/* ===== 基本設定 ===== */
:root {
  --color-bg: #FAFAF7;
  --color-bg-alt: #F5F3EC;
  --color-bg-dark: #0A1F3D;
  --color-text: #0A1F3D;
  --color-text-muted: #4A5568;
  --color-text-light: #6B7280;
  --color-accent: #B8985A;
  --color-accent-dark: #9C7F45;
  --color-border: rgba(10, 31, 61, 0.12);
  --color-border-light: rgba(10, 31, 61, 0.06);

  --font-serif-ja: 'Noto Serif JP', 'Hiragino Mincho ProN', 'Yu Mincho', serif;
  --font-sans-ja: 'Noto Sans JP', 'Hiragino Sans', sans-serif;
  --font-serif-en: 'Cormorant Garamond', 'Noto Serif JP', serif;
  --font-sans-en: 'Montserrat', 'Noto Sans JP', sans-serif;

  --container: 1200px;
  --container-narrow: 960px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans-ja);
  font-weight: 400;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.8;
  letter-spacing: 0.03em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: opacity 0.3s ease, color 0.3s ease;
}

a:hover {
  opacity: 0.7;
}

ul {
  list-style: none;
}

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

.pc-only {
  display: inline;
}

@media (max-width: 768px) {
  .pc-only {
    display: none;
  }
}

/* ===== ヘッダー ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(250, 250, 247, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 100;
  border-bottom: 0.5px solid var(--color-border-light);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1.25rem;
  padding-bottom: 1.25rem;
}

.logo {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  font-size: 0.95rem;
  font-weight: 500;
}

.logo-mark {
  font-family: var(--font-serif-ja);
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: 0.1em;
}

.logo-text {
  font-family: var(--font-sans-en);
  font-weight: 300;
  font-size: 0.7rem;
  color: var(--color-text);
  letter-spacing: 0.25em;
}

.nav-main {
  display: flex;
  gap: 2.5rem;
}

.nav-main a {
  font-family: var(--font-sans-en);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  color: var(--color-text);
  position: relative;
  padding: 0.25rem 0;
}

.nav-main a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 0.5px;
  background: var(--color-accent);
  transition: width 0.3s ease, left 0.3s ease;
}

.nav-main a:hover {
  opacity: 1;
  color: var(--color-accent-dark);
}

.nav-main a:hover::after {
  width: 100%;
  left: 0;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 28px;
  height: 28px;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 1px;
  background: var(--color-text);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 768px) {
  .nav-main {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    flex-direction: column;
    gap: 0;
    padding: 1rem 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
    border-bottom: 0.5px solid var(--color-border-light);
  }

  .nav-main.active {
    max-height: 400px;
  }

  .nav-main a {
    padding: 1rem 2rem;
    text-align: center;
    border-bottom: 0.5px solid var(--color-border-light);
  }

  .nav-main a:last-child {
    border-bottom: none;
  }

  .nav-toggle {
    display: flex;
  }
}

/* ===== ヒーロー ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 8rem 0 6rem;
  position: relative;
  background: var(--color-bg);
}

.hero::before {
  content: '';
  position: absolute;
  top: 20%;
  right: -10%;
  width: 500px;
  height: 500px;
  border: 0.5px solid var(--color-border-light);
  border-radius: 50%;
  z-index: 0;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 15%;
  left: -5%;
  width: 300px;
  height: 300px;
  border: 0.5px solid var(--color-border-light);
  border-radius: 50%;
  z-index: 0;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-label {
  font-family: var(--font-sans-en);
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--color-accent);
  letter-spacing: 0.4em;
  margin-bottom: 2rem;
}

.hero-title {
  font-family: var(--font-serif-ja);
  font-weight: 400;
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.5;
  letter-spacing: 0.08em;
  color: var(--color-text);
  margin-bottom: 2.5rem;
}

.hero-lead {
  font-family: var(--font-sans-ja);
  font-size: clamp(0.9rem, 1.5vw, 1rem);
  line-height: 2.2;
  color: var(--color-text-muted);
  max-width: 640px;
  letter-spacing: 0.08em;
  font-weight: 300;
}

.hero-scroll {
  position: absolute;
  bottom: -3rem;
  left: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.hero-scroll span {
  font-family: var(--font-sans-en);
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  color: var(--color-text-light);
}

.scroll-line {
  width: 0.5px;
  height: 60px;
  background: linear-gradient(to bottom, var(--color-accent) 0%, transparent 100%);
  animation: scroll-pulse 2s ease-in-out infinite;
}

