/* =========================================================
   東京電機大学 阿部研究室 - 産学連携・PoC LP Custom Styles
   ========================================================= */

:root {
  --color-primary: #0b3d6e;       /* アカデミック・信頼感のあるディープブルー */
  --color-primary-dark: #06264a;
  --color-primary-light: #1f6fb2;
  --color-accent: #00b8d9;        /* セキュリティ/テック感のあるシアン */
  --color-accent-dark: #0092ad;
  --color-danger: #d64545;        /* 比較表の「弱点」表示用 */
  --color-safe: #12a888;          /* 比較表の「強み」表示用 */
  --color-warn-bg: #fdecec;
  --color-safe-bg: #e8faf4;
  --color-bg: #f4f7fb;
  --color-ink: #14202e;
  --color-ink-soft: #4c5c6e;
  --color-border: #dbe4ee;
  --font-jp: 'Noto Sans JP', 'Zen Kaku Gothic New', sans-serif;
  --font-heading: 'Zen Kaku Gothic New', 'Noto Sans JP', sans-serif;
  --font-mono: 'Roboto Mono', monospace;
  --max-width: 1180px;
  --radius: 14px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-jp);
  color: var(--color-ink);
  background: var(--color-bg);
  line-height: 1.75;
  font-size: 16px;
}

h1, h2, h3, h4 { font-family: var(--font-heading); margin: 0; line-height: 1.4; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul, ol { margin: 0; padding: 0; }

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

.hl { color: var(--color-accent); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-weight: 700;
  border-radius: 8px;
  padding: 14px 28px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease, background .2s ease, color .2s ease;
  white-space: nowrap;
  font-size: 15px;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-dark));
  color: #fff;
  box-shadow: 0 8px 20px rgba(0, 184, 217, .3);
}
.btn-primary:hover { box-shadow: 0 12px 26px rgba(0, 184, 217, .42); }
.btn-outline {
  background: rgba(255,255,255,.06);
  border-color: rgba(255,255,255,.8);
  color: #fff;
}
.btn-outline:hover { background: rgba(255,255,255,.16); }
.btn-lg { padding: 16px 30px; font-size: 15.5px; }
.btn-sm { padding: 9px 18px; font-size: 13px; border-radius: 6px; }
.btn-block { width: 100%; }

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(255,255,255,.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 10px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-logo { height: 34px; width: auto; flex-shrink: 0; }
.brand-text { display: flex; flex-direction: column; line-height: 1.3; }
.brand-univ { font-size: 10.5px; color: var(--color-ink-soft); font-weight: 500; }
.brand-lab { font-size: 14.5px; font-weight: 700; color: var(--color-primary); }

.main-nav { display: flex; gap: 26px; flex-wrap: wrap; }
.main-nav a {
  font-size: 13.5px; font-weight: 500; color: var(--color-ink-soft);
  padding: 4px 0;
}
.main-nav a:hover { color: var(--color-primary); }

.header-cta { display: flex; align-items: center; gap: 12px; }
.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: #fff;
  font-size: 16px;
  align-items: center; justify-content: center;
}

/* ---------- Hero ---------- */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 70px;
  overflow: hidden;
  color: #fff;
}
.hero-bg { position: absolute; inset: 0; z-index: 0; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; }
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(120deg, rgba(6,26,50,.95) 0%, rgba(6,50,86,.9) 45%, rgba(0,60,80,.82) 100%);
}
.hero-grid-pattern {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(0,184,217,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,184,217,.06) 1px, transparent 1px);
  background-size: 40px 40px;
}
.hero-content {
  position: relative; z-index: 1;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 24px;
  text-align: left;
}
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12.5px; font-weight: 700; letter-spacing: .04em;
  color: var(--color-accent);
  background: rgba(0,184,217,.14);
  border: 1px solid rgba(0,184,217,.4);
  border-radius: 999px;
  padding: 6px 16px;
  margin-bottom: 22px;
}
.hero-title {
  font-size: clamp(26px, 4vw, 42px);
  font-weight: 900;
  letter-spacing: .01em;
  margin-bottom: 16px;
}
.hero-subtitle-lab {
  font-size: 14.5px;
  color: rgba(255,255,255,.82);
  margin-bottom: 18px;
  font-weight: 500;
}
.hero-subcopy {
  font-size: 15.5px;
  color: rgba(255,255,255,.92);
  margin-bottom: 28px;
  max-width: 640px;
}

.hero-video-frame { margin-bottom: 28px; max-width: 560px; }
.video-placeholder {
  aspect-ratio: 16/9;
  border-radius: 12px;
  background: rgba(255,255,255,.06);
  border: 1.5px dashed rgba(255,255,255,.35);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 10px;
  color: rgba(255,255,255,.75);
}
.video-placeholder i { font-size: 44px; color: var(--color-accent); }
.video-placeholder p { font-size: 13px; margin: 0; text-align: center; }
.video-placeholder p span { display: block; font-size: 11px; color: rgba(255,255,255,.5); }

