/* =============================================
   CSS Variables & Reset
   ============================================= */
:root {
  --color-bg:        #fafaf8;
  --color-surface:   #ffffff;
  --color-border:    #e8e5de;
  --color-text:      #1c1c1c;
  --color-text-mid:  #555550;
  --color-text-soft: #888882;
  --color-accent:    #2a5caa;
  --color-accent-dk: #1d4280;
  --color-accent-bg: #eef2fb;
  --color-success:   #2d7a4f;
  --color-error:     #c0392b;

  --font-serif:  'DM Serif Display', 'Noto Serif JP', serif;
  --font-sans:   'Noto Sans JP', sans-serif;

  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  16px;

  --transition: 0.25s ease;

  --max-w:         1100px;
  --max-w-narrow:  680px;
  --header-h:      68px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }

/* =============================================
   Utility
   ============================================= */
.container {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 60px);
}
.container--narrow {
  max-width: var(--max-w-narrow);
}

.section {
  padding-block: clamp(64px, 10vw, 112px);
}

.section-header {
  text-align: center;
  margin-bottom: clamp(40px, 6vw, 64px);
}

.section-label {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 400;
  line-height: 1.3;
  color: var(--color-text);
  margin-bottom: 14px;
}

.section-desc {
  font-size: 15px;
  color: var(--color-text-mid);
  max-width: 520px;
  margin-inline: auto;
}

.sp-only { display: none; }

/* =============================================
   Fade-in 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);
}

/* =============================================
   Buttons
   ============================================= */
.btn {
  display: inline-block;
  padding: 13px 32px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
  transition: var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border: 2px solid var(--color-accent);
}
.btn-primary:hover {
  background: var(--color-accent-dk);
  border-color: var(--color-accent-dk);
}
.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
}
.btn-outline:hover {
  background: var(--color-accent-bg);
}
.btn-full { width: 100%; text-align: center; padding-block: 15px; }

/* =============================================
   Header / Nav
   ============================================= */
#header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(250, 250, 248, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s;
}
#header.scrolled {
  border-bottom-color: var(--color-border);
}

.nav-container {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 60px);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.logo-en {
  font-family: var(--font-serif);
  font-size: 20px;
  letter-spacing: 0.02em;
  color: var(--color-text);
}
.logo-ja {
  font-size: 10px;
  color: var(--color-text-soft);
  letter-spacing: 0.08em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-links li a {
  padding: 8px 14px;
  font-size: 14px;
  color: var(--color-text-mid);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.nav-links li a:hover {
  color: var(--color-text);
  background: var(--color-accent-bg);
}
.nav-cta {
  background: var(--color-accent) !important;
  color: #fff !important;
  padding: 8px 20px !important;
}
.nav-cta:hover {
  background: var(--color-accent-dk) !important;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =============================================
   Hero
   ============================================= */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: var(--header-h);
  padding-inline: clamp(20px, 5vw, 60px);
  position: relative;
  overflow: hidden;
  max-width: var(--max-w);
  margin-inline: auto;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 620px;
  padding-block: 60px;
}

.hero-eyebrow {
  font-family: var(--font-serif);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 20px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(38px, 6.5vw, 68px);
  font-weight: 400;
  line-height: 1.25;
  color: var(--color-text);
  margin-bottom: 24px;
}

.hero-sub {
  font-size: clamp(14px, 1.5vw, 16px);
  color: var(--color-text-mid);
  line-height: 1.85;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* Decorative elements */
.hero-deco {
  position: absolute;
  right: -20px;
  top: 50%;
  transform: translateY(-50%);
  width: 420px;
  height: 420px;
  pointer-events: none;
}
.deco-line {
  position: absolute;
  background: var(--color-border);
}
.deco-line--1 {
  width: 1px;
  height: 260px;
  right: 120px;
  top: 80px;
}
.deco-line--2 {
  width: 260px;
  height: 1px;
  right: -20px;
  top: 200px;
}
.deco-circle {
  position: absolute;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
}

/* =============================================
   Appeal
   ============================================= */
.appeal {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding-block: clamp(48px, 7vw, 72px);
}

.appeal-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}

.appeal-item {
  padding: 28px 32px;
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.appeal-item:last-child { border-right: none; }

.appeal-icon {
  color: var(--color-accent);
  display: flex;
  align-items: center;
}

.appeal-item strong {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: 0.02em;
}

.appeal-item p {
  font-size: 13px;
  color: var(--color-text-mid);
  line-height: 1.7;
}

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

.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.service-card {
  background: var(--color-surface);
  padding: 40px 36px;
  transition: var(--transition);
}
.service-card:hover {
  background: var(--color-accent-bg);
}

.service-num {
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--color-accent);
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.service-card h3 {
  font-size: 18px;
  font-weight: 500;
  margin-bottom: 10px;
  color: var(--color-text);
}

.service-card p {
  font-size: 14px;
  color: var(--color-text-mid);
  line-height: 1.75;
}

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

.about-layout {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 64px;
  align-items: start;
}

