/* ============================================================
   大发安装 · 平台安装 — 全站共享样式
   ============================================================ */

/* ---------- 1. Reset & Variables ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --c-primary: #0A2540;
  --c-gold: #C9A227;
  --c-accent: #FF6B35;
  --c-teal: #0F766E;
  --c-wine: #722F37;
  --c-indigo: #5B4B8A;
  --c-bg-light: #F5F7FA;
  --c-text-dark: #111827;
  --c-text-light: #FFFFFF;
  --c-text-muted: #6B7280;

  --font-heading: "Source Han Sans", "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;

  --content-width: 1200px;
  --container-pad: 1.5rem;

  --shadow-subtle: 0 2px 12px rgba(10, 37, 64, 0.08);
  --shadow-lifted: 0 8px 24px rgba(10, 37, 64, 0.14);
  --border-gold: 1px solid rgba(201, 162, 39, 0.35);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  --dur-fast: 0.2s ease;
  --dur-base: 0.3s ease;

  --z-top: 200;
  --z-header: 100;
}

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-text-dark);
  background: var(--c-bg-light);
  min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--c-primary);
}

p {
  margin-bottom: 1rem;
}
p:last-child {
  margin-bottom: 0;
}

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

ul, ol {
  list-style: none;
}

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

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

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

::selection {
  background: var(--c-gold);
  color: var(--c-primary);
}

#main-content {
  scroll-margin-top: 1rem;
}

.site-main {
  display: block;
  min-height: 60vh;
}

/* ---------- 2. Container ---------- */
.site-container {
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  width: 100%;
}

/* ---------- 3. Buttons ---------- */
.site-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.5rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background-color var(--dur-fast), border-color var(--dur-fast), transform var(--dur-fast), box-shadow var(--dur-fast), color var(--dur-fast);
  text-decoration: none;
  white-space: nowrap;
  line-height: 1.2;
}
.site-btn:hover {
  text-decoration: none;
}
.site-btn:active {
  transform: scale(0.97);
}
.site-btn--primary {
  background: var(--c-accent);
  color: #fff;
  box-shadow: 0 4px 16px rgba(255, 107, 53, 0.35);
}
.site-btn--primary:hover {
  background: #e85a2a;
  box-shadow: 0 6px 20px rgba(255, 107, 53, 0.45);
  color: #fff;
}
.site-btn--outline {
  border-color: var(--c-gold);
  color: var(--c-gold);
  background: transparent;
}
.site-btn--outline:hover {
  background: rgba(201, 162, 39, 0.08);
  color: var(--c-gold);
}
.site-btn--ghost {
  color: var(--c-text-muted);
}
.site-btn--ghost:hover {
  color: var(--c-primary);
  background: rgba(10, 37, 64, 0.05);
}

/* ---------- 4. Skip Link ---------- */
.site-skip-link {
  position: fixed;
  top: -100%;
  left: 1rem;
  z-index: calc(var(--z-top) + 10);
  background: var(--c-primary);
  color: var(--c-text-light);
  padding: 0.75rem 1.5rem;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  border: 2px solid var(--c-gold);
  border-top: none;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9rem;
  transition: top var(--dur-base);
}
.site-skip-link:focus-visible {
  top: 0;
  text-decoration: none;
}

/* ---------- 5. Scroll Progress ---------- */
.site-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  z-index: var(--z-top);
  pointer-events: none;
}
.site-progress__bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--c-gold), var(--c-accent));
  border-radius: 0 4px 4px 0;
}

/* ---------- 6. Header ---------- */
.site-header {
  background: var(--c-primary);
  position: relative;
}
.site-header::after {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--c-gold) 20%, var(--c-accent) 50%, var(--c-gold) 80%, transparent);
}

.site-header__topbar {
  background: rgba(0, 0, 0, 0.25);
  border-bottom: 1px solid rgba(201, 162, 39, 0.2);
  padding: 0.4rem 0;
}
.site-header__trust {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.78);
  text-align: center;
  letter-spacing: 0.08em;
  margin: 0;
  line-height: 1.5;
}

