/* ══════════════════════════════════════════════════════════
   Strongwall base.css — shared across all pages
   Generated from index.html / about.html / feature.html /
   intro.html / materials.html / projects.html / spec01-05.html
══════════════════════════════════════════════════════════ */

/* ── Tokens (Strongwall brand palette) ────────────────── */
:root {
  --black:       #000000;
  --bg:          #F7F7F7;
  --surface:     #FFFFFF;
  --text:        #2A2A2A;
  --fg:          #2A2A2A;
  --muted:       rgba(42,42,42,.68);
  --border:      rgba(42,42,42,.14);
  --border-strong: rgba(42,42,42,.28);
  --dark:        #2A2A2A;
  --dark-mid:    #2A2A2A;
  --accent:      #0CB59B;
  --accent-dk:   #089B84;
  --accent-lt:   rgba(12,181,155,.16);
  --accent-pale: rgba(12,181,155,.08);
  --brand-deep:   #0CB59B;
  --contact-bg:   #F7F7F7;
  --brand-mid:    #0CB59B;
  --orange:      #FF6600;
  --blue-cat:    var(--accent);

  --font-display: 'Noto Serif TC', 'Georgia', serif;
  --font-body:    'Noto Sans TC', -apple-system, system-ui, sans-serif;
  --font-en:      'Overpass', 'Inter', system-ui, sans-serif;

  --r-sm:  3px;
  --r-md:  4px;
  --r-lg:  6px;

  --shadow-card: 0 1px 8px rgba(0,0,0,0.07);
  --shadow-lift: 0 4px 24px rgba(0,0,0,0.12);

  --ease: cubic-bezier(0.2,0,0,1);
  --dur: 240ms;
}

/* ── Reset ────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-body);
  font-size: 16px;
  background: var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img  { display: block; max-width: 100%; }
a    { color: inherit; text-decoration: none; }
ul   { list-style: none; }

.retina-plus-mark,
.sup-plus-mark {
  display: inline;
  position: relative;
  top: -0.52em;
  margin-left: 0.02em;
  font-size: 0.62em;
  line-height: 0;
  font-weight: inherit;
  vertical-align: baseline;
}

/* ── Layout ─────────────────────────────────────────────── */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 60px);
}
.section-py {
  padding-top:    clamp(72px, 10vw, 120px);
  padding-bottom: clamp(72px, 10vw, 120px);
}

/* ── Section label system ───────────────────────────────── */
.sec-label {
  display: flex;
  align-items: center;
  gap: 16px;
  font-family: var(--font-en);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}
.sec-label::after {
  content: '';
  flex: 1;
  max-width: 48px;
  height: 1px;
  background: var(--accent);
}
.sec-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 46px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--dark);
  letter-spacing: -0.01em;
}
.sec-desc {
  font-size: 16px;
  line-height: 1.9;
  color: var(--muted);
  max-width: 720px;
  margin-top: 18px;
  margin-bottom: 48px;
}
.section-head,
.sec-header {
  margin-bottom: 0;
}
.faq-header .sec-desc,
.history-sidebar .sec-desc,
.resource-cta .sec-desc,
.resource-copy .sec-desc,
.technical-resource .sec-desc {
  margin-bottom: 0;
}
.sec-rule {
  width: 40px;
  height: 2px;
  background: var(--accent);
  margin: 20px 0 0;
}

/* ══════════════════════════════════════════════════════════
   NAV
══════════════════════════════════════════════════════════ */
#nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(255,255,255,.94);
  border-bottom: 1px solid rgba(42,42,42,.10);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
#nav.scrolled {
  background: rgba(255,255,255,.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(42,42,42,.10);
}
#nav > .container {
  max-width: none;
  padding: 0;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(100%, 1680px);
  height: 70px;
  margin: 0 auto;
  padding: 0 clamp(24px, 4vw, 72px);
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}
.nav-logo-mark {
  width: 42px; height: 42px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: transform var(--dur) var(--ease);
}
#nav.scrolled .nav-logo-mark {
  transform: translateY(0);
}
.nav-logo-mark img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}
.nav-brand-name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  color: var(--dark);
  line-height: 1.3;
  transition: color var(--dur) var(--ease);
  min-width: 0;
}
#nav.scrolled .nav-brand-name { color: var(--dark); }
.nav-brand-name small {
  display: block;
  font-family: var(--font-en);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.1em;
  opacity: 0.55;
  margin-top: 1px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0;
}
.nav-links a {
  padding: 6px 14px;
  font-size: 16px;
  color: rgba(42,42,42,.72);
  position: relative;
  transition: color var(--dur) var(--ease);
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 2px; left: 14px; right: 14px;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}
.nav-links a:hover { color: var(--accent); }
.nav-links a:hover::after { transform: scaleX(1); }
.nav-links a.is-active { color: var(--accent); }
.nav-links a.is-active::after { transform: scaleX(1); }
#nav.scrolled .nav-links a { color: var(--muted); }
#nav.scrolled .nav-links a:hover { color: var(--accent); }
.nav-links .retina-plus-mark,
.nav-mobile .retina-plus-mark {
  top: -0.42em;
  font-size: 0.78em;
}

.nav-cta {
  margin-left: 12px;
  padding: 9px 20px !important;
  background: var(--accent);
  color: var(--surface) !important;
  font-weight: 600 !important;
  font-size: 16px;
}
.nav-cta::after { display: none !important; }
.nav-cta:hover { background: var(--accent-dk) !important; opacity: 1; }

.nav-links .nav-phone {
  margin-left: 12px;
  padding: 9px 18px;
  background: var(--accent);
  color: var(--surface);
  font-weight: 600;
  font-size: 16px;
  border-radius: var(--r-md);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.nav-links .nav-phone:hover,
#nav.scrolled .nav-links .nav-phone:hover {
  background: var(--accent-dk);
  color: var(--surface);
  transform: translateY(-1px);
}
#nav.scrolled .nav-links .nav-phone { color: var(--surface); }
.nav-links .nav-phone::after { display: none !important; }

.nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
  position: relative;
}
.nav-burger span {
  display: block;
  width: 22px; height: 1.5px;
  background: var(--dark);
  transform-origin: center;
  transition:
    background var(--dur) var(--ease),
    opacity var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}
#nav.scrolled .nav-burger span { background: var(--dark); }
.nav-burger.is-open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-burger.is-open span:nth-child(2) { opacity: 0; }
.nav-burger.is-open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

.nav-mobile {
  display: none;
  flex-direction: column;
  background: var(--surface);
  border-top: 1px solid var(--border);
}
.nav-mobile.open { display: flex; }
body.mobile-menu-open::before {
  content: '';
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  z-index: 90;
  pointer-events: auto;
}
.nav-mobile a {
  padding: 14px clamp(20px,5vw,60px);
  font-size: 16px;
  color: var(--fg);
  border-bottom: 1px solid var(--border);
  transition: color var(--dur), padding-left var(--dur);
}
.nav-mobile a:hover { color: var(--accent); padding-left: calc(clamp(20px,5vw,60px) + 8px); }

/* ══════════════════════════════════════════════════════════
   HERO (base layout — background-image/padding overrides in each page)
══════════════════════════════════════════════════════════ */
#hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 70px;
  background: var(--bg);
}
#hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: none;
  pointer-events: none;
}
.hero-inner {
  position: relative;
  z-index: 1;
  width: 100%;
}
.hero-content {
  max-width: 680px;
}

.hero-label {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-en);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 32px;
}

.hero-headline {
  font-family: var(--font-display);
  font-size: clamp(56px, 7.6vw, 96px);
  font-weight: 500;
  line-height: 1.02;
  color: var(--dark);
  letter-spacing: 0.02em;
}
.hero-headline em {
  display: block;
  font-style: normal;
  color: var(--accent);
  opacity: 0.72;
}

.page-project-case .case-title.hero-headline {
  max-width: 100%;
  font-size: clamp(37px, 4.1vw, 53px);
  line-height: 1.12;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.hero-rule {
  width: 60px;
  height: 2px;
  background: var(--accent);
  margin: 28px 0;
}

.hero-tagline {
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 500;
  color: var(--dark);
  letter-spacing: 0.08em;
  line-height: 1.5;
}

.hero-desc {
  margin-top: 20px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--muted);
  max-width: 500px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 40px;
}

/* ── Button system ──────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  font-size: 18px;
  font-weight: 600;
  font-family: var(--font-body);
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--dur) var(--ease);
  letter-spacing: 0.04em;
}
.btn::before {
  content: '\203A';
  font-weight: 900;
  font-size: 1.1em;
  line-height: 1;
}
.btn-primary {
  background: var(--accent);
  color: var(--surface);
  border-color: var(--accent);
}
.btn-primary:hover { background: var(--accent-dk); border-color: var(--accent-dk); transform: translateY(-1px); box-shadow: 0 6px 20px rgba(12,181,155,0.28); }
.btn-ghost {
  background: var(--surface);
  color: var(--accent);
  border-color: rgba(12,181,155,.45);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent-dk); }

/* Hero badges (index.html) */
.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 44px;
  padding-top: 34px;
  border-top: 1px solid var(--border);
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  max-width: max-content;
  padding: 6px 14px;
  border: 1px solid rgba(12,181,155,.38);
  background: #F3FAF8;
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  color: var(--accent-dk);
  letter-spacing: 0.14em;
  font-family: var(--font-en);
}

/* ══════════════════════════════════════════════════════════
   ABOUT SECTION
══════════════════════════════════════════════════════════ */
#about { background: var(--surface); }

.about-grid {
  display: grid;
  grid-template-columns: 5fr 6fr;
  gap: clamp(48px, 7vw, 100px);
  align-items: start;
}

.about-visual { position: relative; }
.about-img {
  width: 100%;
  aspect-ratio: 3/4;
  background: var(--surface);
  overflow: hidden;
  position: relative;
}
.about-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.about-stat-float {
  position: absolute;
  bottom: 0; right: -20px;
  background: var(--accent);
  color: var(--surface);
  padding: 22px 28px;
}
.about-stat-num {
  font-family: var(--font-en);
  font-size: 42px;
  font-weight: 700;
  line-height: 1;
}
.about-stat-label {
  font-size: 16px;
  margin-top: 4px;
  letter-spacing: 0.04em;
  opacity: 0.85;
}

.about-text { padding-top: 12px; }

.about-quote {
  margin: 32px 0;
  padding: 24px 28px;
  border-left: 2px solid var(--accent);
  background: var(--bg);
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.75;
  color: var(--dark);
}
.about-quote small {
  display: block;
  margin-top: 8px;
  font-size: 16px;
  font-family: var(--font-body);
  font-style: normal;
  color: var(--muted);
}

.about-patents {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}
.about-patents-label {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-transform: uppercase;
  font-family: var(--font-en);
  margin-bottom: 16px;
}
.patent-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-size: 16px;
  color: var(--fg);
}
.patent-row:last-child { border-bottom: none; }
.patent-dot {
  width: 6px; height: 6px;
  background: var(--accent);
  flex-shrink: 0;
}

/* ══════════════════════════════════════════════════════════
   BENEFITS
══════════════════════════════════════════════════════════ */
#benefits { background: var(--bg); }

.benefits-header {
  text-align: center;
  margin-bottom: 72px;
}
.benefits-header .sec-label {
  justify-content: center;
}
.benefits-header .sec-label::after { display: none; }
.benefits-header .sec-label::before {
  content: '';
  max-width: 48px;
  height: 1px;
  background: var(--accent);
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.benefit-card {
  background: var(--surface);
  padding: 44px 36px;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: background var(--dur) var(--ease);
}
.benefit-card:hover { background: #FFFFFF; }
.benefit-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}
.benefit-card:hover::before { transform: scaleX(1); }

