/* ==========================================================================
   NORTH STEEL株式会社 コーポレートサイト スタイルシート
   ========================================================================== */

:root {
  --color-navy: #0b1e33;
  --color-navy-light: #12293f;
  --color-gray: #f4f5f7;
  --color-gray-dark: #4a4f57;
  --color-accent: #d98c2b;
  --color-accent-blue: #7fa8d4;
  --color-white: #ffffff;
  --font-jp: "Noto Sans JP", sans-serif;
  --font-jp-serif: "Noto Serif JP", "Yu Mincho", "YuMincho", serif;
  --font-en: "Oswald", sans-serif;
  --header-height: 76px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-jp);
  color: var(--color-gray-dark);
  line-height: 1.8;
  background: var(--color-white);
}

a {
  color: inherit;
  text-decoration: none;
}

ul, dl {
  list-style: none;
}

img, svg {
  max-width: 100%;
  display: block;
}

.section-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 96px 24px;
}

.section-eyebrow {
  font-family: var(--font-en);
  color: var(--color-accent);
  letter-spacing: 0.2em;
  font-weight: 500;
  margin-bottom: 8px;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-navy);
  margin-bottom: 48px;
}

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(11, 30, 51, 0.95);
  z-index: 1000;
  transition: background 0.3s ease, backdrop-filter 0.3s ease;
}

.site-header.scrolled {
  background: rgba(11, 30, 51, 0.85);
  backdrop-filter: blur(8px);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-mark {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.logo-text {
  font-family: var(--font-en);
  color: var(--color-white);
  font-size: 1.3rem;
  letter-spacing: 0.05em;
}

.site-nav {
  display: flex;
  gap: 32px;
}

.nav-link {
  color: var(--color-white);
  font-size: 0.95rem;
  position: relative;
  padding: 4px 0;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width 0.25s ease;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-white);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  height: 100vh;
  min-height: 560px;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg svg {
  width: 100%;
  height: 100%;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
  color: var(--color-white);
}

.hero-eyebrow {
  font-family: var(--font-en);
  color: var(--color-accent-blue);
  letter-spacing: 0.25em;
  margin-bottom: 16px;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.35);
}

.hero-title {
  font-family: var(--font-jp-serif);
  font-size: 2.6rem;
  font-weight: 900;
  line-height: 1.5;
  margin-bottom: 24px;
  color: var(--color-white);
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.45);
}

.hero-lead {
  font-family: var(--font-jp-serif);
  font-weight: 500;
  font-size: 1.05rem;
  line-height: 2;
  margin-bottom: 32px;
  opacity: 0.92;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
}

.hero-values {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.hero-values li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 18px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 4px;
  background: rgba(11, 30, 51, 0.35);
}

.hero-value-word {
  font-family: var(--font-jp-serif);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.hero-value-note {
  font-family: var(--font-jp-serif);
  font-size: 0.8rem;
  color: var(--color-accent-blue);
}

.hero-business {
  font-size: 0.95rem;
  opacity: 0.9;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
}

.hero-content .btn-primary {
  margin-top: 2em;
}

.btn {
  display: inline-block;
  padding: 16px 40px;
  border-radius: 4px;
  font-weight: 700;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-white);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(217, 140, 43, 0.35);
}

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

.about-text p {
  margin-bottom: 20px;
}

.about-side {
  display: grid;
  gap: 32px;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.about-safety {
  background: var(--color-gray);
  border-left: 4px solid var(--color-accent);
  border-radius: 8px;
  padding: 28px 24px;
}

.about-safety-title {
  font-family: var(--font-jp-serif);
  font-size: 1.35rem;
  font-weight: 900;
  color: var(--color-navy);
  margin-bottom: 12px;
}

.about-safety-sub {
  font-family: var(--font-jp-serif);
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.7;
  margin-bottom: 16px;
}

.about-safety-body {
  font-size: 0.92rem;
  color: var(--color-gray-dark);
  line-height: 1.9;
}

.about-stats li {
  background: var(--color-gray);
  border-radius: 8px;
  padding: 28px 16px;
  text-align: center;
}

.stat-number {
  display: block;
  font-family: var(--font-en);
  font-size: 1.5rem;
  color: var(--color-navy);
  font-weight: 700;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--color-gray-dark);
}

/* ---------- Business ---------- */
.business {
  background: var(--color-gray);
}