.site-header__main {
  padding: 2.5rem 0;
}
.site-header__main-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
}

.site-brand {
  grid-column: 2;
  justify-self: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  text-decoration: none;
}
.site-brand:hover {
  text-decoration: none;
}
.site-brand__name {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 900;
  color: var(--c-text-light);
  letter-spacing: 0.04em;
  line-height: 1.1;
  white-space: nowrap;
}
.site-brand__subtitle {
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--c-gold);
  letter-spacing: 0.45em;
  line-height: 1.2;
  margin-left: 0.45em;
  text-transform: uppercase;
}

.site-header__actions {
  grid-column: 3;
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.site-header__cta {
  font-size: 0.85rem;
  padding: 0.55rem 1.2rem;
}
.site-header__cta-arrow {
  font-size: 1.15em;
  line-height: 1;
  transition: transform var(--dur-fast);
}
.site-header__cta:hover .site-header__cta-arrow {
  transform: translateX(3px);
}

/* ---------- 7. Navigation ---------- */
.site-nav {
  border-top: 1px solid rgba(201, 162, 39, 0.22);
  background: var(--c-primary);
}
.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.2rem;
  padding: 0.45rem 0;
}
.site-nav__link {
  display: block;
  padding: 0.65rem 1.1rem;
  color: rgba(255, 255, 255, 0.88);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.86rem;
  letter-spacing: 0.12em;
  border-radius: var(--radius-sm);
  line-height: 1.3;
  transition: color var(--dur-fast), background-color var(--dur-fast), box-shadow var(--dur-fast);
  text-decoration: none;
  white-space: nowrap;
}
.site-nav__link:hover {
  color: var(--c-gold);
  background: rgba(201, 162, 39, 0.1);
  text-decoration: none;
}
.site-nav__link[aria-current="page"] {
  color: var(--c-gold);
  box-shadow: inset 0 -2px 0 var(--c-gold);
}

/* Nav toggle */
.site-nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: background-color var(--dur-fast), border-color var(--dur-fast);
}
.site-nav-toggle:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(201, 162, 39, 0.5);
}
.site-nav-toggle__bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--c-text-light);
  border-radius: 2px;
  transition: transform var(--dur-base), opacity var(--dur-fast), background-color var(--dur-base);
}
.site-nav-toggle[aria-expanded="true"] .site-nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  background: var(--c-gold);
}
.site-nav-toggle[aria-expanded="true"] .site-nav-toggle__bar:nth-child(2) {
  opacity: 0;
}
.site-nav-toggle[aria-expanded="true"] .site-nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
  background: var(--c-gold);
}

/* ---------- 8. Footer ---------- */
.site-footer {
  background: var(--c-primary);
  color: rgba(255, 255, 255, 0.82);
  border-top: 3px solid var(--c-gold);
}
.site-footer__main {
  padding: 3.5rem 0 2rem;
}
.site-footer__grid {
  display: grid;
  grid-template-columns: 1.3fr 1.5fr 0.8fr;
  gap: 3rem;
}
.site-footer__brand {
  display: flex;
  flex-direction: column;
}
.site-footer__logo {
  font-family: var(--font-heading);
  font-size: 1.7rem;
  font-weight: 900;
  color: var(--c-text-light);
  margin-bottom: 0.2rem;
  letter-spacing: 0.04em;
}
.site-footer__subtitle {
  font-size: 0.85rem;
  color: var(--c-gold);
  letter-spacing: 0.25em;
  margin-bottom: 1.2rem;
}
.site-footer__trust {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.8;
  border-left: 3px solid var(--c-gold);
  padding-left: 1rem;
  margin-top: auto;
}
.site-footer__heading {
  font-family: var(--font-heading);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--c-gold);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(201, 162, 39, 0.25);
}
.site-footer__list {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}
.site-footer__list li {
  font-size: 0.85rem;
  line-height: 1.6;
  position: relative;
  padding-left: 1.1rem;
}
.site-footer__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 5px;
  height: 5px;
  background: var(--c-gold);
  border-radius: 50%;
  opacity: 0.65;
}
.site-footer__label {
  display: block;
  font-size: 0.68rem;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 0.1rem;
}
.site-footer__list a {
  color: rgba(255, 255, 255, 0.88);
  transition: color var(--dur-fast);
}
.site-footer__list a:hover {
  color: var(--c-gold);
  text-decoration: none;
}
.site-footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 1.1rem 0;
}
.site-footer__bottom-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.5);
}

