/* ============================================================
   DeltaForesight - Corporate Website
   Brand: Soft Slate #4F77A6 / Forest Green #1F7A4D / Grayscale
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  --color-slate: #4F77A6;
  --color-slate-deep: #3B5C82;
  --color-green: #1F7A4D;
  --color-green-deep: #155F3B;
  --color-ink: #1A1F2A;
  --color-text: #2C3340;
  --color-muted: #6B7383;
  --color-line: #E4E7EC;
  --color-line-soft: #EFF1F4;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F7F8FA;
  --color-bg-deep: #0F1620;

  --font-serif: Georgia, "Times New Roman", "ヒラギノ明朝 ProN", "Hiragino Mincho ProN", "游明朝", YuMincho, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "ヒラギノ角ゴ ProN", "Hiragino Kaku Gothic ProN", "游ゴシック", YuGothic, "メイリオ", Meiryo, sans-serif;

  --container: 1120px;
  --radius: 4px;
  --radius-lg: 8px;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 64px;
  --space-8: 96px;
  --space-9: 128px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
h1, h2, h3, h4, p, dl, dd, ul, ol, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img { max-width: 100%; display: block; }
a { color: var(--color-slate); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--color-green); }
em { font-style: normal; color: var(--color-green); }

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

.pc-only { display: inline; }
@media (max-width: 720px) {
  .pc-only { display: none; }
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--color-line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.brand-logo {
  display: block;
  height: 38px;
  width: auto;
  transition: opacity .2s ease;
}
.brand:hover .brand-logo { opacity: 0.8; }

.site-nav {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 13.5px;
  color: var(--color-text);
}
.site-nav a {
  color: var(--color-text);
  letter-spacing: 0.04em;
  position: relative;
}
.site-nav a:hover { color: var(--color-green); }

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-left: 8px;
  padding-left: 16px;
  border-left: 1px solid var(--color-line);
}
.lang-btn {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  background: none;
  border: none;
  color: var(--color-muted);
  cursor: pointer;
  padding: 4px 6px;
  transition: color .2s ease;
}
.lang-btn:hover { color: var(--color-green); }
.lang-btn.is-active {
  color: var(--color-green);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1.5px;
}
.lang-divider {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--color-line);
  font-size: 13px;
}

@media (max-width: 920px) {
  .site-nav > a { display: none; }
  .lang-switch {
    margin-left: 0;
    padding-left: 0;
    border-left: none;
  }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 120px 0 100px;
  background:
    linear-gradient(180deg, #FAFBFC 0%, #FFFFFF 100%);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  top: 80px;
  right: -120px;
  width: 360px;
  height: 360px;
  background: radial-gradient(circle at center, rgba(79, 119, 166, 0.08), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute;
  bottom: -100px;
  left: -80px;
  width: 280px;
  height: 280px;
  background: radial-gradient(circle at center, rgba(31, 122, 77, 0.07), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.eyebrow {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--color-green);
  font-size: 14px;
  letter-spacing: 0.08em;
  margin-bottom: 20px;
}
.hero-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(28px, 4.6vw, 48px);
  line-height: 1.4;
  color: var(--color-ink);
  letter-spacing: 0.01em;
  margin-bottom: 28px;
}
.hero-lead {
  font-size: 16px;
  color: var(--color-text);
  max-width: 720px;
  margin-bottom: 40px;
}
.hero-cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 26px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.03em;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: all .2s ease;
  cursor: pointer;
}
.btn-primary {
  background: var(--color-green);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-green-deep);
  color: #fff;
  transform: translateY(-1px);
}
.btn-ghost {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-line);
}
.btn-ghost:hover {
  border-color: var(--color-green);
  color: var(--color-green);
}

/* ---------- Section base ---------- */
.section {
  padding: 96px 0;
  border-top: 1px solid var(--color-line-soft);
}
.section-eyebrow {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--color-green);
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.section-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1.45;
  color: var(--color-ink);
  margin-bottom: 24px;
  letter-spacing: 0.01em;
}
.section-lead {
  font-size: 15.5px;
  color: var(--color-text);
  max-width: 780px;
  margin-bottom: 56px;
}
.footnote {
  font-size: 13px;
  color: var(--color-muted);
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--color-line-soft);
}

