:root {
  --color-bg: #f4f5f8;
  --color-bg-alt: #fff;
  --color-deep: #0a1628;
  --color-accent: #1e3a5f;
  --color-accent-light: #2563eb;
  --color-accent-glow: rgba(37, 99, 235, 0.4);
  --color-muted: #64748b;
  --color-border: #e2e8f0;
  --color-text: #1e293b;
  --color-text-muted: #475569;

  --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", "Consolas", "Monaco", monospace;

  --nav-width: 200px;
  --content-max: 1000px;
  --section-pad: clamp(40px, 6vw, 80px);
  --gap: 20px;

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition: 0.35s var(--ease);
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  overflow-x: hidden;
}

.icon-sprite { position: absolute; width: 0; height: 0; overflow: hidden; }

.icon-sprite svg,
.nav-icon svg,
.section-icon svg,
.product-hero-icon svg,
.product-note-icon svg,
.design-icon svg,
.security-doc-icon svg,
.security-badge svg,
.scenario-cell-icon svg,
.scenario-overlay-icon svg,
.faq-term-icon svg,
.contact-icon svg {
  width: 1em;
  height: 1em;
  display: block;
}

.nav-side {
  position: fixed;
  left: 0; top: 0; bottom: 0;
  width: var(--nav-width);
  background: var(--color-deep);
  z-index: 100;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition);
  box-shadow: 4px 0 24px rgba(0,0,0,0.15);
}

.nav-side-inner {
  flex: 1;
  padding: 28px 0 20px 24px;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  margin-bottom: 40px;
  transition: transform var(--transition);
}

.nav-logo:hover { transform: translateX(4px); }

.nav-logo-img {
  width: 36px;
  height: 36px;
  object-fit: contain;
  border-radius: 8px;
  transition: transform 0.4s var(--ease-spring);
}

.nav-logo:hover .nav-logo-img { transform: scale(1.08) rotate(-3deg); }

.nav-logo-text {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  letter-spacing: 0.02em;
}

.nav-chapters { list-style: none; margin: 0; padding: 0; }

.nav-chapters li { margin-bottom: 2px; }

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  margin: 0 -12px 0 -10px;
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  font-size: 12px;
  transition: all var(--transition);
  border-left: 3px solid transparent;
  border-radius: 0 8px 8px 0;
}

.nav-link:hover {
  color: rgba(255, 255, 255, 0.95);
  background: rgba(255,255,255,0.06);
}

.nav-link.active {
  color: #fff;
  border-left-color: var(--color-accent-light);
  background: rgba(37, 99, 235, 0.12);
  box-shadow: inset 0 0 20px rgba(37,99,235,0.08);
}

.nav-icon {
  width: 18px;
  height: 18px;
  opacity: 0.8;
  flex-shrink: 0;
  transition: transform var(--transition);
}

.nav-link:hover .nav-icon,
.nav-link.active .nav-icon {
  transform: scale(1.15);
  opacity: 1;
}

.nav-link.active .nav-icon {
  color: var(--color-accent-light);
}

.nav-num { display: none; }

.nav-footer {
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-copy { font-size: 10px; color: rgba(255, 255, 255, 0.4); }

.mobile-header {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 56px;
  background: var(--color-deep);
  z-index: 99;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.2);
}

.mobile-header-logo {
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  text-decoration: none;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: none;
  background: rgba(255,255,255,0.1);
  color: #fff;
  cursor: pointer;
  border-radius: 10px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  transition: background var(--transition);
}

.nav-toggle:hover { background: rgba(255,255,255,0.2); }

.nav-toggle:hover {
  transform: scale(1.05);
  box-shadow: 0 12px 32px rgba(0,0,0,0.3);
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: var(--transition);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

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

.nav-side.open::before {
  content: "";
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: -1;
  animation: fadeIn 0.25s ease;
  backdrop-filter: blur(4px);
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.main-content { margin-left: var(--nav-width); min-height: 100vh; }

.section-cover {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 60px var(--section-pad) 80px;
  color: #fff;
  overflow: hidden;
}

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

.cover-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s var(--ease);
}

.cover-bg:hover img,
.section-cover:hover .cover-bg img {
  transform: scale(1.05);
}

