/* ============================================================
   的方式APP / 开博体育 — SITE KIT
   File: /assets/site.css
   Design System: DATA FIELD CONSOLE
   ============================================================ */

/* ---------- 01 RESET ---------- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* ---------- 02 CSS VARIABLES ---------- */
:root {
  --color-bg-primary: #0A192F;
  --color-bg-secondary: #112240;
  --color-bg-deep: #1D2A3A;
  --color-accent: #FF6B35;
  --color-accent-2: #FF8C42;
  --color-bg-light: #F0F4F8;
  --color-text: #1A202C;
  --color-border: #E2E8F0;
  --color-text-light: #F0F4F8;
  --color-text-muted: rgba(240, 244, 248, 0.6);

  --font-heading: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-data: "SF Mono", "Cascadia Code", "Menlo", "Roboto Mono", Consolas, "Courier New", monospace;

  --header-width: 280px;
  --header-height: 72px;
  --content-max: 1200px;
  --content-padding: 24px;
  --radius: 12px;
  --border-w: 2px;

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

  --shadow-btn: 4px 4px 0 0 var(--color-bg-primary);
  --shadow-card: 4px 4px 0 0 rgba(10, 25, 47, 0.18);
}

/* ---------- 03 BASE ---------- */
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

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

a {
  color: var(--color-accent);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  color: inherit;
}

#main-content {
  display: block;
}

#main-content:focus {
  outline: none;
}

.mono {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
}

code, kbd, samp {
  font-family: var(--font-data);
  font-size: 0.875em;
}

/* ---------- 04 ACCESSIBILITY ---------- */
.skip-link {
  position: fixed;
  top: var(--space-2);
  left: var(--space-2);
  z-index: 1000;
  display: inline-block;
  padding: 12px 20px;
  background: var(--color-accent);
  color: var(--color-bg-light);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 700;
  text-decoration: none;
  border-radius: 8px;
  box-shadow: 4px 4px 0 0 var(--color-bg-primary);
  transform: translateY(-250%);
  transition: transform 0.2s ease;
}
.skip-link:focus-visible {
  transform: translateY(0);
}

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

/* ---------- 05 HEADER ---------- */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  z-index: 300;
  width: 100%;
  height: var(--header-height);
  background-color: var(--color-bg-secondary);
  background-image:
    linear-gradient(rgba(10, 25, 47, 0.4) 1px, transparent 1px),
    linear-gradient(90deg, rgba(10, 25, 47, 0.4) 1px, transparent 1px);
  background-size: 24px 24px;
  color: var(--color-text-light);
  box-shadow: 0 4px 12px rgba(10, 25, 47, 0.18);
}
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(10, 25, 47, 0.28) 100%);
  pointer-events: none;
}
.site-header::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-2));
  z-index: 5;
  pointer-events: none;
}

.header-inner {
  height: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--content-padding);
  display: flex;
  align-items: center;
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  width: 100%;
  flex-shrink: 0;
}

/* brand */
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: inherit;
}

.brand-symbol {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: 2px solid rgba(255, 107, 53, 0.8);
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-bg-primary) 0%, #16324f 100%);
  flex-shrink: 0;
}
.brand-symbol::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 50%;
  width: 1px;
  background: var(--color-accent);
  transform: translateX(-50%);
}
.brand-symbol::after {
  content: "";
  position: absolute;
  left: 8px;
  right: 8px;
  top: 50%;
  height: 1px;
  background: var(--color-accent);
  transform: translateY(-50%);
}
.brand-symbol-dot {
  position: relative;
  z-index: 1;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 1px;
}

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

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--color-text-light);
}

.brand-en {
  font-family: var(--font-data);
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  color: rgba(240, 244, 248, 0.5);
  text-transform: uppercase;
  white-space: nowrap;
}

