@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+JP:wght@400;700&family=Outfit:wght@300;400;500;600;700;800&family=Noto+Sans+JP:wght@300;400;500;700&display=swap');

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

:root {
  /* --- Color System (和 × モダンテック - 白基調・ブルーアクセント) --- */
  --bg-primary: #ffffff;      /* 純白 - メイン背景 */
  --bg-secondary: #f6f3eb;    /* 砂色 (Sunairo) - ヘッダー・フッター用ベージュ */
  --bg-tertiary: #faf9f6;     /* 乳白色 (Nyuhakushoku) - カード背景用オフホワイト */
  --bg-glass: rgba(246, 243, 235, 0.85);
  
  --text-primary: #1e293b;    /* 墨色 (Sumiiro) - メインダークグレー */
  --text-secondary: #475569;  /* 鈍色 - サブグレー */
  --text-muted: #64748b;       /* 煤竹 - 暗めのスチールグレー */
  
  --accent: #0284c7;          /* 露草色 (Tsuyukusairo) - 澄んだブルー */
  --accent-rgb: 2, 132, 199;
  --accent-glow: rgba(2, 132, 199, 0.2);
  --accent-blue: #0369a1;     /* 藍色 - ディープブルー */
  --accent-silver: #94a3b8;   /* 鋼 - スチールグレー */
  
  --border: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(0, 0, 0, 0.16);
  --border-accent: rgba(2, 132, 199, 0.3);

  /* --- Typography --- */
  --font-sans: 'Outfit', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Noto Serif JP', serif;

  /* --- Transitions & Easings --- */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.25s var(--ease-out-expo);
  --transition-normal: 0.5s var(--ease-out-expo);
  --transition-slow: 0.9s var(--ease-out-expo);
  
  /* --- Layout & Spacing --- */
  --container-max-width: 1200px;
  --header-height: 80px;
}

html {
  scroll-behavior: smooth;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 10% 20%, rgba(2, 132, 199, 0.02) 0%, transparent 45%),
    radial-gradient(circle at 90% 80%, rgba(3, 105, 161, 0.02) 0%, transparent 45%);
  background-attachment: fixed;
}

body.menu-open {
  overflow: hidden;
}

/* --- Typography Utilities --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.03em;
}

h2 {
  font-size: 2rem;
  position: relative;
  display: inline-block;
  margin-bottom: 2.5rem;
}

h2::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 40px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  transition: width var(--transition-normal);
}

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

.section {
  padding: 6rem 0;
  position: relative;
}

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

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

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 2rem;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-primary);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  letter-spacing: 0.05em;
  transition: var(--transition-normal);
}

.btn-primary {
  border-color: var(--accent);
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.05), transparent);
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: var(--transition-slow);
}

.btn-primary:hover {
  background: var(--accent);
  color: #ffffff;
  font-weight: 600;
  box-shadow: 0 0 20px var(--accent-glow);
  transform: translateY(-2px);
}

.btn-primary:hover::before {
  left: 100%;
}

.btn-secondary {
  background: rgba(0, 0, 0, 0.02);
  border-color: var(--border);
}

.btn-secondary:hover {
  background: rgba(0, 0, 0, 0.05);
  border-color: var(--accent-silver);
  transform: translateY(-2px);
}

.btn-text {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-text .arrow {
  transition: transform var(--transition-fast);
}

.btn-text:hover {
  color: var(--accent);
}

.btn-text:hover .arrow {
  transform: translateX(5px);
}

/* --- Header / Navigation --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 1000;
  background-color: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition-normal);
}

.site-header.scrolled {
  height: 70px;
  background-color: rgba(246, 243, 235, 0.95);
  box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--text-primary);
}

.site-logo img {
  height: 32px;
  width: auto;
}

.site-logo span {
  color: var(--accent);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 3rem;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 2.5rem;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  position: relative;
  padding: 0.5rem 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--accent);
  transition: var(--transition-normal);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1100;
  width: 30px;
  height: 30px;
  position: relative;
}

.mobile-menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--text-primary);
  margin: 6px 0;
  transition: var(--transition-normal);
}

/* --- Hero Section --- */
.hero {
  height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: var(--header-height);
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    linear-gradient(to bottom, transparent, var(--bg-primary)),
    radial-gradient(circle at 70% 30%, rgba(2, 132, 199, 0.04) 0%, transparent 60%);
  z-index: 1;
}

