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

:root {
  --color-bg: #fffaf5;
  --color-surface: #ffffff;
  --color-text: #2c2420;
  --color-text-light: #7a6b63;
  --color-accent: #e08a5e;
  --color-accent-hover: #c97448;
  --color-border: #f0e6de;
  --color-tag-bg: #fef3eb;
  --color-highlight: #fff0e6;
  --font: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  --max-width: 1080px;
  --radius: 16px;
  --transition: 0.3s ease;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 250, 245, 0.92);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--color-text-light);
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--color-text);
}

.btn-nav {
  background: var(--color-accent);
  color: #fff !important;
  padding: 8px 20px;
  border-radius: 8px;
  font-weight: 500;
  transition: background var(--transition);
}

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

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: var(--transition);
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 80px 24px;
  background: linear-gradient(135deg, #fff5ed 0%, #ffecd2 30%, #fce4ec 60%, #e8f5e9 100%);
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 20%;
  left: 10%;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(224, 138, 94, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 15%;
  right: 15%;
  width: 160px;
  height: 160px;
  background: radial-gradient(circle, rgba(156, 204, 101, 0.12) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-label {
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--color-text-light);
  margin-bottom: 40px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition);
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 4px 16px rgba(224, 138, 94, 0.3);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(224, 138, 94, 0.4);
}

.btn-secondary {
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

/* Section Common */
section {
  padding: 100px 0;
}

.section-title {
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-text-light);
  text-align: center;
}

.section-subtitle {
  font-size: 1.8rem;
  font-weight: 700;
  text-align: center;
  margin-top: 8px;
  margin-bottom: 60px;
}

/* Services */
.services {
  background: var(--color-surface);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.service-card {
  padding: 40px 32px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: all var(--transition);
  background: var(--color-surface);
}

.service-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(224, 138, 94, 0.1);
}

.service-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 24px;
  color: var(--color-accent);
}

.service-icon svg {
  width: 100%;
  height: 100%;
}

.service-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.service-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 20px;
}

.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
}

.service-tags li {
  font-size: 0.75rem;
  padding: 4px 12px;
  background: var(--color-tag-bg);
  border-radius: 20px;
  color: var(--color-text-light);
}

/* Works */
.works-note {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-top: -44px;
  margin-bottom: 48px;
}

.works-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.work-card {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
  background: var(--color-surface);
  display: block;
}

.work-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(224, 138, 94, 0.1);
}

.work-thumb {
  height: 180px;
  display: flex;
  align-items: flex-end;
  padding: 16px;
  position: relative;
}

.work-category {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 4px 12px;
  background: rgba(255, 255, 255, 0.85);
  border-radius: 20px;
  color: var(--color-text);
}

.work-info {
  padding: 20px 24px 24px;
}

.work-info h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.work-info p {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.skill-item {
  padding: 28px 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: all var(--transition);
}

.skill-item:hover {
  border-color: var(--color-accent);
}

.skill-name {
  display: block;
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 8px;
}

.skill-detail {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

/* About */
.about {
  background: var(--color-surface);
}

.about-text {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
}

.about-text p {
  margin-bottom: 16px;
  color: var(--color-text-light);
  font-size: 0.95rem;
}

.about-text p:first-child {
  color: var(--color-text);
  font-weight: 500;
  font-size: 1.1rem;
}

/* Contact */
.contact-desc {
  text-align: center;
  color: var(--color-text-light);
  margin-top: -40px;
  margin-bottom: 48px;
}

.contact-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  max-width: 720px;
  margin: 0 auto;
}

.contact-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 32px 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: all var(--transition);
  font-size: 0.9rem;
  font-weight: 500;
}

.contact-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(224, 138, 94, 0.1);
  background: var(--color-highlight);
}

.contact-card svg {
  width: 28px;
  height: 28px;
}

/* Footer */
.footer {
  text-align: center;
  padding: 32px 24px;
  font-size: 0.8rem;
  color: var(--color-text-light);
  border-top: 1px solid var(--color-border);
}
.footer-links {
  margin-bottom: 8px;
}
.footer-links a {
  color: var(--color-text-light);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}
.footer-links a:hover {
  border-bottom-color: var(--color-text-light);
}

/* Mobile */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-surface);
    flex-direction: column;
    justify-content: center;
    gap: 40px;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    font-size: 1.2rem;
  }