/* nav toggle */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 10px 14px;
  border: 1px solid rgba(226, 232, 240, 0.25);
  border-radius: 8px;
  background: transparent;
  color: var(--color-text-light);
  font-family: var(--font-body);
  font-size: 0.875rem;
  cursor: pointer;
  transition: border-color 0.2s ease;
  position: relative;
  z-index: 315;
}
.nav-toggle:hover {
  border-color: var(--color-accent);
}
.nav-toggle-label {
  font-weight: 600;
  letter-spacing: 0.06em;
}
.nav-toggle-burger {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
}
.burger-line {
  width: 16px;
  height: 2px;
  background: var(--color-text-light);
  transition: transform 0.25s ease, opacity 0.2s ease;
}
.nav-toggle[aria-expanded="true"] .burger-line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .burger-line:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .burger-line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* site nav — mobile drawer */
.site-nav {
  position: fixed;
  top: var(--header-height);
  right: 0;
  bottom: 0;
  width: min(320px, 85vw);
  background-color: var(--color-bg-secondary);
  background-image:
    linear-gradient(rgba(10, 25, 47, 0.4) 1px, transparent 1px),
    linear-gradient(90deg, rgba(10, 25, 47, 0.4) 1px, transparent 1px);
  background-size: 24px 24px;
  border-left: 2px solid var(--color-accent);
  transform: translateX(100%);
  transition: transform 0.3s ease;
  z-index: 310;
  overflow-y: auto;
  padding: var(--space-4) 0;
}
.site-nav[data-open] {
  transform: translateX(0);
}

.nav-list {
  list-style: none;
}

.nav-item {
  border-bottom: 1px solid rgba(226, 232, 240, 0.08);
}
.nav-item:first-child {
  border-top: 1px solid rgba(226, 232, 240, 0.08);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 14px 20px;
  color: rgba(240, 244, 248, 0.82);
  text-decoration: none;
  position: relative;
  transition: background-color 0.2s ease, color 0.2s ease;
}
.nav-link:hover {
  background: rgba(255, 107, 53, 0.08);
  box-shadow: inset 3px 0 0 var(--color-accent);
  color: var(--color-text-light);
}
.nav-link[aria-current="page"] {
  background: rgba(255, 107, 53, 0.1);
  box-shadow: inset 3px 0 0 var(--color-accent);
}
.nav-link[aria-current="page"] .nav-link-label {
  color: var(--color-accent);
}
.nav-link[aria-current="page"] .nav-link-index {
  color: var(--color-accent-2);
}
.nav-link[aria-current="page"] .nav-link-en {
  color: rgba(255, 107, 53, 0.6);
}

.nav-link-index {
  font-family: var(--font-data);
  font-size: 0.6875rem;
  color: var(--color-accent);
  min-width: 24px;
}
.nav-link-label {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.04em;
}
.nav-link-en {
  font-family: var(--font-data);
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  color: rgba(240, 244, 248, 0.4);
  margin-left: auto;
  text-transform: uppercase;
}

/* header meta */
.header-meta {
  display: none;
}

/* header progress */
.header-progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-2));
  z-index: 8;
  pointer-events: none;
}

/* nav backdrop */
.nav-backdrop {
  display: block;
  position: fixed;
  inset: 0;
  background: rgba(10, 25, 47, 0.72);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  z-index: 305;
}
.nav-backdrop[data-open] {
  opacity: 1;
  pointer-events: auto;
}

/* ---------- 06 DESKTOP HEADER ---------- */
@media (min-width: 1024px) {
  .site-header {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--header-width);
    height: 100vh;
    border-right: 3px solid var(--color-accent);
    box-shadow: 4px 0 12px rgba(10, 25, 47, 0.12);
  }
  .site-header::after {
    width: var(--header-width);
  }

  .header-inner {
    flex-direction: column;
    align-items: stretch;
    max-width: none;
    padding: 0;
    height: 100vh;
  }

  .header-top {
    display: block;
    padding: var(--space-5) var(--space-5) var(--space-4);
    border-bottom: 1px solid rgba(226, 232, 240, 0.15);
  }

  .nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    width: auto;
    flex: 1;
    transform: none;
    transition: none;
    border-left: 0;
    background: transparent;
    padding: var(--space-4) 0;
    overflow-y: auto;
  }
  .site-nav[data-open] {
    transform: none;
  }