.hero-cta-group { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 26px; }
.hero-trust-list { display: flex; flex-wrap: wrap; gap: 20px; list-style: none; }
.hero-trust-list li { font-size: 13px; color: rgba(255,255,255,.85); display: flex; align-items: center; gap: 6px; }
.hero-trust-list i { color: var(--color-accent); }

.scroll-cue {
  position: absolute; bottom: 24px; left: 50%; transform: translateX(-50%);
  color: rgba(255,255,255,.7);
  font-size: 20px;
  animation: bounce 2s infinite;
  z-index: 1;
}
@keyframes bounce {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, 8px); }
}

/* ---------- Section common ---------- */
section { padding: 84px 0; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 48px; }
.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px; font-weight: 700; letter-spacing: .1em;
  color: var(--color-accent-dark);
  margin-bottom: 12px;
}
.section-tag--light { color: var(--color-accent); }
.section-title {
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  color: var(--color-ink);
  margin-bottom: 14px;
}
.section-title--light { color: #fff; }
.section-desc { color: var(--color-ink-soft); font-size: 14.5px; }

/* ---------- About / Background ---------- */
.about-section { background: #fff; }
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: start;
}
.lead-paragraph { color: var(--color-ink-soft); margin-bottom: 18px; font-size: 15px; }
.lead-paragraph strong { color: var(--color-primary); }
.lead-signature {
  margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--color-border);
}
.signature-name { font-weight: 700; margin-bottom: 4px; font-size: 14.5px; }
.signature-role { color: var(--color-ink-soft); font-size: 13.5px; }

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  align-content: start;
}
.stat-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
}
.stat-card--accent { background: linear-gradient(135deg, rgba(0,184,217,.08), rgba(11,61,110,.06)); border-color: rgba(0,184,217,.3); }
.stat-value {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}
.stat-card--accent .stat-value { color: var(--color-accent-dark); }
.stat-value .unit { font-size: 16px; font-weight: 600; }
.stat-label { font-size: 12.5px; color: var(--color-ink-soft); line-height: 1.5; }

/* ---------- Comparison Table ---------- */
.comparison-section { background: var(--color-bg); }
.table-wrap { overflow-x: auto; border-radius: var(--radius); box-shadow: 0 12px 30px rgba(11,61,110,.08); }
.compare-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  min-width: 640px;
}
.compare-table th, .compare-table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
}
.compare-table thead th {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  background: var(--color-primary);
}
.th-item { background: var(--color-primary-dark) !important; width: 26%; }
.th-cloud { background: #64748b !important; }
.th-local { background: var(--color-accent-dark) !important; }
.th-cloud i, .th-local i { margin-right: 8px; }
.td-item { font-weight: 700; color: var(--color-ink); background: #f8fafc; }
.td-cloud { color: var(--color-danger); background: var(--color-warn-bg); }
.td-local { color: var(--color-safe); background: var(--color-safe-bg); font-weight: 600; }
.td-cloud i, .td-local i { margin-right: 8px; }
.compare-table tbody tr:last-child td { border-bottom: none; }
.table-note { font-size: 12px; color: #94a3b8; text-align: center; margin-top: 16px; }

/* ---------- Strengths ---------- */
.strengths-section { background: #fff; }
.strengths-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
  margin-bottom: 48px;
}
.strength-card {
  background: var(--color-bg);
  border-radius: var(--radius);
  padding: 32px 26px;
  border: 1px solid var(--color-border);
  transition: transform .2s ease, box-shadow .2s ease;
}
.strength-card:hover { transform: translateY(-4px); box-shadow: 0 16px 30px rgba(11,61,110,.1); }
.strength-icon {
  width: 54px; height: 54px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px;
  margin-bottom: 20px;
}
.strength-title { font-size: 16px; font-weight: 700; margin-bottom: 12px; line-height: 1.5; }
.strength-desc { color: var(--color-ink-soft); font-size: 14px; }

.performance-band {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}
.perf-item {
  background: var(--color-primary-dark);
  color: #fff;
  padding: 28px 16px;
  text-align: center;
}
.perf-value {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 8px;
}
.perf-value .unit { font-size: 13px; color: rgba(255,255,255,.8); font-weight: 500; }
.perf-label { font-size: 12px; color: rgba(255,255,255,.75); line-height: 1.5; }

