@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;700&family=Noto+Serif+SC:wght@600;700&family=Sora:wght@500;600;700&display=swap');

:root {
  --ink: #0a1628;
  --ink-soft: #1a2d4a;
  --navy: #123055;
  --accent: #2b7de9;
  --accent-hover: #1f6ad0;
  --mist: #e8eef6;
  --paper: #f3f6fb;
  --white: #ffffff;
  --muted: #5a6f89;
  --line: rgba(18, 48, 85, 0.12);
  --dda: #d9772f;
  --dda-bg: #fff8f1;
  --qh: #3d8bfd;
  --qh-gold: #c9a227;
  --dida: #2ec4a0;
  --dida-bg: #071018;
  --radius: 14px;
  --shadow: 0 18px 48px rgba(10, 22, 40, 0.12);
  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-en: "Sora", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

.container {
  width: 92%;
  max-width: 1120px;
  margin: 0 auto;
}

/* Header */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  background: rgba(243, 246, 251, 0.88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease, background 0.25s ease;
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(255, 255, 255, 0.92);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 12px 0;
}

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

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: #f8fafc;
  border-radius: 10px;
  border: 1px solid var(--line);
  flex-shrink: 0;
}

.brand-mark svg {
  width: 28px;
  height: auto;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-name {
  font-family: var(--font-en);
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.02em;
}

.brand-sub {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.15em;
}

.nav {
  display: flex;
  gap: 28px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-soft);
  transition: color 0.2s ease;
}

.nav a:hover,
.nav a.active {
  color: var(--accent);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: var(--white);
  box-shadow: 0 10px 28px rgba(43, 125, 233, 0.28);
}

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

.btn-ghost {
  background: transparent;
  color: var(--white);
  border: 1.5px solid rgba(255, 255, 255, 0.55);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
}

.btn-dark {
  background: var(--ink);
  color: var(--white);
}

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

.btn-qh {
  background: linear-gradient(135deg, #1565c0, #3d8bfd);
  color: var(--white);
}

.btn-dida {
  background: linear-gradient(135deg, #1aa884, #2ec4a0);
  color: var(--white);
}

.btn-outline-dark {
  background: transparent;
  border: 1.5px solid var(--ink);
  color: var(--ink);
}

/* Home hero — one composition */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 140px 0 72px;
  overflow: hidden;
  color: var(--white);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 70% 30%, rgba(43, 125, 233, 0.35) 0%, transparent 55%),
    radial-gradient(ellipse 50% 40% at 15% 80%, rgba(46, 196, 160, 0.12) 0%, transparent 50%),
    linear-gradient(145deg, #06101f 0%, #0f2748 48%, #123055 100%);
}

.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  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: 56px 56px;
  mask-image: radial-gradient(ellipse at center, black 20%, transparent 75%);
  opacity: 0.7;
}

.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
}

.hero-inner {
  max-width: 560px;
}

.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-carousel {
  position: relative;
  width: 100%;
  max-width: 420px;
  height: 520px;
}

.hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.8s ease;
  pointer-events: none;
}

.hero-slide.active {
  opacity: 1;
  pointer-events: auto;
  position: relative;
  height: 100%;
}

.hero-card {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 22px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow:
    0 32px 64px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(255, 255, 255, 0.04) inset;
  background: #0a1628;
  animation: floatY 8s ease-in-out infinite;
}

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

.hero-card-glow {
  position: absolute;
  inset: -40px;
  border-radius: 32px;
  background: radial-gradient(ellipse at 50% 50%, rgba(43, 125, 233, 0.35) 0%, transparent 60%);
  z-index: -1;
  filter: blur(30px);
}

.hero-dots {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 24px;
}

.hero-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.35);
  background: transparent;
  cursor: pointer;
  padding: 0;
  transition: all 0.3s ease;
}

.hero-dot.active {
  background: #fff;
  border-color: #fff;
  transform: scale(1.3);
}

.hero-brand {
  font-family: var(--font-en);
  font-size: clamp(42px, 7vw, 72px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: 10px;
}

.hero-brand span {
  display: block;
  font-family: var(--font-display);
  font-size: 0.42em;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: rgba(255, 255, 255, 0.72);
  margin-top: 8px;
}

.hero-line {
  font-family: var(--font-display);
  font-size: clamp(22px, 3.2vw, 32px);
  font-weight: 600;
  margin: 28px 0 14px;
  letter-spacing: 0.04em;
}

.hero-desc {
  font-size: 16px;
  color: rgba(232, 238, 246, 0.82);
  max-width: 480px;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@keyframes floatY {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero-inner {
  animation: fadeUp 0.9s ease both;
}