  .hamburger {
    display: flex;
  }

  .hamburger.open span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

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

  .hamburger.open span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .hero h1 {
    font-size: 1.8rem;
  }

  section {
    padding: 72px 0;
  }

  .section-subtitle {
    font-size: 1.4rem;
    margin-bottom: 40px;
  }

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

/* Services lead text + 4-card variant */
.services-lead {
  text-align: center;
  color: var(--color-text-light);
  margin-top: -40px;
  margin-bottom: 48px;
  font-size: 0.95rem;
  line-height: 1.9;
}

.services-grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

@media (max-width: 768px) {
  .services-grid-4 {
    grid-template-columns: 1fr;
  }
}

/* Why AI section */
.why-ai {
  background: linear-gradient(180deg, var(--color-bg) 0%, #fff5ed 100%);
}

.why-ai-lead {
  text-align: center;
  color: var(--color-text-light);
  margin-top: -40px;
  margin-bottom: 56px;
  font-size: 0.95rem;
}

.reason-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 56px;
}

.reason-card {
  position: relative;
  padding: 44px 28px 32px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: all var(--transition);
}

.reason-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(224, 138, 94, 0.1);
}

.reason-num {
  position: absolute;
  top: 18px;
  right: 24px;
  font-family: 'Cormorant Garamond', Georgia, serif;
  font-size: 2.4rem;
  font-weight: 600;
  color: var(--color-accent);
  opacity: 0.45;
  letter-spacing: -0.02em;
}

.reason-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-text);
}

.reason-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.85;
}

.ai-tools {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
  padding: 28px 24px;
  background: var(--color-surface);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
}

.ai-tools-label {
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  color: var(--color-text-light);
  margin-bottom: 18px;
  text-transform: uppercase;
}

.ai-tools-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px 18px;
}

.ai-tool {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 16px;
  background: var(--color-tag-bg);
  border-radius: 10px;
  font-size: 0.78rem;
  color: var(--color-text-light);
  min-width: 110px;
  gap: 2px;
}

.ai-tool strong {
  font-size: 0.92rem;
  color: var(--color-text);
  font-weight: 700;
}

/* Pricing */
.pricing {
  background: var(--color-bg);
}

.pricing-desc {
  text-align: center;
  color: var(--color-text-light);
  margin-top: -40px;
  margin-bottom: 48px;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  max-width: 980px;
  margin: 0 auto;
}

.price-card {
  position: relative;
  padding: 40px 32px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  transition: all var(--transition);
  text-align: center;
}

.price-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(224, 138, 94, 0.1);
}

.price-card-featured {
  border-color: var(--color-accent);
  box-shadow: 0 8px 30px rgba(224, 138, 94, 0.15);
}

.price-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 4px 16px;
  border-radius: 20px;
  letter-spacing: 0.05em;
}

.price-label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-light);
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.price {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.price span {
  font-size: 1rem;
  color: var(--color-text-light);
  font-weight: 400;
  margin-left: 2px;
}

.price-target {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
}

.price-examples-title {
  text-align: left;
  font-size: 0.78rem;
  color: var(--color-text-light);
  margin-bottom: 8px;
  letter-spacing: 0.05em;
  padding: 0 8px;
}

.price-features {
  list-style: none;
  text-align: left;
  padding: 0 8px;
  margin-bottom: 20px;
}

.price-features li {
  font-size: 0.85rem;
  padding: 6px 0;
  color: var(--color-text);
  position: relative;
  padding-left: 22px;
  line-height: 1.55;
}

.price-features li::before {
  content: '◯';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-size: 0.7rem;
  top: 9px;
}

.price-meta {
  text-align: center;
  font-size: 0.78rem;
  color: var(--color-text-light);
  padding: 12px 0 0;
  border-top: 1px dashed var(--color-border);
  margin-top: 8px;
}

.pricing-note {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-top: 40px;
  line-height: 1.8;
}

/* About meta */
.about-meta {
  max-width: 640px;
  margin: 48px auto 0;
}

.meta-list {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 8px 28px;
}

.meta-row {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.9rem;
}

.meta-row:last-child {
  border-bottom: none;
}

.meta-row dt {
  font-weight: 500;
  color: var(--color-text-light);
  font-size: 0.85rem;
}

.meta-row dd {
  color: var(--color-text);
}

@media (max-width: 540px) {
  .meta-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}

/* Animation */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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