/* =========================================================
   Yusumi（湯澄）ブランドサイト共通スタイル
   ========================================================= */

:root {
  /* Background */
  --color-primary: #070e1f;        /* Midnight Navy */
  --color-secondary: #0d1b3e;      /* Deep Navy */
  --color-surface: #111827;        /* Navy Surface */

  /* Accent */
  --color-accent: #c9a84c;         /* Antique Gold */
  --color-accent-soft: rgba(201, 168, 76, 0.4);

  /* Text */
  --color-text-primary: #ffffff;
  --color-text-secondary: #e8e0d0; /* Warm Cream */
  --color-text-muted: #6b7280;

  /* Layout */
  --max-width: 1200px;
  --header-height: 80px;
}

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

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

body {
  background-color: var(--color-primary);
  color: var(--color-text-secondary);
  font-family: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 300;
  line-height: 1.85;
  letter-spacing: 0.04em;
  overflow-x: hidden;
  min-height: 100vh;
}

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

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

a:hover {
  color: var(--color-accent);
}

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

ul, ol {
  list-style: none;
}

/* ----- Typography ------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Cormorant Garamond', 'Noto Serif JP', serif;
  font-weight: 300;
  color: var(--color-text-primary);
  line-height: 1.4;
  letter-spacing: 0.06em;
}

.serif-jp {
  font-family: 'Noto Serif JP', serif;
  font-weight: 300;
}

.eyebrow {
  display: inline-block;
  font-family: 'Cormorant Garamond', serif;
  font-style: italic;
  font-size: 0.85rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1.5rem;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  margin-bottom: 1.5rem;
}

.section-title-jp {
  font-family: 'Noto Serif JP', serif;
  font-weight: 300;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  letter-spacing: 0.2em;
  margin-bottom: 2.5rem;
  color: var(--color-text-primary);
}

p {
  font-size: 1rem;
  margin-bottom: 1.4rem;
}

p:last-child {
  margin-bottom: 0;
}

/* ----- Layout ----------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.container-narrow {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: clamp(80px, 12vw, 140px) 0;
}

.divider {
  display: block;
  width: 60px;
  height: 1px;
  background-color: var(--color-accent);
  margin: 2rem auto;
}

.divider-left {
  margin: 2rem 0;
}

/* ----- Header ----------------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  display: flex;
  align-items: center;
  background-color: transparent;
  transition: background-color 0.4s ease, backdrop-filter 0.4s ease;
}

.site-header.scrolled {
  background-color: rgba(7, 14, 31, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.site-logo a {
  display: flex;
  align-items: center;
  gap: 12px;
}

.site-logo img {
  height: 44px;
  width: auto;
}

.site-logo .logo-text {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.4rem;
  letter-spacing: 0.3em;
  color: var(--color-text-primary);
  text-transform: uppercase;
}

.main-nav ul {
  display: flex;
  gap: 2.4rem;
  align-items: center;
}

.main-nav a {
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  color: var(--color-text-secondary);
  position: relative;
  padding: 4px 0;
}

.main-nav a::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 0;
  height: 1px;
  background: var(--color-accent);
  transition: all 0.3s ease;
  transform: translateX(-50%);
}

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

.main-nav .nav-cta {
  border: 1px solid var(--color-accent-soft);
  padding: 8px 18px;
  color: var(--color-accent);
  letter-spacing: 0.2em;
}

.main-nav .nav-cta:hover {
  background: var(--color-accent);
  color: var(--color-primary);
}

.main-nav .nav-cta::after {
  display: none;
}

/* Hamburger */
.menu-toggle {
  display: none;
  width: 32px;
  height: 32px;
  position: relative;
  z-index: 110;
}

.menu-toggle span {
  display: block;
  position: absolute;
  left: 4px;
  width: 24px;
  height: 1px;
  background: var(--color-text-primary);
  transition: all 0.3s ease;
}

.menu-toggle span:nth-child(1) { top: 11px; }
.menu-toggle span:nth-child(2) { top: 16px; }
.menu-toggle span:nth-child(3) { top: 21px; }