/* Sections */
.section {
  padding: 96px 0;
}

.section-head {
  text-align: center;
  margin-bottom: 52px;
}

.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 40px);
  color: var(--ink);
  margin-bottom: 12px;
}

.section-head p {
  color: var(--muted);
  font-size: 16px;
  max-width: 560px;
  margin: 0 auto;
}

/* About */
.about {
  background: var(--white);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: center;
}

.about-text {
  color: var(--ink-soft);
}

.about-title {
  font-family: var(--font-display);
  font-size: 34px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.3;
  margin-bottom: 20px;
}

.about-lead {
  font-size: 16px;
  line-height: 1.7;
  color: #3d5170;
  margin-bottom: 28px;
}

.about-features {
  list-style: none;
  padding: 0;
  margin: 0 0 32px;
}

.about-features li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 16px;
  margin-bottom: 10px;
  background: var(--paper);
  border-radius: 12px;
  border: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.5;
}

.about-features li strong {
  display: block;
  color: var(--ink);
  font-size: 15px;
  margin-bottom: 2px;
}

.about-feature-icon {
  font-size: 22px;
  line-height: 1;
  flex-shrink: 0;
  margin-top: 2px;
}

.about-stats {
  display: flex;
  gap: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.about-stat strong {
  display: block;
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 6px;
}

.about-stat span {
  font-size: 13px;
  color: var(--muted);
}

.about-panel {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  min-height: 320px;
  background: linear-gradient(160deg, #0f2748 0%, #06101f 100%);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px;
  color: var(--white);
}

.about-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  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: 40px 40px;
  mask-image: radial-gradient(ellipse at center, black 25%, transparent 70%);
}

.about-panel-inner {
  position: relative;
  z-index: 2;
  text-align: center;
  width: 100%;
}

.about-panel-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 28px;
}

.about-panel-logo svg {
  width: 36px;
  height: auto;
  color: #fff;
}

.about-panel-logo span {
  font-family: var(--font-en);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.about-products-row {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
}

.about-product-tag {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 10px;
  text-align: left;
  white-space: nowrap;
}

.about-product-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}

.about-product-name {
  font-size: 13px;
  font-weight: 500;
  flex-shrink: 0;
}

.about-product-desc {
  font-size: 11px;
  opacity: 0.5;
  margin-left: auto;
}

.about-panel-footer {
  font-size: 13px;
  opacity: 0.5;
}

/* Products on home */
.products {
  background: var(--paper);
}

.product-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  margin-bottom: 72px;
  padding: 36px;
  border-radius: 20px;
  background: var(--white);
  box-shadow: 0 8px 32px rgba(10, 22, 40, 0.06);
  border: 1px solid var(--line);
}

.product-block:last-child {
  margin-bottom: 0;
}

.product-block.reverse .product-media {
  order: 2;
}

.product-block.reverse .product-copy {
  order: 1;
}

.product-media {
  border-radius: 16px;
  overflow: hidden;
  background: #0a1628;
  min-height: 340px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.product-media img {
  width: 100%;
  height: 100%;
  max-height: 420px;
  object-fit: contain;
  transition: transform 0.5s ease;
}

.product-block:hover .product-media img {
  transform: scale(1.03);
}

.product-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 14px;
}

.tag-dda {
  background: #fff0e4;
  color: var(--dda);
}

.tag-qh {
  background: #e8f1ff;
  color: #1565c0;
}

.tag-dida {
  background: #e6faf4;
  color: #148a6e;
}

.product-copy h3 {
  font-family: var(--font-display);
  font-size: 28px;
  margin-bottom: 8px;
}

.product-copy .sub {
  font-size: 15px;
  color: var(--accent);
  margin-bottom: 14px;
  font-weight: 500;
}

.product-copy p {
  color: var(--muted);
  margin-bottom: 18px;
}

.product-copy ul {
  margin-bottom: 24px;
}

.product-copy li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 8px;
  color: var(--ink-soft);
  font-size: 15px;
}

.product-copy li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

.product-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* Contact */
.contact {
  background: var(--white);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.contact-info h3,
.contact-form h3 {
  font-family: var(--font-display);
  font-size: 24px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--ink);
  display: inline-block;
}

.contact-info p {
  color: var(--muted);
  margin-bottom: 20px;
}

.contact-info li {
  margin-bottom: 10px;
  color: var(--ink-soft);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 14px 16px;
  margin-bottom: 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-family: var(--font-body);
  font-size: 15px;
  background: var(--paper);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(43, 125, 233, 0.15);
}

