/* ------------------------------------------------------------------
   Site Kit — 德赢安装 · /assets/site.css
   Reset / Tokens / Base / Header / Footer / Shared Components
------------------------------------------------------------------ */

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

:root {
  --c-primary-900: #0A192F;
  --c-primary-700: #172A45;
  --c-primary-500: #1D4ED8;
  --c-primary-300: #60A5FA;
  --c-yellow: #FBBF24;
  --c-teal: #0D9488;
  --c-neutral-100: #F8FAFC;
  --c-neutral-200: #E2E8F0;
  --c-neutral-700: #334155;
  --c-neutral-900: #0F172A;

  --font-heading: "Montserrat", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-body: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --container: 1180px;
  --space-1: 8px;
  --space-2: 12px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 64px;
  --space-8: 96px;
}

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

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-neutral-100);
  background-color: var(--c-primary-900);
  background-image:
    radial-gradient(900px 640px at 12% -10%, rgba(29, 78, 216, .18), transparent 60%),
    radial-gradient(720px 520px at 96% 12%, rgba(13, 148, 136, .1), transparent 55%),
    linear-gradient(115deg, transparent 33%, rgba(96, 165, 250, .035) 33.5%, transparent 34.5%),
    linear-gradient(115deg, transparent 72%, rgba(96, 165, 250, .03) 72.5%, transparent 73.5%);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 800;
  font-style: italic;
  line-height: 1.18;
  color: var(--c-neutral-100);
  text-wrap: balance;
}

p { text-wrap: pretty; }

a { color: var(--c-primary-300); text-decoration: none; }
a:hover { color: var(--c-yellow); }

button { font-family: var(--font-body); color: inherit; }

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

ul:not([class]), ol:not([class]) {
  padding-left: var(--space-4);
  margin-block: var(--space-3);
}

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

/* ---------- Utilities ---------- */

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

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

.skip-link {
  position: fixed;
  top: -72px;
  left: 16px;
  z-index: 9999;
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  background: var(--c-yellow);
  color: var(--c-primary-900);
  font-weight: 700;
  font-size: 14px;
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  transition: top .2s ease;
}

.skip-link:focus {
  top: 12px;
  color: var(--c-primary-900);
}

#main-content {
  scroll-margin-top: 24px;
  outline: none;
}

.section {
  position: relative;
  padding-block: var(--space-7) var(--space-8);
}

/* ---------- Header ---------- */

.site-header {
  position: relative;
  z-index: 20;
  background:
    radial-gradient(120% 140% at 82% -20%, rgba(29, 78, 216, .28), transparent 56%),
    linear-gradient(180deg, var(--c-primary-900) 0%, var(--c-primary-700) 100%);
  border-bottom: 1px solid rgba(96, 165, 250, .18);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(115deg, transparent 32%, rgba(251, 191, 36, .07) 32.4%, transparent 33.2%),
    linear-gradient(115deg, transparent 68%, rgba(13, 148, 136, .1) 68.4%, transparent 69.2%);
  pointer-events: none;
}

.site-ticker {
  position: relative;
  z-index: 1;
  background: rgba(10, 25, 47, .92);
  border-bottom: 1px solid rgba(96, 165, 250, .12);
  font-size: 12px;
  letter-spacing: .04em;
}

.site-ticker__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  min-height: 34px;
}

.site-ticker__info {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--c-primary-300);
  letter-spacing: .1em;
}

.site-ticker__info::before {
  content: "";
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  background: var(--c-teal);
  transform: rotate(45deg);
}

.site-ticker__contact {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.site-ticker__phone {
  color: var(--c-neutral-100);
  font-weight: 600;
}

.site-ticker__divider {
  width: 1px;
  height: 12px;
  background: rgba(96, 165, 250, .35);
}

.site-ticker__email {
  color: var(--c-primary-300);
}

.site-mast {
  position: relative;
  z-index: 1;
}

.site-mast__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 88px;
}

.site-mast__status {
  position: absolute;
  top: 50%;
  right: var(--space-4);
  transform: translateY(-50%);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-primary-300);
}

.site-mast__status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-teal);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, .22);
}