.hero-blade-glow {
  position: absolute;
  top: 30%;
  left: -20%;
  width: 150%;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(2, 132, 199, 0.1), var(--accent), transparent);
  transform: rotate(-15deg);
  z-index: 2;
  opacity: 0.5;
  animation: bladePulse 6s infinite var(--ease-out-expo);
}

@keyframes bladePulse {
  0%, 100% { opacity: 0.3; transform: rotate(-15deg) scaleX(0.9); }
  50% { opacity: 0.7; transform: rotate(-14deg) scaleX(1.1); }
}

.hero .container {
  position: relative;
  top: -20px;
  z-index: 10;
}

.hero-main-visual {
  margin-bottom: 2.5rem;
}

.hero-main-visual img {
  max-width: 500px;
  width: 100%;
  height: auto;
}

.hero-subtitle {
  font-family: var(--font-sans);
  color: var(--accent);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.3em;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 3.25rem;
  line-height: 1.3;
  margin-bottom: 2rem;
  letter-spacing: 0.05em;
}

.hero-title span {
  background: linear-gradient(120deg, var(--text-primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 600px;
  margin-bottom: 3rem;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 1.5rem;
}

/* --- Information Card Section (HOME) --- */
.info-section-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.info-card {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border);
  padding: 1.75rem 2rem;
  border-radius: 4px;
  transition: var(--transition-normal);
}

.info-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-3px);
  background-color: var(--bg-primary);
  box-shadow: 0 10px 30px rgba(2, 132, 199, 0.04);
}

.info-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.75rem;
  font-size: 0.85rem;
}

.info-meta time {
  color: var(--text-muted);
  font-family: var(--font-sans);
}

.info-tag {
  padding: 0.2rem 0.6rem;
  border-radius: 2px;
  font-size: 0.75rem;
  font-weight: 500;
  border: 1px solid currentColor;
}

.tag-case { color: var(--accent); }
.tag-blog { color: #a855f7; }
.tag-gadget { color: #0284c7; }
.tag-update { color: #2563eb; }
.tag-general { color: var(--text-secondary); }

.info-title {
  font-family: var(--font-sans);
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
  line-height: 1.4;
}

.info-summary {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* --- Works Cards (Grid) --- */
.works-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 2rem;
}

.work-card {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  transition: var(--transition-normal);
}

.work-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-6px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.05);
}

.work-img-container {
  position: relative;
  aspect-ratio: 16/10;
  overflow: hidden;
}

.work-img-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.work-category-label {
  position: absolute;
  top: 1rem;
  left: 1rem;
  background-color: var(--bg-secondary);
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  border-radius: 2px;
  border: 1px solid var(--border);
  letter-spacing: 0.05em;
  color: var(--text-primary);
}

.work-card-content {
  padding: 2rem;
}

.work-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.work-tag {
  font-size: 0.75rem;
  color: var(--text-secondary);
  background-color: var(--bg-primary);
  padding: 0.15rem 0.5rem;
  border-radius: 2px;
  border: 1px solid var(--border);
}

.work-title {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.work-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

/* --- Service Section --- */
.service-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.5rem;
}

@media (max-width: 768px) {
  .service-grid {
    grid-template-columns: 1fr;
  }
}

.service-card {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border);
  padding: 3rem;
  border-radius: 4px;
  transition: var(--transition-normal);
}

.service-card:hover {
  border-color: var(--border-accent);
  background-color: var(--bg-primary);
  transform: translateY(-4px);
}

.service-icon {
  font-size: 2rem;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

.service-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.service-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 2rem;
}

/* --- Flat Ribbon Footer (帯状態フッター) --- */
.site-footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 1.75rem 0;
  color: var(--text-secondary);
  position: relative;
  z-index: 10;
}

.footer-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 3rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-primary);
}

.footer-logo img {
  height: 20px;
  width: auto;
}

.footer-nav {
  display: flex;
  list-style: none;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
  align-items: center;
}

.footer-nav-link {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.footer-nav-link:hover {
  color: var(--accent);
}

.footer-nav-separator {
  color: var(--text-muted);
  font-size: 0.85rem;
  user-select: none;
}

.footer-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-right img {
  height: 24px;
  opacity: 0.8;
}