.cover-glow {
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 120%;
  height: 80%;
  background: radial-gradient(ellipse at center, rgba(37,99,235,0.25) 0%, transparent 70%);
  z-index: 1;
  pointer-events: none;
  animation: glowPulse 8s ease-in-out infinite;
}

@keyframes glowPulse {
  0%, 100% { opacity: 0.6; transform: translateX(-50%) scale(1); }
  50% { opacity: 1; transform: translateX(-50%) scale(1.1); }
}

.cover-grid {
  position: absolute;
  inset: 0;
  z-index: 1;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
  0% { transform: translate(0, 0); }
  100% { transform: translate(60px, 60px); }
}

.cover-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10,22,40,0.88) 0%, rgba(10,22,40,0.5) 50%, rgba(30,58,95,0.4) 100%);
  z-index: 2;
}

.cover-inner {
  position: relative;
  z-index: 3;
  max-width: var(--content-max);
  margin: 0 auto;
}

.cover-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  opacity: 0.85;
  margin-bottom: 16px;
  animation: slideUp 0.8s var(--ease-out) both;
}

.cover-label-icon {
  width: 16px;
  height: 16px;
  opacity: 0.9;
  animation: iconFloat 3s ease-in-out infinite;
}

@keyframes iconFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

.cover-title {
  font-size: clamp(48px, 10vw, 96px);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  margin: 0 0 16px;
  background: linear-gradient(135deg, #fff 0%, rgba(255,255,255,0.9) 50%, rgba(200,220,255,0.95) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: titleReveal 1s var(--ease-out) 0.2s both;
}

.cover-title-line {
  display: inline-block;
  animation: titleShine 4s ease-in-out infinite;
}

@keyframes titleShine {
  0%, 100% { filter: brightness(1); }
  50% { filter: brightness(1.15); }
}

.cover-subtitle {
  font-size: clamp(14px, 2vw, 18px);
  opacity: 0.9;
  margin: 0 0 24px;
  animation: slideUp 0.8s var(--ease-out) 0.35s both;
}

.cover-desc {
  max-width: 460px;
  font-size: 14px;
  opacity: 0.88;
  margin: 0;
  line-height: 1.75;
  animation: slideUp 0.8s var(--ease-out) 0.5s both;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes titleReveal {
  from {
    opacity: 0;
    transform: translateY(50px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.cover-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 10px;
  letter-spacing: 0.15em;
  color: rgba(255,255,255,0.8);
  text-decoration: none;
  transition: transform var(--transition);
  animation: bounce 2s ease-in-out infinite;
}

.cover-scroll:hover {
  color: #fff;
  transform: translateX(-50%) translateY(4px);
}

.cover-scroll-icon {
  width: 24px;
  height: 24px;
  animation: scrollArrow 1.5s ease-in-out infinite;
}

@keyframes scrollArrow {
  0%, 100% { transform: translateY(0); opacity: 0.7; }
  50% { transform: translateY(6px); opacity: 1; }
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

.section { padding: var(--section-pad); max-width: 1200px; margin: 0 auto; }

.section-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-accent-light);
  margin-bottom: 6px;
}

.section-title { font-size: clamp(24px, 3.5vw, 32px); font-weight: 600; margin: 0; letter-spacing: -0.01em; }

.section-header { margin-bottom: 40px; position: relative; }

.section-icon {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  opacity: 0.2;
  color: var(--color-accent-light);
  transition: all var(--transition);
}

.section-header:hover .section-icon,
.section-header.visible .section-icon {
  opacity: 0.5;
  transform: translateY(-50%) scale(1.1);
}

.section-header-center { text-align: center; }

.section-icon-center { left: 50%; right: auto; transform: translate(-50%, -50%); }

.section-brand { background: var(--color-bg-alt); }

.brand-spread {
  display: grid;
  grid-template-columns: 45% 1fr;
  gap: 48px;
  align-items: center;
}

.brand-visual-block {
  position: relative;
  aspect-ratio: 1;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.12);
}

.brand-visual-frame {
  position: absolute;
  inset: -2px;
  border: 2px solid rgba(37,99,235,0.3);
  border-radius: 14px;
  z-index: 1;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition);
}

.brand-visual-block:hover .brand-visual-frame { opacity: 1; }

.brand-visual-block img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s var(--ease);
}

.brand-visual-block:hover img { transform: scale(1.08); }

.brand-lead {
  font-size: 17px;
  font-weight: 500;
  color: var(--color-deep);
  margin: 20px 0 16px;
}