/* ---------- Cards (3-up) ---------- */
.cards {
  display: grid;
  gap: 24px;
}
.cards-3 {
  grid-template-columns: repeat(3, 1fr);
}
@media (max-width: 920px) {
  .cards-3 { grid-template-columns: 1fr; }
}
.card {
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: border-color .2s ease, transform .2s ease;
  position: relative;
}
.card:hover {
  border-color: var(--color-slate);
  transform: translateY(-2px);
}
.card-num {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 14px;
  color: var(--color-green);
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}
.card-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 20px;
  color: var(--color-ink);
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}
.card-text {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--color-text);
}
.card-list {
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--color-text);
}
.card-list li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 4px;
}
.card-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 12px;
  height: 12px;
  border: 1.5px solid var(--color-green);
  border-radius: 50%;
}
.card-list li::after {
  content: "";
  position: absolute;
  left: 3px;
  top: 16px;
  width: 5px;
  height: 3px;
  border-left: 1.5px solid var(--color-green);
  border-bottom: 1.5px solid var(--color-green);
  transform: rotate(-45deg);
}

/* ---------- Section: Mission ---------- */
.section-mission {
  background: var(--color-bg-alt);
}
.section-mission .section-title {
  font-size: clamp(26px, 3.6vw, 38px);
  line-height: 1.5;
  margin-bottom: 32px;
}
.section-mission .section-lead {
  font-size: 16px;
  max-width: 820px;
}

/* ---------- Section: Support ---------- */
.card-support {
  display: flex;
  flex-direction: column;
}
.support-tag {
  display: inline-block;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 12px;
  color: var(--color-slate);
  letter-spacing: 0.1em;
  margin-bottom: 12px;
  text-transform: uppercase;
}
.support-name {
  font-size: 13px;
  color: var(--color-green);
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line-soft);
}
.support-desc {
  font-size: 14px;
  line-height: 1.85;
  color: var(--color-text);
  margin-bottom: 20px;
  flex: 1;
}
.tag-coming {
  display: inline-block;
  margin-top: 12px;
  padding: 4px 10px;
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--color-slate-deep);
  background: rgba(79, 119, 166, 0.08);
  border-radius: 999px;
}
.support-meta {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--color-line-soft);
  font-size: 13px;
}
.support-meta dt {
  color: var(--color-muted);
  margin-bottom: 2px;
  letter-spacing: 0.04em;
}
.support-meta dd {
  margin: 0 0 10px;
  color: var(--color-ink);
  font-weight: 500;
}
.support-meta dd:last-child { margin-bottom: 0; }

/* ---------- Section: Why Us ---------- */
.section-why { background: var(--color-bg-alt); }
.card-why {
  text-align: left;
}
.why-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-green);
  color: #fff;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 16px;
  border-radius: 50%;
  margin-bottom: 16px;
}

/* ---------- Section: Industry Position ---------- */
.position-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 16px;
}
.position-item {
  display: grid;
  grid-template-columns: 60px 1fr auto;
  align-items: center;
  gap: 24px;
  padding: 20px 28px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  background: #fff;
  transition: all .2s ease;
}
.position-item.is-out {
  background: var(--color-bg-alt);
  color: var(--color-muted);
}
.position-item.is-out .position-name { color: var(--color-muted); }
.position-item.is-in {
  background: linear-gradient(180deg, #fff 0%, #F4FAF6 100%);
  border-color: var(--color-green);
  border-width: 2px;
  padding: 24px 28px;
  box-shadow: 0 8px 24px rgba(31, 122, 77, 0.08);
}
.position-num {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 22px;
  color: var(--color-slate);
}
.position-item.is-in .position-num { color: var(--color-green); }
.position-name {
  font-weight: 600;
  font-size: 16px;
  color: var(--color-ink);
  margin-bottom: 4px;
}
.position-desc {
  font-size: 13.5px;
  color: var(--color-muted);
}
.position-badge {
  font-size: 12px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--color-line-soft);
  color: var(--color-muted);
  letter-spacing: 0.05em;
  white-space: nowrap;
}
.position-badge-in {
  background: var(--color-green);
  color: #fff;
  font-weight: 600;
}