.contact-form textarea {
  min-height: 140px;
  resize: vertical;
}

.contact-form .btn {
  width: 100%;
}

/* Footer */
.site-footer {
  background: var(--ink);
  color: rgba(255, 255, 255, 0.78);
  padding: 64px 0 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-brand-link {
  color: var(--white);
}

.footer-brand-link .brand-mark {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.12);
  width: 44px;
  height: 44px;
}

.footer-brand-link .brand-mark svg {
  width: 30px;
  color: #fff;
}

.footer-brand-link .brand-name {
  color: #fff;
  font-size: 18px;
}

.footer-brand-link .brand-sub {
  color: rgba(255, 255, 255, 0.6);
}

.footer-desc {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.6);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.55);
}

.footer-col h4 {
  color: #fff;
  margin-bottom: 18px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  color: rgba(255, 255, 255, 0.55);
  font-size: 14px;
  transition: color 0.2s ease, padding-left 0.2s ease;
  position: relative;
}

.footer-col a:hover {
  color: #fff;
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 20px;
  text-align: center;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.4);
}

/* ========== Product detail shared ========== */
.page-hero {
  position: relative;
  margin-top: 76px;
  min-height: 68vh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  color: var(--white);
}

.page-hero-bg {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.page-hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.page-hero-mask {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(6, 16, 31, 0.25) 0%,
    rgba(6, 16, 31, 0.72) 55%,
    rgba(6, 16, 31, 0.94) 100%
  );
}

.page-hero-inner {
  position: relative;
  z-index: 2;
  padding: 48px 0;
  max-width: 720px;
  animation: fadeUp 0.8s ease both;
}

.page-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 48px);
  margin-bottom: 10px;
}

.page-hero .tagline {
  font-size: 18px;
  opacity: 0.9;
  margin-bottom: 14px;
}

.page-hero .lede {
  font-size: 15px;
  opacity: 0.78;
  max-width: 560px;
  margin-bottom: 24px;
}

.badge {
  display: inline-block;
  margin-top: 16px;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.intro-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.intro-grid h2 {
  font-family: var(--font-display);
  font-size: 30px;
  margin-bottom: 16px;
}

.intro-grid p {
  color: var(--muted);
  margin-bottom: 14px;
}

.check-list li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 8px;
  color: var(--ink-soft);
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

.intro-visual {
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow);
  background: var(--paper);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 280px;
}

.intro-visual img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  max-height: 380px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.feature-card .icon {
  font-size: 26px;
  margin-bottom: 12px;
  display: block;
}

.feature-card h3 {
  font-size: 18px;
  margin-bottom: 8px;
  color: var(--ink);
}

.feature-card p {
  font-size: 14px;
  color: var(--muted);
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
}

.step {
  text-align: center;
  padding: 22px 14px;
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.step-num {
  display: inline-flex;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--ink);
  color: var(--white);
  font-weight: 700;
  margin-bottom: 12px;
}

.step h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.step p {
  font-size: 13px;
  color: var(--muted);
}

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

.gallery figure {
  border-radius: 12px;
  overflow: hidden;
  background: #0a1628;
  display: flex;
  flex-direction: column;
}

.gallery img {
  width: 100%;
  height: 220px;
  object-fit: contain;
  background: #0a1628;
}

.gallery figcaption {
  padding: 12px 14px;
  font-size: 13px;
  background: var(--white);
  color: var(--ink-soft);
}

.faq-list .faq-item {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
  margin-bottom: 12px;
}

.faq-item h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.faq-item p {
  font-size: 14px;
  color: var(--muted);
}

.cta-band {
  text-align: center;
  padding: 72px 0;
  background: var(--ink);
  color: var(--white);
}

.cta-band h2 {
  font-family: var(--font-display);
  font-size: 28px;
  margin-bottom: 10px;
}

.cta-band p {
  opacity: 0.75;
  margin-bottom: 24px;
}

.sys-table {
  max-width: 640px;
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: var(--white);
}

.sys-row {
  display: flex;
  border-bottom: 1px solid var(--line);
}

.sys-row:last-child {
  border-bottom: none;
}

.sys-label {
  flex: 0 0 140px;
  padding: 14px 18px;
  background: var(--mist);
  font-weight: 500;
  color: var(--navy);
}

.sys-value {
  flex: 1;
  padding: 14px 18px;
  color: var(--muted);
}

/* Product-specific page themes */
.page-dda .page-hero-mask {
  background: linear-gradient(180deg, rgba(80, 45, 20, 0.2), rgba(40, 22, 10, 0.88));
}

.page-dda .section-soft {
  background: var(--dda-bg);
}

.page-dda .check-list li::before,
.page-dda .nav a.active {
  color: var(--dda);
}

