/* ===== Reset ===== */
*, *::before, *::after {
  box-sizing: border-box;
}
html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  background: var(--primary-bg);
}
body, h1, h2, h3, h4, h5, h6, p, ul, ol, dl, dd, figure, blockquote, fieldset {
  margin: 0;
  padding: 0;
}
ul, ol {
  list-style: none;
}
img, svg, video {
  display: block;
  max-width: 100%;
}
button {
  background: transparent;
  border: none;
  cursor: pointer;
  font: inherit;
  color: inherit;
}
a {
  color: inherit;
  text-decoration: none;
}

/* ===== CSS Variables ===== */
:root {
  --primary-bg: #0A1E3F;
  --secondary-bg: #0D2A4F;
  --accent-green: #00E676;
  --accent-gold: #FFD700;
  --text-primary: #E8F0FE;
  --text-secondary: #9DB2D0;
  --border-line: #1E3A5F;
  --hover-mask: rgba(0, 230, 118, 0.12);
  --danger-red: #FF3D71;
  --surface-glass: rgba(255, 255, 255, 0.04);

  --header-h: 60px;
  --rail-w: 240px;
  --content-max: 1200px;
  --container-pad: 24px;

  --font-display: 'Oswald', Impact, 'Arial Narrow', 'Segoe UI', sans-serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Cascadia Code', Consolas, 'Courier New', monospace;
}

@media (max-width: 599.98px) {
  :root {
    --container-pad: 16px;
  }
}

/* ===== Base ===== */
body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding-top: var(--header-h);
  background:
    linear-gradient(rgba(30, 58, 95, 0.18) 1px, transparent 1px);
  background-size: 100% 48px;
  background-color: var(--primary-bg);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

@media (min-width: 860px) {
  body {
    padding-left: var(--rail-w);
  }
}

main,
#main-content {
  display: block;
  flex: 1 0 auto;
  padding-top: 28px;
  padding-bottom: 48px;
}

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

p {
  margin-bottom: 1em;
}

a {
  color: var(--accent-green);
  transition: color 0.2s;
}
a:hover {
  color: #00C566;
}

:focus-visible {
  outline: 2px solid var(--accent-green);
  outline-offset: 2px;
}

::selection {
  background: rgba(0, 230, 118, 0.3);
  color: var(--text-primary);
}

* {
  scrollbar-width: thin;
  scrollbar-color: var(--border-line) var(--primary-bg);
}
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: var(--primary-bg);
}
::-webkit-scrollbar-thumb {
  background: var(--border-line);
  border-radius: 5px;
  border: 2px solid var(--primary-bg);
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 230, 118, 0.45);
}

/* ===== Utilities ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -60px;
  left: 16px;
  z-index: 600;
  padding: 10px 18px;
  background: var(--accent-green);
  color: var(--primary-bg);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
  border-radius: 0 0 6px 6px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  text-decoration: none;
  transition: top 0.2s ease;
}
.skip-link:focus-visible {
  top: 0;
}

.scroll-progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-green), var(--accent-gold));
  z-index: 100;
  pointer-events: none;
}

.icon {
  display: inline-block;
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}

/* ===== Header ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 300;
}

.header-topbar {
  position: relative;
  height: var(--header-h);
  background: var(--primary-bg);
  border-bottom: 1px solid var(--border-line);
  z-index: 1;
}
@supports (backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px)) {
  .header-topbar {
    background: rgba(10, 30, 63, 0.92);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
  }
}

.header-topbar__inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 0 var(--container-pad);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.brand-mark__logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: var(--accent-gold);
  color: var(--primary-bg);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  clip-path: polygon(9px 0, 100% 0, calc(100% - 9px) 100%, 0 100%);
}
.brand-mark__text {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-primary);
  white-space: nowrap;
  transition: color 0.2s;
}
.brand-mark:hover .brand-mark__text {
  color: var(--accent-gold);
}

.header-quick {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}
.header-quick__link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 12px;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.3;
  border-radius: 3px;
  transition: color 0.2s, background-color 0.2s;
}
.header-quick__link:hover {
  color: var(--text-primary);
  background: var(--hover-mask);
}

.header-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px 5px 18px;
  background: rgba(0, 230, 118, 0.08);
  border: 1px solid rgba(0, 230, 118, 0.22);
  clip-path: polygon(9px 0, 100% 0, calc(100% - 9px) 100%, 0 100%);
  white-space: nowrap;
  flex-shrink: 0;
}
.header-status__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 6px rgba(0, 230, 118, 0.7);
  flex-shrink: 0;
}
.header-status__text {
  font-size: 13px;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-left: 4px;
  border: 1px solid var(--border-line);
  border-radius: 4px;
  color: var(--text-primary);
  flex-shrink: 0;
  transition: border-color 0.2s, color 0.2s, background-color 0.2s;
}
.nav-toggle:hover {
  border-color: var(--accent-green);
  color: var(--accent-green);
}
.nav-toggle__icon {
  width: 18px;
  height: 18px;
}
.nav-toggle__icon--close {
  display: none;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon--open {
  display: none;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon--close {
  display: block;
}