@media (max-width: 720px) {
  .position-item {
    grid-template-columns: 40px 1fr;
    gap: 12px;
    padding: 16px 18px;
  }
  .position-item.is-in { padding: 18px 18px; }
  .position-badge {
    grid-column: 1 / -1;
    justify-self: start;
    margin-top: 4px;
  }
}

/* ---------- Section: Representative ---------- */
.section-rep { background: var(--color-bg-alt); }
.rep {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 64px;
  align-items: start;
}
@media (max-width: 920px) {
  .rep { grid-template-columns: 1fr; gap: 32px; }
}
.rep-head {
  position: sticky;
  top: 96px;
  padding: 32px 28px;
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  border-top: 3px solid var(--color-green);
}
.rep-role {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 13px;
  color: var(--color-green);
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}
.rep-name {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 10px;
  line-height: 1.3;
}
.rep-name-en {
  display: block;
  font-size: 15px;
  font-weight: 400;
  color: var(--color-muted);
  font-style: italic;
  margin-top: 4px;
}
.rep-tagline {
  font-size: 13.5px;
  color: var(--color-text);
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-line-soft);
}
.rep-link {
  font-size: 13px;
}
.rep-link a {
  color: var(--color-slate);
  letter-spacing: 0.03em;
}

.career {
  position: relative;
  padding-left: 24px;
}
.career::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 5px;
  width: 1px;
  background: var(--color-line);
}
.career li {
  position: relative;
  padding: 4px 0 32px;
}
.career li::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 14px;
  width: 11px;
  height: 11px;
  background: #fff;
  border: 2px solid var(--color-green);
  border-radius: 50%;
}
.career li:last-child { padding-bottom: 0; }
.career-period {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 13px;
  color: var(--color-slate);
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}
.career-org {
  font-weight: 600;
  font-size: 15.5px;
  color: var(--color-ink);
  margin-bottom: 6px;
  line-height: 1.6;
}
.career-desc {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.8;
}

/* ---------- Section: Company ---------- */
.company-table {
  border-top: 1px solid var(--color-line);
  max-width: 720px;
}
.company-table > div {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--color-line);
  align-items: baseline;
}
@media (max-width: 720px) {
  .company-table > div {
    grid-template-columns: 1fr;
    gap: 4px;
    padding: 18px 0;
  }
}
.company-table dt {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 14px;
  color: var(--color-green);
  letter-spacing: 0.06em;
}
.company-table dd {
  font-size: 15.5px;
  color: var(--color-ink);
  font-weight: 500;
  margin: 0;
}

/* ---------- Section: Contact ---------- */
.section-contact {
  background: var(--color-bg-deep);
  color: #fff;
  border-top: none;
  position: relative;
  overflow: hidden;
}
.section-contact::before {
  content: "";
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(31, 122, 77, 0.18), transparent 60%);
  border-radius: 50%;
  pointer-events: none;
}
.section-contact .section-eyebrow { color: #6FB78F; }
.section-contact .section-title {
  color: #fff;
  font-size: clamp(24px, 3.2vw, 32px);
  line-height: 1.55;
}
.section-contact .section-lead {
  color: rgba(255, 255, 255, 0.7);
}

.contact-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  max-width: 720px;
  position: relative;
  z-index: 2;
}
@media (max-width: 720px) {
  .contact-list { grid-template-columns: 1fr; }
}
.contact-item {
  display: flex;
  flex-direction: column;
  padding: 24px 28px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  color: #fff;
  transition: all .2s ease;
}
.contact-item:hover {
  background: rgba(31, 122, 77, 0.18);
  border-color: var(--color-green);
  color: #fff;
  transform: translateY(-2px);
}
.contact-label {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 12px;
  color: #6FB78F;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
  text-transform: uppercase;
}
.contact-value {
  font-size: 16px;
  font-weight: 500;
  word-break: break-all;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-bg-deep);
  color: rgba(255, 255, 255, 0.6);
  padding: 32px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-brand {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 15px;
  color: rgba(255, 255, 255, 0.85);
  letter-spacing: 0.04em;
}
.footer-copy {
  font-size: 12.5px;
  letter-spacing: 0.03em;
}

/* ---------- Mobile spacing ---------- */
@media (max-width: 720px) {
  .hero { padding: 80px 0 64px; }
  .section { padding: 64px 0; }
  .section-lead { margin-bottom: 40px; }
  .card { padding: 24px 22px; }
}