.site-mast__status-text {
  white-space: nowrap;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  color: var(--c-neutral-100);
}

.site-brand:hover { color: var(--c-neutral-100); }

.site-brand__mark {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--c-yellow) 0%, var(--c-teal) 100%);
  color: var(--c-primary-900);
  font-family: var(--font-heading);
  font-weight: 800;
  font-style: italic;
  font-size: 20px;
  line-height: 1;
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
  box-shadow: 0 10px 24px rgba(6, 17, 38, .4);
}

.site-brand__meta {
  display: grid;
  gap: 2px;
}

.site-brand__name {
  font-family: var(--font-heading);
  font-weight: 800;
  font-style: italic;
  font-size: 26px;
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--c-neutral-100);
}

.site-brand__tagline {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--c-primary-300);
}

.site-nav-toggle {
  position: absolute;
  top: 50%;
  right: var(--space-4);
  transform: translateY(-50%);
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: 1px solid rgba(96, 165, 250, .32);
  border-radius: 4px;
  cursor: pointer;
}

.site-nav-toggle:hover {
  border-color: var(--c-yellow);
}

.site-nav-toggle__bar {
  position: absolute;
  left: 10px;
  right: 10px;
  height: 2px;
  background: var(--c-neutral-100);
  border-radius: 2px;
  transition: transform .24s ease, opacity .24s ease, background .2s ease;
}

.site-nav-toggle__bar:nth-child(2) { top: 15px; }
.site-nav-toggle__bar:nth-child(3) { top: 21px; }
.site-nav-toggle__bar:nth-child(4) { top: 27px; }

.site-nav-toggle[aria-expanded="true"] .site-nav-toggle__bar:nth-child(2) {
  transform: translateY(6px) rotate(45deg);
}

.site-nav-toggle[aria-expanded="true"] .site-nav-toggle__bar:nth-child(3) {
  opacity: 0;
}

.site-nav-toggle[aria-expanded="true"] .site-nav-toggle__bar:nth-child(4) {
  transform: translateY(-6px) rotate(-45deg);
}

.site-nav {
  position: relative;
  z-index: 1;
  background: rgba(23, 42, 69, .74);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-top: 1px solid rgba(96, 165, 250, .16);
  border-bottom: 1px solid rgba(96, 165, 250, .16);
}

.site-nav__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 54px;
}

.site-nav__list {
  display: flex;
  align-items: stretch;
  gap: 2px;
}

.site-nav__item {
  display: flex;
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 12px 16px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: .02em;
  color: rgba(248, 250, 252, .88);
  white-space: nowrap;
  transition: color .2s ease;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 6px;
  height: 3px;
  background: var(--c-yellow);
  clip-path: polygon(0 0, 100% 0, calc(100% - 5px) 100%, 0 100%);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .2s ease;
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--c-yellow);
}

.site-nav__link:hover::after,
.site-nav__link:focus-visible::after,
.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.site-nav__link[aria-current="page"] {
  color: var(--c-yellow);
}

.site-nav__cta {
  position: absolute;
  right: var(--space-4);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  background: var(--c-yellow);
  color: var(--c-primary-900);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.4;
  clip-path: polygon(0 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
  transition: background .2s ease, transform .2s ease, color .2s ease;
}

.site-nav__cta::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--c-primary-900);
  transform: rotate(45deg);
}

.site-nav__cta:hover {
  background: var(--c-teal);
  color: #fff;
  transform: translateY(-1px);
}

/* ---------- Footer ---------- */

.site-footer {
  position: relative;
  margin-top: var(--space-8);
  background:
    radial-gradient(800px 500px at 92% 0%, rgba(29, 78, 216, .2), transparent 58%),
    linear-gradient(180deg, var(--c-primary-900), #061126);
  border-top: 1px solid rgba(96, 165, 250, .18);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--c-yellow) 0 28%, var(--c-teal) 28% 58%, transparent 58%);
}

.site-footer::after {
  content: "";
  position: absolute;
  top: -32px;
  right: -40px;
  width: 260px;
  height: 96px;
  background: rgba(96, 165, 250, .05);
  clip-path: polygon(100% 0, 100% 100%, 0 0);
  pointer-events: none;
}

