/* ============================================
   博万APP | 全站共享样式 /assets/site.css
   ============================================ */

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

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

body {
  font-family: 'Inter', 'IBM Plex Sans', system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  font-weight: 300;
  line-height: 1.7;
  color: #FFFFFF;
  background-color: #0A192F;
  background-image:
    radial-gradient(ellipse 80% 40% at 85% -5%, rgba(74, 0, 224, 0.16), transparent),
    radial-gradient(ellipse 55% 35% at 5% 110%, rgba(142, 45, 226, 0.10), transparent);
  background-repeat: no-repeat;
  background-position: top right, bottom left;
  overflow-x: hidden;
  min-height: 100vh;
}

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

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

ul,
ol {
  list-style: none;
}

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

:focus-visible {
  outline: 2px solid #FFD700;
  outline-offset: 4px;
  border-radius: 0;
}

::selection {
  background: rgba(255, 215, 0, 0.3);
  color: #FFFFFF;
}

/* ---------- CSS Variables ---------- */
:root {
  --color-bg: #0A192F;
  --color-bg-card: #112240;
  --color-border: #1D2D50;
  --color-accent: #FFD700;
  --color-accent-dark: #E6C200;
  --color-gradient-from: #4A00E0;
  --color-gradient-to: #8E2DE2;
  --color-text: #FFFFFF;
  --color-text-secondary: #A8B2D1;
  --color-success: #4ADE80;
  --color-warning: #F97316;
  --gradient-tech: linear-gradient(135deg, #4A00E0, #8E2DE2);
  --container-max: 1440px;
  --container-padding: clamp(1.25rem, 4vw, 4rem);
  --header-height: 72px;
  --transition-base: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.15s ease;
  --font-heading: 'Inter', 'IBM Plex Sans', system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'IBM Plex Sans', system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

/* ---------- Scroll Progress ---------- */
.scroll-progress {
  position: fixed;
  top: 3px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left top;
  z-index: 60;
  pointer-events: none;
}

/* ---------- Skip Link ---------- */
.skip-link {
  position: fixed;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2000;
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 600;
  font-size: 0.875rem;
  padding: 0.75rem 1.5rem;
  transition: top 0.3s ease;
}

.skip-link:focus {
  top: 8px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 25, 47, 0.92);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
}

.site-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-tech);
  z-index: 1;
}

.header-inner {
  position: relative;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  height: var(--header-height);
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

/* ---------- Brand ---------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.brand-mark {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
}

.brand-text {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--color-text);
  line-height: 1.2;
  white-space: nowrap;
  transition: color var(--transition-base);
}

.brand:hover .brand-text {
  color: var(--color-accent);
}

/* ---------- Navigation ---------- */
.site-nav {
  flex: 1;
  display: flex;
  justify-content: center;
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 2vw, 2.25rem);
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  position: relative;
  padding: 0.4rem 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-index {
  font-size: 0.625rem;
  font-weight: 500;
  color: var(--color-accent);
  letter-spacing: 0.05em;
  opacity: 0.8;
}

.nav-label {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--color-text);
  letter-spacing: 0.02em;
  transition: color var(--transition-base);
}

.nav-link:hover .nav-label {
  color: var(--color-accent);
}

.nav-link[aria-current="page"] .nav-label {
  color: var(--color-accent);
  font-weight: 500;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.875rem;
  line-height: 1;
  padding: 0.85rem 1.75rem;
  border-radius: 0;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-bg);
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  box-shadow: 0 0 24px rgba(255, 215, 0, 0.25);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-outline:hover {
  background: var(--color-accent);
  color: var(--color-bg);
  box-shadow: 0 0 20px rgba(255, 215, 0, 0.2);
}

.header-cta {
  flex-shrink: 0;
  font-size: 0.85rem;
  padding: 0.7rem 1.4rem;
}

/* ---------- Nav Toggle (mobile) ---------- */
.nav-toggle {
  display: none;
  position: relative;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  padding: 8px;
  z-index: 80;
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 0;
  transition: transform 0.3s ease, opacity 0.3s ease, background-color var(--transition-base);
}

.nav-toggle:hover .nav-toggle-bar {
  background: var(--color-accent);
}

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

.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(-8px) rotate(-45deg);
  background: var(--color-accent);
}

/* ---------- Container & Layout ---------- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: clamp(4rem, 8vw, 8rem) var(--container-padding);
  position: relative;
}

