:root {
  --c-bg: #1a1a2e;
  --c-bg-alt: #16213e;
  --c-gold: #f5c518;
  --c-red: #8b0000;
  --c-red-bright: #ff4d4d;
  --c-blue: #2b2b4a;
  --c-purple: #4a2c6a;
  --c-text: #e0e0e0;
  --c-text-dim: #b0b0b0;
  --c-green: #4dff88;
  --font-title: "Noto Serif SC", "Source Han Serif SC", serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", sans-serif;
  --font-mono: "Roboto Mono", "Courier New", monospace;
  --header-h: 132px;
  --header-top-h: 72px;
  --header-bottom-h: 60px;
  --container: 1200px;
  --radius: 2px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 140px;
}

body {
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

a {
  color: var(--c-gold);
  text-decoration: none;
  transition: color .25s var(--ease);
}

a:hover {
  color: #fff;
}

ul,
ol {
  list-style: none;
}

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

.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 3000;
  background: var(--c-gold);
  color: #1a1a2e;
  font-weight: 700;
  padding: 12px 24px;
  border-radius: 2px;
  transition: top .3s var(--ease);
}

.skip-link:focus {
  top: 16px;
}

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: rgba(245, 197, 24, 0.12);
  z-index: 2500;
  pointer-events: none;
}

.progress-bar-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--c-gold), var(--c-red-bright), var(--c-purple));
  box-shadow: 0 0 12px rgba(245, 197, 24, 0.5);
  transition: width .08s linear;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 2000;
  background: rgba(26, 26, 46, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(245, 197, 24, 0.15);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
}

.header-top {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 60%, #2b2b4a 100%);
  border-bottom: 1px solid rgba(245, 197, 24, 0.12);
}

.header-top-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  height: var(--header-top-h);
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--c-text);
}

.brand-lockup:hover {
  color: var(--c-gold);
}

.brand-badge {
  position: relative;
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--c-gold), #a88400);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 3px;
  padding-left: 8px;
  flex-shrink: 0;
}

.brand-badge::after {
  content: "";
  position: absolute;
  right: 4px;
  top: 4px;
  width: 6px;
  height: 6px;
  background: var(--c-red);
  clip-path: polygon(50% 0%, 100% 100%, 0% 100%);
}

.brand-badge-dot {
  width: 6px;
  height: 6px;
  background: #1a1a2e;
  clip-path: polygon(50% 0%, 100% 100%, 0% 100%);
}

.brand-badge-line {
  width: 20px;
  height: 2px;
  background: #1a1a2e;
}

.brand-badge-line:nth-child(3) {
  width: 14px;
}

.brand-badge-line:nth-child(4) {
  width: 8px;
}

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

.brand-name {
  font-family: var(--font-title);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 2px;
  color: var(--c-gold);
  text-shadow: 0 0 18px rgba(245, 197, 24, 0.3);
}

.brand-desc {
  font-size: 11px;
  letter-spacing: 3px;
  color: var(--c-text-dim);
  text-transform: uppercase;
}

.header-trust {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(139, 0, 0, 0.3);
  border-left: 3px solid var(--c-red);
  padding: 8px 16px;
  border-radius: 0 4px 4px 0;
  animation: trustGlow 3s ease-in-out infinite alternate;
}

@keyframes trustGlow {
  0% { box-shadow: 0 0 6px rgba(139, 0, 0, 0.3); }
  100% { box-shadow: 0 0 20px rgba(245, 197, 24, 0.2); }
}

.trust-pulse {
  width: 8px;
  height: 8px;
  background: var(--c-green);
  border-radius: 50%;
  animation: pulse 1.8s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.7); }
}

.trust-label {
  font-size: 13px;
  color: var(--c-text);
  letter-spacing: 1px;
  white-space: nowrap;
}

.header-bottom {
  background: rgba(26, 26, 46, 0.95);
}

.header-bottom-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-bottom-h);
  position: relative;
}

.site-nav {
  flex: 1;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  position: relative;
  display: block;
  color: var(--c-text-dim);
  font-size: 15px;
  font-weight: 500;
  padding: 10px 18px;
  letter-spacing: 1px;
  transition: color .3s var(--ease), background .3s var(--ease);
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%;
  height: 3px;
  background: var(--c-gold);
  transition: transform .3s var(--ease);
}

.nav-links a:hover {
  color: var(--c-gold);
}

.nav-links a:hover::after {
  transform: translateX(-50%) scaleX(1);
}

.nav-links a[aria-current="page"] {
  color: var(--c-gold);
  background: rgba(245, 197, 24, 0.08);
}

.nav-links a[aria-current="page"]::after {
  transform: translateX(-50%) scaleX(1);
  background: linear-gradient(90deg, var(--c-gold), var(--c-red-bright));
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid rgba(245, 197, 24, 0.3);
  border-radius: 2px;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  transition: border-color .3s var(--ease), background .3s var(--ease);
}

.nav-toggle:hover {
  background: rgba(245, 197, 24, 0.08);
  border-color: var(--c-gold);
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--c-gold);
  transition: transform .3s var(--ease), opacity .3s var(--ease);
}

