/* ════════════════════════════════
   I/O HUB Landing Page — style.css
   ════════════════════════════════ */

/* ── RESET & BASE ────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --navy:       #0a1628;
  --navy-light: #1a2a40;
  --blue:       #378add;
  --blue-light: #64b5f6;
  --blue-muted: #85b7eb;
  --blue-pale:  #b5d4f4;
  --text-light: #e8f4ff;
  --text-muted: #8fa8c4;
  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  14px;
  --transition: 0.2s ease;
  --max-width:  1100px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans JP', sans-serif;
  background: #f0f2f5;
  color: #1a1a2e;
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

/* ── SKIP LINK (accessibility) ───────────── */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--blue);
  color: #fff;
  padding: 8px 16px;
  font-size: 14px;
  border-radius: 0 0 6px 0;
  z-index: 9999;
  transition: top 0.2s;
}
.skip-link:focus { top: 0; }

/* ── NAVIGATION ──────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10,22,40,0.97);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(55,138,221,0.2);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav-logo {
  text-decoration: none;
  display: flex;
  align-items: center;
  flex-shrink: 0;
  height: 56px;
}

/* ロゴ画像 — images/logo.png が存在する場合に表示 */
.nav-logo-img {
  display: block;
  height: 32px;       /* ナビバー高さ56px に対して適切な余白 */
  width: auto;
  max-width: 180px;
  object-fit: contain;
}

/* フォールバック（画像なし時）— 初期は非表示、onerror で表示 */
.nav-logo-fallback {
  display: none;           /* onerror で flex に切り替わる */
  align-items: center;
  gap: 8px;
  font-family: 'Space Mono', monospace;
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
}

.nav-logo-icon {
  width: 28px;
  height: 28px;
  background: rgba(55,138,221,0.2);
  border: 1px solid var(--blue);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--blue-light);
}

.nav-links {
  display: flex;
  gap: 0.25rem;
  list-style: none;
}

.nav-links a {
  color: var(--blue-muted);
  text-decoration: none;
  font-size: 12px;
  padding: 6px 9px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}

.nav-links a:hover { color: #fff; background: rgba(55,138,221,0.15); }

.nav-cta {
  background: var(--blue) !important;
  color: #fff !important;
  font-weight: 700 !important;
  font-family: 'Space Mono', monospace;
  font-size: 12px !important;
}

.nav-cta:hover { background: #2a72c3 !important; }

/* hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  flex-shrink: 0;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--blue-muted);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* mobile drawer */
.nav-drawer {
  display: none;
  position: fixed;
  top: 56px;
  left: 0;
  right: 0;
  background: rgba(10,22,40,0.98);
  border-bottom: 1px solid rgba(55,138,221,0.2);
  padding: 1rem 1.5rem;
  z-index: 99;
  flex-direction: column;
  gap: 4px;
}

.nav-drawer.open { display: flex; }

.nav-drawer a {
  color: var(--blue-pale);
  text-decoration: none;
  font-size: 14px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.nav-drawer a:hover { background: rgba(55,138,221,0.15); }

.nav-drawer .nav-cta-mobile {
  margin-top: 8px;
  background: var(--blue);
  color: #fff !important;
  font-weight: 700;
  text-align: center;
  font-family: 'Space Mono', monospace;
  font-size: 13px;
}

/* ── HERO ────────────────────────────────── */
.hero {
  position: relative;
  overflow: hidden;
  min-height: 480px;
  display: flex;
  align-items: center;
}

.hero-bg {
  position: absolute;
  inset: 0;
  /* ▼ ヒーロー背景画像 — images/hero-bg.jpg を差し替えてください */
  background:
    linear-gradient(135deg, rgba(4,22,50,0.97) 0%, rgba(10,22,40,0.90) 55%, rgba(10,22,40,0.78) 100%),
    var(--hero-bg-image, url('../images/hero-bg.jpg')) center/cover no-repeat;
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(55,138,221,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(55,138,221,0.06) 1px, transparent 1px);
  background-size: 40px 40px;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 4rem 2rem;
  width: 100%;
  display: flex;
  gap: 3rem;
  align-items: center;
}

