:root {
  --c-red: #E63946;
  --c-deep-blue: #0A1F3C;
  --c-neon-green: #39FF14;
  --c-dark-red: #9B1B2D;
  --c-steel-blue: #2A4E6E;
  --c-off-white: #F5F7FA;
  --c-light-gray: #DCE3EA;
  --c-text-dark: #1A1A1A;
  --c-text-light: #FFFFFF;
  --font-head: "Archivo Black", "Arial Black", "DIN Alternate", "Noto Sans SC", var(--font-body);
  --font-body: "Inter", "Roboto", "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --container-w: 1200px;
  --radius: 0;
  --clip-panel: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
  --transition: 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  --font-size-body: 16px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--font-size-body);
  line-height: 1.6;
  color: var(--c-text-dark);
  background-color: var(--c-off-white);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition), background-color var(--transition), border-color var(--transition);
}

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: transparent;
  color: inherit;
}

.container {
  width: min(100% - 48px, var(--container-w));
  margin-inline: auto;
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0 0 0 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

:focus-visible {
  outline: 3px solid var(--c-neon-green);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: fixed;
  top: -200px;
  left: 16px;
  z-index: 9999;
  padding: 12px 24px;
  background: var(--c-deep-blue);
  color: var(--c-text-light);
  font-weight: 700;
  border: 2px solid var(--c-neon-green);
  transition: top 0.25s ease;
}

.skip-link:focus {
  top: 12px;
  outline: none;
}

/* ---------- Scroll Progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 100%;
  pointer-events: none;
  z-index: 1000;
}

.scroll-progress__bar {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--c-red), var(--c-neon-green));
  transform-origin: left;
}

/* ---------- Site Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 900;
  background: var(--c-deep-blue);
  color: var(--c-text-light);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.site-header__signal {
  height: 4px;
  background: linear-gradient(90deg, var(--c-red) 0%, var(--c-red) 20%, transparent 20%, transparent 24%, var(--c-neon-green) 24%, var(--c-neon-green) 28%, transparent 28%, transparent 70%, var(--c-dark-red) 70%, var(--c-red) 100%);
  opacity: 0.85;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 0;
}

.brand-lockup {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.15;
}

.brand-lockup__name {
  font-family: var(--font-head);
  font-size: clamp(1.25rem, 2.2vw, 1.7rem);
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--c-text-light);
}

.brand-lockup__name-en {
  font-size: 0.42em;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--c-neon-green);
  display: block;
  margin-top: 2px;
}

.brand-lockup__sub {
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  color: rgba(255, 255, 255, 0.7);
  font-weight: 500;
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 18px;
}

.header-fav-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--c-red);
  color: var(--c-text-light);
  font-weight: 700;
  font-size: 0.92rem;
  padding: 12px 18px;
  border-radius: 4px 14px 4px 14px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 0 0 0 rgba(230, 57, 70, 0);
  transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition);
}

.header-fav-btn:hover,
.header-fav-btn:focus-visible {
  background: var(--c-dark-red);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(230, 57, 70, 0.45);
  color: var(--c-text-light);
}

.header-fav-btn__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-neon-green);
  box-shadow: 0 0 8px var(--c-neon-green);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 6px;
  transition: border-color var(--transition);
}

.nav-toggle:hover,
.nav-toggle[aria-expanded="true"] {
  border-color: var(--c-neon-green);
}

.nav-toggle__bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--c-text-light);
  margin: 0 auto;
  border-radius: 2px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar {
  background: var(--c-neon-green);
}

.site-nav {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(6, 16, 32, 0.96);
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
}

.nav-list__item {
  margin: 0;
}

.nav-link {
  display: block;
  padding: 14px 22px;
  color: rgba(255, 255, 255, 0.84);
  font-weight: 600;
  font-size: 0.98rem;
  letter-spacing: 0.03em;
  border-bottom: 3px solid transparent;
  transition: color var(--transition), border-color var(--transition), background-color var(--transition);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--c-neon-green);
  background-color: rgba(57, 255, 20, 0.06);
}

.nav-link[aria-current="page"] {
  color: var(--c-text-light);
  border-bottom-color: var(--c-red);
  box-shadow: inset 0 2px 0 var(--c-red);
}

/* ---------- Main Layout ---------- */
#main-content {
  flex: 1;
  width: 100%;
}

::selection {
  background: var(--c-red);
  color: var(--c-text-light);
}

/* ---------- Section Building Blocks ---------- */
.section {
  padding: clamp(56px, 8vh, 96px) 0;
  position: relative;
}