/* ===== Side Rail Navigation ===== */
.side-rail {
  position: fixed;
  top: var(--header-h);
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  z-index: 250;
  background:
    radial-gradient(ellipse at 20% 0%, rgba(0, 230, 118, 0.05), transparent 55%),
    linear-gradient(175deg, var(--secondary-bg), var(--primary-bg));
  border-right: 1px solid var(--border-line);
  overflow-y: auto;
  overflow-x: hidden;
}

.side-rail__inner {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 18px 0 20px;
}

.side-rail__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 0 10px;
}

.side-rail__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 14px;
  border-radius: 4px;
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.35;
  transition: color 0.2s, background-color 0.2s;
}
.side-rail__link::before {
  content: '';
  position: absolute;
  left: -3px;
  top: 50%;
  width: 3px;
  height: 18px;
  background: linear-gradient(180deg, var(--accent-green), var(--accent-gold));
  border-radius: 1px;
  transform: translateY(-50%) skewY(-16deg);
  opacity: 0;
  transition: opacity 0.2s;
}
.side-rail__link:hover {
  color: var(--text-primary);
  background: var(--hover-mask);
}
.side-rail__link:hover::before {
  opacity: 1;
}
.side-rail__link[aria-current="page"] {
  color: var(--text-primary);
  background: linear-gradient(90deg, var(--hover-mask), rgba(255, 215, 0, 0.04) 60%, transparent);
}
.side-rail__link[aria-current="page"]::before {
  opacity: 1;
}

.side-rail__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  min-width: 24px;
  text-align: right;
  flex-shrink: 0;
}
.side-rail__link[aria-current="page"] .side-rail__num {
  color: var(--accent-gold);
  font-weight: 700;
}

.side-rail__label {
  flex: 1;
  letter-spacing: 0.03em;
}

.side-rail__foot {
  position: relative;
  overflow: hidden;
  margin: auto 10px 6px;
  padding: 16px;
  border: 1px solid var(--border-line);
  border-radius: 6px;
  background: var(--surface-glass);
}
.side-rail__foot::before {
  content: '';
  position: absolute;
  top: -18px;
  right: -18px;
  width: 60px;
  height: 40px;
  background: repeating-linear-gradient(
    -55deg,
    transparent 0 8px,
    rgba(0, 230, 118, 0.05) 8px 16px
  );
  pointer-events: none;
}
.side-rail__tip {
  margin: 0 0 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-secondary);
}
.side-rail__download {
  display: block;
  padding: 9px 12px;
  background: var(--accent-green);
  color: var(--primary-bg);
  font-size: 14px;
  font-weight: 600;
  text-align: center;
  border-radius: 3px;
  transition: background-color 0.2s;
}
.side-rail__download:hover {
  background: #00C566;
  color: var(--primary-bg);
}

/* ===== Nav Backdrop & Mobile Drawer ===== */
.nav-backdrop {
  display: none;
}

@media (max-width: 859.98px) {
  .nav-backdrop {
    display: block;
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 240;
    background: rgba(4, 12, 28, 0.55);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0.25s;
  }
  .nav-backdrop[data-open] {
    opacity: 1;
    visibility: visible;
  }

  .side-rail {
    width: min(var(--rail-w), 84vw);
    transform: translateX(-105%);
    transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 6px 0 30px rgba(0, 0, 0, 0.35);
  }
  .side-rail[data-open] {
    transform: translateX(0);
  }

  .nav-toggle {
    display: inline-flex;
  }

  .header-quick {
    display: none;
  }

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

@media (min-width: 860px) {
  .side-rail {
    transform: none;
  }
}

/* ===== Footer ===== */
.site-footer {
  position: relative;
  flex-shrink: 0;
  margin-top: auto;
  background: linear-gradient(180deg, var(--secondary-bg) 0%, #07182E 100%);
  border-top: 1px solid var(--border-line);
}

.footer-main {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 56px var(--container-pad) 40px;
  display: grid;
  grid-template-columns: 2.2fr 1fr 1fr 1.3fr;
  gap: 40px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
}

.brand-mark--footer .brand-mark__logo {
  width: 34px;
  height: 34px;
  font-size: 14px;
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}
.brand-mark--footer .brand-mark__text {
  font-size: 18px;
}

.footer-trust {
  max-width: 400px;
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-secondary);
}

.footer-feedback {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border: 1px solid var(--accent-gold);
  border-radius: 3px;
  color: var(--accent-gold);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
  overflow: hidden;
  transition: color 0.2s, border-color 0.2s;
}
.footer-feedback::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 100%;
  background: var(--accent-gold);
  transform: translateX(-101%);
  transition: transform 0.2s;
}
.footer-feedback:hover {
  color: var(--primary-bg);
  border-color: var(--accent-gold);
}
.footer-feedback:hover::before {
  transform: translateX(0);
}
.footer-feedback span {
  position: relative;
  z-index: 1;
}
.footer-feedback__arrow {
  font-size: 16px;
  transition: transform 0.2s;
}
.footer-feedback:hover .footer-feedback__arrow {
  transform: translateX(3px);
}

