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

:root {
  --navy: #1a2744;
  --navy-dark: #111c33;
  --navy-light: #243555;
  --accent: #4a90d9;
  --accent-light: #6aabef;
  --gold: #c5a55a;
  --white: #ffffff;
  --gray-50: #f8f9fb;
  --gray-100: #eef1f5;
  --gray-200: #d8dde6;
  --gray-400: #8c95a6;
  --gray-600: #555e6e;
  --gray-800: #2d3440;
  --text: #2d3440;
  --text-light: #555e6e;
  --radius: 8px;
  --shadow: 0 4px 24px rgba(26, 39, 68, 0.08);
  --shadow-lg: 0 8px 40px rgba(26, 39, 68, 0.12);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans JP', 'Inter', -apple-system, sans-serif;
  color: var(--text);
  line-height: 1.8;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

.mt-1 { margin-top: 12px; }

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: transparent;
  transition: background var(--transition), box-shadow var(--transition);
}

.header.scrolled {
  background: rgba(26, 39, 68, 0.97);
  box-shadow: 0 2px 20px rgba(0,0,0,0.15);
  backdrop-filter: blur(8px);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-img {
  height: 28px;
  width: auto;
}

.nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  color: var(--white);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  padding: 8px 16px;
  border-radius: 4px;
  transition: background var(--transition);
  font-family: 'Inter', sans-serif;
}

.nav-link:hover {
  background: rgba(255,255,255,0.12);
}

.nav-link--cta {
  background: var(--accent);
  color: var(--white);
  margin-left: 8px;
}

.nav-link--cta:hover {
  background: var(--accent-light);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 101;
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--white);
  transition: var(--transition);
  border-radius: 2px;
}

.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 ===== */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: url('img/hero.jpg') center/cover no-repeat;
  color: var(--white);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26,39,68,0.88) 0%, rgba(17,28,51,0.75) 100%);
}

.hero-content {
  position: relative;
  text-align: center;
  padding: 0 24px;
}

.hero-sub {
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--accent-light);
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(20px, 3vw, 32px);
  font-weight: 400;
  line-height: 2;
  letter-spacing: 0.04em;
  margin-bottom: 40px;
}

.hero-btn {
  display: inline-block;
  padding: 14px 48px;
  border: 1px solid rgba(255,255,255,0.4);
  color: var(--white);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.1em;
  border-radius: 4px;
  transition: var(--transition);
}

.hero-btn:hover {
  background: var(--white);
  color: var(--navy);
  border-color: var(--white);
}

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

.section--dark {
  background: var(--gray-50);
}

.section--navy {
  background: var(--navy);
  color: var(--white);
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-label {
  display: block;
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.section-header--light .section-label {
  color: var(--accent-light);
}

.section-title {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.section-header--light .section-title {
  color: var(--white);
}

/* ===== Company ===== */
.company-table {
  max-width: 800px;
  margin: 0 auto;
}

.company-row {
  display: flex;
  border-bottom: 1px solid var(--gray-200);
  padding: 24px 0;
}

.company-key {
  width: 140px;
  flex-shrink: 0;
  font-weight: 700;
  font-size: 14px;
  color: var(--navy);
  padding-top: 2px;
}

.company-val {
  flex: 1;
  font-size: 15px;
  color: var(--text);
}

.company-val p { margin-bottom: 2px; }

.company-loc-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--gray-400);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ===== About ===== */
.about-grid {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 48px;
  align-items: start;
  margin-bottom: 64px;
}

.about-img {
  width: 240px;
  height: 240px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid rgba(255,255,255,0.1);
}

.about-name {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--navy-dark);
}

.about-name-en {
  display: block;
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  font-weight: 400;
  color: var(--gray-400);
  letter-spacing: 0.08em;
  margin-top: 2px;
}

.about-role {
  font-size: 14px;
  color: var(--gray-600);
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--gray-200);
}

.about-bio {
  font-size: 14px;
  line-height: 1.9;
  color: var(--text);
  margin-bottom: 12px;
}

/* ===== Timeline ===== */
.timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  padding-left: 120px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 100px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--gray-200);
}

.timeline-item {
  position: relative;
  padding-bottom: 40px;
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-item::before {
  content: '';
  position: absolute;
  left: -24px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--white);
}