.page-qh {
  background: #0a1628;
  color: #e8f0ff;
}

.page-qh .site-header {
  background: rgba(10, 22, 40, 0.9);
  border-bottom-color: rgba(255, 255, 255, 0.06);
}

.page-qh .brand-mark {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.12);
}

.page-qh .brand-name { color: #fff; }
.page-qh .brand-sub { color: #8aacc8; }

.page-qh .nav a {
  color: rgba(232, 240, 255, 0.8);
}

.page-qh .nav a:hover,
.page-qh .nav a.active {
  color: var(--qh);
}

.page-qh .section-soft,
.page-qh .section-alt {
  background: #0f1f38;
}

.page-qh .section-head h2,
.page-qh .intro-grid h2,
.page-qh .feature-card h3,
.page-qh .faq-item h3 {
  color: #fff;
}

.page-qh .section-head p,
.page-qh .intro-grid p,
.page-qh .feature-card p,
.page-qh .faq-item p,
.page-qh .step p {
  color: #8aacc8;
}

.page-qh .feature-card,
.page-qh .step,
.page-qh .faq-item,
.page-qh .sys-table {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(77, 163, 255, 0.15);
}

.page-qh .sys-label {
  background: rgba(77, 163, 255, 0.1);
  color: var(--qh);
}

.page-qh .sys-value {
  color: #a0b8d8;
}

.page-qh .check-list li {
  color: #c0d4ec;
}

.page-qh .check-list li::before {
  color: var(--qh);
}

.page-dida {
  background: var(--dida-bg);
  color: #e8fff8;
}

.page-dida .site-header {
  background: rgba(7, 16, 24, 0.92);
  border-bottom-color: rgba(46, 196, 160, 0.12);
}

.page-dida .brand-mark {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(46, 196, 160, 0.15);
}

.page-dida .brand-name { color: #fff; }
.page-dida .brand-sub { color: #8ab0a4; }

.page-dida .nav a {
  color: rgba(232, 255, 248, 0.8);
}

.page-dida .nav a:hover,
.page-dida .nav a.active {
  color: var(--dida);
}

.page-dida .section-soft,
.page-dida .section-alt {
  background: #0c1a24;
}

.page-dida .section-head h2,
.page-dida .intro-grid h2,
.page-dida .feature-card h3,
.page-dida .faq-item h3 {
  color: #fff;
}

.page-dida .section-head p,
.page-dida .intro-grid p,
.page-dida .feature-card p,
.page-dida .faq-item p,
.page-dida .step p {
  color: #8ab0a4;
}

.page-dida .feature-card,
.page-dida .step,
.page-dida .faq-item,
.page-dida .sys-table {
  background: rgba(46, 196, 160, 0.06);
  border-color: rgba(46, 196, 160, 0.18);
}

.page-dida .sys-label {
  background: rgba(46, 196, 160, 0.12);
  color: var(--dida);
}

.page-dida .sys-value {
  color: #9bc4b8;
}

.page-dida .check-list li {
  color: #c5e8dc;
}

.page-dida .check-list li::before {
  color: var(--dida);
}

.page-dida .page-hero-mask {
  background: linear-gradient(180deg, rgba(7, 16, 24, 0.35), rgba(7, 16, 24, 0.92));
}

.wide-visual {
  margin-top: 36px;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.wide-visual img {
  width: 100%;
}

/* Responsive */
@media (max-width: 900px) {
  .about-grid,
  .product-block,
  .product-block.reverse,
  .contact-grid,
  .intro-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .hero-inner {
    max-width: 100%;
    margin: 0 auto;
  }

  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-visual {
    order: -1;
  }

  .hero-carousel {
    max-width: 280px;
    height: 360px;
    margin: 0 auto;
  }

  .hero-card {
    max-width: 280px;
    margin: 0 auto;
  }

  .hero-dots {
    margin-top: 16px;
  }

  .product-block.reverse .product-media,
  .product-block.reverse .product-copy {
    order: initial;
  }

  .nav {
    gap: 14px;
  }

  .nav a {
    font-size: 13px;
  }
}

@media (max-width: 640px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .brand-mark {
    width: 34px;
    height: 34px;
  }

  .brand-mark svg {
    width: 24px;
  }

  .brand-name {
    font-size: 16px;
  }

  .brand-sub {
    font-size: 10px;
  }

  .hero {
    min-height: auto;
    padding: 120px 0 56px;
  }

  .page-hero {
    min-height: 52vh;
  }

  .product-block {
    padding: 20px;
  }

  .sys-row {
    flex-direction: column;
  }

  .sys-label {
    flex: none;
  }
}