.hero-content { flex: 1; min-width: 0; }

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--blue-light);
  border: 1px solid rgba(100,181,246,0.5);
  padding: 4px 12px;
  border-radius: 2px;
  margin-bottom: 1.2rem;
  text-transform: uppercase;
}

.hero h1 {
  font-family: 'Space Mono', monospace;
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  color: #ffffff;
  line-height: 1.1;
  margin-bottom: 0.5rem;
}

.hero-sub {
  font-family: 'Space Mono', monospace;
  font-size: 12px;
  color: var(--blue-muted);
  letter-spacing: 0.1em;
  margin-bottom: 1.2rem;
}

.hero-desc {
  font-size: 15px;
  color: var(--blue-pale);
  max-width: 500px;
  line-height: 1.85;
  margin-bottom: 2rem;
}

.stat-row { display: flex; gap: 12px; flex-wrap: wrap; }

.stat-chip {
  background: rgba(55,138,221,0.14);
  border: 1px solid rgba(55,138,221,0.35);
  border-radius: var(--radius-sm);
  padding: 0.65rem 1.1rem;
  text-align: center;
  min-width: 80px;
}

.stat-num {
  font-family: 'Space Mono', monospace;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--blue-light);
  display: block;
  line-height: 1.2;
}

.stat-label { font-size: 11px; color: var(--blue-muted); margin-top: 2px; }

/* device wrapper — right side of hero */
.hero-device {
  flex-shrink: 0;
  display: flex;
  align-items: flex-end;  /* ケーブルが下に伸びる画像に合わせて下揃え */
  justify-content: center;
}

/* device photo — actual product image */
.device-photo {
  width: 180px;
  height: auto;
  max-height: 360px;
  object-fit: contain;
  display: block;
  /* 透過PNG の白いハロー対策 */
  filter: drop-shadow(0 8px 24px rgba(55,138,221,0.18));
}





/* ── SECTION COMMON ──────────────────────── */
.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.section-eyebrow {
  font-family: 'Space Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--blue);
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}

.section-heading {
  font-size: clamp(1.1rem, 3vw, 1.4rem);
  font-weight: 700;
  margin-bottom: 2rem;
}

.section-heading.light { color: #fff; }
.section-heading.dark  { color: #1a1a2e; }

/* ── FLOW DIAGRAM ────────────────────────── */
.flow-section { background: var(--navy); padding: 3rem 0; }

.flow-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 8px;
}

.flow-diagram {
  display: flex;
  align-items: stretch;
  gap: 0;
  min-width: 640px;
}

.flow-node {
  flex: 1;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(55,138,221,0.2);
  border-radius: var(--radius-md);
  padding: 1rem 0.75rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  min-width: 110px;
  transition: background var(--transition);
}

.flow-node:hover { background: rgba(255,255,255,0.07); }
.flow-node.n-red   { border-color: rgba(224,75,74,0.45);  background: rgba(224,75,74,0.07); }
.flow-node.n-blue  { border-color: rgba(55,138,221,0.5);  background: rgba(55,138,221,0.1); }
.flow-node.n-teal  { border-color: rgba(93,202,165,0.45); background: rgba(93,202,165,0.07); }
.flow-node.n-amber { border-color: rgba(250,199,117,0.4); background: rgba(250,199,117,0.07); }

.flow-arrow {
  display: flex;
  align-items: center;
  padding: 0 6px;
  flex-shrink: 0;
  color: var(--blue);
}

.fn-icon { font-size: 24px; margin-bottom: 8px; }
.fn-icon.red   { color: #e24b4a; }
.fn-icon.blue  { color: var(--blue-light); }
.fn-icon.teal  { color: #5dcaa5; }
.fn-icon.amber { color: #fac775; }