@media (max-width: 992px) {
  .footer-container {
    flex-direction: column;
    text-align: center;
    gap: 1.5rem;
  }
  .footer-left {
    flex-direction: column;
    gap: 1rem;
  }
  .footer-nav {
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem 1.25rem;
  }
  .footer-nav-separator {
    display: none;
  }
  .footer-right {
    flex-direction: column;
    gap: 0.75rem;
  }
}

/* --- Detail Pages Common --- */
.detail-container {
  padding-top: calc(var(--header-height) + 4rem);
  padding-bottom: 8rem;
  max-width: 800px;
  margin: 0 auto;
}

.detail-header {
  margin-bottom: 3.5rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 2rem;
}

.detail-title {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  margin-top: 1rem;
}

.detail-body {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--text-primary);
}

.detail-body p {
  margin-bottom: 2rem;
}

.detail-footer {
  margin-top: 5rem;
  border-top: 1px solid var(--border);
  padding-top: 3rem;
  text-align: center;
}

/* Works Detail Specific */
.work-detail-container {
  padding-top: calc(var(--header-height) + 4rem);
  padding-bottom: 8rem;
}

.work-detail-header {
  margin-bottom: 4rem;
}

.work-detail-meta {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
}

.work-category-tag {
  background-color: var(--accent);
  color: #fff;
  padding: 0.2rem 0.8rem;
  font-size: 0.8rem;
  border-radius: 2px;
  font-weight: 500;
}

.work-date-tag {
  border: 1px solid var(--border);
  padding: 0.2rem 0.8rem;
  font-size: 0.8rem;
  border-radius: 2px;
  color: var(--text-secondary);
}

.work-detail-title {
  font-family: var(--font-serif);
  font-size: 2.75rem;
  margin-bottom: 1rem;
}

.work-client {
  color: var(--text-secondary);
  font-size: 1rem;
}

.work-detail-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 4rem;
}

@media (max-width: 768px) {
  .work-detail-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

.detail-section {
  margin-bottom: 3.5rem;
}

.detail-section h2 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
}

.sidebar-box {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border);
  padding: 2rem;
  border-radius: 4px;
  margin-bottom: 2rem;
}

.sidebar-box h3 {
  font-family: var(--font-sans);
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.75rem;
}

.info-list dt {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-bottom: 0.25rem;
}

.info-list dd {
  color: var(--text-primary);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tech-tag {
  background-color: var(--bg-primary);
  border: 1px solid var(--border);
  padding: 0.25rem 0.6rem;
  font-size: 0.8rem;
  border-radius: 2px;
}

/* --- Contact Form Styles --- */
.contact-form-container {
  max-width: 700px;
  margin: 0 auto;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border);
  padding: 4rem;
  border-radius: 4px;
}

@media (max-width: 768px) {
  .contact-form-container {
    padding: 2rem;
  }
}

.form-group {
  margin-bottom: 2rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-primary);
  font-weight: 500;
}

.form-group label span {
  color: #ef4444;
  margin-left: 0.25rem;
}

.form-control {
  width: 100%;
  background-color: var(--bg-primary);
  border: 1px solid #cbd5e1; /* 白背景に調和するボーダー */
  border-radius: 4px;
  padding: 0.85rem 1.25rem;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: var(--transition-normal);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 10px rgba(2, 132, 199, 0.1);
}

.form-control.error-input {
  border-color: #ef4444;
}

textarea.form-control {
  resize: vertical;
  min-height: 150px;
}

.form-check {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.form-check input[type="checkbox"] {
  margin-top: 0.3rem;
  accent-color: var(--accent);
}

.form-check label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.hidden {
  display: none !important;
}

/* --- Scroll Entrance Animations --- */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in-up.is-visible,
.fade-in-left.is-visible,
.fade-in-right.is-visible {
  opacity: 1;
  transform: translate(0);
}

/* --- Responsive Menu Overlay --- */
@media (max-width: 992px) {
  .mobile-menu-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 400px;
    height: 100vh;
    background-color: var(--bg-secondary);
    border-left: 1px solid var(--border);
    flex-direction: column;
    justify-content: center;
    gap: 3rem;
    padding: 3rem;
    z-index: 1050;
    transition: var(--transition-normal);
  }

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

  .nav-list {
    flex-direction: column;
    gap: 2rem;
    align-items: center;
  }

  .nav-link {
    font-size: 1.25rem;
  }

  .mobile-menu-toggle.toggle-active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  .mobile-menu-toggle.toggle-active span:nth-child(2) {
    opacity: 0;
  }
  .mobile-menu-toggle.toggle-active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
}