.timeline-year {
  position: absolute;
  left: -120px;
  top: 0;
  font-family: 'Inter', sans-serif;
  font-size: 18px;
  font-weight: 700;
  color: var(--navy);
  width: 80px;
  text-align: right;
}

.timeline-content h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 4px;
}

.timeline-role {
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 8px;
}

.timeline-content p:last-child {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.8;
}

/* ===== Service ===== */
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.service-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 36px 28px;
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-100);
  transition: transform var(--transition), box-shadow var(--transition);
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.service-icon {
  width: 48px;
  height: 48px;
  color: var(--accent);
  margin-bottom: 20px;
}

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

.service-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 12px;
}

.service-desc {
  font-size: 14px;
  color: var(--text-light);
  margin-bottom: 20px;
  line-height: 1.8;
}

.service-features {
  list-style: none;
}

.service-features li {
  font-size: 13px;
  color: var(--text);
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
  border-bottom: 1px solid var(--gray-100);
}

.service-features li:last-child { border-bottom: none; }

.service-features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 13px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.5;
}

/* ===== Contact ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 48px;
  align-items: start;
}

.contact-lead {
  font-size: 15px;
  line-height: 2;
  color: rgba(255,255,255,0.85);
  margin-bottom: 32px;
}

.contact-email {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--accent-light);
  font-size: 15px;
}

.contact-email a:hover {
  text-decoration: underline;
}

.contact-form {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  padding: 32px;
}

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

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 6px;
  color: rgba(255,255,255,0.7);
}

.required { color: #e07070; }

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 4px;
  color: var(--white);
  font-size: 14px;
  font-family: inherit;
  transition: border var(--transition);
}

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

.checkbox-group {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: rgba(255,255,255,0.8);
  cursor: pointer;
}

.checkbox input {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
}

.form-btn {
  display: block;
  width: 100%;
  padding: 14px;
  background: var(--accent);
  color: var(--white);
  border: none;
  border-radius: 4px;
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background var(--transition);
  letter-spacing: 0.05em;
}

.form-btn:hover {
  background: var(--accent-light);
}

/* ===== Footer ===== */
.footer {
  background: var(--navy-dark);
  color: rgba(255,255,255,0.6);
  padding: 48px 0 32px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  margin-bottom: 24px;
}

.footer-logo {
  height: 24px;
  opacity: 0.6;
}

.footer-nav {
  display: flex;
  gap: 24px;
}

.footer-nav a {
  font-size: 12px;
  font-family: 'Inter', sans-serif;
  letter-spacing: 0.06em;
  transition: color var(--transition);
}

.footer-nav a:hover {
  color: var(--white);
}

.footer-bottom {
  text-align: center;
  font-size: 12px;
}

/* ===== Privacy Page ===== */
.privacy-page {
  padding: 120px 0 80px;
  min-height: calc(100vh - 200px);
}

.privacy-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 40px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--navy);
}

.privacy-content h2 {
  font-size: 17px;
  font-weight: 700;
  color: var(--navy);
  margin-top: 32px;
  margin-bottom: 12px;
}

.privacy-content p {
  font-size: 14px;
  line-height: 1.9;
  color: var(--text);
  margin-bottom: 8px;
}

.privacy-content ul {
  margin: 8px 0 16px 24px;
  font-size: 14px;
  line-height: 2;
  color: var(--text);
}

.privacy-content a {
  color: var(--accent);
}

.privacy-content a:hover {
  text-decoration: underline;
}

.privacy-date {
  margin-top: 40px;
  font-size: 13px;
  color: var(--gray-400);
}

/* ===== Animations ===== */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* Stagger service cards */
.service-card.fade-up:nth-child(2) { transition-delay: 0.1s; }
.service-card.fade-up:nth-child(3) { transition-delay: 0.2s; }

/* Timeline stagger */
.timeline-item.fade-up:nth-child(2) { transition-delay: 0.1s; }
.timeline-item.fade-up:nth-child(3) { transition-delay: 0.2s; }
.timeline-item.fade-up:nth-child(4) { transition-delay: 0.3s; }

/* ===== Responsive - Tablet ===== */
@media (max-width: 768px) {
  .hamburger { display: flex; }

  /* Full-screen overlay nav */
  .nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100vh;
    height: 100dvh;
    background: rgba(17, 28, 51, 0.97);
    backdrop-filter: blur(12px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 8px;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition);
  }