.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);
}

/* ===== Footer ===== */
.site-footer {
  background: linear-gradient(180deg, #14142a 0%, #1a1a2e 100%);
  border-top: 3px solid var(--c-gold);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -40px;
  right: -40px;
  width: 240px;
  height: 240px;
  background: radial-gradient(circle, rgba(74, 44, 106, 0.3), transparent 70%);
  pointer-events: none;
}

.site-footer::after {
  content: "DFC";
  position: absolute;
  right: 4%;
  top: 30%;
  font-family: var(--font-mono);
  font-size: 120px;
  font-weight: 900;
  color: rgba(245, 197, 24, 0.04);
  letter-spacing: -8px;
  pointer-events: none;
  z-index: 0;
}

.footer-main {
  position: relative;
  z-index: 1;
}

.footer-grid {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.4fr;
  gap: 40px;
  padding: 64px 24px 48px;
}

.footer-brand-name {
  display: inline-block;
  font-family: var(--font-title);
  font-size: 26px;
  font-weight: 900;
  color: var(--c-gold);
  letter-spacing: 2px;
  margin-bottom: 14px;
  border-left: 4px solid var(--c-red);
  padding-left: 12px;
}

.footer-brand-desc {
  font-size: 14px;
  color: var(--c-text-dim);
  line-height: 1.9;
  max-width: 360px;
}

.footer-col-title {
  font-family: var(--font-title);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-gold);
  letter-spacing: 2px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(245, 197, 24, 0.2);
  position: relative;
}

.footer-col-title::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 36px;
  height: 1px;
  background: var(--c-red);
}

.footer-col-list li {
  margin-bottom: 10px;
}

.footer-col-list a {
  color: var(--c-text-dim);
  font-size: 14px;
  transition: color .25s var(--ease), padding-left .25s var(--ease);
}

.footer-col-list a:hover {
  color: var(--c-gold);
  padding-left: 6px;
}

.contact-line {
  font-size: 13px;
  color: var(--c-text-dim);
  margin-bottom: 6px;
  line-height: 1.6;
}

.contact-line a {
  color: var(--c-gold);
  font-family: var(--font-mono);
  font-size: 13px;
}

.service-note {
  color: var(--c-text);
  border-left: 2px solid var(--c-purple);
  padding-left: 8px;
}

.footer-meta {
  position: relative;
  z-index: 1;
  border-top: 1px solid rgba(245, 197, 24, 0.12);
  background: rgba(0, 0, 0, 0.2);
}

.footer-meta-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 32px;
}

.footer-meta p {
  font-size: 13px;
  color: var(--c-text-dim);
}

.footer-license {
  font-family: var(--font-mono);
  letter-spacing: 1px;
}

.footer-icp a {
  color: var(--c-text-dim);
  font-family: var(--font-mono);
  font-size: 12px;
  border-bottom: 1px dashed rgba(176, 176, 176, 0.4);
}

.footer-icp a:hover {
  color: var(--c-gold);
  border-color: var(--c-gold);
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 12px;
}

.footer-disclaimer {
  position: relative;
  z-index: 1;
  padding: 16px 24px;
  background: linear-gradient(90deg, rgba(139, 0, 0, 0.3), rgba(74, 44, 106, 0.3), rgba(139, 0, 0, 0.3));
  border-top: 1px solid rgba(245, 197, 24, 0.1);
}

.footer-disclaimer p {
  max-width: var(--container);
  margin: 0 auto;
  text-align: center;
  font-size: 13px;
  color: var(--c-text-dim);
}

/* ===== 通用基础组件 ===== */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section-band {
  position: relative;
  padding: 56px 0;
  clip-path: polygon(0 0, 100% 4%, 100% 96%, 0 100%);
  margin: 24px 0;
}

.section-number {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-gold);
  letter-spacing: 3px;
  margin-bottom: 12px;
}

.section-number::before {
  content: "";
  width: 40px;
  height: 2px;
  background: var(--c-gold);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  background: var(--c-gold);
  color: #1a1a2e;
  border: 2px solid var(--c-gold);
  border-radius: 2px;
  cursor: pointer;
  transition: all .3s var(--ease);
  letter-spacing: 1px;
}

.btn:hover {
  background: transparent;
  color: var(--c-gold);
  box-shadow: 0 0 24px rgba(245, 197, 24, 0.25);
}

.btn-outline {
  background: transparent;
  color: var(--c-gold);
  border-color: rgba(245, 197, 24, 0.5);
}

.btn-outline:hover {
  background: var(--c-gold);
  color: #1a1a2e;
}

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

.btn-red:hover {
  background: transparent;
  color: var(--c-red-bright);
  border-color: var(--c-red-bright);
  box-shadow: 0 0 24px rgba(255, 77, 77, 0.25);
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 20px 24px;
  background: rgba(22, 33, 62, 0.8);
  border-left: 3px solid var(--c-purple);
  font-size: 13px;
  color: var(--c-text-dim);
}