.fn-title {
  font-family: 'Space Mono', monospace;
  font-size: 10px;
  font-weight: 700;
  color: #e8f4ff;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
  line-height: 1.5;
}

.fn-sub { font-size: 11px; color: var(--blue-muted); line-height: 1.6; }

.fn-items {
  margin-top: 8px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  width: 100%;
}

.fn-item {
  font-size: 10px;
  color: var(--blue-pale);
  background: rgba(55,138,221,0.1);
  border-radius: 3px;
  padding: 3px 5px;
  text-align: left;
}

.fn-badge {
  display: inline-block;
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 3px;
  margin: 2px;
  font-family: 'Space Mono', monospace;
}

.badge-hi { background: rgba(224,75,74,0.25);   color: #f09595; }
.badge-mi { background: rgba(250,199,117,0.2);  color: #fac775; }
.badge-lo { background: rgba(93,202,165,0.2);   color: #5dcaa5; }

.fn-dtmf-badge {
  font-family: 'Space Mono', monospace;
  font-size: 9px;
  color: #85b7eb;
  margin-top: 8px;
  border: 1px solid rgba(55,138,221,0.3);
  padding: 2px 7px;
  border-radius: 3px;
  display: inline-block;
}

.fn-count {
  font-family: 'Space Mono', monospace;
  font-size: 9px;
  margin-top: 8px;
}

.fn-count.red   { color: #f09595; }
.fn-count.amber { color: #fac775; }

.fn-badge-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2px;
  margin-top: 6px;
}

/* ── FEATURES ────────────────────────────── */
.features-section { padding: 3.5rem 0; background: #f0f2f5; }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.feat-card {
  background: #fff;
  border: 1px solid rgba(0,0,0,0.07);
  border-radius: var(--radius-lg);
  padding: 1.4rem 1.25rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.feat-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}

.feat-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  font-size: 22px;
}

.feat-icon.fi-blue  { background: #e6f1fb; color: #185fa5; }
.feat-icon.fi-teal  { background: #e1f5ee; color: #0f6e56; }
.feat-icon.fi-amber { background: #faeeda; color: #854f0b; }
.feat-icon.fi-coral { background: #faece7; color: #993c1d; }

.feat-card h3 {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: #1a1a2e;
}

.feat-card p { font-size: 13px; color: #555; line-height: 1.7; }

/* ── IO TABS ─────────────────────────────── */
.io-section { background: #fff; padding: 3.5rem 0; }

.io-tabs {
  display: flex;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid rgba(0,0,0,0.1);
  margin-bottom: 1.5rem;
}

.io-tab {
  flex: 1;
  padding: 0.75rem;
  text-align: center;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  background: #f5f7fa;
  color: #666;
  border: none;
  transition: all 0.15s;
}

.io-tab.active { background: var(--navy); color: #e8f4ff; }

.io-content { display: none; }
.io-content.active { display: block; }

.port-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
  margin-bottom: 1.2rem;
}

.port-grid-output { grid-template-columns: repeat(3, 1fr); }

.port-item {
  background: #f5f7fa;
  border: 1px solid rgba(0,0,0,0.08);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.4rem;
  text-align: center;
  transition: border-color var(--transition);
}

.port-item:hover { border-color: var(--blue); }

.port-num {
  font-family: 'Space Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  color: #185fa5;
  display: block;
}

.port-num.red-p { color: #a32d2d; }
.port-dtmf { font-size: 11px; color: #888; }

.io-desc {
  font-size: 14px;
  color: #444;
  line-height: 1.8;
  padding: 1rem 1.2rem;
  background: #f5f7fa;
  border-radius: var(--radius-md);
  border-left: 4px solid var(--blue);
}

/* ── OPERATION FLOW ──────────────────────── */
.op-section { background: var(--navy); padding: 3.5rem 0; }