.about-message h3 {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 400;
  margin-bottom: 16px;
  color: var(--color-text);
}
.about-message p {
  font-size: 14px;
  color: var(--color-text-mid);
  line-height: 1.9;
}

.about-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.about-table th,
.about-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
  line-height: 1.7;
}
.about-table th {
  width: 30%;
  color: var(--color-text-soft);
  font-weight: 400;
  white-space: nowrap;
}
.about-table td {
  color: var(--color-text);
}

/* =============================================
   Careers
   ============================================= */
.careers { background: var(--color-bg); }

.careers-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.career-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: var(--transition);
}
.career-card:hover {
  box-shadow: 0 4px 20px rgba(42, 92, 170, 0.08);
  transform: translateY(-2px);
}

.career-tag {
  display: inline-block;
  padding: 3px 10px;
  background: var(--color-accent-bg);
  color: var(--color-accent);
  font-size: 11px;
  border-radius: 2px;
  letter-spacing: 0.04em;
  align-self: flex-start;
}

.career-card h3 {
  font-size: 17px;
  font-weight: 500;
  color: var(--color-text);
}

.career-card p {
  font-size: 13px;
  color: var(--color-text-mid);
  line-height: 1.7;
  flex: 1;
}

.career-link {
  font-size: 13px;
  color: var(--color-accent);
  font-weight: 500;
  transition: var(--transition);
}
.career-link:hover { color: var(--color-accent-dk); }

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

.contact-form {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: clamp(28px, 5vw, 48px);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 18px;
}

.form-group label {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text);
}

.required {
  font-size: 11px;
  color: var(--color-error);
  background: #fef0ef;
  padding: 1px 6px;
  border-radius: 2px;
  margin-left: 6px;
  vertical-align: middle;
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 11px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font: inherit;
  font-size: 14px;
  color: var(--color-text);
  background: var(--color-surface);
  transition: var(--transition);
  outline: none;
  width: 100%;
}
.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-soft);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(42, 92, 170, 0.1);
}
.form-group input.error,
.form-group textarea.error {
  border-color: var(--color-error);
}
.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-error {
  font-size: 12px;
  color: var(--color-error);
  min-height: 16px;
}

.form-submit { margin-top: 8px; }

.form-success {
  display: none;
  align-items: center;
  gap: 10px;
  margin-top: 16px;
  padding: 14px 18px;
  background: #edfaf3;
  border: 1px solid #b7e8cb;
  border-radius: var(--radius-sm);
  color: var(--color-success);
  font-size: 14px;
}
.form-success.visible { display: flex; }

/* =============================================
   Footer
   ============================================= */
.footer {
  background: var(--color-text);
  color: rgba(255,255,255,0.6);
  padding-block: 48px 28px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  margin-bottom: 24px;
}

.footer-brand .logo-en {
  font-family: var(--font-serif);
  font-size: 18px;
  color: #fff;
}
.footer-brand .logo-ja {
  font-size: 10px;
  color: rgba(255,255,255,0.45);
  letter-spacing: 0.08em;
}
.footer-brand p {
  font-size: 13px;
  margin-top: 10px;
  line-height: 1.7;
  max-width: 280px;
}

.footer-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 8px;
  justify-content: flex-end;
}
.footer-nav a {
  font-size: 13px;
  color: rgba(255,255,255,0.55);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.footer-nav a:hover { color: #fff; }

.footer-bottom small {
  font-size: 12px;
  color: rgba(255,255,255,0.35);
}

/* =============================================
   Responsive
   ============================================= */
@media (max-width: 900px) {
  .appeal-list {
    grid-template-columns: repeat(2, 1fr);
  }
  .appeal-item:nth-child(2) { border-right: none; }
  .appeal-item:nth-child(1),
  .appeal-item:nth-child(2) { border-bottom: 1px solid var(--color-border); }

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

  .about-layout { grid-template-columns: 1fr; gap: 36px; }

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

  .hero-deco { display: none; }
}

@media (max-width: 700px) {
  .sp-only { display: inline; }

  .hamburger { display: flex; }

  .nav-links {
    position: fixed;
    top: var(--header-h);
    left: 0; right: 0;
    background: var(--color-surface);
    flex-direction: column;
    align-items: stretch;
    padding: 16px 20px 24px;
    border-bottom: 1px solid var(--color-border);
    gap: 2px;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s ease, opacity 0.3s ease;
    z-index: 99;
  }
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-links li a {
    display: block;
    padding: 12px 16px;
    font-size: 15px;
  }
  .nav-cta {
    text-align: center;
    margin-top: 8px;
    border-radius: var(--radius-sm) !important;
  }

  .appeal-list { grid-template-columns: 1fr; }
  .appeal-item { border-right: none !important; border-bottom: 1px solid var(--color-border); }
  .appeal-item:last-child { border-bottom: none; }

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

  .form-row { grid-template-columns: 1fr; }

  .footer-top { flex-direction: column; }
  .footer-nav ul { justify-content: flex-start; }
}