.breadcrumb a {
  color: var(--c-gold);
}

.breadcrumb a:hover {
  color: #fff;
}

.breadcrumb-sep {
  color: var(--c-purple);
  font-family: var(--font-mono);
}

/* ===== 网格 ===== */
.grid {
  display: grid;
  gap: 24px;
}

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

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

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

/* ===== 卡片 ===== */
.trend-card {
  background: linear-gradient(145deg, var(--c-blue), #1f1f3a);
  padding: 24px;
  border-radius: 2px;
  border-left: 3px solid var(--c-purple);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}

.trend-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-left-color: var(--c-gold);
}

.trend-card-title {
  font-family: var(--font-title);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 8px;
}

.trend-card-value {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--c-gold);
  margin-bottom: 8px;
}

.trend-card .trend-up {
  color: var(--c-red-bright);
  font-family: var(--font-mono);
}

.trend-card .trend-down {
  color: var(--c-green);
  font-family: var(--font-mono);
}

.trend-highlight {
  background: linear-gradient(90deg, rgba(245, 197, 24, 0.12), transparent);
  border-left: 3px solid var(--c-gold);
  padding: 16px;
  font-family: var(--font-mono);
  color: var(--c-gold);
  font-size: 14px;
}

/* ===== 筛选组件 ===== */
.data-filter {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
  padding: 16px;
  background: rgba(22, 33, 62, 0.6);
  border: 1px solid rgba(245, 197, 24, 0.15);
}

.data-filter-btn {
  padding: 8px 18px;
  background: transparent;
  border: 1px solid rgba(176, 176, 176, 0.3);
  color: var(--c-text-dim);
  font-family: var(--font-body);
  font-size: 14px;
  cursor: pointer;
  border-radius: 2px;
  transition: all .3s var(--ease);
}

.data-filter-btn:hover {
  border-color: var(--c-gold);
  color: var(--c-gold);
}

.data-filter-btn[data-active="true"] {
  background: var(--c-gold);
  color: #1a1a2e;
  border-color: var(--c-gold);
  font-weight: 700;
}

.data-filter-item[data-hidden="true"] {
  display: none;
}

/* ===== 图片占位 ===== */
.img-placeholder {
  position: relative;
  background: linear-gradient(135deg, var(--c-blue), var(--c-purple));
  min-height: 240px;
  overflow: hidden;
  border: 1px solid rgba(245, 197, 24, 0.1);
}

.img-placeholder::before {
  content: attr(data-label);
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-gold);
  letter-spacing: 2px;
  background-image: linear-gradient(rgba(245, 197, 24, 0.12) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(245, 197, 24, 0.12) 1px, transparent 1px);
  background-size: 24px 24px;
}

.img-placeholder::after {
  content: "";
  position: absolute;
  right: -20%;
  bottom: -20%;
  width: 60%;
  height: 60%;
  background: radial-gradient(circle, rgba(255, 77, 77, 0.2), transparent 70%);
}

/* ===== 返回顶部 ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border: 2px solid var(--c-gold);
  background: rgba(26, 26, 46, 0.9);
  color: var(--c-gold);
  font-size: 20px;
  cursor: pointer;
  z-index: 1500;
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: all .4s var(--ease);
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--c-gold);
  color: #1a1a2e;
  box-shadow: 0 0 20px rgba(245, 197, 24, 0.4);
}

/* ===== 响应式 ===== */
@media (max-width: 992px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .header-trust {
    display: none;
  }
}

@media (max-width: 768px) {
  :root {
    --header-h: auto;
  }
  html {
    scroll-padding-top: 100px;
  }
  .header-top-inner {
    height: 64px;
    padding: 10px 16px;
  }
  .header-bottom-inner {
    height: 54px;
    padding: 0 16px;
  }
  .brand-name {
    font-size: 18px;
  }
  .brand-badge {
    width: 36px;
    height: 36px;
  }
  .brand-desc {
    font-size: 10px;
  }
  .nav-toggle {
    display: flex;
  }
  .site-nav {
    position: fixed;
    top: calc(64px + 54px);
    left: 0;
    width: 100%;
    height: 0;
    background: linear-gradient(180deg, #16213e, #1a1a2e);
    overflow: hidden;
    opacity: 0;
    transition: height .4s var(--ease), opacity .3s var(--ease);
    z-index: 1900;
    border-bottom: 2px solid var(--c-gold);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  }
  .site-nav[data-open] {
    height: auto;
    opacity: 1;
  }
  .nav-links {
    flex-direction: column;
    align-items: stretch;
    padding: 8px 16px 16px;
  }
  .nav-links a {
    padding: 14px 16px;
    border-bottom: 1px solid rgba(245, 197, 24, 0.08);
  }
  .nav-links a::after {
    display: none;
  }
  .nav-links a[aria-current="page"] {
    background: rgba(245, 197, 24, 0.12);
    border-left: 3px solid var(--c-gold);
  }
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    padding: 40px 20px 24px;
    gap: 28px;
  }
  .footer-meta-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 16px 20px;
  }
  .footer-disclaimer p {
    font-size: 12px;
  }
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
  }
  .section {
    padding: 56px 0;
  }
  .section-band {
    padding: 40px 0;
  }
}

@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;
  }
}