/* ---------- Process ---------- */
.process-section { background: var(--color-bg); }
.process-steps {
  list-style: none;
  display: flex;
  flex-direction: column;
  max-width: 780px;
  margin: 0 auto;
}
.process-step {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px dashed var(--color-border);
}
.process-step:last-child { border-bottom: none; }
.step-number {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13.5px;
  color: #fff;
  background: var(--color-primary);
  border-radius: 8px;
  height: fit-content;
  padding: 9px 0;
  text-align: center;
}
.step-title { font-size: 16px; font-weight: 700; margin-bottom: 8px; display: flex; align-items: center; gap: 10px; }
.step-title i { color: var(--color-accent-dark); }
.step-desc { color: var(--color-ink-soft); font-size: 14px; }

/* ---------- Themes ---------- */
.themes-section { background: #fff; }
.themes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-bottom: 40px;
}
.theme-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: transform .2s ease, box-shadow .2s ease;
  position: relative;
}
.theme-card:hover { transform: translateY(-4px); box-shadow: 0 16px 30px rgba(11,61,110,.1); }
.theme-icon {
  width: 46px; height: 46px;
  border-radius: 10px;
  background: rgba(0,184,217,.12);
  color: var(--color-accent-dark);
  display: flex; align-items: center; justify-content: center;
  font-size: 19px;
  margin-bottom: 16px;
}
.theme-title { font-size: 15.5px; font-weight: 700; margin-bottom: 10px; line-height: 1.5; }
.theme-summary { font-size: 13px; font-weight: 600; color: var(--color-primary); margin-bottom: 10px; }
.theme-desc { font-size: 13.5px; color: var(--color-ink-soft); }
.theme-card--recruiting {
  background: linear-gradient(150deg, rgba(11,61,110,.06), rgba(0,184,217,.1));
  border-color: rgba(0,184,217,.4);
}
.theme-recruit-badge {
  position: absolute; top: -12px; left: 20px;
  background: var(--color-accent-dark);
  color: #fff;
  font-size: 11px; font-weight: 700;
  padding: 5px 12px;
  border-radius: 999px;
}
.theme-link { color: var(--color-primary); font-weight: 700; font-size: 13.5px; margin-top: 12px; display: inline-flex; align-items: center; gap: 6px; }

.future-strip {
  background: var(--color-primary-dark);
  border-radius: var(--radius);
  padding: 26px 32px;
  display: flex; flex-wrap: wrap; align-items: center; gap: 20px;
  justify-content: space-between;
}
.future-strip-title { color: #fff; font-weight: 700; font-size: 14px; margin: 0; display: flex; align-items: center; gap: 8px; }
.future-strip-title i { color: var(--color-accent); }
.future-tags { display: flex; flex-wrap: wrap; gap: 12px; list-style: none; }
.future-tags li {
  font-size: 12.5px; color: #fff;
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 999px;
  padding: 7px 16px;
  display: flex; align-items: center; gap: 6px;
}
.future-tags i { color: var(--color-accent); }

/* ---------- Cases ---------- */
.cases-section { background: var(--color-bg); }
.cases-grid { display: grid; gap: 22px; margin-bottom: 22px; }
.cases-grid--2col { grid-template-columns: repeat(2, 1fr); }
.case-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 30px 28px;
  background: #fff;
}
.case-badge {
  display: inline-block;
  font-size: 12px; font-weight: 700;
  color: var(--color-primary);
  background: rgba(11,61,110,.08);
  border-radius: 999px;
  padding: 6px 16px;
  margin-bottom: 16px;
}
.case-title { font-size: 15.5px; font-weight: 700; margin-bottom: 12px; line-height: 1.5; }
.case-desc { font-size: 13.5px; color: var(--color-ink-soft); margin-bottom: 20px; }
.case-metric { display: flex; align-items: baseline; gap: 12px; border-top: 1px solid var(--color-border); padding-top: 16px; }
.metric-value { font-family: var(--font-mono); font-size: 24px; font-weight: 700; color: var(--color-accent-dark); }
.metric-label { font-size: 12.5px; color: var(--color-ink-soft); }
.cases-note { font-size: 12px; color: #94a3b8; text-align: center; }

/* ---------- FAQ ---------- */
.faq-section { background: #fff; }
.faq-inner { max-width: 800px; }
.faq-list { display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  overflow: hidden;
}
.faq-question {
  width: 100%;
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px;
  padding: 18px 22px;
  background: none;
  border: none;
  text-align: left;
  font-size: 14.5px; font-weight: 700;
  color: var(--color-ink);
  cursor: pointer;
  font-family: inherit;
}
.faq-icon { transition: transform .25s ease; color: var(--color-primary); flex-shrink: 0; }
.faq-item.open .faq-icon { transform: rotate(180deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease;
  padding: 0 22px;
}
.faq-answer p { color: var(--color-ink-soft); font-size: 14px; padding-bottom: 18px; margin: 0; }
.faq-item.open .faq-answer { max-height: 320px; }

