  .nav-menu a {
    font-size: 1.1rem;
  }

  .search-box {
    width: 100%;
  }

  .search-box input {
    width: 100%;
  }

  /* ヒーロー */
  .hero {
    min-height: 70vh;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .hero-description {
    font-size: 1rem;
  }

  /* セクション */
  section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 2rem;
    margin-bottom: 40px;
  }

  /* ABOUT */
  .about-profile {
    flex-direction: column;
    text-align: center;
    padding: 30px 20px;
  }

  /* タブ */
  .tabs {
    flex-direction: column;
  }

  .tab {
    width: 100%;
    text-align: center;
  }

  /* プロジェクトグリッド */
  .projects-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  /* モーダル */
  .modal-content {
    width: 95%;
    margin: 20px auto;
  }

  .modal-body {
    padding: 30px 20px;
  }

  .modal-title {
    font-size: 1.5rem;
  }

  .modal-image {
    height: 250px;
  }

  .close {
    right: 10px;
    top: 10px;
  }

  /* フッター */
  .footer-content {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }

  .hero-btn {
    padding: 12px 30px;
    font-size: 0.9rem;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .contact-links {
    flex-direction: column;
  }

  .contact-btn {
    width: 100%;
    justify-content: center;
  }
}

/* ==================== ユーティリティクラス ==================== */
.text-center {
  text-align: center;
}

.mt-20 {
  margin-top: 20px;
}

.mb-20 {
  margin-bottom: 20px;
}

.hidden {
  display: none !important;
}

/* スムーズスクロール */
html {
  scroll-behavior: smooth;
}