.brand-editorial p { margin: 0 0 14px; color: var(--color-text-muted); font-size: 15px; }

.section-product { background: var(--color-bg); }

.product-map {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto;
  gap: var(--gap);
}

.product-hero {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  min-height: 280px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.1);
}

.product-hero-shine {
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, transparent 40%, rgba(255,255,255,0.15) 50%, transparent 60%);
  z-index: 1;
  transform: translateX(-100%);
  transition: transform 0.8s var(--ease);
  pointer-events: none;
}

.product-hero:hover .product-hero-shine { transform: translateX(100%); }

.product-hero img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s var(--ease);
}

.product-hero:hover img { transform: scale(1.06); }

.product-hero-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 28px;
  background: linear-gradient(to top, rgba(10,22,40,0.95), rgba(10,22,40,0.6), transparent);
  color: #fff;
  transition: padding var(--transition);
}

.product-hero:hover .product-hero-caption { padding-bottom: 32px; }

.product-hero-icon {
  width: 28px;
  height: 28px;
  margin-bottom: 10px;
  opacity: 0.95;
  display: block;
  transition: transform var(--transition);
}

.product-hero:hover .product-hero-icon { transform: scale(1.15) translateX(4px); }

.product-hero-caption h3 { font-size: 17px; margin: 0 0 8px; }

.product-hero-caption p { margin: 0; font-size: 13px; opacity: 0.92; line-height: 1.55; }

.product-aside {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  padding: 32px 0 0;
  border-top: 1px solid var(--color-border);
}

.product-note {
  padding: 24px;
  border-radius: 12px;
  background: var(--color-bg-alt);
  border: 1px solid transparent;
  transition: all var(--transition);
}

.product-note:hover {
  border-color: var(--color-accent-light);
  box-shadow: 0 8px 32px rgba(37,99,235,0.1);
  transform: translateY(-2px);
}

.product-note-icon {
  width: 36px;
  height: 36px;
  color: var(--color-accent-light);
  margin-bottom: 12px;
  display: block;
  transition: transform var(--transition);
}

.product-note:hover .product-note-icon { transform: scale(1.1) rotate(5deg); }

.product-note h4 { font-size: 15px; margin: 0 0 10px; color: var(--color-deep); }

.product-note p { margin: 0; font-size: 14px; color: var(--color-text-muted); }

.section-design { background: var(--color-bg-alt); }

.design-editorial { max-width: 880px; }

.design-header { margin-bottom: 40px; }

.design-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 0 48px; }

.design-entry {
  padding: 24px;
  margin: 0 -24px;
  border-radius: 12px;
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition);
}

.design-entry:hover {
  background: rgba(37,99,235,0.04);
  border-radius: 12px;
  transform: translateX(8px);
}

.design-entry:last-child { border-bottom: none; }

.design-icon {
  width: 20px;
  height: 20px;
  color: var(--color-accent-light);
  margin-right: 10px;
  display: inline-block;
  vertical-align: middle;
  transition: transform var(--transition);
}

.design-entry:hover .design-icon { transform: scale(1.2); }

.design-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-accent-light);
  margin-right: 10px;
}

.design-entry h3 { display: inline; font-size: 15px; margin: 0 0 6px; }

.design-entry p { margin: 10px 0 0 30px; font-size: 14px; color: var(--color-text-muted); line-height: 1.6; }

.section-security { background: var(--color-bg); }

.security-spread {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto auto;
  gap: 24px;
}

.security-visual-a,
.security-visual-b {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 12px 40px rgba(0,0,0,0.1);
}

.security-visual-a { grid-column: 1; grid-row: 1 / 3; aspect-ratio: 3/4; }

.security-visual-b { grid-column: 2; grid-row: 1; aspect-ratio: 16/9; }

.security-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 44px;
  height: 44px;
  background: rgba(255,255,255,0.95);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent-light);
  z-index: 2;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  transition: transform var(--transition);
}

.security-visual-a:hover .security-badge,
.security-visual-b:hover .security-badge {
  transform: scale(1.1) rotate(5deg);
}

.security-visual-a img,
.security-visual-b img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s var(--ease);
}

.security-visual-a:hover img,
.security-visual-b:hover img { transform: scale(1.05); }