@keyframes scroll-pulse {
  0%, 100% {
    opacity: 0.3;
    transform: scaleY(0.6);
    transform-origin: top;
  }
  50% {
    opacity: 1;
    transform: scaleY(1);
  }
}

/* ===== セクション共通 ===== */
.section {
  padding: 8rem 0;
  position: relative;
}

.section-head {
  text-align: center;
  margin-bottom: 5rem;
}

.section-label {
  font-family: var(--font-sans-en);
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--color-accent);
  letter-spacing: 0.4em;
  margin-bottom: 1rem;
}

.section-title {
  font-family: var(--font-serif-ja);
  font-weight: 400;
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--color-text);
  letter-spacing: 0.1em;
  position: relative;
  display: inline-block;
  padding-bottom: 1.5rem;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 0.5px;
  background: var(--color-accent);
}

/* ===== About ===== */
.section-about {
  background: var(--color-bg);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 5rem;
  align-items: start;
  max-width: var(--container-narrow);
  margin: 0 auto;
}

.about-message {
  font-family: var(--font-serif-ja);
  font-size: clamp(1.25rem, 2.2vw, 1.5rem);
  line-height: 2;
  color: var(--color-text);
  margin-bottom: 2.5rem;
  letter-spacing: 0.05em;
  font-weight: 400;
}

.about-message em {
  color: var(--color-accent-dark);
  font-style: normal;
  font-weight: 500;
}

.about-body {
  font-size: 0.95rem;
  line-height: 2;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
  font-weight: 300;
}

.about-values {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.value-item {
  padding: 1.75rem 1.5rem;
  background: var(--color-bg-alt);
  border-left: 2px solid var(--color-accent);
  transition: transform 0.3s ease;
}

.value-item:hover {
  transform: translateX(4px);
}

.value-number {
  font-family: var(--font-serif-en);
  font-size: 1.5rem;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
  letter-spacing: 0.1em;
}

.value-title {
  font-family: var(--font-serif-ja);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 0.5rem;
  letter-spacing: 0.1em;
}

.value-body {
  font-size: 0.85rem;
  line-height: 1.8;
  color: var(--color-text-muted);
  font-weight: 300;
}

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

/* ===== Services ===== */
.section-services {
  background: var(--color-bg-alt);
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  max-width: var(--container-narrow);
  margin: 0 auto;
}

.service-card {
  background: var(--color-bg);
  padding: 3rem 2.5rem;
  border: 0.5px solid var(--color-border);
  transition: transform 0.4s ease, border-color 0.4s ease;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s ease;
}

.service-card:hover {
  transform: translateY(-4px);
  border-color: rgba(184, 152, 90, 0.3);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-number {
  font-family: var(--font-serif-en);
  font-size: 2rem;
  color: var(--color-accent);
  margin-bottom: 1.5rem;
  letter-spacing: 0.1em;
  font-weight: 300;
}

.service-title {
  font-family: var(--font-serif-ja);
  font-size: 1.35rem;
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: 0.08em;
  margin-bottom: 0.25rem;
}

.service-subtitle {
  font-family: var(--font-sans-en);
  font-size: 0.7rem;
  font-weight: 300;
  color: var(--color-accent);
  letter-spacing: 0.25em;
  margin-bottom: 1.5rem;
}

.service-body {
  font-size: 0.9rem;
  line-height: 1.9;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
  font-weight: 300;
}

.service-features {
  padding-top: 1.25rem;
  border-top: 0.5px solid var(--color-border-light);
}

.service-features li {
  font-size: 0.85rem;
  color: var(--color-text);
  padding: 0.35rem 0 0.35rem 1rem;
  position: relative;
  letter-spacing: 0.05em;
  font-weight: 300;
}

.service-features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.95rem;
  width: 6px;
  height: 0.5px;
  background: var(--color-accent);
}

@media (max-width: 768px) {
  .service-grid {
    grid-template-columns: 1fr;
  }
  .service-card {
    padding: 2.5rem 2rem;
  }
}

/* ===== Philosophy ===== */
.section-philosophy {
  background: var(--color-bg-dark);
  color: var(--color-bg);
  padding: 6rem 0;
}

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

.philosophy-label {
  font-family: var(--font-sans-en);
  font-size: 0.75rem;
  color: var(--color-accent);
  letter-spacing: 0.4em;
  margin-bottom: 2rem;
}