.benefit-num {
  font-family: var(--font-en);
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  background: var(--accent);
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 24px;
  flex-shrink: 0;
}
.benefit-icon { display: none; }
.benefit-title {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 20px;
}
.benefit-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.benefit-list li {
  display: grid;
  grid-template-columns: 8px minmax(0, 1fr);
  align-items: start;
  column-gap: 10px;
  font-size: 16px;
  line-height: 1.7;
  color: var(--muted);
}
.benefit-list li::before {
  content: '';
  width: 4px; height: 4px;
  background: var(--accent);
  flex-shrink: 0;
  margin-top: 12px;
  justify-self: center;
}
.benefit-stat {
  margin-top: auto;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.benefit-stat-num {
  font-family: var(--font-en);
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 800;
  color: #FF6600;
  letter-spacing: -0.02em;
  line-height: 1;
}
.benefit-stat-label {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.04em;
}

/* ══════════════════════════════════════════════════════════
   HISTORY / TIMELINE
══════════════════════════════════════════════════════════ */
#history { background: var(--surface); }

.history-layout {
  display: block;
  max-width: 1120px;
}
.history-sidebar {
  position: static;
  max-width: 820px;
  margin-bottom: clamp(64px, 8vw, 104px);
}
.history-sidebar .sec-desc { font-size: 16px; }

.timeline {
  padding-top: 4px;
  max-width: 1080px;
}
.timeline-item {
  display: grid;
  grid-template-columns: 160px 48px minmax(0, 1fr);
  gap: 0 28px;
  padding-bottom: 76px;
  position: relative;
}
.timeline-item:last-child { padding-bottom: 0; }

.timeline-year {
  font-family: var(--font-en);
  font-size: 18px;
  font-weight: 700;
  color: var(--brand-deep);
  text-align: right;
  padding-top: 0;
  letter-spacing: 0.04em;
}
.timeline-item.active .timeline-year { color: var(--accent); }

.timeline-spine {
  width: 2px;
  background: var(--border);
  position: relative;
  flex-shrink: 0;
  justify-self: center;
}
.timeline-spine::before {
  content: '';
  position: absolute;
  top: 4px;
  left: 50%;
  transform: translateX(-50%);
  width: 18px; height: 18px;
  background: var(--accent);
  border: 3px solid var(--surface);
  border-radius: 999px;
  box-shadow: 0 0 0 1px rgba(12,181,155,.28);
  z-index: 1;
}
.timeline-item:last-child .timeline-spine {
  background: var(--border);
}

.timeline-content { padding-top: 0; }
.timeline-company {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 16px;
}
.timeline-item.active .timeline-company { color: var(--dark); }
.timeline-desc {
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

/* ══════════════════════════════════════════════════════════
   METHODS
══════════════════════════════════════════════════════════ */
#methods { background: #F7F7F7; }

.methods-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  background: #fff;
  border: 1px solid rgba(42,42,42,.14);
  margin-top: 60px;
}
.method-card {
  background: #FFFFFF;
  border: none;
  border-right: 1px solid rgba(42,42,42,.10);
  border-bottom: 1px solid rgba(42,42,42,.10);
  border-radius: 0;
  box-shadow: none;
  transition: none;
  overflow: hidden;
  position: relative;
}
.method-card:nth-child(even) { border-right: none; }
.method-card:nth-last-child(-n + 2) { border-bottom: none; }
.method-card.featured {
  background: #fff;
  border-top: none;
}
.method-card:hover {
  background: #FFFFFF;
  transform: none;
  box-shadow: none;
}

.method-card-head {
  padding: 28px 36px 24px;
  border-bottom: 1px solid rgba(42,42,42,.10);
  background: #FFFFFF;
  position: relative;
  min-height: 170px;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}
.method-card.featured .method-card-head {
  background: var(--accent);
  color: #fff;
  padding: 28px 36px 24px;
  min-height: 170px;
}
.method-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  max-width: max-content;
  align-self: flex-start;
  padding: 6px 14px;
  border: 1px solid rgba(12,181,155,.38);
  background: transparent;
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.14em;
  color: var(--accent-dk);
  margin-bottom: 0;
  text-transform: uppercase;
}
.method-card.featured .method-badge {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255,255,255,.75);
}
.method-name {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
  color: #2A2A2A;
  margin-top: 22px;
  line-height: 1.3;
}
.method-card.featured .method-name {
  color: #fff;
  font-size: 30px;
  line-height: 1.3;
}
.method-name::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--accent);
  margin-top: 16px;
}
.method-card.featured .method-name::after { background: #fff; }

.method-card-body { padding: 28px 36px 36px; }
.method-desc {
  font-size: 16px;
  line-height: 2;
  color: rgba(42,42,42,.72);
  margin-bottom: 20px;
}
.method-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.method-tag {
  padding: 4px 12px;
  border: 1px solid rgba(12,181,155,.15);
  background: #F3FAF8;
  font-size: 14px;
  color: #089B84;
  font-weight: 400;
}
.method-card.featured .method-tag {
  border-color: rgba(12,181,155,.15);
  background: #F3FAF8;
  color: #089B84;
}

.methods-cta {
  display: flex;
  justify-content: center;
  margin-top: 48px;
}

/* ══════════════════════════════════════════════════════════
   SPECS OVERVIEW CARDS
══════════════════════════════════════════════════════════ */
#specs { background: #F7F7F7; }