.site-footer__inner {
  position: relative;
  padding-top: var(--space-7);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: minmax(260px, 1.6fr) 1fr 1fr 1.3fr;
  gap: var(--space-6);
}

.site-footer__brand {
  display: grid;
  justify-items: start;
  align-self: start;
  gap: var(--space-2);
}

.site-footer__trust {
  max-width: 38ch;
  font-size: 13px;
  line-height: 1.85;
  color: rgba(248, 250, 252, .6);
}

.site-footer__col,
.site-footer__contact {
  align-self: start;
}

.site-footer__heading {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: var(--space-3);
  font-family: var(--font-heading);
  font-style: normal;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--c-primary-300);
}

.site-footer__heading::after {
  content: "";
  flex: 0 0 18px;
  height: 2px;
  background: var(--c-yellow);
  clip-path: polygon(0 0, 100% 0, calc(100% - 4px) 100%, 0 100%);
  opacity: .75;
}

.site-footer__links li + li {
  margin-top: 8px;
}

.site-footer__links a {
  position: relative;
  color: rgba(248, 250, 252, .72);
  font-size: 14px;
  transition: color .2s ease, padding-left .2s ease;
}

.site-footer__links a:hover {
  color: var(--c-yellow);
  padding-left: 6px;
}

.site-footer__meta {
  display: grid;
  gap: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(248, 250, 252, .72);
}

.site-footer__meta-label {
  display: inline-block;
  min-width: 4em;
  color: var(--c-primary-300);
  font-weight: 600;
}

.site-footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-6);
  padding-block: var(--space-4);
  border-top: 1px solid rgba(96, 165, 250, .14);
}

.site-footer__legal {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.site-footer__copyright {
  font-size: 13px;
  color: rgba(248, 250, 252, .55);
}

.site-footer__icp {
  padding-left: 12px;
  border-left: 1px solid rgba(96, 165, 250, .25);
  font-size: 13px;
  color: rgba(248, 250, 252, .55);
}

.site-footer__top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: transparent;
  border: 1px solid rgba(96, 165, 250, .4);
  color: var(--c-primary-300);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  transition: background .2s ease, color .2s ease, border-color .2s ease, transform .2s ease;
}

.site-footer__top:hover {
  background: var(--c-yellow);
  border-color: var(--c-yellow);
  color: var(--c-primary-900);
  transform: translateY(-2px);
}

.site-brand--footer .site-brand__mark {
  width: 40px;
  height: 40px;
  font-size: 16px;
}

.site-brand--footer .site-brand__name {
  font-size: 22px;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 24px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  cursor: pointer;
  border: 0;
  background: transparent;
  clip-path: polygon(0 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
  transition: background .2s ease, color .2s ease, transform .2s ease, filter .2s ease;
}

.btn--primary {
  background: var(--c-yellow);
  color: var(--c-primary-900);
}

.btn--primary:hover {
  background: var(--c-yellow);
  color: var(--c-primary-900);
  filter: brightness(1.06);
  transform: translateY(-2px);
}

.btn--ghost {
  background: transparent;
  color: var(--c-neutral-100);
  box-shadow: inset 0 0 0 1px rgba(96, 165, 250, .45);
}

.btn--ghost:hover {
  background: rgba(96, 165, 250, .14);
  color: var(--c-yellow);
}

.btn--small {
  padding: 8px 16px;
  font-size: 13px;
}

/* ---------- Breadcrumb ---------- */

.breadcrumb {
  margin-bottom: var(--space-4);
}

.breadcrumb__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: rgba(248, 250, 252, .55);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: rgba(96, 165, 250, .4);
}

.breadcrumb__item a:hover { color: var(--c-yellow); }

.breadcrumb__item[aria-current="page"] {
  color: var(--c-neutral-100);
  font-weight: 600;
}

/* ---------- Panels / Tags / Section Headings ---------- */

.panel {
  position: relative;
  padding: var(--space-5);
  background: rgba(23, 42, 69, .68);
  border: 1px solid rgba(96, 165, 250, .16);
  border-radius: 4px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 18px 40px rgba(6, 17, 38, .35);
  transition: border-color .2s ease, transform .2s ease;
}