.security-text { grid-column: 2; grid-row: 2 / 4; padding: 24px 0 0; }

.security-doc h4 {
  font-size: 14px;
  margin: 24px 0 10px;
  color: var(--color-deep);
  display: flex;
  align-items: center;
  gap: 8px;
}

.security-doc h4:first-child { margin-top: 0; }

.security-doc-icon {
  width: 18px;
  height: 18px;
  color: var(--color-accent-light);
  flex-shrink: 0;
}

.security-doc p { margin: 0; font-size: 14px; color: var(--color-text-muted); line-height: 1.7; }

.section-scenarios { background: var(--color-bg-alt); }

.scenarios-narrative { display: flex; flex-direction: column; gap: 24px; }

.scenario-frame {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  aspect-ratio: 16/9;
  box-shadow: 0 12px 40px rgba(0,0,0,0.1);
}

.scenario-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s var(--ease);
}

.scenario-frame:hover img { transform: scale(1.05); }

.scenario-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 36px;
  background: linear-gradient(to top, rgba(10,22,40,0.95), transparent 70%);
  color: #fff;
  transition: padding var(--transition);
}

.scenario-frame:hover .scenario-overlay { padding-bottom: 40px; }

.scenario-overlay-icon {
  width: 32px;
  height: 32px;
  margin-bottom: 12px;
  display: block;
  opacity: 0.9;
  transition: transform var(--transition);
}

.scenario-frame:hover .scenario-overlay-icon { transform: scale(1.15); }

.scenario-overlay h3 { font-size: 20px; margin: 0 0 8px; }

.scenario-overlay p { margin: 0; font-size: 14px; opacity: 0.9; }

.scenario-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

.scenario-cell {
  padding: 28px 20px;
  background: var(--color-bg);
  border-radius: 12px;
  text-align: center;
  border: 2px solid transparent;
  transition: all var(--transition);
}

.scenario-cell:hover {
  border-color: var(--color-accent-light);
  background: var(--color-bg-alt);
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(37,99,235,0.15);
}

.scenario-cell-icon {
  width: 40px;
  height: 40px;
  margin: 0 auto 12px;
  display: block;
  color: var(--color-accent-light);
  transition: transform var(--transition);
}

.scenario-cell:hover .scenario-cell-icon {
  transform: scale(1.2) rotate(-5deg);
}

.scenario-cell-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-accent-light);
  margin-bottom: 8px;
}

.scenario-cell p { margin: 0; font-size: 13px; color: var(--color-text-muted); }

.section-showcase { background: var(--color-bg); }

.showcase-carousel {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
}

.showcase-slider {
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px 16px;
  position: relative;
  padding: 0 20px;
}

.showcase-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 56px;
  height: 56px;
  border: none;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-deep), var(--color-accent));
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(37,99,235,0.3);
  transition: all var(--transition);
  z-index: 10;
}

.showcase-arrow:hover {
  transform: translateY(-50%) scale(1.1);
  box-shadow: 0 12px 32px rgba(37,99,235,0.4);
}

.showcase-arrow:active {
  transform: translateY(-50%) scale(0.95);
}

.showcase-arrow-prev { left: 0; }
.showcase-arrow-next { right: 0; }

.showcase-arrow-icon {
  width: 28px;
  height: 28px;
  display: block;
}

.showcase-slider .showcase-phone {
  order: 0;
}

.showcase-slider .showcase-dots {
  order: 1;
  flex-basis: 100%;
}

.showcase-phone {
  position: relative;
  width: min(280px, 60%);
  aspect-ratio: 9/19;
  border-radius: 36px;
  background: linear-gradient(145deg, #0a1628, #152640);
  padding: 14px;
  box-shadow:
    0 25px 50px rgba(0,0,0,0.3),
    0 0 0 1px rgba(255,255,255,0.05),
    inset 0 1px 0 rgba(255,255,255,0.1);
  overflow: visible;
  transition: transform var(--transition);
}

.showcase-phone:hover {
  transform: scale(1.02);
}

.showcase-phone-glow {
  position: absolute;
  inset: -20px;
  border-radius: 50px;
  background: radial-gradient(ellipse at center, rgba(37,99,235,0.2) 0%, transparent 70%);
  z-index: -1;
  opacity: 0;
  transition: opacity var(--transition);
}