/* ---------- 9. Breadcrumb ---------- */
.breadcrumb {
  margin-bottom: 2rem;
}
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--c-text-muted);
}
.breadcrumb__item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.breadcrumb__item:not(:last-child)::after {
  content: "/";
  color: rgba(10, 37, 64, 0.3);
  font-size: 0.9em;
}
.breadcrumb__link {
  color: var(--c-text-muted);
  text-decoration: none;
  transition: color var(--dur-fast);
}
.breadcrumb__link:hover {
  color: var(--c-primary);
  text-decoration: underline;
}
.breadcrumb__item[aria-current="page"] {
  color: var(--c-primary);
  font-weight: 600;
}

/* ---------- 10. Section Heading ---------- */
.section-heading {
  margin-bottom: 2rem;
}
.section-heading__eyebrow {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--c-accent);
  text-transform: uppercase;
  letter-spacing: 0.28em;
  margin-bottom: 0.4rem;
}
.section-heading__title {
  font-family: var(--font-heading);
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 800;
  color: var(--c-primary);
  line-height: 1.2;
  margin-bottom: 0.6rem;
}
.section-heading__desc {
  font-size: 1rem;
  color: var(--c-text-muted);
  max-width: 60ch;
  line-height: 1.7;
}

/* ---------- 11. Console Panel ---------- */
.console-panel {
  background: var(--c-bg-light);
  border: 1px solid rgba(10, 37, 64, 0.08);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-subtle);
  overflow: hidden;
}
.console-panel__header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.25rem;
  background: var(--c-primary);
  border-bottom: 1px solid rgba(201, 162, 39, 0.3);
}
.console-panel__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.25);
}
.console-panel__dot--active {
  background: var(--c-accent);
  box-shadow: 0 0 8px rgba(255, 107, 53, 0.5);
}
.console-panel__title {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--c-text-light);
  letter-spacing: 0.1em;
  line-height: 1.2;
}
.console-panel__status {
  margin-left: auto;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--c-gold);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.console-panel__body {
  padding: 1.5rem;
}

/* ---------- 12. Tabs ---------- */
.tabs__tablist {
  display: flex;
  gap: 0.25rem;
  border-bottom: 2px solid rgba(10, 37, 64, 0.12);
  margin-bottom: 1.5rem;
  overflow-x: auto;
}
.tabs__tab {
  padding: 0.6rem 1.2rem;
  font-family: var(--font-heading);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--c-text-muted);
  background: transparent;
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  cursor: pointer;
  transition: color var(--dur-fast), background-color var(--dur-fast), border-color var(--dur-fast);
  white-space: nowrap;
}
.tabs__tab:hover {
  color: var(--c-primary);
  background: rgba(10, 37, 64, 0.04);
}
.tabs__tab[aria-selected="true"] {
  color: var(--c-primary);
  border-color: rgba(10, 37, 64, 0.12);
  border-bottom-color: transparent;
  background: var(--c-bg-light);
  position: relative;
  top: 2px;
}
.tabs__tab[aria-selected="true"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -3px;
  height: 3px;
  background: var(--c-gold);
  border-radius: 3px 3px 0 0;
}
.tabs__panel {
  background: var(--c-bg-light);
  padding: 1.5rem;
  border-radius: 0 var(--radius-md) var(--radius-md) var(--radius-md);
  border: 1px solid rgba(10, 37, 64, 0.08);
  box-shadow: var(--shadow-subtle);
}
.tabs__panel[hidden] {
  display: none !important;
}