.specs-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 24px;
  background: transparent;
  border: none;
  margin-top: 56px;
}
.spec-card {
  background: #FFFFFF;
  border: 1px solid rgba(42,42,42,.08);
  border-radius: 0;
  padding: 28px 32px;
  min-height: 180px;
  box-shadow: none;
  transition: box-shadow var(--dur) var(--ease);
  position: relative;
}
@media (min-width: 1025px) {
  .spec-card:nth-child(-n+3) { grid-column: span 2; }
  .spec-card:nth-child(n+4) { grid-column: span 3; }
}
.spec-card:hover {
  background: #FFFFFF;
  border-color: rgba(42,42,42,.08);
  transform: none;
  box-shadow: 0 8px 24px rgba(0,0,0,.06);
}
.spec-num {
  font-family: var(--font-en);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: rgba(42,42,42,.04);
  margin-bottom: 16px;
}
.spec-title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: #2A2A2A;
  margin-bottom: 18px;
  padding-bottom: 0;
  border-bottom: 0;
}
.spec-items { display: flex; flex-direction: column; gap: 10px; }
.spec-item {
  display: grid;
  grid-template-columns: 8px minmax(0, 1fr);
  column-gap: 10px;
  font-size: 16px;
  color: rgba(42,42,42,.68);
  line-height: 1.7;
  padding-left: 0;
  position: relative;
}
.spec-item::before {
  content: '';
  position: static;
  display: block;
  margin-top: 11px;
  justify-self: center;
  width: 5px; height: 5px;
  border-radius: 999px;
  background: #0CB59B;
}

/* ══════════════════════════════════════════════════════════
   PROJECTS
══════════════════════════════════════════════════════════ */
#projects { background: var(--bg); }

.projects-header {
  display: block;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 52px;
}
.projects-header .sec-desc {
  margin-top: 18px;
  max-width: 720px;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.project-card {
  background: var(--surface);
  transition: background var(--dur) var(--ease);
}
.project-card:hover { background: #FFFFFF; }
.project-img {
  width: 100%;
  aspect-ratio: 4/3;
  background: var(--dark-mid);
  display: flex; align-items: center; justify-content: center;
  position: relative;
  overflow: hidden;
}
.project-img::before {
  content: '';
  position: absolute; inset: 0;
  background: none;
}
.project-img-ph {
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  color: rgba(255,255,255,0.15);
}
.project-img-ph svg { width: 36px; height: 36px; }
.project-img-ph span { font-size: 16px; letter-spacing: 0.14em; font-family: var(--font-en); }
.project-img img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform 0.45s var(--ease); }
.project-card:hover .project-img img { transform: scale(1.04); }
.projects-more { text-align: center; margin-top: clamp(36px, 5vw, 56px); }

.project-meta { padding: 22px 24px 28px; }
.project-location {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-en);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 9px;
}
.project-location svg { width: 10px; height: 10px; }
.project-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 8px;
  line-height: 1.4;
}
.project-desc {
  font-size: 16px;
  color: var(--muted);
  line-height: 1.75;
}

/* ══════════════════════════════════════════════════════════
   CONTACT
══════════════════════════════════════════════════════════ */
#contact {
  background: #F7F7F7;
  color: #2A2A2A;
  position: relative;
  overflow: hidden;
}
.contact-header {
  text-align: center;
  margin-bottom: 60px;
}
.contact-header .eyebrow {
  display: block;
  font-family: var(--font-en);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: #0CB59B;
  margin-bottom: 18px;
}
.contact-header .section-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 46px);
  font-weight: 700;
  line-height: 1.2;
  color: #2A2A2A;
  letter-spacing: -0.01em;
}
.contact-header .section-desc {
  font-size: 16px;
  line-height: 1.9;
  color: rgba(42,42,42,.72);
  max-width: 720px;
  margin: 14px auto 0;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  margin-bottom: 48px;
  background: #FFFFFF;
  border: 1px solid rgba(42,42,42,.08);
  border-radius: var(--r-lg);
  overflow: hidden;
}
.contact-card {
  background: #FFFFFF;
  border: 1px solid rgba(42,42,42,.08);
  border-radius: 0;
  padding: 36px 32px;
  box-shadow: none;
}
.contact-card:first-child {
  border-right: none;
}
.contact-card + .contact-card {
  border-left: 1px solid rgba(42,42,42,.08);
}
.contact-card-label {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(12,181,155,.10);
  border: 1px solid rgba(12,181,155,.24);
  border-radius: 100px;
  font-size: 14px;
  color: #089B84;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}
.contact-card-name {
  font-size: 20px;
  font-weight: 700;
  color: #2A2A2A;
  margin-bottom: 20px;
  line-height: 1.3;
}
.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: 13px;
}
.contact-info-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}
.contact-info-icon {
  width: 32px; height: 32px;
  background: rgba(12,181,155,.10);
  border-radius: var(--r-sm);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  color: #089B84;
}
.contact-info-icon svg { width: 15px; height: 15px; }
.contact-info-text {
  font-size: 16px;
  line-height: 1.6;
  color: rgba(42,42,42,.72);
  min-width: 0;
  overflow-wrap: anywhere;
}
.contact-info-text a {
  color: #2A2A2A;
  font-weight: 400;
  transition: color var(--dur) var(--ease);
}
.contact-info-text a:hover { color: #0CB59B; }
.contact-divider { color: rgba(42,42,42,.22); margin: 0 6px; }

.contact-person {
  background: #FFFFFF;
  border: 1px solid rgba(42,42,42,.08);
  border-radius: var(--r-md);
  padding: 24px 28px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  box-shadow: none;
}
.contact-person-avatar {
  width: 52px; height: 52px;
  background: #0CB59B;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: #FFFFFF;
  font-size: 20px;
  font-weight: 700;
  flex-shrink: 0;
}
.contact-person-name { font-size: 17px; font-weight: 700; color: #2A2A2A; }
.contact-person-title { font-size: 16px; color: rgba(42,42,42,.72); margin-top: 2px; }
.contact-person-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-left: auto;
  min-width: 0;
}
.contact-person-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: #0CB59B;
  border: 1px solid #0CB59B;
  border-radius: var(--r-sm);
  font-size: 16px;
  color: #FFFFFF;
  transition: var(--dur) var(--ease);
  min-width: 0;
  overflow-wrap: anywhere;
}
.contact-person-link:hover { background: #089B84; border-color: #089B84; color: #FFFFFF; }
.contact-person-link svg { width: 14px; height: 14px; }