.business-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.business-card {
  background: var(--color-white);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 6px 20px rgba(11, 30, 51, 0.06);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.business-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 14px 32px rgba(11, 30, 51, 0.12);
}

.business-visual {
  width: 100%;
  aspect-ratio: 200 / 140;
}

.business-card h3 {
  color: var(--color-navy);
  font-size: 1.15rem;
  margin: 20px 24px 12px;
}

.business-card p {
  font-size: 0.9rem;
  margin: 0 24px 24px;
}

/* ---------- Company ---------- */
.company-list {
  border-top: 1px solid #e2e4e8;
}

.company-row {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid #e2e4e8;
}

.company-row dt {
  color: var(--color-navy);
  font-weight: 700;
}

.business-list li {
  list-style: disc;
  margin-left: 1.2em;
  margin-bottom: 6px;
}

.business-list li::marker {
  color: var(--color-accent);
}

/* ---------- Contact Form ---------- */
.contact {
  background: var(--color-gray);
}

.contact-form {
  max-width: 640px;
  margin: 0 auto;
  background: var(--color-white);
  padding: 48px;
  border-radius: 10px;
  box-shadow: 0 6px 20px rgba(11, 30, 51, 0.06);
}

.honeypot {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--color-navy);
}

.required {
  color: #c0392b;
  font-size: 0.75rem;
  font-weight: 400;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid #d5d8de;
  border-radius: 6px;
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color 0.2s ease;
}

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

.form-group.has-error input,
.form-group.has-error textarea {
  border-color: #c0392b;
}

.error-message {
  display: block;
  color: #c0392b;
  font-size: 0.8rem;
  margin-top: 6px;
  min-height: 1em;
}

.contact-form .btn {
  width: 100%;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.form-success {
  color: #1e7e34;
  margin-top: 16px;
  text-align: center;
}

.form-error {
  color: #c0392b;
  margin-top: 16px;
  padding: 12px 14px;
  border: 1px solid #e7b4ae;
  border-radius: 6px;
  background: #fff5f4;
  font-weight: 500;
  line-height: 1.6;
  text-align: left;
}

/* ---------- Contact Flow / Subpages ---------- */
.contact-steps {
  display: grid;
  max-width: 640px;
  grid-template-columns: repeat(3, 1fr);
  margin: 0 auto 28px;
  padding: 0;
}

.contact-steps li {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: #89909a;
  font-size: .82rem;
}

.contact-steps li:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 17px;
  left: calc(50% + 42px);
  width: calc(100% - 84px);
  height: 1px;
  background: #d5d8de;
}

.contact-steps li span {
  position: relative;
  z-index: 1;
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid #d5d8de;
  border-radius: 50%;
  background: var(--color-white);
  font-family: var(--font-en);
  font-weight: 700;
}

.contact-steps li.active,
.contact-steps li.complete { color: var(--color-navy); }
.contact-steps li.active span { border-color: var(--color-accent); background: var(--color-accent); color: var(--color-white); }
.contact-steps li.complete span { border-color: var(--color-navy); background: var(--color-navy); color: var(--color-white); }
.contact-steps li.complete::after { background: var(--color-navy); }

.subpage-body {
  display: flex;
  min-height: 100vh;
  flex-direction: column;
  background: var(--color-gray);
}

.subpage-header { position: fixed; }
.subpage-home-link { color: var(--color-white); font-size: .9rem; font-weight: 700; }
.subpage-home-link:hover { color: var(--color-accent); }

.subpage-main {
  flex: 1;
  padding: calc(var(--header-height) + 64px) 24px 80px;
}

.subpage-container { max-width: 880px; margin: 0 auto; }
.subpage-title { margin-bottom: 10px; color: var(--color-navy); font-size: clamp(1.75rem, 4vw, 2.35rem); line-height: 1.4; }
.subpage-lead { margin-bottom: 34px; color: #676d76; }
.subpage-footer { margin-top: auto; }

.confirmation-card,
.result-card {
  border-radius: 12px;
  background: var(--color-white);
  box-shadow: 0 8px 28px rgba(11, 30, 51, .08);
}

.confirmation-card { padding: 12px 44px 40px; }
.confirmation-list > div { display: grid; grid-template-columns: 190px 1fr; gap: 24px; padding: 24px 0; border-bottom: 1px solid #e2e4e8; }
.confirmation-list dt { color: var(--color-navy); font-weight: 700; }
.confirmation-list dd { min-width: 0; overflow-wrap: anywhere; }
.preserve-lines { white-space: pre-wrap; }