.section-kicker {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-steel-blue);
  margin-bottom: 10px;
}

.section-title {
  font-family: var(--font-head);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  color: var(--c-text-dark);
}

.section-lead {
  font-size: 1.08rem;
  color: var(--c-text-dark);
  max-width: 68ch;
  opacity: 0.86;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1.2;
  border: 2px solid transparent;
  border-radius: 4px 16px 4px 16px;
  transition: transform var(--transition), background-color var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.btn--primary {
  background: var(--c-red);
  color: var(--c-text-light);
  border-color: var(--c-red);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--c-dark-red);
  border-color: var(--c-dark-red);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(230, 57, 70, 0.35);
  color: var(--c-text-light);
}

.btn--ghost {
  background: transparent;
  color: var(--c-deep-blue);
  border-color: var(--c-steel-blue);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--c-red);
  color: var(--c-red);
  transform: translateY(-2px);
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  padding: 18px 0;
  font-size: 0.88rem;
  color: var(--c-steel-blue);
  border-bottom: 1px solid var(--c-light-gray);
  margin-bottom: 32px;
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb__list li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb__list li + li::before {
  content: "/";
  color: var(--c-steel-blue);
  opacity: 0.6;
}

.breadcrumb__link {
  color: var(--c-steel-blue);
  font-weight: 500;
}

.breadcrumb__link:hover {
  color: var(--c-red);
}

.breadcrumb__current {
  color: var(--c-text-dark);
  font-weight: 700;
}

/* ---------- Grids ---------- */
.grid--2col,
.grid--3col {
  display: grid;
  gap: 28px;
  margin-top: 36px;
}

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

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

/* ---------- Panels ---------- */
.panel {
  background: var(--c-text-light);
  border: 1px solid var(--c-light-gray);
  padding: 32px;
  clip-path: var(--clip-panel);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.panel:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(10, 31, 60, 0.12);
  border-color: var(--c-steel-blue);
}

.panel__title {
  font-family: var(--font-head);
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--c-deep-blue);
}

.panel__text {
  font-size: 0.94rem;
  color: rgba(26, 26, 26, 0.75);
  line-height: 1.7;
}

/* ---------- Data & Status ---------- */
.data-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  background: var(--c-deep-blue);
  color: var(--c-neon-green);
  font-family: var(--font-head);
  font-size: 0.85rem;
  font-weight: 700;
  border-radius: 2px 8px 2px 8px;
}

.data-chip::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-neon-green);
  box-shadow: 0 0 6px var(--c-neon-green);
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-neon-green);
  box-shadow: 0 0 6px var(--c-neon-green);
  margin-right: 6px;
}

/* ---------- Image Placeholder Base ---------- */
.img-frame {
  position: relative;
  background: linear-gradient(135deg, var(--c-deep-blue), var(--c-steel-blue));
  overflow: hidden;
}

.img-frame::before {
  content: "";
  display: block;
  padding-top: 62.5%;
}

.img-frame::after {
  content: "动态影像";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-head);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: rgba(255, 255, 255, 0.6);
  background: repeating-linear-gradient(-45deg, rgba(230, 57, 70, 0.25) 0 12px, transparent 12px 24px);
}

.img-frame--tall::before {
  padding-top: 120%;
}

.img-frame--wide::before {
  padding-top: 42%;
}

/* ---------- Split Hero Placeholder ---------- */
.hero-split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 32px;
  align-items: center;
  min-height: 520px;
}

/* ---------- Accordion / Disclosure ---------- */
.faq-item {
  background: var(--c-text-light);
  border: 1px solid var(--c-light-gray);
  margin-bottom: 14px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.faq-item[data-open] {
  border-color: var(--c-steel-blue);
  box-shadow: 0 8px 24px rgba(10, 31, 60, 0.08);
}

.faq-item__summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  font-family: var(--font-head);
  font-weight: 700;
  color: var(--c-deep-blue);
  cursor: pointer;
  border: none;
  background: transparent;
  text-align: left;
  width: 100%;
}

.faq-item__icon {
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  position: relative;
  background: var(--c-deep-blue);
  border-radius: 4px;
}

.faq-item__icon::before,
.faq-item__icon::after {
  content: "";
  position: absolute;
  background: var(--c-neon-green);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.faq-item__icon::before {
  width: 12px;
  height: 2px;
}

.faq-item__icon::after {
  width: 2px;
  height: 12px;
}

.faq-item[data-open] .faq-item__icon::after {
  height: 0;
}

.faq-item__content {
  display: none;
  padding: 0 24px 24px;
  color: rgba(26, 26, 26, 0.78);
  border-top: 1px solid var(--c-light-gray);
  padding-top: 18px;
  font-size: 0.95rem;
}