.dealers {
  margin-top: 48px;
  padding-top: 40px;
  border-top: 1px solid rgba(255,255,255,.60);
}
.dealers-title {
  font-size: 16px;
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-family: var(--font-en);
  margin-bottom: 20px;
}
.dealers-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 48px;
  max-width: 980px;
}
.dealer-chip {
  position: relative;
  padding: 4px 0 4px 28px;
  background: transparent;
  border: 0;
  border-radius: 0;
}
.dealer-chip::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  border-radius: 2px;
  background: rgba(255,255,255,.32);
}
.dealer-chip-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px 0;
  margin-bottom: 10px;
}
.dealer-chip-region {
  color: rgba(255,255,255,.82);
  font-size: 17px;
  line-height: 1.4;
  font-weight: 500;
  white-space: nowrap;
}
.dealer-chip-region::after {
  content: "｜";
  margin: 0 10px;
  color: rgba(255,255,255,.4);
}
.dealer-chip-name {
  color: #fff;
  font-size: 20px;
  line-height: 1.4;
  font-weight: 700;
}
.dealer-chip-scope {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  margin-bottom: 10px;
  padding: 4px 10px;
  border-radius: 4px;
  background: rgba(255,255,255,.18);
  color: #fff;
  font-size: 15px;
  line-height: 1.45;
  font-weight: 600;
}
.dealer-chip-tel {
  display: block;
  color: #fff;
  font-size: 18px;
  line-height: 1.5;
  letter-spacing: .02em;
  font-family: var(--font-en);
}

/* ══════════════════════════════════════════════════════════
   INTRO DETAIL PAGE — hero two-column layout
   (shared by: about.html, feature.html, intro.html, materials.html,
    projects.html, spec01-05.html)
══════════════════════════════════════════════════════════ */
#hero.intro-hero {
  min-height: auto;
  padding: 154px 0 96px;
  background: var(--bg);
  background-image: none;
  border-bottom: 1px solid var(--border);
}
#hero.intro-hero::before { display: none; }
#hero.intro-hero .hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(340px, 420px);
  align-items: center;
  gap: clamp(42px, 6vw, 84px);
  max-width: 1100px;
}
.intro-hero .hero-content {
  max-width: 760px;
}
.intro-hero .hero-headline {
  font-size: clamp(46px, 5.7vw, 76px);
  line-height: 1.08;
  white-space: nowrap;
  max-width: none;
}
.intro-hero .hero-desc {
  max-width: 820px;
  color: var(--muted);
}
.intro-system-map {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 34px 32px;
}
.system-map-label {
  font-family: var(--font-en);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--accent);
  margin-bottom: 18px;
}
.system-map-title {
  font-family: var(--font-display);
  font-size: clamp(18px, 1.75vw, 24px);
  line-height: 1.32;
  color: var(--fg);
  margin-bottom: 28px;
}
.system-map-list {
  display: grid;
  border-top: 1px solid var(--border);
}
.system-map-item {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
  color: var(--fg);
  font-weight: 600;
  line-height: 1.55;
  font-size: 16px;
}
.system-map-item:last-child { border-bottom: none; }
.system-map-item > span:first-child {
  font-family: var(--font-en);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--accent-dk);
}
.system-map-copy {
  min-width: 0;
  font: inherit;
  letter-spacing: 0;
  color: inherit;
}
.text-nowrap {
  white-space: nowrap;
}

/* ── Split layout (intro / spec pages) ──────────────────── */
.split-layout {
  display: grid;
  grid-template-columns: minmax(260px, .44fr) minmax(0, .78fr);
  gap: clamp(36px, 6vw, 76px);
  align-items: start;
}
.section-copy {
  position: static;
  top: auto;
}
#efficiency .section-copy {
  position: static;
  max-width: 760px;
  margin-bottom: 48px;
}
#efficiency .comparison-table {
  width: 100%;
}

/* ── Retina+ explainer ─────────────────────────────────── */
.retina-plus-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 32px;
}
.retina-plus-grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.retina-plus-card--wide {
  grid-column: 1 / -1;
}
.retina-plus-card {
  padding: 32px 28px;
  border: 1px solid var(--border);
  background: var(--surface);
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}
.retina-plus-card h3 {
  margin: 0 0 15px;
  color: var(--fg);
  font-size: 20px;
  line-height: 1.45;
  font-weight: 700;
}
.retina-plus-card p {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.8;
}

/* ── Comparison table ───────────────────────────────────── */
.comparison-table {
  background: var(--surface);
  border: 1px solid var(--border);
  overflow: hidden;
}
.comparison-row {
  display: grid;
  grid-template-columns: minmax(108px, .42fr) minmax(0, 1fr) minmax(0, 1.08fr);
  border-bottom: 1px solid var(--border);
}
.comparison-row:last-child { border-bottom: none; }
.comparison-cell {
  min-height: 62px;
  padding: 18px 20px;
  border-right: 1px solid var(--border);
  font-size: 16px;
  line-height: 1.65;
  color: var(--muted);
  display: flex;
  align-items: center;
}
.comparison-cell:last-child { border-right: none; }
.comparison-cell.label {
  font-weight: 700;
  color: var(--fg);
  background: rgba(42,42,42,.025);
}
.comparison-head .comparison-cell {
  min-height: 74px;
  font-weight: 700;
  color: var(--fg);
  font-family: var(--font-display);
  font-size: 20px;
}
.comparison-cell.jinlong {
  color: var(--fg);
  background: var(--accent-pale);
}
.comparison-head .comparison-cell.jinlong {
  color: var(--accent-dk);
}