.section-head {
  max-width: 720px;
  margin-bottom: clamp(2.5rem, 5vw, 5rem);
}

.section-index {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
  padding-left: 1.5rem;
  position: relative;
  text-transform: uppercase;
}

.section-index::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 1rem;
  height: 1px;
  background: var(--color-accent);
}

.section-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(1.75rem, 4vw, 3.25rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  max-width: 60ch;
}

.page-hero {
  padding: clamp(4rem, 8vw, 7rem) var(--container-padding) clamp(2.5rem, 5vw, 4rem);
  position: relative;
}

/* ---------- Grid ---------- */
.grid {
  display: grid;
  gap: 1.5rem;
}

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

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

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ---------- Cards ---------- */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 0;
  padding: clamp(1.5rem, 3vw, 2.5rem);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.card-hover:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
  border-color: rgba(255, 215, 0, 0.3);
}

/* ---------- Images ---------- */
.img-ratio {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
}

.img-ratio > img,
.img-cover {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- Text Utilities ---------- */
.text-gold {
  color: var(--color-accent);
}

.text-secondary {
  color: var(--color-text-secondary);
}

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

.text-small {
  font-size: 0.8125rem;
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 2rem;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.breadcrumb-item:not(:last-child)::after {
  content: '→';
  color: var(--color-accent);
  font-size: 0.75rem;
}

.breadcrumb-link {
  color: var(--color-text-secondary);
  transition: color var(--transition-base);
}

.breadcrumb-link:hover {
  color: var(--color-accent);
}

.breadcrumb-item[aria-current="page"] {
  color: var(--color-accent);
}

/* ---------- Divider ---------- */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 215, 0, 0.5), transparent);
  border: none;
  margin: 2rem 0;
}

/* ---------- Badges ---------- */
.badge {
  display: inline-block;
  padding: 0.35rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: 0;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  line-height: 1.4;
}

.badge-success {
  background: rgba(74, 222, 128, 0.1);
  border-color: var(--color-success);
  color: var(--color-success);
}

.badge-warning {
  background: rgba(249, 115, 22, 0.1);
  border-color: var(--color-warning);
  color: var(--color-warning);
}

.badge-accent {
  background: rgba(255, 215, 0, 0.1);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-tech);
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: clamp(3rem, 6vw, 5rem) var(--container-padding) 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: clamp(2rem, 4vw, 4rem);
  margin-bottom: 3rem;
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.footer-brand .brand-text {
  font-size: 1.35rem;
}

.footer-trust {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  max-width: 280px;
  line-height: 1.8;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.footer-title {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
  position: relative;
}

.footer-title::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 32px;
  height: 2px;
  background: var(--color-accent);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-link {
  display: inline-block;
  position: relative;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  transition: color var(--transition-base), transform var(--transition-base);
}

.footer-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.3s ease;
}

.footer-link:hover {
  color: var(--color-accent);
  transform: translateX(4px);
}

.footer-link:hover::after {
  transform: scaleX(1);
}

.footer-contact-list {
  gap: 0.4rem;
}

.footer-contact {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.footer-address {
  max-width: 220px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.footer-copyright {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

.footer-icp {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

/* ---------- Responsive ---------- */
@media (max-width: 1023.98px) {
  .nav-toggle {
    display: flex;
  }

  .header-cta {
    margin-left: auto;
  }

  .site-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 25, 47, 0.98);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: calc(var(--header-height) + 1rem) 2rem 2rem;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    z-index: 70;
    overflow-y: auto;
  }

  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    gap: 0;
    width: 100%;
    max-width: 340px;
  }

  .nav-item {
    width: 100%;
    text-align: center;
  }

  .nav-link {
    justify-content: center;
    align-items: baseline;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

  .nav-index {
    font-size: 0.75rem;
  }

  .nav-label {
    font-size: 1.15rem;
    font-weight: 300;
  }
}

@media (max-width: 991.98px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }

  .footer-brand-col {
    grid-column: span 2;
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 575.98px) {
  .header-inner {
    height: 60px;
    gap: 0.75rem;
    padding: 0 1.25rem;
  }

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

  .brand-text {
    font-size: 1.05rem;
  }

  .header-cta {
    font-size: 0.75rem;
    padding: 0.55rem 0.9rem;
  }

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

  .footer-brand-col {
    grid-column: auto;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
    justify-content: center;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 3rem 1.25rem;
  }
}

/* ---------- 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;
  }

  html {
    scroll-behavior: auto;
  }

  .nav-toggle-bar {
    transition: none;
  }
}