.faq-item[data-open] .faq-item__content {
  display: block;
}

/* ---------- Tabs ---------- */
.tabs {
  margin-top: 28px;
}

.tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  border-bottom: 2px solid var(--c-light-gray);
  margin-bottom: 24px;
}

.tabs__button {
  padding: 12px 20px;
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--c-steel-blue);
  background: transparent;
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: 6px 6px 0 0;
  transition: color var(--transition), border-color var(--transition), background-color var(--transition);
}

.tabs__button[aria-selected="true"] {
  color: var(--c-deep-blue);
  background: var(--c-text-light);
  border-color: var(--c-light-gray);
  box-shadow: inset 0 -3px 0 var(--c-red);
}

.tabs__button:hover,
.tabs__button:focus-visible {
  color: var(--c-red);
}

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  background: var(--c-deep-blue);
  color: rgba(255, 255, 255, 0.76);
  margin-top: auto;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.site-footer__stripe {
  height: 5px;
  background: linear-gradient(110deg, var(--c-red) 0%, var(--c-red) 15%, transparent 15%, transparent 22%, var(--c-dark-red) 22%, var(--c-dark-red) 32%, transparent 32%, transparent 45%, var(--c-steel-blue) 45%, var(--c-steel-blue) 60%, transparent 60%, transparent 72%, var(--c-neon-green) 72%, var(--c-neon-green) 78%, transparent 78%, transparent 100%);
  opacity: 0.7;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 1.1fr 0.7fr;
  gap: 40px;
  padding: 56px 0 40px;
}

.footer-brand__logo {
  font-family: var(--font-head);
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--c-text-light);
  line-height: 1.2;
  margin-bottom: 14px;
}

.footer-brand__logo-en {
  display: block;
  font-size: 0.45em;
  letter-spacing: 0.18em;
  color: var(--c-neon-green);
  font-weight: 700;
  margin-top: 4px;
}

.footer-brand__desc,
.footer-brand__trust {
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.62);
  max-width: 38ch;
  margin-bottom: 12px;
}

.footer-brand__trust {
  color: var(--c-neon-green);
  font-weight: 500;
  opacity: 0.85;
}

.footer-col__title {
  font-family: var(--font-head);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--c-text-light);
  margin-bottom: 18px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--c-red);
  display: inline-block;
}

.footer-meta li {
  margin-bottom: 10px;
  font-size: 0.88rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.68);
}

.footer-links li {
  margin-bottom: 4px;
}

.footer-link {
  display: inline-block;
  color: rgba(255, 255, 255, 0.68);
  font-size: 0.9rem;
  padding: 3px 0;
  border-bottom: 1px solid transparent;
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--c-neon-green);
  border-bottom-color: var(--c-neon-green);
}

.footer-statement {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 20px 0 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.5);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .hero-split {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .site-header__inner {
    padding: 14px 0;
  }

  .header-tools {
    gap: 12px;
  }

  .header-fav-btn {
    padding: 10px 14px;
    font-size: 0.78rem;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    display: none;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
  }

  .site-nav[data-open] {
    display: block;
    animation: navSlideIn 0.3s ease both;
  }

  .nav-list {
    flex-direction: column;
    gap: 0;
  }

  .nav-list__item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .nav-link {
    padding: 16px 20px;
    font-size: 1rem;
    border-left: 4px solid transparent;
    border-bottom: none;
  }

  .nav-link[aria-current="page"] {
    border-left-color: var(--c-red);
    border-bottom: none;
    box-shadow: none;
  }

  .grid--2col,
  .grid--3col {
    grid-template-columns: 1fr;
  }

  .hero-split {
    min-height: 0;
    padding: 40px 0;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 0;
  }

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

  .breadcrumb {
    margin-bottom: 20px;
  }
}

@media (max-width: 480px) {
  .container {
    width: min(100% - 36px, var(--container-w));
  }

  .brand-lockup__name {
    font-size: 1.1rem;
  }

  .brand-lockup__name-en {
    font-size: 0.38em;
  }

  .brand-lockup__sub {
    font-size: 0.66rem;
  }

  .header-fav-btn {
    font-size: 0;
    gap: 0;
    width: 42px;
    height: 42px;
    padding: 0;
    justify-content: center;
  }

  .header-fav-btn__dot {
    width: 10px;
    height: 10px;
  }

  .btn {
    width: 100%;
  }

  .panel {
    padding: 24px;
  }
}

@keyframes navSlideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}