.menu-toggle.open span:nth-child(1) {
  transform: rotate(45deg);
  top: 16px;
}
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) {
  transform: rotate(-45deg);
  top: 16px;
}

/* ----- Hero ------------------------------------------------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--header-height) 24px 80px;
  overflow: hidden;
  background:
    radial-gradient(ellipse at top, rgba(13, 27, 62, 0.6) 0%, transparent 60%),
    radial-gradient(ellipse at bottom, rgba(201, 168, 76, 0.08) 0%, transparent 70%),
    linear-gradient(180deg, var(--color-primary) 0%, var(--color-secondary) 100%);
}

/* Decorative concentric ripples (SVG-free, pure CSS) */
.hero::before,
.hero::after {
  content: '';
  position: absolute;
  border: 1px solid rgba(201, 168, 76, 0.12);
  border-radius: 50%;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.hero::before {
  width: 480px;
  height: 480px;
}

.hero::after {
  width: 760px;
  height: 760px;
  border-color: rgba(201, 168, 76, 0.06);
}

.hero-inner {
  position: relative;
  text-align: center;
  z-index: 2;
  max-width: 720px;
}

.hero-eyebrow {
  font-family: 'Cormorant Garamond', serif;
  font-style: italic;
  font-size: 1rem;
  letter-spacing: 0.5em;
  color: var(--color-accent);
  margin-bottom: 2.5rem;
  text-transform: uppercase;
}

.hero-title {
  font-family: 'Noto Serif JP', serif;
  font-weight: 300;
  font-size: clamp(1.8rem, 5vw, 3rem);
  letter-spacing: 0.25em;
  line-height: 1.7;
  color: var(--color-text-primary);
  margin-bottom: 2rem;
}

.hero-title .accent {
  color: var(--color-accent);
}

.hero-subtitle {
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(1.4rem, 3vw, 2rem);
  letter-spacing: 0.3em;
  color: var(--color-text-secondary);
  margin-bottom: 3rem;
  text-transform: uppercase;
  font-weight: 300;
}

.hero-text {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.1em;
  line-height: 2.2;
  margin: 0 auto;
  max-width: 520px;
}

.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.7rem;
  letter-spacing: 0.4em;
  color: var(--color-text-muted);
  text-transform: uppercase;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.hero-scroll .line {
  width: 1px;
  height: 40px;
  background: linear-gradient(180deg, var(--color-accent), transparent);
  animation: scrollLine 2.4s ease-in-out infinite;
}

@keyframes scrollLine {
  0%, 100% { opacity: 0.3; transform: scaleY(0.6); }
  50%      { opacity: 1;   transform: scaleY(1); }
}

/* ----- Section: Concept ------------------------------------- */
.section-concept {
  background-color: var(--color-primary);
  text-align: center;
}

.section-concept .container-narrow p {
  font-size: 1rem;
  line-height: 2.2;
  color: var(--color-text-secondary);
}

/* ----- Section: Three Pillars ------------------------------- */
.section-pillars {
  background-color: var(--color-secondary);
  position: relative;
}

.section-pillars::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 1px;
  height: 60px;
  background: linear-gradient(180deg, transparent, var(--color-accent));
}

.pillars-header {
  text-align: center;
  margin-bottom: 5rem;
}

.pillars-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.pillar-card {
  background-color: var(--color-surface);
  padding: 3rem 2rem;
  border: 1px solid rgba(255, 255, 255, 0.04);
  text-align: center;
  transition: transform 0.4s ease, border-color 0.4s ease;
}

.pillar-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent-soft);
}

.pillar-number {
  font-family: 'Cormorant Garamond', serif;
  font-style: italic;
  font-size: 0.9rem;
  letter-spacing: 0.3em;
  color: var(--color-accent);
  margin-bottom: 1.5rem;
}

.pillar-title-en {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.6rem;
  letter-spacing: 0.2em;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

.pillar-title-jp {
  font-family: 'Noto Serif JP', serif;
  font-size: 1rem;
  letter-spacing: 0.3em;
  color: var(--color-accent);
  margin-bottom: 1.5rem;
}