  .nav.open {
    opacity: 1;
    pointer-events: auto;
  }

  .nav-link {
    width: auto;
    padding: 16px 32px;
    font-size: 17px;
    letter-spacing: 0.12em;
    text-align: center;
  }

  .nav-link--cta {
    margin-left: 0;
    margin-top: 16px;
    padding: 14px 48px;
    font-size: 15px;
    border-radius: 6px;
  }

  /* Hero */
  .hero { min-height: 100vh; min-height: 100dvh; }
  .hero-title { font-size: 18px; line-height: 2.2; }
  .hero-sub { margin-bottom: 20px; }
  .hero-btn { padding: 14px 40px; font-size: 13px; }

  /* Sections */
  .section { padding: 64px 0; }
  .section-header { margin-bottom: 40px; }
  .section-title { font-size: 22px; }
  .section-label { font-size: 12px; }

  /* Company */
  .company-row {
    flex-direction: column;
    gap: 6px;
    padding: 20px 0;
  }
  .company-key {
    width: auto;
    font-size: 12px;
    color: var(--accent);
    letter-spacing: 0.05em;
  }
  .company-val { font-size: 14px; }

  /* About */
  .about-grid {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
    gap: 28px;
  }
  .about-img { width: 160px; height: 160px; }
  .about-name { font-size: 20px; }
  .about-name-en { font-size: 12px; }
  .about-role { font-size: 13px; margin-bottom: 16px; padding-bottom: 16px; }
  .about-bio { text-align: left; font-size: 13px; line-height: 1.85; margin-bottom: 10px; }

  /* Timeline */
  .timeline {
    padding-left: 0;
    margin-top: 48px;
  }
  .timeline::before {
    left: 16px;
  }
  .timeline-item {
    padding-left: 44px;
    padding-bottom: 32px;
  }
  .timeline-item::before {
    left: 12px;
    top: 4px;
    width: 10px;
    height: 10px;
  }
  .timeline-year {
    position: static;
    width: auto;
    text-align: left;
    font-size: 13px;
    color: var(--accent);
    margin-bottom: 4px;
  }
  .timeline-content h4 { font-size: 15px; }
  .timeline-role { font-size: 12px; }
  .timeline-content p:last-child { font-size: 13px; line-height: 1.75; }

  /* Service */
  .service-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .service-card {
    padding: 28px 24px;
  }
  .service-icon { width: 40px; height: 40px; margin-bottom: 16px; }
  .service-title { font-size: 16px; }
  .service-desc { font-size: 13px; margin-bottom: 16px; }
  .service-features li { font-size: 13px; padding: 8px 0 8px 20px; }

  /* Contact */
  .contact-grid { grid-template-columns: 1fr; gap: 32px; }
  .contact-lead { font-size: 14px; margin-bottom: 20px; }
  .contact-form { padding: 24px 20px; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .form-group input,
  .form-group textarea {
    padding: 12px 14px;
    font-size: 16px; /* prevent iOS zoom */
  }
  .form-btn {
    padding: 16px;
    font-size: 15px;
  }
  .checkbox-group { gap: 16px; }
  .checkbox { font-size: 14px; padding: 4px 0; }
  .checkbox input { width: 20px; height: 20px; }

  /* Footer */
  .footer { padding: 40px 0 28px; }
  .footer-top {
    flex-direction: column;
    gap: 20px;
    align-items: center;
  }
  .footer-nav {
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px 20px;
  }
  .footer-nav a { font-size: 11px; }
  .footer-bottom { font-size: 11px; }

  /* Privacy */
  .privacy-page { padding: 90px 0 60px; }
  .privacy-title { font-size: 22px; margin-bottom: 28px; }
}

/* ===== Responsive - Small SP ===== */
@media (max-width: 480px) {
  .container { padding: 0 20px; }
  .header-inner { height: 60px; padding: 0 16px; }
  .logo-img { height: 22px; }

  .hero-sub { font-size: 11px; letter-spacing: 0.15em; }
  .hero-title { font-size: 16px; line-height: 2.1; }
  .hero-btn { padding: 12px 36px; }

  .section { padding: 52px 0; }
  .section-header { margin-bottom: 32px; }
  .section-title { font-size: 20px; }

  .about-img { width: 140px; height: 140px; }
  .about-name { font-size: 18px; }

  .company-val { font-size: 13px; }

  .contact-form { padding: 20px 16px; }
}