/* ── Method compare grid ────────────────────────────────── */
.method-compare-grid {
  margin-top: 56px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  border: 1px solid var(--border);
  background: var(--surface);
}
.method-compare-card {
  padding: 42px 40px;
  background: var(--surface);
  border-right: 1px solid var(--border);
}
.method-compare-card:last-child { border-right: none; }
.method-compare-card.accent {
  background: var(--accent);
  color: var(--surface);
}
.method-compare-title {
  font-family: var(--font-display);
  font-size: clamp(20px, 2vw, 28px);
  line-height: 1.2;
  margin-bottom: 28px;
  color: var(--fg);
}
.method-compare-card.accent .method-compare-title {
  color: var(--surface);
}
.check-list {
  display: grid;
  gap: 14px;
}
.check-list li {
  display: grid;
  grid-template-columns: 10px 1fr;
  gap: 14px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}
.check-list li::before {
  content: '';
  width: 6px;
  height: 6px;
  margin-top: .72em;
  border-radius: 50%;
  background: var(--accent);
}
.method-compare-card.accent .check-list li {
  color: rgba(255,255,255,.86);
}
.method-compare-card.accent .check-list li::before {
  background: var(--surface);
}

/* ── TCO module ─────────────────────────────────────────── */
.tco-module {
  margin-top: 56px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px minmax(0, 1fr);
  border: 1px solid var(--border);
  background: var(--surface);
}
.tco-panel {
  padding: 36px 34px;
  border-right: 1px solid var(--border);
}
.tco-panel:last-child { border-right: none; }
.tco-title {
  font-family: var(--font-display);
  font-size: 28px;
  line-height: 1.25;
  color: var(--fg);
  margin-bottom: 24px;
}
.tco-list {
  display: grid;
  gap: 12px;
}
.tco-list li {
  font-size: 16px;
  line-height: 1.7;
  color: var(--muted);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.tco-list li:last-child { border-bottom: none; padding-bottom: 0; }
.tco-result {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  background: var(--accent-pale);
  padding: 36px 28px;
}
.tco-kicker {
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--accent-dk);
  font-weight: 700;
  margin-bottom: 18px;
}
.tco-number {
  font-family: var(--font-en);
  font-size: clamp(56px, 7vw, 92px);
  font-weight: 700;
  line-height: .95;
  letter-spacing: -.05em;
  color: var(--accent);
}
.tco-note {
  margin-top: 24px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}
.tco-bars {
  display: grid;
  gap: 12px;
  margin-top: 24px;
  width: 100%;
}
.tco-bar-row {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  font-size: 14px;
  color: var(--muted);
}
.bar-track {
  height: 8px;
  background: rgba(42,42,42,.10);
  overflow: hidden;
}
.bar-track i {
  display: block;
  height: 100%;
  background: var(--accent);
}

/* ── Site grid ──────────────────────────────────────────── */
.site-grid {
  margin-top: 56px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border: 1px solid var(--border);
  background: var(--surface);
}
.site-card {
  min-height: 154px;
  padding: 30px 28px;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.site-card:nth-child(3n) { border-right: none; }
.site-card:nth-last-child(-n + 3) { border-bottom: none; }
.site-num {
  font-family: var(--font-en);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--accent);
  font-weight: 700;
}
.site-title {
  font-family: var(--font-display);
  font-size: 26px;
  line-height: 1.25;
  color: var(--fg);
}

/* ── Trust layout ───────────────────────────────────────── */
.trust-layout {
  margin-top: 56px;
  display: grid;
  grid-template-columns: minmax(0, .72fr) minmax(0, 1fr);
  gap: 0;
  border: 1px solid var(--border);
  background: var(--surface);
}
.trust-stats {
  padding: 42px 40px;
  border-right: 1px solid var(--border);
  display: grid;
  gap: 28px;
}
.trust-stat-num {
  font-family: var(--font-en);
  font-size: clamp(54px, 7vw, 86px);
  font-weight: 700;
  line-height: .9;
  color: var(--accent);
  letter-spacing: -.05em;
}
.trust-stat-text {
  font-size: 18px;
  line-height: 1.75;
  color: var(--fg);
  font-weight: 700;
}
.certificate-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  background: var(--border);
  gap: 1px;
}
.certificate-card {
  min-height: 190px;
  padding: 28px 24px;
  background: var(--surface);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.certificate-mark {
  width: 44px;
  height: 44px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--surface);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-en);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: .02em;
}
.certificate-title {
  color: var(--fg);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.6;
}

/* ══════════════════════════════════════════════════════════
   FAQ
══════════════════════════════════════════════════════════ */
.faq-header {
  position: static;
  max-width: 760px;
  margin-bottom: 48px;
}
.faq-list {
  display: grid;
  max-width: none;
  width: 100%;
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: 0 24px 60px rgba(20,40,34,0.06);
}
.faq-list details {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.faq-list details:last-child { border-bottom: none; }
.faq-list summary {
  cursor: pointer;
  padding: 24px 28px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--fg);
  list-style: none;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: '+';
  float: right;
  color: var(--accent);
  font-family: var(--font-en);
  font-weight: 700;
}
.faq-list details[open] summary::after { content: '−'; }
.faq-list p {
  padding: 0 28px 26px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

/* ══════════════════════════════════════════════════════════
   RESOURCE CTA + FOOTER
══════════════════════════════════════════════════════════ */
.resource-cta {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.resource-box {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 36px;
  align-items: center;
  padding: clamp(72px, 9vw, 110px) 0;
}
.resource-box .sec-title {
  font-size: clamp(32px, 4.6vw, 56px);
}
.resource-cta .sec-desc {
  max-width: 640px;
  margin-top: 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}
.resource-copy { max-width: 640px; }
.resource-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: max-content;
  flex-shrink: 0;
}
.resource-actions .btn { min-width: 180px; }