.pillar-line {
  width: 30px;
  height: 1px;
  background: var(--color-accent);
  margin: 0 auto 1.5rem;
}

.pillar-card p {
  font-size: 0.9rem;
  line-height: 2;
  color: var(--color-text-secondary);
}

/* ----- Section: Coming Soon --------------------------------- */
.section-coming-soon {
  background-color: var(--color-primary);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.section-coming-soon::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  border: 1px solid rgba(201, 168, 76, 0.06);
  border-radius: 50%;
  pointer-events: none;
}

.coming-soon-inner {
  position: relative;
  z-index: 2;
}

.coming-soon-label {
  font-family: 'Cormorant Garamond', serif;
  font-style: italic;
  font-size: 1rem;
  letter-spacing: 0.5em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 2rem;
}

.coming-soon-title {
  font-family: 'Cormorant Garamond', serif;
  font-weight: 300;
  font-size: clamp(2.4rem, 6vw, 4rem);
  letter-spacing: 0.15em;
  color: var(--color-text-primary);
  margin-bottom: 1rem;
  text-transform: uppercase;
}

.coming-soon-jp {
  font-family: 'Noto Serif JP', serif;
  font-size: 1rem;
  letter-spacing: 0.4em;
  color: var(--color-text-secondary);
  margin-bottom: 3rem;
}

.coming-soon-text {
  max-width: 520px;
  margin: 0 auto;
  font-size: 0.95rem;
  line-height: 2.2;
  color: var(--color-text-secondary);
}

/* ----- Page Hero (sub pages) -------------------------------- */
.page-hero {
  padding: calc(var(--header-height) + 80px) 24px 60px;
  text-align: center;
  background:
    radial-gradient(ellipse at top, rgba(13, 27, 62, 0.6) 0%, transparent 70%),
    var(--color-primary);
}

.page-hero .eyebrow {
  margin-bottom: 1rem;
}

.page-hero h1 {
  font-family: 'Noto Serif JP', serif;
  font-weight: 300;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  letter-spacing: 0.25em;
  margin-bottom: 1rem;
}

.page-hero .subtitle {
  font-family: 'Cormorant Garamond', serif;
  font-style: italic;
  font-size: 1rem;
  letter-spacing: 0.3em;
  color: var(--color-text-muted);
  text-transform: uppercase;
}

/* ----- Article (long-form) ---------------------------------- */
.article {
  padding: 60px 0 120px;
}

.article h2 {
  font-family: 'Noto Serif JP', serif;
  font-weight: 300;
  font-size: clamp(1.3rem, 2.6vw, 1.7rem);
  letter-spacing: 0.2em;
  color: var(--color-text-primary);
  margin: 4rem 0 1.5rem;
  position: relative;
  padding-left: 18px;
}

.article h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 24px;
  background: var(--color-accent);
}

.article h2:first-child {
  margin-top: 0;
}

.article p {
  font-size: 1rem;
  line-height: 2.2;
  color: var(--color-text-secondary);
}

.article .lead {
  font-family: 'Noto Serif JP', serif;
  font-size: 1.1rem;
  line-height: 2.4;
  color: var(--color-text-primary);
  margin-bottom: 3rem;
}

/* ----- Pillar Detail (concept page) ------------------------- */
.pillar-detail {
  margin: 3rem 0;
  padding: 2.5rem;
  background-color: var(--color-secondary);
  border-left: 2px solid var(--color-accent);
}

.pillar-detail h3 {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.4rem;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

.pillar-detail .ja {
  font-family: 'Noto Serif JP', serif;
  font-size: 0.95rem;
  letter-spacing: 0.3em;
  color: var(--color-text-primary);
  margin-bottom: 1.5rem;
}

/* ----- Contact / Form --------------------------------------- */
.contact-section {
  padding: 60px 0 120px;
}

.contact-intro {
  text-align: center;
  margin-bottom: 4rem;
}

.contact-intro p {
  font-size: 0.95rem;
  line-height: 2.2;
  color: var(--color-text-secondary);
}