/* ---------- Contact ---------- */
.contact-section {
  background: linear-gradient(150deg, var(--color-primary-dark), var(--color-primary));
  color: #fff;
}
.recruit-banner {
  display: flex;
  align-items: center;
  gap: 20px;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(0,184,217,.4);
  border-radius: var(--radius);
  padding: 22px 28px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.recruit-banner-icon {
  width: 48px; height: 48px;
  border-radius: 10px;
  background: var(--color-accent);
  color: var(--color-primary-dark);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.recruit-banner-text { flex: 1; min-width: 220px; }
.recruit-banner-title { font-weight: 700; font-size: 14.5px; margin: 0 0 4px; color: var(--color-accent); }
.recruit-banner-desc { font-size: 13.5px; color: rgba(255,255,255,.85); margin: 0; }

.contact-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 56px;
}
.contact-lead { color: rgba(255,255,255,.85); font-size: 14.5px; margin-bottom: 32px; }
.contact-info-list { display: flex; flex-direction: column; gap: 20px; margin-bottom: 32px; }
.contact-info-item dt { font-size: 12.5px; font-weight: 700; color: var(--color-accent); margin-bottom: 6px; display: flex; align-items: center; gap: 8px; }
.contact-info-item dd { margin: 0; font-size: 14px; color: rgba(255,255,255,.9); }
.contact-info-item a { color: #fff; text-decoration: underline; text-decoration-color: rgba(255,255,255,.4); }
.contact-logo-wrap { padding-top: 20px; border-top: 1px solid rgba(255,255,255,.15); }
.contact-logo { height: 40px; width: auto; filter: brightness(0) invert(1); opacity: .9; }

.contact-form-wrap { background: #fff; border-radius: var(--radius); padding: 34px; color: var(--color-ink); }
.form-title { font-size: 17px; font-weight: 800; margin-bottom: 22px; color: var(--color-primary); }
.form-row { margin-bottom: 16px; }
.form-row--split { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-row label { display: block; font-size: 13px; font-weight: 700; margin-bottom: 7px; color: var(--color-ink); }
.req { color: #d64545; font-size: 11px; font-weight: 700; margin-left: 4px; }
.form-row input, .form-row select, .form-row textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  background: #f8fafc;
  transition: border-color .2s ease, background .2s ease;
}
.form-row input:focus, .form-row select:focus, .form-row textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  background: #fff;
}
.form-note { font-size: 11.5px; color: #94a3b8; margin-top: 12px; text-align: center; }
.form-success, .form-error {
  display: flex; align-items: center; gap: 10px;
  margin-top: 16px; padding: 14px 16px;
  border-radius: 10px; font-size: 13.5px;
}
.form-success { background: var(--color-safe-bg); color: #0d7d64; }
.form-error { background: var(--color-warn-bg); color: #b91c1c; }
.form-success i, .form-error i { font-size: 18px; }

/* ---------- Footer ---------- */
.site-footer { background: #05192f; padding: 28px 0; }
.footer-inner { display: flex; align-items: center; justify-content: center; gap: 20px; flex-wrap: wrap; }
.footer-logo { height: 28px; width: auto; filter: brightness(0) invert(1); opacity: .8; }
.footer-inner p { color: rgba(255,255,255,.55); font-size: 12.5px; margin: 0; }

/* ---------- Mobile fixed CTA ---------- */
.mobile-fixed-cta {
  display: none;
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 90;
  padding: 12px 16px;
  background: rgba(255,255,255,.96);
  border-top: 1px solid var(--color-border);
  backdrop-filter: blur(6px);
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 960px) {
  .main-nav { display: none; }
  .nav-toggle { display: flex; }
  .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .strengths-grid, .themes-grid { grid-template-columns: repeat(2, 1fr); }
  .cases-grid--2col { grid-template-columns: 1fr; }
  .performance-band { grid-template-columns: repeat(2, 1fr); }
  .hero-section { padding-top: 100px; }
}

@media (max-width: 640px) {
  section { padding: 60px 0; }
  .strengths-grid, .themes-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: 1fr 1fr; }
  .form-row--split { grid-template-columns: 1fr; }
  .process-step { grid-template-columns: 64px 1fr; gap: 16px; }
  .hero-cta-group { flex-direction: column; }
  .hero-cta-group .btn { width: 100%; }
  .mobile-fixed-cta { display: block; }
  body { padding-bottom: 76px; }
  .contact-form-wrap { padding: 22px; }
  .compare-table { min-width: 560px; }
  .recruit-banner { flex-direction: column; align-items: flex-start; }
}

/* Mobile nav dropdown */
.main-nav.open {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 100%; left: 0; right: 0;
  background: #fff;
  padding: 16px 24px;
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 12px 24px rgba(0,0,0,.08);
  gap: 14px;
}