.op-steps { display: flex; flex-direction: column; gap: 0; }

.op-step {
  display: flex;
  gap: 1.2rem;
  align-items: flex-start;
  padding: 1.2rem 0;
  border-bottom: 1px solid rgba(55,138,221,0.15);
}

.op-step:last-child { border-bottom: none; }

.step-num {
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  color: var(--blue);
  background: rgba(55,138,221,0.15);
  border: 1px solid rgba(55,138,221,0.3);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-weight: 700;
}

.step-body h3 {
  font-size: 14px;
  font-weight: 700;
  color: #e8f4ff;
  margin-bottom: 0.25rem;
  font-family: 'Space Mono', monospace;
}

.step-body p { font-size: 13px; color: var(--blue-muted); line-height: 1.7; }

/* ── SPEC TABLE ──────────────────────────── */
.spec-section { padding: 3.5rem 0; background: #f0f2f5; }

.spec-table-wrap { overflow-x: auto; }

.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(0,0,0,0.07);
}

.spec-table tbody tr { border-bottom: 1px solid rgba(0,0,0,0.06); }
.spec-table tbody tr:last-child { border-bottom: none; }
.spec-table tbody tr:hover td { background: #f8faff; }

.spec-table td { padding: 0.85rem 1.2rem; vertical-align: middle; }

.spec-table td:first-child {
  color: #555;
  font-size: 13px;
  width: 42%;
  border-right: 1px solid rgba(0,0,0,0.05);
}

.spec-table td:last-child {
  font-weight: 500;
  font-family: 'Space Mono', monospace;
  font-size: 13px;
  color: #1a1a2e;
}

.spec-table thead tr { background: var(--navy); }

.spec-table thead th {
  padding: 0.75rem 1.2rem;
  font-size: 12px;
  font-weight: 700;
  color: var(--blue-pale);
  font-family: 'Space Mono', monospace;
  letter-spacing: 0.05em;
  text-align: left;
}

/* ── USE CASES ───────────────────────────── */
.use-section { padding: 3.5rem 0; background: #fff; }

.use-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.use-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(0,0,0,0.08);
  background: #fff;
  transition: transform var(--transition), box-shadow var(--transition);
}

.use-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.1);
}

.use-img-wrap {
  width: 100%;
  height: 130px;
  overflow: hidden;
  position: relative;
}

.use-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.82);
  transition: transform 0.4s ease, filter 0.4s ease;
}

.use-card:hover .use-img-wrap img {
  transform: scale(1.06);
  filter: brightness(0.92);
}

.use-img-overlay {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 55%;
  background: linear-gradient(transparent, rgba(5,15,35,0.8));
  pointer-events: none;
}

.use-img-icon {
  position: absolute;
  top: 10px; right: 10px;
  width: 32px; height: 32px;
  background: rgba(55,138,221,0.88);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: #fff;
}

.use-info { padding: 0.85rem 1rem; }
.use-info p { font-size: 13px; font-weight: 700; color: #1a1a2e; margin-bottom: 3px; }
.use-info span { font-size: 12px; color: #666; }

/* ── CTA ─────────────────────────────────── */
.cta-section { background: var(--navy); padding: 4rem 0; text-align: center; }

.cta-section h2 {
  font-family: 'Space Mono', monospace;
  font-size: clamp(1rem, 3vw, 1.3rem);
  color: #fff;
  margin-bottom: 0.6rem;
}

.cta-section p { font-size: 14px; color: var(--blue-muted); margin-bottom: 1.8rem; }

.cta-btn {
  display: inline-block;
  background: var(--blue);
  color: #fff;
  font-family: 'Space Mono', monospace;
  font-size: 14px;
  font-weight: 700;
  padding: 0.85rem 2.5rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  letter-spacing: 0.05em;
  transition: background var(--transition), transform var(--transition);
}