/* ---------- 13. Image Container ---------- */
.site-image {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(10, 37, 64, 0.06), rgba(201, 162, 39, 0.1));
  border: 1px solid rgba(10, 37, 64, 0.06);
}
.site-image::before {
  content: "";
  display: block;
  padding-top: 56.25%;
}
.site-image--tall::before {
  padding-top: 75%;
}
.site-image--square::before {
  padding-top: 100%;
}
.site-image > * {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 14. Back to Top ---------- */
.site-backtop {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--c-primary);
  color: var(--c-text-light);
  border: 2px solid var(--c-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--dur-base), transform var(--dur-base), visibility var(--dur-base), background-color var(--dur-fast);
  z-index: 90;
  box-shadow: var(--shadow-lifted);
  line-height: 1;
}
.site-backtop[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.site-backtop:hover {
  background: #123a61;
  color: var(--c-gold);
}

/* ---------- 15. Responsive ---------- */
@media (min-width: 768px) {
  .site-nav {
    position: sticky;
    top: 0;
    z-index: var(--z-header);
  }
}

@media (max-width: 1023px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }
  .site-footer__brand {
    grid-column: 1 / -1;
  }
  .site-footer__trust {
    margin-top: 0.5rem;
  }
}

@media (max-width: 767px) {
  .site-container {
    --container-pad: 1rem;
  }

  .site-header__main {
    padding: 1rem 0;
  }
  .site-header__main-inner {
    grid-template-columns: 1fr auto;
  }
  .site-brand {
    grid-column: 1;
    justify-self: start;
    align-items: flex-start;
    gap: 0.2rem;
  }
  .site-brand__name {
    font-size: clamp(1.05rem, 4.5vw, 1.4rem);
    letter-spacing: 0.02em;
    white-space: nowrap;
  }
  .site-brand__subtitle {
    font-size: 0.58rem;
    letter-spacing: 0.2em;
    margin-left: 0.2em;
  }
  .site-header__actions {
    grid-column: 2;
  }
  .site-header__cta {
    padding: 0.4rem 0.85rem;
    font-size: 0.76rem;
    border-width: 1px;
  }
  .site-nav-toggle {
    display: flex;
    width: 40px;
    height: 40px;
    padding: 9px;
  }
  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 95;
    background: var(--c-primary);
    border-bottom: 3px solid var(--c-gold);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.25);
  }
  .site-nav[data-open] {
    display: block;
    animation: navSlideDown 0.25s ease;
  }
  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.5rem 0 0.75rem;
  }
  .site-nav__item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }
  .site-nav__item:last-child {
    border-bottom: none;
  }
  .site-nav__link {
    padding: 0.85rem 0.75rem;
    text-align: center;
    font-size: 0.95rem;
    border-radius: 0;
  }
  .site-nav__link[aria-current="page"] {
    box-shadow: inset 2px 0 0 var(--c-gold);
  }

  .site-footer__main {
    padding: 2.5rem 0 1.5rem;
  }
  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .site-footer__brand {
    grid-column: auto;
  }
  .site-footer__bottom-inner {
    flex-direction: column;
    text-align: center;
  }
}

@keyframes navSlideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 480px) {
  .site-header__main-inner {
    gap: 0.5rem;
  }
  .site-header__cta {
    padding: 0.32rem 0.6rem;
    font-size: 0.7rem;
    gap: 0.25rem;
  }
  .site-nav-toggle {
    width: 36px;
    height: 36px;
    padding: 8px;
    gap: 4px;
  }
  .site-nav-toggle[aria-expanded="true"] .site-nav-toggle__bar:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }
  .site-nav-toggle[aria-expanded="true"] .site-nav-toggle__bar:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }
  .site-brand__name {
    max-width: 170px;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .site-footer__bottom-inner {
    font-size: 0.72rem;
  }
}

/* ---------- 16. 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;
  }
}