.confirmation-actions { display: flex; justify-content: center; gap: 14px; padding-top: 32px; }
.confirmation-actions .btn { min-width: 210px; border: 0; cursor: pointer; font-family: inherit; font-size: .95rem; text-align: center; }
.btn-outline { border: 1px solid #cdd1d7 !important; background: var(--color-white); color: var(--color-navy); }
.btn-outline:hover { border-color: var(--color-navy) !important; box-shadow: 0 6px 18px rgba(11, 30, 51, .1); }

.result-card { padding: 60px 40px; text-align: center; }
.result-icon { display: grid; width: 72px; height: 72px; margin: 0 auto 24px; place-items: center; border-radius: 50%; background: #e8f4ed; color: #247246; font-size: 2rem; font-weight: 900; }
.result-card h1,
.result-card h2 { margin-bottom: 16px; color: var(--color-navy); }
.result-card > p { max-width: 620px; margin: 0 auto 30px; }
.result-card .btn { min-width: 220px; text-align: center; }

.error-main { display: grid; place-items: center; }
.error-code { margin-bottom: 4px !important; color: var(--color-accent); font-family: var(--font-en); font-size: clamp(4.5rem, 14vw, 8rem); font-weight: 700; line-height: 1; letter-spacing: .04em; }
.redirect-notice { margin-bottom: 24px !important; padding: 12px 16px; border-radius: 6px; background: var(--color-gray); font-size: .9rem; }
.redirect-notice strong { color: var(--color-accent); font-family: var(--font-en); font-size: 1.2rem; }

/* ---------- Access ---------- */
.access-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 32px;
  align-items: start;
}

.access-map iframe {
  border-radius: 8px;
}

.access-info p {
  margin-bottom: 20px;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-navy);
  color: var(--color-white);
  padding: 32px 24px;
}

.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-copy {
  font-size: 0.8rem;
  opacity: 0.7;
}

/* ---------- Scroll Reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Scroll To Top ---------- */
.scroll-top {
  position: fixed;
  left: 28px;
  bottom: 28px;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--color-navy);
  border: 2px solid rgba(255, 255, 255, 0.15);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(11, 30, 51, 0.35);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.9);
  transition: opacity 0.25s ease, transform 0.25s ease, background 0.2s ease, box-shadow 0.2s ease;
  z-index: 900;
}

.scroll-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.scroll-top:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  box-shadow: 0 10px 28px rgba(217, 140, 43, 0.4);
  transform: translateY(-3px) scale(1.05);
}

@media (max-width: 780px) {
  .scroll-top {
    left: 16px;
    bottom: 16px;
    width: 54px;
    height: 54px;
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .about-grid,
  .access-grid {
    grid-template-columns: 1fr;
  }

  .business-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 780px) {
  .site-nav {
    position: fixed;
    top: var(--header-height);
    right: 0;
    width: 240px;
    height: calc(100vh - var(--header-height));
    background: var(--color-navy);
    flex-direction: column;
    align-items: flex-start;
    padding: 32px 24px;
    gap: 24px;
    transform: translateX(100%);
    transition: transform 0.3s ease;
  }

  .site-nav.is-open {
    transform: translateX(0);
  }

  .nav-toggle {
    display: flex;
  }

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

  .about-stats {
    grid-template-columns: 1fr 1fr;
  }

  /* スマホ：見出し・本文は左揃えのまま、価値観4項目とCTAだけ中央に寄せる */
  .hero-values {
    gap: 8px;
    justify-content: center;
  }

  .hero-values li {
    padding: 8px 12px;
  }

  .hero-content .btn-primary {
    display: block;
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
  }

  .company-row {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .hero-title {
    font-size: 1.9rem;
  }

  .contact-form {
    padding: 32px 20px;
  }

  .contact-steps li { flex-direction: column; gap: 5px; font-size: .72rem; }
  .contact-steps li:not(:last-child)::after { top: 17px; left: calc(50% + 24px); width: calc(100% - 48px); }
  .subpage-main { padding: calc(var(--header-height) + 40px) 16px 56px; }
  .confirmation-card { padding: 4px 22px 28px; }
  .confirmation-list > div { grid-template-columns: 1fr; gap: 5px; padding: 18px 0; }
  .confirmation-actions { flex-direction: column-reverse; }
  .confirmation-actions .btn { width: 100%; min-width: 0; }
  .result-card { padding: 44px 22px; }

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