.cta-btn:hover { background: #2a72c3; transform: translateY(-2px); }

/* ── FOOTER ──────────────────────────────── */
.footer { background: #060e1c; padding: 2rem; text-align: center; }
.footer p { font-size: 12px; color: #3a5a7a; }
.footer a { color: #4a7aaa; text-decoration: none; }

/* ── CONNECTION DIAGRAM ──────────────────── */
.conn-section {
  padding: 3.5rem 0;
  background: #f8faff;
}

.conn-diagram {
  background: #fff;
  border: 1px solid rgba(55,138,221,0.15);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.5rem 1rem;
  margin-bottom: 2rem;
}

.conn-diagram-alt {
  background: #f0f6ff;
  border-color: rgba(55,138,221,0.2);
  margin-bottom: 0;
}

.conn-label-top {
  font-family: 'Space Mono', monospace;
  font-size: 13px;
  font-weight: 700;
  color: var(--blue);
  letter-spacing: 0.08em;
  margin-bottom: 1.8rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid rgba(55,138,221,0.15);
}

.conn-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: nowrap;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 0.75rem;
}

/* 各デバイスボックス */
.conn-device {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  min-width: 120px;
  flex-shrink: 0;
}

.conn-device-img {
  object-fit: contain;
  display: block;
  border-radius: 8px;
}

/* インターホン画像 */
.conn-device-img:not(.conn-iohub-img):not(.conn-lucatel-img) {
  width: 110px;
  height: 136px;
  background: #f0f2f5;
  padding: 6px;
}

/* I/O HUB 画像 */
.conn-iohub-img {
  width: 86px;
  height: auto;
  max-height: 160px;
}

/* Lucatel 画像 */
.conn-lucatel-img {
  width: 80px;
  height: 160px;
  background: #f8f8f6;
  padding: 6px;
  border-radius: 8px;
}

.conn-device-name {
  font-size: 14px;
  font-weight: 700;
  color: #1a1a2e;
  text-align: center;
  line-height: 1.5;
}

.conn-device-name span {
  display: block;
  font-size: 12px;
  font-weight: 400;
  color: #888;
  margin-top: 2px;
}

/* クラウド/コールセンターアイコン */
.conn-cloud { min-width: 110px; }

.conn-cloud-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, #0a1628, #1a3a5f);
  border: 1.5px solid rgba(55,138,221,0.5);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  color: var(--blue-light);
}

/* 矢印エリア */
.conn-arrow-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
  min-width: 100px;
}

.conn-line-label {
  font-size: 11px;
  color: #666;
  text-align: center;
  line-height: 1.4;
  font-family: 'Space Mono', monospace;
}

.conn-arrow svg {
  width: 110px;
  height: 28px;
  display: block;
}

/* 接点説明バー */
.conn-spec-bar {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(0,0,0,0.06);
}

.conn-spec-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: #555;
  font-family: 'Space Mono', monospace;
}

.conn-spec-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.conn-spec-dot.in  { background: #e24b4a; }
.conn-spec-dot.out { background: #378add; }
.conn-spec-dot.ai  { background: #5dcaa5; }

/* ── INSTALLATION SCENE ──────────────────── */
.install-section {
  padding: 3.5rem 0;
  background: #f0f2f5;
}

/* キャッチコピー */
.install-catch {
  text-align: center;
  margin-bottom: 2rem;
}

.install-catch-main {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  font-weight: 700;
  color: #1a1a2e;
  margin-bottom: 1rem;
}

.install-catch-tags {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.install-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--navy);
  color: var(--blue-light);
  font-size: 13px;
  font-weight: 700;
  padding: 6px 16px;
  border-radius: 999px;
  border: 1px solid rgba(55,138,221,0.35);
}

.install-tag i { font-size: 15px; }

/* 3カラムグリッド */
.install-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

/* カード */
.install-card {
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(0,0,0,0.07);
  transition: transform var(--transition), box-shadow var(--transition);
}