.showcase-phone:hover .showcase-phone-glow { opacity: 1; }

.showcase-track {
  width: 100%;
  height: 100%;
  border-radius: 24px;
  overflow-x: auto;
  overflow-y: hidden;
  display: flex;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.2);
}

.showcase-track img {
  flex: 0 0 100%;
  width: 100%;
  height: 100%;
  object-fit: cover;
  scroll-snap-align: start;
  display: block;
}

.showcase-dots {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

.showcase-dots .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-border);
  cursor: pointer;
  transition: all var(--transition);
}

.showcase-dots .dot:hover {
  background: var(--color-accent-light);
  transform: scale(1.3);
}

.showcase-dots .dot.active {
  background: var(--color-accent-light);
  transform: scale(1.3);
  box-shadow: 0 0 12px var(--color-accent-glow);
}

.section-faq { background: var(--color-bg-alt); }

.faq-editorial { max-width: 100%; width: 100%; }

.faq-header { margin-bottom: 36px; }

.faq-glossary { display: flex; flex-direction: column; gap: 4px; }

.faq-term {
  border: none;
  border-radius: 12px;
  padding: 0;
  background: var(--color-bg);
  transition: all var(--transition);
}

.faq-term:hover { background: rgba(37,99,235,0.04); }

.faq-term[open] {
  background: rgba(37,99,235,0.06);
  box-shadow: 0 4px 20px rgba(37,99,235,0.08);
}

.faq-term summary {
  padding: 20px 24px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  transition: color var(--transition);
}

.faq-term summary::-webkit-details-marker { display: none; }

.faq-term summary::after {
  content: "+";
  margin-left: auto;
  font-size: 20px;
  font-weight: 300;
  color: var(--color-muted);
  flex-shrink: 0;
  transition: transform var(--transition);
}

.faq-term[open] summary::after {
  content: "−";
  transform: rotate(180deg);
}

.faq-term-icon {
  width: 20px;
  height: 20px;
  color: var(--color-accent-light);
  flex-shrink: 0;
  margin-top: 2px;
}

.faq-term-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-accent-light);
  flex-shrink: 0;
}

.faq-term-body {
  padding: 0 24px 24px 56px;
  animation: faqExpand 0.3s var(--ease);
}

@keyframes faqExpand {
  from { opacity: 0; }
  to { opacity: 1; }
}

.faq-term-body p { margin: 0; font-size: 14px; color: var(--color-text-muted); line-height: 1.7; }

.section-contact { background: var(--color-deep); color: #fff; }

.contact-colophon .section-num { color: rgba(255, 255, 255, 0.6); }

.contact-colophon .section-title { color: #fff; }

.contact-body {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 48px;
  align-items: start;
  margin-top: 32px;
}

.contact-main h3 { font-size: 14px; margin: 24px 0 8px; color: rgba(255, 255, 255, 0.9); }

.contact-main h3:first-child { margin-top: 0; }

.contact-main p { margin: 0; font-size: 14px; color: rgba(255, 255, 255, 0.75); line-height: 1.7; }

.contact-details { margin-top: 24px; }

.contact-details p {
  margin: 0 0 12px;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: transform var(--transition);
}

.contact-details p:hover { transform: translateX(4px); }

.contact-icon {
  width: 18px;
  height: 18px;
  color: var(--color-accent-light);
  flex-shrink: 0;
  opacity: 0.9;
}

.contact-logo-wrap {
  width: 72px;
  height: 72px;
  padding: 12px;
  background: rgba(255,255,255,0.08);
  border-radius: 16px;
  margin-bottom: 16px;
  transition: all var(--transition);
}

.contact-logo-wrap:hover {
  background: rgba(255,255,255,0.12);
  transform: scale(1.05);
}

.contact-side img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.contact-side p { font-size: 12px; opacity: 0.7; margin: 0; }

.site-footer {
  background: #061018;
  color: rgba(255, 255, 255, 0.7);
  padding: 48px var(--section-pad) 36px;
}

.footer-colophon { max-width: 720px; margin: 0 auto; text-align: left; }

.footer-identity {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  transition: transform var(--transition);
}

.footer-identity:hover { transform: translateX(4px); }

.footer-identity img {
  width: 28px;
  height: 28px;
  object-fit: contain;
  border-radius: 6px;
}