.panel:hover { border-color: rgba(96, 165, 250, .38); }

.panel--solid {
  background: var(--c-primary-700);
  backdrop-filter: none;
}

.panel--accent {
  border-top: 3px solid var(--c-yellow);
}

.panel__title {
  margin-bottom: var(--space-2);
  font-size: 20px;
}

.panel__body {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(248, 250, 252, .7);
}

.panel__badge {
  position: absolute;
  top: 14px;
  right: 14px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-body);
  font-style: normal;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--c-primary-300);
  background: rgba(96, 165, 250, .14);
  border-radius: 2px;
}

.tag::before {
  content: "";
  width: 5px;
  height: 5px;
  background: currentColor;
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

.tag--teal {
  background: rgba(13, 148, 136, .16);
  color: #2DD4BF;
}

.tag--yellow {
  background: rgba(251, 191, 36, .14);
  color: var(--c-yellow);
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-style: normal;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--c-yellow);
}

.section-kicker::before {
  content: "";
  width: 22px;
  height: 3px;
  background: var(--c-yellow);
  clip-path: polygon(0 0, 100% 0, calc(100% - 5px) 100%, 0 100%);
}

.section-title {
  margin-top: var(--space-2);
  max-width: 22ch;
  font-size: clamp(28px, 4vw, 44px);
}

.section-lead {
  margin-top: var(--space-3);
  max-width: 56ch;
  font-size: 16px;
  color: rgba(248, 250, 252, .68);
}

/* ---------- Media container ---------- */

.media {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: 160px;
  background:
    linear-gradient(135deg, rgba(96, 165, 250, .1) 25%, transparent 25%) 0 0 / 20px 20px,
    linear-gradient(225deg, rgba(96, 165, 250, .1) 25%, transparent 25%) 0 0 / 20px 20px,
    var(--c-primary-700);
  border: 1px solid rgba(96, 165, 250, .2);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  overflow: hidden;
}

.media--16-9 { aspect-ratio: 16 / 9; }
.media--4-3 { aspect-ratio: 4 / 3; }
.media--3-4 { aspect-ratio: 3 / 4; }

.media__label {
  margin: var(--space-2);
  padding: 4px 10px;
  background: rgba(10, 25, 47, .82);
  color: var(--c-primary-300);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .12em;
  border-left: 2px solid var(--c-yellow);
}

/* ---------- Scroll reveal ---------- */

html.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .6s ease, transform .6s ease;
  transition-delay: calc(var(--reveal-delay, 0) * 80ms);
}

html.js [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- Reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }

  html.js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------- Responsive ---------- */

@media (max-width: 1080px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-5);
  }
}

@media (max-width: 980px) {
  .site-nav-toggle { display: block; }
  .site-mast__status { display: none; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    background: rgba(10, 25, 47, .97);
    box-shadow: 0 24px 40px rgba(6, 17, 38, .55);
  }

  .site-nav[data-open="true"] { display: block; }

  .site-nav__inner {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    padding-block: var(--space-3);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__link {
    padding: 14px 6px;
    border-bottom: 1px solid rgba(96, 165, 250, .12);
  }

  .site-nav__link::after {
    right: auto;
    left: 6px;
    bottom: 0;
    width: 36px;
  }

  .site-nav__cta {
    position: static;
    justify-content: center;
    margin-top: var(--space-3);
  }
}

@media (max-width: 600px) {
  .container { padding-inline: var(--space-3); }

  .site-ticker__info { display: none; }
  .site-ticker__inner { justify-content: center; }
  .site-ticker__divider { display: none; }

  .site-brand__tagline { display: none; }
  .site-mast__inner { min-height: 68px; }

  .site-brand__mark {
    width: 40px;
    height: 40px;
    font-size: 16px;
  }

  .site-brand__name { font-size: 22px; }
  .site-nav-toggle { right: var(--space-3); }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }

  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-footer__icp {
    padding-left: 0;
    border-left: 0;
  }
}