.technical-resource {
  background: var(--surface);
  border-top: 1px solid var(--border);
}
.technical-resource .resource-box {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 36px;
  align-items: center;
  padding: clamp(72px, 9vw, 110px) 0;
}
.technical-resource .sec-title {
  font-size: clamp(36px, 5vw, 64px);
}
.technical-resource .sec-desc {
  max-width: none;
  white-space: nowrap;
}
.technical-resource .btn {
  white-space: nowrap;
}

/* ══════════════════════════════════════════════════════════
   FOOTER
══════════════════════════════════════════════════════════ */
footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 36px 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}
.footer-logo {
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
}
.footer-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}
.footer-name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  color: var(--fg);
}
.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
}
.footer-nav a {
  padding: 4px 12px;
  font-size: 16px;
  color: var(--dark-mid);
  transition: color var(--dur);
  border-right: 1px solid var(--border);
}
.footer-nav a:last-child { border-right: none; }
.footer-nav a:hover { color: var(--accent); }
.footer-copy {
  font-family: var(--font-en);
  font-size: 16px;
  color: var(--muted);
  letter-spacing: 0.04em;
}

/* Intellectual property notice — footer, light gray on light footer surface */
.footer-legal {
  width: 100%;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.footer-legal-title {
  margin-bottom: 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--muted);
}
.footer-legal p {
  margin: 0;
  max-width: 1120px;
  font-size: 13px;
  line-height: 1.85;
  color: var(--muted);
}
@media (max-width: 640px) {
  .footer-legal { margin-top: 20px; padding-top: 16px; }
  .footer-legal p { font-size: 12px; line-height: 1.8; }
}

/* Mobile-only "back to top" button — shown after scrolling past Section 2 */
.gotop-btn {
  display: none;
  position: fixed;
  right: 16px;
  bottom: 16px;
  width: 44px;
  height: 44px;
  padding: 0;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 6px 18px rgba(0,0,0,.22);
  cursor: pointer;
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity .25s ease, transform .25s ease;
  z-index: 80;
}
.gotop-btn.is-visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.gotop-btn svg { width: 20px; height: 20px; display: block; }
@media (max-width: 820px) {
  .gotop-btn { display: flex; }
  .dealers-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

/* ══════════════════════════════════════════════════════════
   RESPONSIVE
══════════════════════════════════════════════════════════ */
@media (max-width: 1024px) {
  .nav-links a { padding-inline: 10px; }
  .nav-links .nav-phone {
    margin-left: 8px;
    padding-inline: 14px;
    gap: 6px;
  }
  .specs-grid { grid-template-columns: repeat(2, 1fr); }
  .spec-card { grid-column: auto; }
  #hero.intro-hero .hero-inner,
  .split-layout,
  .trust-layout,
  .resource-box { grid-template-columns: 1fr; }
  .section-copy { position: static; }
  .tco-module { grid-template-columns: 1fr; }
  .tco-panel { border-right: none; border-bottom: 1px solid var(--border); }
  .tco-panel:last-child { border-bottom: none; }
  .trust-stats { border-right: none; border-bottom: 1px solid var(--border); }
  .technical-resource .resource-box { grid-template-columns: 1fr; }
  .technical-resource .sec-desc { white-space: normal; }
}

@media (max-width: 820px) {
  .nav-inner { padding: 0 clamp(16px, 4vw, 28px); }
  .nav-brand-name {
    max-width: min(58vw, 360px);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .nav-brand-name small { display: none; }
  .nav-links  { display: none; }
  .nav-burger { display: flex; }

  .about-grid  { grid-template-columns: 1fr; }
  .about-stat-float { right: 0; }
  .benefits-grid { grid-template-columns: 1fr; }
  .methods-grid  { grid-template-columns: 1fr; }
  .method-card {
    border-right: none;
    border-bottom: 1px solid rgba(42,42,42,.10);
  }
  .method-card:last-child { border-bottom: none; }
  .specs-grid    { grid-template-columns: 1fr; }
  .spec-card     { grid-column: auto; }
  .retina-plus-grid,
  .retina-plus-grid--3 { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid  { grid-template-columns: 1fr; }
  .timeline-item { grid-template-columns: 118px 36px minmax(0, 1fr); gap: 0 18px; }
  .timeline-year { font-size: 16px; }
  .timeline-company { font-size: 22px; }
  .contact-card { padding: 36px 32px; }
  .contact-info-text { font-size: 16px; }
  .contact-person { padding: 24px 28px; }
  .contact-person-link { font-size: 16px; }

  #hero.intro-hero { padding: 124px 0 72px; }
  .intro-hero .hero-headline { white-space: normal; font-size: clamp(42px, 13vw, 62px); }
  .intro-system-map { padding: 28px 24px; }
  .system-map-copy {
    white-space: nowrap;
  }
  .method-compare-grid { grid-template-columns: 1fr; }
  .site-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .method-compare-card {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  .method-compare-card:last-child { border-bottom: none; }
  .site-card {
    border-right: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
  }
  .site-card:nth-child(3n) { border-right: 1px solid var(--border); }
  .site-card:nth-child(even) { border-right: none; }
  .site-card:nth-last-child(-n + 3) { border-bottom: 1px solid var(--border); }
  .site-card:nth-last-child(-n + 2) { border-bottom: none; }
  .comparison-table {
    border: none;
    background: transparent;
    display: grid;
    gap: 14px;
  }
  .comparison-row,
  .comparison-head {
    display: grid;
    grid-template-columns: 1fr;
    border: 1px solid var(--border);
    background: var(--surface);
  }
  .comparison-head { display: none; }
  .comparison-cell {
    border-right: none;
    border-bottom: 1px solid var(--border);
    min-height: auto;
    padding: 14px 16px;
  }
  .comparison-cell.traditional,
  .comparison-cell.jinlong {
    display: grid;
    grid-template-columns: max-content 1fr;
    column-gap: 1.25em;
    align-items: start;
  }
  .comparison-cell.jinlong { background: var(--accent-pale); }
  .comparison-cell:last-child { border-bottom: none; }
  .comparison-cell.label {
    background: var(--surface);
    color: var(--accent-dk);
  }
  .comparison-cell.traditional::before,
  .comparison-cell.jinlong::before {
    display: block;
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    font-weight: 700;
    letter-spacing: 0;
    color: var(--muted);
    text-transform: none;
    margin-bottom: 0;
  }
  .comparison-cell.traditional::before { content: '傳統'; }
  .comparison-cell.jinlong::before { content: '勁龍'; }