.footer-identity span { font-size: 16px; font-weight: 600; color: #fff; }

.footer-statement { font-size: 13px; line-height: 1.7; margin: 0 0 8px; }

.footer-statement-en { font-size: 12px; opacity: 0.8; margin: 0 0 24px; }

.footer-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
  font-size: 13px;
  margin-bottom: 24px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: all var(--transition);
  position: relative;
}

.footer-links a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-accent-light);
  transition: width var(--transition);
}

.footer-links a:hover {
  color: #fff;
}

.footer-links a:hover::after { width: 100%; }

.footer-sep { opacity: 0.4; margin: 0 4px; }

.footer-copy { font-size: 11px; opacity: 0.5; margin: 0; }

.section-header,
.brand-spread,
.product-hero,
.product-aside,
.design-editorial,
.security-spread,
.scenarios-narrative,
.showcase-carousel,
.faq-editorial,
.contact-colophon {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

.section-header.visible,
.brand-spread.visible,
.product-hero.visible,
.product-aside.visible,
.design-editorial.visible,
.security-spread.visible,
.scenarios-narrative.visible,
.showcase-carousel.visible,
.faq-editorial.visible,
.contact-colophon.visible {
  opacity: 1;
  transform: translateY(0);
}

.product-hero-a { transition-delay: 0.05s; }
.product-hero-b { transition-delay: 0.1s; }
.product-aside { transition-delay: 0.15s; }

.design-entry {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out), all var(--transition);
}

.design-entry.visible {
  opacity: 1;
  transform: translateY(0);
}

.design-entry:nth-child(1) { transition-delay: 0.05s; }
.design-entry:nth-child(2) { transition-delay: 0.1s; }
.design-entry:nth-child(3) { transition-delay: 0.15s; }
.design-entry:nth-child(4) { transition-delay: 0.2s; }
.design-entry:nth-child(5) { transition-delay: 0.25s; }

.scenario-cell {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out), all var(--transition);
}

.scenario-cell.visible {
  opacity: 1;
  transform: translateY(0);
}

.scenario-cell:nth-child(1) { transition-delay: 0.05s; }
.scenario-cell:nth-child(2) { transition-delay: 0.1s; }
.scenario-cell:nth-child(3) { transition-delay: 0.15s; }
.scenario-cell:nth-child(4) { transition-delay: 0.2s; }

@media (max-width: 1024px) {
  :root { --nav-width: 0; }

  .nav-side {
    transform: translateX(-100%);
    width: 280px;
  }

  .nav-link { padding: 12px 16px; }

  .mobile-header {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .main-content {
    margin-left: 0;
    padding-top: 56px;
  }

  .cover-grid { animation: none; }

  .cover-glow { display: none; }

  .brand-spread { grid-template-columns: 1fr; }

  .brand-visual-block { aspect-ratio: 16/10; }

  .product-map { grid-template-columns: 1fr; }

  .product-hero-a, .product-hero-b { grid-column: 1; }

  .product-aside { grid-template-columns: 1fr; }

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

  .security-spread { grid-template-columns: 1fr; grid-template-rows: auto; }

  .security-visual-a { grid-column: 1; grid-row: 1; aspect-ratio: 16/10; }

  .security-visual-b { grid-column: 1; grid-row: 2; }

  .security-text { grid-column: 1; grid-row: 3; }

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

  .showcase-phone { width: 220px; }

  .showcase-arrow {
    width: 48px;
    height: 48px;
  }

  .showcase-arrow-icon { width: 24px; height: 24px; }

  .showcase-arrow-prev { left: 8px; }
  .showcase-arrow-next { right: 8px; }

  .contact-body { grid-template-columns: 1fr; }

  .contact-side { text-align: left; }

  .section-icon { display: none; }
}

@media (max-width: 640px) {
  .section { padding: 32px 20px; }

  .cover-desc { font-size: 13px; }

  .section-header { margin-bottom: 28px; }

  .product-hero { min-height: 220px; }

  .scenario-strip { grid-template-columns: 1fr; }

  .showcase-phone { width: 180px; }

  .showcase-arrow {
    width: 44px;
    height: 44px;
  }

  .showcase-arrow-prev { left: 4px; }
  .showcase-arrow-next { right: 4px; }

  .footer-links { flex-direction: column; align-items: flex-start; }
}