.contact-form {
  max-width: 640px;
  margin: 0 auto;
  background-color: var(--color-secondary);
  padding: 3rem;
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.form-group {
  margin-bottom: 1.8rem;
}

.form-group label {
  display: block;
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  color: var(--color-text-secondary);
  margin-bottom: 0.6rem;
}

.form-group label .required {
  color: var(--color-accent);
  margin-left: 4px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 14px 16px;
  background-color: var(--color-primary);
  color: var(--color-text-primary);
  border: 1px solid rgba(255, 255, 255, 0.1);
  font-family: inherit;
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-accent);
}

.form-group textarea {
  resize: vertical;
  min-height: 160px;
  line-height: 1.8;
}

.form-submit {
  width: 100%;
  padding: 16px 24px;
  background: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  font-family: 'Cormorant Garamond', serif;
  font-size: 1rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  transition: all 0.3s ease;
  margin-top: 1rem;
}

.form-submit:hover {
  background: var(--color-accent);
  color: var(--color-primary);
}

.form-note {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 2rem;
  text-align: center;
  letter-spacing: 0.05em;
}

/* ----- Footer ----------------------------------------------- */
.site-footer {
  background-color: var(--color-primary);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding: 80px 0 40px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  margin-bottom: 4rem;
}

.footer-brand img {
  height: 60px;
  margin-bottom: 1.5rem;
}

.footer-brand .brand-name {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.4rem;
  letter-spacing: 0.3em;
  color: var(--color-text-primary);
  margin-bottom: 0.6rem;
  text-transform: uppercase;
}

.footer-brand .brand-tagline {
  font-family: 'Noto Serif JP', serif;
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  color: var(--color-text-secondary);
  line-height: 2;
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.footer-nav h4 {
  font-family: 'Cormorant Garamond', serif;
  font-style: italic;
  font-size: 0.9rem;
  letter-spacing: 0.3em;
  color: var(--color-accent);
  margin-bottom: 0.6rem;
  text-transform: uppercase;
  font-weight: 300;
}

.footer-nav a {
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary);
}

.footer-nav .muted {
  color: var(--color-text-muted);
  cursor: default;
  font-size: 0.8rem;
}

.footer-nav .muted::after {
  content: '（準備中）';
  font-size: 0.75rem;
  margin-left: 6px;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-bottom .copyright {
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  color: var(--color-text-muted);
  text-transform: uppercase;
}

.social-links {
  display: flex;
  gap: 1.2rem;
  align-items: center;
}

.social-links a {
  width: 36px;
  height: 36px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.social-links a:hover {
  border-color: var(--color-accent);
  background: var(--color-accent);
}

.social-links svg {
  width: 14px;
  height: 14px;
  fill: var(--color-text-secondary);
  transition: fill 0.3s ease;
}

.social-links a:hover svg {
  fill: var(--color-primary);
}

/* ----- Fade-in Animation ------------------------------------ */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 1s ease, transform 1s ease;
}

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

/* ----- Responsive ------------------------------------------- */
@media (max-width: 900px) {
  .pillars-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }

  .main-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background-color: var(--color-primary);
    border-left: 1px solid rgba(255, 255, 255, 0.05);
    padding: 100px 32px 40px;
    transition: right 0.4s ease;
    z-index: 105;
  }

  .main-nav.open {
    right: 0;
  }

  .main-nav ul {
    flex-direction: column;
    gap: 2rem;
    align-items: flex-start;
  }

  .main-nav a {
    font-size: 1rem;
  }

  .main-nav .nav-cta {
    align-self: flex-start;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .contact-form {
    padding: 2rem 1.5rem;
  }

  .pillar-detail {
    padding: 1.8rem 1.5rem;
  }

  .hero::before {
    width: 320px;
    height: 320px;
  }

  .hero::after {
    width: 480px;
    height: 480px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    letter-spacing: 0.15em;
  }

  .site-logo .logo-text {
    display: none;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

  .fade-in {
    opacity: 1;
    transform: none;
  }
}