.install-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.1);
}

/* 画像エリア */
.install-img-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 3 / 2;
  overflow: hidden;
}

.install-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}

.install-card:hover .install-img-wrap img {
  transform: scale(1.05);
}

.install-img-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(10,22,40,0.55) 0%, transparent 55%);
  pointer-events: none;
}

/* 画像上のラベル */
.install-img-label {
  position: absolute;
  bottom: 10px;
  left: 12px;
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  color: #fff;
  background: rgba(55,138,221,0.85);
  padding: 3px 10px;
  border-radius: 4px;
  letter-spacing: 0.05em;
}

/* テキストエリア */
.install-card-body {
  padding: 1.1rem 1.2rem 1.3rem;
}

.install-card-body h3 {
  font-size: 14px;
  font-weight: 700;
  color: #1a1a2e;
  margin-bottom: 0.5rem;
}

.install-card-body p {
  font-size: 13px;
  color: #555;
  line-height: 1.75;
}

/* ── DIMENSIONS ──────────────────────────── */
.dims-section {
  padding: 3.5rem 0;
  background: #fff;
}

.dims-img-wrap {
  background: #f5f7fa;
  border: 1px solid rgba(0,0,0,0.07);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.dims-img {
  display: block;
  width: 100%;
  max-width: 900px;
  height: auto;
  margin: 0 auto;
  object-fit: contain;
}

/* ════════════════════════════════
   RESPONSIVE BREAKPOINTS
════════════════════════════════ */

/* Tablet: ≤ 900px */
@media (max-width: 900px) {
  .hero-inner { flex-direction: column; align-items: flex-start; gap: 2rem; }
  .hero-device { align-self: center; }
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .use-grid { grid-template-columns: repeat(2, 1fr); }
}

/* Mobile: ≤ 600px */
@media (max-width: 600px) {
  .hero { min-height: auto; }
  .hero-inner { padding: 2.5rem 1.25rem; gap: 1.5rem; }
  .hero-device { align-self: center; }
  .device-photo { width: 140px; max-height: 280px; }
  .stat-row { gap: 8px; }
  .stat-chip { padding: 0.5rem 0.8rem; min-width: 70px; }
  .stat-num { font-size: 1.2rem; }
  .section-inner { padding: 0 1.25rem; }
  .features-section,
  .io-section,
  .op-section,
  .spec-section,
  .use-section,
  .flow-section { padding: 2.5rem 0; }
  .install-grid { grid-template-columns: 1fr; }
  .conn-arrow svg { width: 50px; }
  .conn-arrow-wrap { min-width: 55px; }
  .conn-line-label { font-size: 8px; }
  .conn-device { min-width: 70px; }
  .conn-device-name { font-size: 10px; }
  .feature-grid { grid-template-columns: 1fr; }
  .use-grid { grid-template-columns: 1fr; }
  .port-grid { grid-template-columns: repeat(5, 1fr); gap: 6px; }
  .port-num { font-size: 10px; }
  .port-dtmf { font-size: 9px; }
  .spec-table td { padding: 0.7rem 0.9rem; font-size: 12px; }
  .spec-table td:first-child { width: 45%; }
  .cta-section { padding: 3rem 1.25rem; }
  .nav-inner { padding: 0 1.25rem; }
}

/* Small mobile: ≤ 380px */
@media (max-width: 380px) {
  .hero h1 { font-size: 1.7rem; }
  .stat-row { justify-content: flex-start; }
  .stat-chip { min-width: 60px; }
  .port-grid { gap: 4px; }
  .port-num { font-size: 9px; }
}

/* Print */
@media print {
  .nav, .nav-drawer, .cta-section { display: none; }
  body { background: #fff; color: #000; }
  .hero { min-height: auto; }
  .hero-bg { display: none; }
  .hero h1, .hero-desc, .hero-sub { color: #000 !important; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}