  .header-meta {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-5);
    border-top: 1px solid rgba(226, 232, 240, 0.15);
    background: rgba(10, 25, 47, 0.2);
    flex-shrink: 0;
  }
  .header-meta-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  .header-meta-label {
    font-family: var(--font-data);
    font-size: 0.625rem;
    letter-spacing: 0.08em;
    color: rgba(240, 244, 248, 0.45);
  }
  .header-meta-value {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-data);
    font-size: 0.6875rem;
    color: var(--color-text-light);
  }
  .status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-accent);
    flex-shrink: 0;
    position: relative;
  }
  .status-dot::after {
    content: "";
    position: absolute;
    inset: -3px;
    border: 1px solid var(--color-accent);
    border-radius: 50%;
    animation: status-pulse 2.2s cubic-bezier(0.4, 0, 0.2, 1) infinite;
  }
  @keyframes status-pulse {
    0% { transform: scale(0.6); opacity: 1; }
    100% { transform: scale(1.6); opacity: 0; }
  }
  .header-coord {
    display: flex;
    justify-content: space-between;
    padding-top: var(--space-3);
    margin-top: var(--space-3);
    border-top: 1px dashed rgba(226, 232, 240, 0.15);
    font-family: var(--font-data);
    font-size: 0.625rem;
    color: rgba(240, 244, 248, 0.3);
    letter-spacing: 0.06em;
  }

  .nav-backdrop {
    display: none;
  }
}

/* ---------- 07 FOOTER ---------- */
.site-footer {
  background-color: var(--color-bg-deep);
  background-image:
    linear-gradient(rgba(10, 25, 47, 0.4) 1px, transparent 1px),
    linear-gradient(90deg, rgba(10, 25, 47, 0.4) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--color-text-light);
  font-family: var(--font-body);
}
.site-footer::before {
  content: "";
  display: block;
  height: 8px;
  background: repeating-linear-gradient(
    -45deg,
    var(--color-accent) 0,
    var(--color-accent) 10px,
    var(--color-bg-deep) 10px,
    var(--color-bg-deep) 20px
  );
}

.footer-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-7) var(--content-padding) var(--space-5);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.4fr;
  gap: var(--space-6);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid rgba(226, 232, 240, 0.12);
}

.footer-brand .brand {
  margin-bottom: var(--space-4);
}
.footer-brand-link .brand-name {
  font-size: 1.375rem;
}
.footer-brand-link .brand-en {
  color: rgba(240, 244, 248, 0.45);
}

.footer-trust {
  max-width: 40ch;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: rgba(240, 244, 248, 0.6);
  margin-bottom: var(--space-4);
}

.footer-cert {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px 14px;
  border: 1px solid rgba(255, 107, 53, 0.35);
  border-radius: 4px;
  font-family: var(--font-data);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--color-accent-2);
  background: rgba(10, 25, 47, 0.3);
}

.footer-title {
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid rgba(255, 107, 53, 0.25);
  display: inline-block;
}

.footer-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-list li {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: rgba(240, 244, 248, 0.7);
}
.footer-list a {
  color: rgba(240, 244, 248, 0.7);
  text-decoration: none;
  transition: color 0.2s ease, padding-left 0.2s ease;
}
.footer-list a:hover {
  color: var(--color-accent);
  padding-left: 6px;
}

.footer-contact-note {
  margin-top: var(--space-4);
  font-size: 0.75rem;
  line-height: 1.6;
  color: rgba(240, 244, 248, 0.4);
  border-left: 2px solid var(--color-accent);
  padding-left: var(--space-3);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-top: var(--space-4);
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: rgba(240, 244, 248, 0.35);
}

/* ---------- 08 DESKTOP FOOTER OFFSET ---------- */
@media (min-width: 1024px) {
  #main-content,
  .site-footer {
    margin-left: var(--header-width);
  }
}

/* ---------- 09 SHARED COMPONENTS ---------- */
.container {
  max-width: var(--content-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--content-padding);
  padding-right: var(--content-padding);
}

.section {
  padding-top: var(--space-7);
  padding-bottom: var(--space-7);
}

.prose {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text);
}
.prose p {
  margin-bottom: var(--space-4);
}
.prose h2,
.prose h3,
.prose h4 {
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
}
.prose h2 {
  font-size: 1.75rem;
}
.prose h3 {
  font-size: 1.375rem;
}
.prose ul,
.prose ol {
  margin: 0 0 var(--space-4) var(--space-5);
}
.prose li {
  margin-bottom: var(--space-2);
}
.prose a {
  color: var(--color-accent);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.prose blockquote {
  margin: var(--space-5) 0;
  padding: var(--space-4) var(--space-5);
  border-left: 4px solid var(--color-accent);
  background: rgba(255, 107, 53, 0.06);
  font-style: italic;
}

/* buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 12px 24px;
  border: var(--border-w) solid var(--color-text);
  border-radius: 8px;
  background: transparent;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  box-shadow: var(--shadow-btn);
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 0 var(--color-bg-primary);
}
.btn:active {
  transform: translate(0, 0);
  box-shadow: 2px 2px 0 0 var(--color-bg-primary);
}

.btn-primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-bg-light);
}
.btn-primary:hover {
  background: var(--color-accent-2);
  border-color: var(--color-accent-2);
}

.btn-outline {
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.btn-outline:hover {
  background: var(--color-accent);
  color: var(--color-bg-light);
}

/* cards */
.card {
  background: var(--color-bg-light);
  border: var(--border-w) solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-5);
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.card:hover {
  box-shadow: 6px 6px 0 0 rgba(10, 25, 47, 0.18);
  transform: translate(-2px, -2px);
}
.card-dark {
  background: var(--color-bg-secondary);
  border-color: rgba(226, 232, 240, 0.15);
  color: var(--color-text-light);
}
.card-dark .card-title {
  color: var(--color-text-light);
}
.card-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--space-3);
  color: var(--color-text);
}
.card-body {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: inherit;
}

/* tags */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border: 1px solid;
  border-radius: 4px;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}
.tag-orange {
  background: rgba(255, 107, 53, 0.1);
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.tag-blue {
  background: rgba(10, 25, 47, 0.08);
  border-color: var(--color-bg-primary);
  color: var(--color-bg-primary);
}

/* grids */
.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: var(--space-5);
}
.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

/* breadcrumb */
.breadcrumb {
  margin-bottom: var(--space-5);
  font-size: 0.875rem;
}
.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
}
.breadcrumb-item {
  display: inline-flex;
  align-items: center;
}
.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-right: var(--space-2);
  font-family: var(--font-data);
  color: var(--color-accent);
}
.breadcrumb-link {
  color: rgba(26, 32, 44, 0.6);
  text-decoration: none;
}
.breadcrumb-link:hover {
  color: var(--color-accent);
}
.breadcrumb-current {
  color: var(--color-text);
  font-weight: 600;
}

/* image frame */
.img-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background-color: var(--color-bg-secondary);
  background-image:
    linear-gradient(rgba(240, 244, 248, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(240, 244, 248, 0.05) 1px, transparent 1px);
  background-size: 20px 20px;
  border: var(--border-w) solid var(--color-border);
  border-radius: var(--radius);
  aspect-ratio: 16 / 9;
}
.img-frame::after {
  content: attr(data-code);
  position: absolute;
  right: 8px;
  bottom: 8px;
  font-family: var(--font-data);
  font-size: 0.625rem;
  color: var(--color-accent-2);
  pointer-events: none;
}
.img-frame[data-code]::after {
  padding: 4px 8px;
  background: rgba(10, 25, 47, 0.82);
  border-radius: 4px;
  letter-spacing: 0.08em;
}
.img-frame img,
.img-frame .img-placeholder {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.img-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-data);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: rgba(240, 244, 248, 0.4);
}

/* ---------- 10 RESPONSIVE ---------- */
@media (max-width: 1023px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 767px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 420px) {
  .brand-en {
    display: none;
  }
}

/* ---------- 11 REDUCED MOTION ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }
}