.philosophy-message {
  font-family: var(--font-serif-ja);
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: 400;
  line-height: 2;
  color: var(--color-bg);
  letter-spacing: 0.1em;
  margin-bottom: 2.5rem;
}

.philosophy-body {
  font-size: 0.9rem;
  line-height: 2.2;
  color: rgba(250, 250, 247, 0.75);
  font-weight: 300;
}

/* ===== Company ===== */
.section-company {
  background: var(--color-bg);
}

.company-table-wrapper {
  max-width: 720px;
  margin: 0 auto;
}

.company-table {
  width: 100%;
  border-collapse: collapse;
}

.company-table th,
.company-table td {
  padding: 1.5rem 1rem;
  text-align: left;
  font-size: 0.9rem;
  line-height: 1.8;
  border-bottom: 0.5px solid var(--color-border);
  vertical-align: top;
}

.company-table th {
  font-family: var(--font-serif-ja);
  font-weight: 500;
  color: var(--color-text);
  width: 30%;
  letter-spacing: 0.1em;
}

.company-table td {
  color: var(--color-text-muted);
  font-weight: 300;
}

.company-table td a {
  color: var(--color-accent-dark);
  border-bottom: 0.5px solid var(--color-accent);
  padding-bottom: 2px;
}

.company-en {
  font-family: var(--font-serif-en);
  font-size: 0.85rem;
  color: var(--color-text-light);
  font-style: italic;
  letter-spacing: 0.05em;
}

@media (max-width: 768px) {
  .company-table th,
  .company-table td {
    display: block;
    width: 100%;
    padding: 0.75rem 0;
  }

  .company-table th {
    padding-top: 1.25rem;
    padding-bottom: 0.25rem;
    border-bottom: none;
  }

  .company-table td {
    padding-bottom: 1.25rem;
  }
}

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

.contact-box {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
  padding: 4rem 2rem;
  background: var(--color-bg);
  border: 0.5px solid var(--color-border);
}

.contact-lead {
  font-size: 0.95rem;
  line-height: 2;
  color: var(--color-text-muted);
  margin-bottom: 2.5rem;
  font-weight: 300;
}

.contact-button {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1.5rem 3rem;
  background: var(--color-bg-dark);
  color: var(--color-bg);
  border: 0.5px solid var(--color-bg-dark);
  transition: background 0.4s ease, color 0.4s ease;
  letter-spacing: 0.1em;
}

.contact-button:hover {
  opacity: 1;
  background: var(--color-bg);
  color: var(--color-bg-dark);
}

.contact-button-label {
  font-family: var(--font-sans-en);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.4em;
  color: var(--color-accent);
}

.contact-button-email {
  font-family: var(--font-sans-en);
  font-size: 1rem;
  font-weight: 300;
  letter-spacing: 0.1em;
}

.contact-note {
  font-size: 0.8rem;
  color: var(--color-text-light);
  margin-top: 2rem;
  font-weight: 300;
}

/* ===== フッター ===== */
.site-footer {
  background: var(--color-bg-dark);
  color: var(--color-bg);
  padding: 5rem 0 2rem;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: 0.5px solid rgba(250, 250, 247, 0.15);
  margin-bottom: 2rem;
}

.footer-logo {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.footer-logo .logo-mark {
  color: var(--color-bg);
  font-size: 1.1rem;
}

.footer-logo .logo-text {
  color: var(--color-bg);
  font-size: 0.75rem;
}

.footer-address {
  font-size: 0.8rem;
  line-height: 2;
  color: rgba(250, 250, 247, 0.7);
  font-weight: 300;
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-nav a {
  font-family: var(--font-sans-en);
  font-size: 0.75rem;
  letter-spacing: 0.25em;
  color: rgba(250, 250, 247, 0.7);
}

.footer-nav a:hover {
  opacity: 1;
  color: var(--color-accent);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.75rem;
  color: rgba(250, 250, 247, 0.5);
  font-weight: 300;
  letter-spacing: 0.05em;
}

.footer-legal {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.footer-legal .sep {
  color: rgba(250, 250, 247, 0.3);
}

@media (max-width: 768px) {
  .footer-inner {
    grid-template-columns: 1fr;
  }
  .footer-nav {
    flex-direction: row;
    gap: 1.5rem;
    flex-wrap: wrap;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
  .section {
    padding: 6rem 0;
  }
  .section-head {
    margin-bottom: 3.5rem;
  }
}

/* ===== スクロールアニメーション ===== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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