  .footer-inner { flex-direction: column; align-items: center; gap: 16px; }
  .footer-nav { gap: 0; justify-content: center; }
}

@media (max-width: 560px) {
  .container { padding-inline: 24px; }
  .nav-inner {
    height: 64px;
    padding-inline: 16px;
  }
  .nav-brand { gap: 10px; }
  .nav-logo-mark { width: 34px; height: 34px; }
  .nav-brand-name {
    max-width: calc(100vw - 110px);
    font-size: 16px;
  }
  #hero { padding-top: 88px; padding-bottom: 72px; }
  .hero-content { max-width: 100%; }
  .hero-label {
    max-width: 100%;
    font-size: 12px;
    letter-spacing: 0.22em;
    margin-bottom: 24px;
  }
  .hero-headline { font-size: clamp(48px, 16vw, 72px); }
  .page-project-case .case-title.hero-headline {
    max-width: 100%;
    font-size: clamp(32px, 9.5vw, 47px);
    line-height: 1.15;
    white-space: normal;
  }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-badges {
    gap: 14px;
    margin-top: 42px;
    padding-top: 32px;
    padding-bottom: 68px;
  }
  .btn { justify-content: center; }
  .nav-mobile a {
    padding-top: calc(14px + 0.25em);
    padding-bottom: calc(14px + 0.25em);
  }
  .sec-label,
  .sec-title,
  .sec-desc,
  .section-desc {
    max-width: 100%;
  }
  .benefits-header .sec-label {
    justify-content: flex-start !important;
  }
  .benefits-header .sec-title,
  .benefits-header .sec-desc,
  .contact-header {
    text-align: left !important;
  }
  .benefits-header .sec-desc,
  .contact-header .section-desc {
    margin-left: 0 !important;
    margin-right: 0 !important;
  }
  .method-card-head {
    min-height: auto;
    padding: 28px 24px 24px;
  }
  .method-name { font-size: 24px; }
  .method-card.featured .method-card-head {
    min-height: auto;
    padding: 30px 24px 28px;
  }
  .method-card.featured .method-name { font-size: 26px; }
  .specs-grid    { grid-template-columns: 1fr; }
  .spec-card     { grid-column: auto; }
  .projects-grid { grid-template-columns: 1fr; }
  .contact-card { padding: 28px 22px 32px; }
  .contact-info-row { gap: 14px; }
  .contact-info-icon { width: 42px; height: 42px; }
  .contact-person {
    flex-direction: column;
    align-items: flex-start;
    padding: 24px 22px;
  }
  .contact-person-links {
    width: 100%;
    margin-left: 0;
  }
  .contact-person-link {
    width: 100%;
    justify-content: flex-start;
  }
  .dealer-chip { padding-left: 20px; }
  .dealer-chip-head { gap: 6px 14px; }
  .dealer-chip-region { font-size: 16px; }
  .dealer-chip-name { font-size: 18px; }
  .dealer-chip-tel { font-size: 17px; }
  .timeline-item {
    grid-template-columns: 1fr;
    gap: 6px;
    padding-bottom: 32px;
  }
  .timeline-year {
    text-align: left;
    padding-top: 0;
    margin-bottom: 0;
  }
  .timeline-spine { display: none; }
  .timeline-spine::before { display: none; }
  .timeline-company {
    font-size: 22px;
    margin-bottom: 8px;
  }
  .timeline-desc { line-height: 1.75; }
  .footer-inner {
    justify-content: center;
    text-align: center;
  }
  .footer-nav {
    width: 100%;
    justify-content: center;
  }
  .footer-copy {
    width: 100%;
    text-align: center;
  }
  .method-compare-card,
  .tco-panel,
  .trust-stats,
  .certificate-card,
  .site-card { padding: 28px 22px; }
  .certificate-grid { grid-template-columns: 1fr; }
  .intro-hero .hero-headline { font-size: clamp(42px, 13vw, 62px); }
  .resource-box { gap: 28px; padding: 56px 0; }
  .faq-list summary { padding: 22px; font-size: 17px; }
  .faq-list p { padding: 0 22px 24px; }
  .technical-resource .resource-box { padding: 56px 0; }

  /* Overflow wrap for small screens */
  .hero-headline,
  .sec-title,
  .system-map-title,
  .resource-box .sec-title,
  .technical-resource .sec-title {
    white-space: normal !important;
    overflow-wrap: anywhere;
  }
  .hero-actions,
  .resource-box,
  .footer-nav,
  .nav-mobile { min-width: 0; }
  .hero-actions .btn,
  .resource-box .btn,
  .section-py .btn {
    width: 100%;
    max-width: 100%;
    min-width: 0 !important;
    justify-content: center;
    text-align: center;
  }
  .material-category-grid,
  .use-flow-grid,
  .specs-grid,
  .feature-grid,
  .application-grid { grid-template-columns: 1fr !important; }
  .footer-nav { justify-content: center; text-align: center; }
}

/* ── Scroll fade ─────────────────────────────────────────── */
.fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ── SEO / a11y / RWD hardening ─────────────────────────── */
main { display: block; }
[id] { scroll-margin-top: 112px; }
.table-scroll,
.spec-table-wrap,
.comparison-table,
.tco-module { width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }
.table-scroll table,
.spec-table-wrap table,
.comparison-table table { min-width: 640px; }
table caption {
  text-align: left;
  font-weight: 700;
  color: var(--dark);
  padding: 0 0 12px;
}
.nav-burger:focus-visible,
a:focus-visible,
button:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }