/**
 * BiuPro design tokens ? aligned with feicaiclub.cn
 */

:root {
  --bp-sans: "Noto Sans SC", "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --bp-mono: "JetBrains Mono", "SF Mono", ui-monospace, monospace;
  --bp-display: "Noto Sans SC", "PingFang SC", sans-serif;

  --bp-bg: #f4f4f5;
  --bp-paper: #ffffff;
  --bp-ink: #0a0a0a;
  --bp-ink-2: #1f1f1f;
  --bp-muted: #6b6b6b;
  --bp-mute-2: #a8a8a8;
  --bp-hair: #e8e8ea;
  --bp-hair-2: #d4d4d8;
  --bp-accent: #ff9500;
  --bp-accent-hov: #ef8303;
  --bp-accent-ink: #ffffff;
  --bp-brand: #395da2;
  --bp-ok: #00a85a;
  --bp-danger: #e04444;

  --bp-rail: 240px;
  --bp-r-sm: 6px;
  --bp-r-md: 10px;
  --bp-r-lg: 16px;
  --bp-ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --bp-dur: 0.32s;
}

html[data-theme="dark"] {
  --bp-bg: #0a0a0a;
  --bp-paper: #121212;
  --bp-ink: #f5f2ec;
  --bp-ink-2: #e8e4da;
  --bp-muted: #9a9a9a;
  --bp-mute-2: #5c5c5c;
  --bp-hair: #222222;
  --bp-hair-2: #2e2e2e;
  --bp-accent: #ff9500;
  --bp-accent-hov: #ef8303;
  --bp-accent-ink: #ffffff;
  --bp-brand: #395da2;
}

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

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

body.biupro {
  margin: 0;
  font-family: var(--bp-sans);
  background: var(--bp-bg);
  color: var(--bp-ink);
  line-height: 1.55;
  min-height: 100vh;
}

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

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

button,
input {
  font: inherit;
  color: inherit;
}

.bp-mono {
  font-family: var(--bp-mono);
  letter-spacing: 0.02em;
}

.bp-skip {
  position: absolute;
  left: -9999px;
}
.bp-skip:focus {
  left: 12px;
  top: 12px;
  z-index: 9999;
  background: var(--bp-accent);
  color: var(--bp-accent-ink);
  padding: 8px 12px;
  border-radius: var(--bp-r-sm);
}

.bp-app {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.bp-sidebar {
  position: fixed;
  z-index: 40;
  inset: 0 auto 0 0;
  width: var(--bp-rail);
  display: flex;
  flex-direction: column;
  background: var(--bp-paper);
  border-right: 1px solid var(--bp-hair);
  transform: translateX(-105%);
  transition: transform var(--bp-dur) var(--bp-ease);
}

body.bp-rail-open .bp-sidebar {
  transform: translateX(0);
}

.bp-rail-mask {
  position: fixed;
  inset: 0;
  z-index: 35;
  background: rgba(0, 0, 0, 0.45);
}

.bp-sidebar-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 18px 16px 12px;
  border-bottom: 1px solid var(--bp-hair);
}

.bp-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.bp-logo img {
  max-height: 32px;
  width: auto;
}

.bp-logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  background: var(--bp-accent);
  color: var(--bp-accent-ink);
  font-weight: 900;
}

.bp-side-search {
  display: flex;
  align-items: center;
  padding: 12px 14px;
}

.bp-side-search input {
  width: 100%;
  border: 1px solid var(--bp-hair);
  background: var(--bp-bg);
  border-radius: var(--bp-r-md);
  padding: 10px 12px;
  outline: none;
}

.bp-side-search input:focus {
  border-color: var(--bp-accent);
}

.bp-sidebar-scroll {
  flex: 1;
  overflow: auto;
  padding: 8px 10px 16px;
}

.bp-nav {
  list-style: none;
  margin: 0;
  padding: 0;
}

.bp-nav .bp-nav-item,
.bp-nav .menu-item {
  margin: 0;
}

.bp-nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--bp-r-md);
  color: var(--bp-muted);
  font-weight: 500;
  transition: background var(--bp-dur) var(--bp-ease), color var(--bp-dur) var(--bp-ease);
}

.bp-nav a:hover {
  background: color-mix(in srgb, var(--bp-accent) 14%, transparent);
  color: var(--bp-ink);
}
.bp-nav .is-active > a,
.bp-nav .current-menu-item > a {
  background: transparent;
  color: var(--bp-ink);
}

.bp-nav-ico {
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--bp-mute-2);
  flex: 0 0 auto;
}
.bp-nav-ico.bp-nav-ico--svg,
.bp-nav-ico.bp-ficon {
  width: 18px;
  height: 18px;
  border-radius: 0;
  background: transparent !important;
  color: var(--bp-mute-2);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.bp-nav-ico.bp-nav-ico--svg svg,
.bp-nav-ico.bp-ficon svg {
  display: block;
  width: 18px;
  height: 18px;
}
.bp-nav .is-active > a .bp-nav-ico.bp-nav-ico--svg,
.bp-nav .current-menu-item > a .bp-nav-ico.bp-nav-ico--svg,
.bp-nav a:hover .bp-nav-ico.bp-nav-ico--svg {
  color: var(--bp-accent);
  background: transparent !important;
}

.bp-nav .is-active .bp-nav-ico:not(.bp-nav-ico--svg):not(.bp-ficon),
.bp-nav .current-menu-item .bp-nav-ico:not(.bp-nav-ico--svg):not(.bp-ficon) {
  background: var(--bp-accent);
}

/* Stage */
.bp-stage {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.bp-top {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 56px;
  padding: 10px 18px;
  background: color-mix(in srgb, var(--bp-bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--bp-hair);
}

.bp-top-brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.bp-top-sep,
.bp-top-sub {
  color: var(--bp-muted);
  font-weight: 500;
  font-size: 0.92rem;
}

.bp-top-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Account panel (feicaiclub-style) */
.bp-account {
  position: relative;
}

.bp-account-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  border-radius: 999px;
}

.bp-account-avatar {
  width: 34px;
  height: 34px;
  border-radius: 999px;
  background: var(--bp-ink);
  color: var(--bp-bg);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1;
  user-select: none;
}

.bp-account-avatar--lg {
  width: 44px;
  height: 44px;
  font-size: 1.15rem;
  flex-shrink: 0;
}

.bp-account-panel {
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  z-index: 80;
  width: min(320px, calc(100vw - 24px));
  padding: 18px 16px 14px;
  border-radius: 18px;
  background: #f5f4ef;
  color: #0a0a0a;
  border: 1.5px solid #0a0a0a;
  box-shadow: 6px 6px 0 var(--bp-accent, #ff9500);
}

.bp-account-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 2px 4px 16px;
}

.bp-account-meta {
  min-width: 0;
}

.bp-account-name {
  font-weight: 800;
  font-size: 0.98rem;
  line-height: 1.25;
  word-break: break-all;
}

.bp-account-sub {
  margin-top: 3px;
  font-size: 0.78rem;
  color: #7a7a7a;
  word-break: break-all;
}

.bp-account-vip {
  display: block;
  padding: 14px 14px 12px;
  border-radius: 14px;
  background: #121212;
  color: #f5f2ec;
  text-decoration: none;
  transition: transform 0.18s var(--bp-ease);
}

.bp-account-vip:hover {
  color: #f5f2ec;
  transform: translateY(-1px);
}

.bp-account-vip-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
}

.bp-account-vip-row--foot {
  margin-top: 10px;
  align-items: flex-end;
}

.bp-account-vip-title {
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.bp-account-vip-badge {
  font-family: var(--bp-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: rgba(245, 242, 236, 0.55);
  padding-top: 4px;
}

.bp-account-vip-desc {
  font-size: 0.72rem;
  color: rgba(245, 242, 236, 0.62);
  line-height: 1.35;
  max-width: 70%;
}

.bp-account-vip-cta {
  font-size: 0.72rem;
  color: rgba(245, 242, 236, 0.72);
  white-space: nowrap;
}

.bp-account-vip.is-vip .bp-account-vip-badge {
  color: var(--bp-accent);
}

.bp-account-nav {
  margin-top: 6px;
  padding: 6px 0;
  border-top: 1px solid rgba(10, 10, 10, 0.08);
  border-bottom: 1px solid rgba(10, 10, 10, 0.08);
}

.bp-account-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 6px;
  border-radius: 10px;
  color: #0a0a0a;
  text-decoration: none;
  transition: background 0.15s var(--bp-ease);
}

.bp-account-link:hover {
  background: rgba(10, 10, 10, 0.04);
  color: #0a0a0a;
}

.bp-account-ico {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: #ebeae4;
  color: #3a3a3a;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.bp-account-link-txt {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
}

.bp-account-link-zh {
  font-weight: 700;
  font-size: 0.92rem;
  line-height: 1.2;
}

.bp-account-link-en {
  font-family: var(--bp-mono);
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  color: #9a9a9a;
}

.bp-account-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 4px 2px;
}

.bp-account-logout {
  font-size: 0.86rem;
  color: #6b5e52;
  text-decoration: none;
}

.bp-account-logout:hover {
  color: #0a0a0a;
}

.bp-account-build {
  font-family: var(--bp-mono);
  font-size: 0.62rem;
  letter-spacing: 0.04em;
  color: #b0b0b0;
  white-space: nowrap;
}

.bp-main {
  flex: 1;
  padding: 8px 0 64px;
}

.bp-footer {
  padding: 0;
  border-top: none;
}

.container-bp {
  width: min(1080px, calc(100% - 40px));
  margin-inline: auto;
}

/* Buttons */
.bp-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0.7rem 1.15rem;
  border-radius: var(--bp-r-md);
  border: 1px solid transparent;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.18s var(--bp-ease), background 0.18s var(--bp-ease);
}

.bp-btn-accent {
  background: var(--bp-accent);
  color: #ffffff;
}

.bp-btn-accent:hover {
  background: var(--bp-accent-hov);
  color: #ffffff;
  transform: translateY(-1px);
}

.bp-btn-lg {
  padding: 0.9rem 1.45rem;
  font-size: 1.05rem;
}

.bp-ghost-link,
.bp-theme-toggle,
.bp-icon-btn {
  border: 1px solid var(--bp-hair);
  background: transparent;
  border-radius: 999px;
  padding: 6px 12px;
  cursor: pointer;
  color: var(--bp-muted);
}

.bp-icon-btn {
  width: 40px;
  height: 40px;
  padding: 0;
  display: inline-grid;
  place-items: center;
  border-radius: 10px;
}

.bp-rail-toggle span {
  display: block;
  width: 16px;
  height: 2px;
  margin: 2px 0;
  background: var(--bp-ink);
}

.bp-only-mobile {
  display: inline-grid;
}

.is-member {
  color: var(--bp-accent);
}
.is-free {
  color: var(--bp-ok);
}

.bp-empty {
  color: var(--bp-muted);
  padding: 24px 0;
}

.bp-pagination {
  margin-top: 28px;
}

.bp-pagination .nav-links {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.bp-pagination a,
.bp-pagination span {
  padding: 8px 12px;
  border: 1px solid var(--bp-hair);
  border-radius: var(--bp-r-sm);
}

.bp-pagination .current {
  background: var(--bp-accent);
  color: var(--bp-accent-ink);
  border-color: transparent;
}

/* Single */
.bp-single-head,
.bp-archive-head {
  padding: 28px 0 18px;
}

.bp-single-title,
.bp-archive-head h1 {
  margin: 8px 0 12px;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.bp-single-content {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--bp-ink-2);
}

.bp-single-content a {
  color: var(--bp-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.bp-single-thumb {
  margin: 0 0 28px;
  border-radius: var(--bp-r-lg);
  overflow: hidden;
  border: 1px solid var(--bp-hair);
}

@media (min-width: 992px) {
  .bp-sidebar {
    transform: none;
  }

  .bp-stage {
    margin-left: var(--bp-rail);
  }

  .bp-rail-toggle,
  .bp-only-mobile,
  .bp-rail-mask {
    display: none !important;
  }
}

@media (max-width: 991.98px) {
  .bp-top-sub,
  .bp-top-sep {
    display: none;
  }
}


/* brand polish ? black + orange */
.bp-btn-accent {
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--bp-accent) 0%, transparent);
  transition: background var(--bp-dur) var(--bp-ease), box-shadow var(--bp-dur) var(--bp-ease), transform var(--bp-dur) var(--bp-ease);
}
.bp-btn-accent:hover {
  box-shadow: 0 8px 28px color-mix(in srgb, var(--bp-accent) 28%, transparent);
}
.bp-logo-mark,
.bp-nav a.is-active .bp-nav-ico {
  color: var(--bp-accent);
}
html[data-theme="dark"] .bp-stage {
  background:
    radial-gradient(900px 420px at 85% -10%, color-mix(in srgb, var(--bp-accent) 12%, transparent), transparent 60%),
    var(--bp-bg);
}
.bp-logo-img{display:block;max-height:36px;width:auto;}
.bp-logo-light{display:block;}
.bp-logo-dark{display:none;}
html[data-theme="dark"] .bp-logo-light{display:none;}
html[data-theme="dark"] .bp-logo-dark{display:block;}
html[data-theme="light"] .bp-logo-light{display:block;}
html[data-theme="light"] .bp-logo-dark{display:none;}
.bp-site-notice{
  position:sticky;top:0;z-index:200;
  display:flex;align-items:center;justify-content:center;flex-wrap:wrap;
  gap:10px 14px;
  padding:10px 16px;
  background:linear-gradient(90deg,#ff9500,#ef8303);
  color:#111;
  font-size:14px;line-height:1.45;
}
.bp-site-notice[hidden]{display:none!important;}
.bp-site-notice-body{flex:1 1 auto;min-width:0;text-align:center;}
.bp-site-notice-body p{margin:0;}
.bp-site-notice-body a{color:inherit;font-weight:700;text-decoration:underline;text-underline-offset:2px;}
.bp-site-notice-btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:4px 12px;border-radius:999px;
  background:rgba(0,0,0,.14);color:#111;font-weight:700;font-size:13px;
  text-decoration:none;border:1px solid rgba(0,0,0,.12);
  white-space:nowrap;
}
.bp-site-notice-btn:hover{background:rgba(0,0,0,.22);color:#111;}
.bp-site-notice-close{
  margin-left:0;padding:4px 10px;border-radius:999px;
  background:transparent;border:1px solid rgba(0,0,0,.18);
  color:#111;cursor:pointer;font-weight:600;font-size:13px;white-space:nowrap;
}
.bp-site-notice-close:hover{background:rgba(0,0,0,.1);}

/* Spotlight search modal */
.bp-search-modal[hidden]{display:none!important;}
.bp-search-modal{
  position:fixed;inset:0;z-index:1200;
  display:flex;align-items:flex-start;justify-content:center;
  padding:12vh 16px 24px;
}
.bp-search-backdrop{
  position:absolute;inset:0;
  background:rgba(0,0,0,.62);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}
.bp-search-panel{
  position:relative;z-index:1;
  width:min(640px,100%);
  background:#121212;
  color:#f0f0f0;
  border:1.5px solid #2a2a2a;
  border-radius:14px;
  /* Hard offset shadow — same language as home .bp-cat-card:hover */
  box-shadow: 8px 8px 0 0 #ff9500;
  overflow:hidden;
}
html[data-theme="dark"] .bp-search-panel,
html:not([data-theme="light"]) .bp-search-panel{
  border-color:#ffffff;
  background:#121212;
  box-shadow: 8px 8px 0 0 #ff9500;
}
html[data-theme="light"] .bp-search-panel{
  background:#fff;
  color:#0a0a0a;
  border-color:#0a0a0a;
  box-shadow: 8px 8px 0 0 #ff9500;
}
.bp-search-head{
  display:flex;align-items:center;gap:10px;
  padding:14px 16px;border-bottom:1px solid #2a2a2a;
}
html[data-theme="light"] .bp-search-head{border-bottom-color:#ececee;}
.bp-search-ico{
  width:18px;height:18px;flex:0 0 auto;opacity:.55;
  background:currentColor;
  -webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2'%3E%3Ccircle cx='11' cy='11' r='7'/%3E%3Cpath d='M20 20l-3.5-3.5'/%3E%3C/svg%3E") center/contain no-repeat;
  mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2'%3E%3Ccircle cx='11' cy='11' r='7'/%3E%3Cpath d='M20 20l-3.5-3.5'/%3E%3C/svg%3E") center/contain no-repeat;
}
.bp-search-input{
  flex:1;min-width:0;border:0;outline:none;background:transparent;
  color:inherit;font-size:1.05rem;padding:4px 0;
}
.bp-search-esc{
  font:600 .68rem/1 var(--bp-mono);padding:4px 7px;border-radius:6px;
  border:1px solid #333;color:#9a9a9a;cursor:pointer;
}
html[data-theme="light"] .bp-search-esc{border-color:#ddd;color:#888;}
.bp-search-body{min-height:160px;max-height:min(48vh,360px);overflow:auto;padding:8px;}
.bp-search-empty{
  margin:48px 0;text-align:center;color:#7a7a7a;font-size:.95rem;
}
.bp-search-list{list-style:none;margin:0;padding:0;}
.bp-search-item a{
  display:flex;flex-direction:column;gap:4px;
  padding:12px 14px;border-radius:10px;text-decoration:none;color:inherit;
}
.bp-search-item.is-active a,
.bp-search-item a:hover{
  background:rgba(57,93,162,.18);
}
html[data-theme="light"] .bp-search-item.is-active a,
html[data-theme="light"] .bp-search-item a:hover{
  background:rgba(255,149,0,.12);
}
.bp-search-item strong{font-size:.95rem;font-weight:700;}
.bp-search-meta{font-size:.75rem;color:#8a8a8a;font-family:var(--bp-mono);}
.bp-search-foot{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:10px 14px;border-top:1px solid #2a2a2a;
  font-size:.72rem;color:#8a8a8a;
}
html[data-theme="light"] .bp-search-foot{border-top-color:#ececee;}
.bp-search-keys{display:flex;flex-wrap:wrap;gap:12px;}
.bp-search-keys kbd{
  display:inline-block;min-width:1.2em;padding:2px 5px;margin-right:2px;
  border:1px solid #333;border-radius:4px;font:600 .66rem/1 var(--bp-mono);
}
html[data-theme="light"] .bp-search-keys kbd{border-color:#ddd;}
.bp-search-powered{opacity:.7;white-space:nowrap;}
body.bp-search-open{overflow:hidden;}
.bp-side-search{cursor:pointer;}
.bp-side-search input{cursor:pointer;}