.footer-col__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--text-primary);
}

.footer-col__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.footer-col__list a {
  position: relative;
  display: inline-block;
  padding-left: 14px;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.5;
  transition: color 0.2s;
}
.footer-col__list a::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 5px;
  height: 5px;
  background: var(--accent-gold);
  border-radius: 1px;
  transform: translateY(-50%) skewY(-18deg);
  opacity: 0;
  transition: opacity 0.2s;
}
.footer-col__list a:hover {
  color: var(--accent-green);
}
.footer-col__list a:hover::before {
  opacity: 1;
}

.footer-contact__list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.footer-contact__item {
  display: flex;
  flex-direction: column;
  gap: 3px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-secondary);
}
.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--accent-gold);
}

.footer-bottom {
  border-top: 1px solid var(--border-line);
  background: rgba(4, 12, 28, 0.65);
}
.footer-bottom__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 16px var(--container-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.footer-bottom__copyright,
.footer-bottom__links {
  margin: 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-secondary);
}
.footer-bottom__links {
  display: flex;
  align-items: center;
  gap: 10px;
}
.footer-bottom__links a {
  color: var(--text-secondary);
  transition: color 0.2s;
}
.footer-bottom__links a:hover {
  color: var(--accent-green);
}
.footer-bottom__links [aria-hidden="true"] {
  color: var(--border-line);
}

@media (max-width: 1023.98px) {
  .footer-main {
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 32px;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 599.98px) {
  .footer-main {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 40px var(--container-pad) 32px;
  }
  .footer-col__title {
    margin-bottom: 12px;
  }
  .footer-bottom__inner {
    flex-direction: column;
    text-align: center;
  }
}

/* ===== Shared Components ===== */
.container {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding-left: var(--container-pad);
  padding-right: var(--container-pad);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 3px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.btn--primary {
  background: var(--accent-green);
  color: var(--primary-bg);
}
.btn--primary:hover {
  background: #00C566;
  box-shadow: 0 4px 18px rgba(0, 230, 118, 0.25);
}
.btn--ghost {
  background: transparent;
  border: 1px solid var(--border-line);
  color: var(--text-primary);
}
.btn--ghost:hover {
  border-color: var(--accent-green);
  color: var(--accent-green);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 28px;
  padding: 0;
  list-style: none;
  font-size: 14px;
  color: var(--text-secondary);
}
.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.breadcrumb li:not(:first-child)::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 10px;
  margin: 0 4px;
  background: currentColor;
  clip-path: polygon(0 0, 100% 45%, 0 100%, 20% 45%);
  opacity: 0.4;
}
.breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}
.breadcrumb a:hover {
  color: var(--accent-green);
}
.breadcrumb [aria-current="page"] {
  color: var(--text-primary);
}

.page-head {
  margin-bottom: 36px;
}
.page-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(30px, 4vw, 46px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--text-primary);
}
.page-title::after {
  content: '';
  display: block;
  width: 56px;
  height: 4px;
  margin-top: 14px;
  background: linear-gradient(90deg, var(--accent-green), var(--accent-gold));
  clip-path: polygon(0 0, 100% 0, 88% 100%, 0 100%);
}
.page-lead {
  max-width: 720px;
  margin: 0;
  font-size: 17px;
  line-height: 1.75;
  color: var(--text-secondary);
}

.grid--2,
.grid--3 {
  display: grid;
  gap: 24px;
}
.grid--2 {
  grid-template-columns: repeat(2, 1fr);
}
.grid--3 {
  grid-template-columns: repeat(3, 1fr);
}
@media (max-width: 767.98px) {
  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 479.98px) {
  .grid--2,
  .grid--3 {
    grid-template-columns: 1fr;
  }
}

.card {
  padding: 22px;
  background: var(--surface-glass);
  border: 1px solid var(--border-line);
  border-radius: 6px;
  transition: border-color 0.2s, background-color 0.2s, transform 0.2s;
}
.card:hover {
  border-color: rgba(0, 230, 118, 0.4);
  background: rgba(255, 255, 255, 0.06);
  transform: translateY(-2px);
}
.card__title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 600;
  font-family: var(--font-display);
}
.card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-secondary);
}

.image-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--secondary-bg);
  border: 1px solid var(--border-line);
  border-radius: 4px;
  transition: border-color 0.2s;
}
.image-frame:hover {
  border-color: rgba(0, 230, 118, 0.4);
}
.image-frame img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border: 1px solid var(--border-line);
  border-radius: 999px;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1.55;
}
.tag--green {
  color: var(--accent-green);
  border-color: rgba(0, 230, 118, 0.4);
}
.tag--gold {
  color: var(--accent-gold);
  border-color: rgba(255, 215, 0, 0.4);
}

.data-num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  color: var(--accent-gold);
}
.data-line {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border-line);
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text-secondary);
}

/* ===== 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;
  }
  .card:hover {
    transform: none;
  }
  .footer-feedback:hover .footer-feedback__arrow {
    transform: none;
  }
}