:root {
  --void: #12081f;
  --deep: #1c1030;
  --panel: #261640;
  --panel-light: #32204f;
  --ink: #f3e8ff;
  --ink-muted: #c4b5d8;
  --rose: #ff3d8a;
  --rose-glow: #ff6eb0;
  --violet: #9b5cff;
  --cyan: #4de8ff;
  --amber: #ffb347;
  --border: rgba(255, 61, 138, 0.22);
  --glass: rgba(38, 22, 64, 0.72);
  --shadow: 0 16px 48px rgba(0, 0, 0, 0.45);
  --radius: 18px;
  --header-h: 56px;
  --sticky-ads-h: 0px;
  --max-w: 980px;
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--void);
  color: var(--ink);
  line-height: 1.88;
  min-height: 100vh;
  background-image:
    radial-gradient(ellipse 70% 55% at 15% -5%, rgba(255, 61, 138, 0.28), transparent 58%),
    radial-gradient(ellipse 55% 45% at 92% 8%, rgba(155, 92, 255, 0.22), transparent 52%),
    radial-gradient(ellipse 40% 35% at 50% 100%, rgba(77, 232, 255, 0.08), transparent 60%),
    linear-gradient(180deg, var(--void) 0%, var(--deep) 40%, #0e0618 100%);
}

a { color: var(--rose-glow); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--cyan); }

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

.container { width: min(100% - 22px, var(--max-w)); margin-inline: auto; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(18, 8, 31, 0.88);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  height: var(--header-h);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: 10px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  flex-shrink: 0;
}

.brand img {
  border-radius: 12px;
  width: 34px;
  height: 34px;
  object-fit: cover;
  box-shadow: 0 0 18px rgba(255, 61, 138, 0.45);
}

.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong { font-size: 0.92rem; letter-spacing: 0.06em; color: var(--rose-glow); }
.brand-text span { font-size: 0.62rem; color: var(--ink-muted); }

.main-nav {
  display: none;
  position: absolute;
  top: var(--header-h);
  left: 0;
  right: 0;
  background: rgba(28, 16, 48, 0.98);
  border-bottom: 1px solid var(--border);
  flex-direction: column;
  padding: 12px 16px;
  gap: 4px;
  box-shadow: var(--shadow);
}

.main-nav.open { display: flex; }

.main-nav a {
  color: var(--ink-muted);
  padding: 11px 14px;
  border-radius: 10px;
  font-size: 0.88rem;
}

.main-nav a:hover,
.main-nav a.active { color: var(--rose-glow); background: rgba(255, 61, 138, 0.1); }

.nav-toggle {
  background: rgba(255, 61, 138, 0.08);
  border: 1px solid var(--border);
  color: var(--rose-glow);
  font-size: 1.15rem;
  padding: 5px 11px;
  border-radius: 8px;
  cursor: pointer;
}

.btn-dl {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  background: linear-gradient(120deg, var(--rose), var(--violet));
  color: #fff;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
  box-shadow: 0 6px 24px rgba(255, 61, 138, 0.4);
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-dl:hover { color: #fff; transform: translateY(-2px); box-shadow: 0 10px 32px rgba(155, 92, 255, 0.45); }

.btn-ghost {
  background: transparent;
  border: 1.5px solid var(--violet);
  color: var(--violet);
  box-shadow: none;
}

.btn-ghost:hover { background: rgba(155, 92, 255, 0.12); color: var(--cyan); }

.nav-btn-dl { display: none; }

/* Ads */
.ads-block {
  background: linear-gradient(180deg, rgba(38, 22, 64, 0.6), rgba(18, 8, 31, 0.4));
  padding: 14px 0 16px;
  border-bottom: 1px solid var(--border);
}

#ads, #sticky-ads {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 8px;
}

#ads > div, #sticky-ads > div {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: calc(25% - 6px);
  max-width: 82px;
}

#ads img, #sticky-ads img {
  width: 65px;
  height: 65px;
  object-fit: cover;
  border-radius: 16px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.35);
  transition: transform 0.18s, box-shadow 0.18s;
}

#ads a, #sticky-ads a { display: inline-block; border-radius: 14px; }

#ads img:hover, #sticky-ads img:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 10px 28px rgba(255, 61, 138, 0.35);
}

#ads .caption, #sticky-ads .caption {
  height: 15px;
  font-size: 10px;
  color: var(--ink-muted);
  text-align: center;
  max-width: 100px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-top: 4px;
}

.sticky-ads-wrap {
  position: sticky;
  top: var(--header-h);
  z-index: 150;
  background: rgba(18, 8, 31, 0.94);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 7px 0;
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.28s, opacity 0.28s;
}

.sticky-ads-wrap.visible {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

@media (min-width: 768px) {
  .main-nav { display: flex; position: static; flex-direction: row; background: none; border: none; padding: 0; box-shadow: none; gap: 2px; }
  .nav-toggle { display: none; }
  .nav-btn-dl { display: inline-flex; }
  #ads > div, #sticky-ads > div { width: calc(12.5% - 8px); }
}

/* Hero */
.bka-hero {
  padding: 40px 0 52px;
  position: relative;
}

.bka-hero::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 10%;
  right: 10%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--rose), var(--violet), transparent);
}

.bka-badge {
  display: inline-block;
  padding: 5px 14px;
  background: rgba(255, 61, 138, 0.12);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.72rem;
  color: var(--cyan);
  letter-spacing: 0.14em;
  margin-bottom: 16px;
}

.bka-hero h1 {
  font-size: clamp(1.55rem, 5.2vw, 2.25rem);
  line-height: 1.38;
  background: linear-gradient(135deg, var(--ink), var(--rose-glow));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 22px;
  font-weight: 700;
}

.bka-lead {
  font-size: 0.94rem;
  color: var(--ink-muted);
  margin-bottom: 14px;
}

.bka-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* Sections */
.bka-section {
  padding: 46px 0;
  border-top: 1px solid rgba(155, 92, 255, 0.12);
}

.bka-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.7rem;
  color: var(--violet);
  letter-spacing: 0.16em;
  margin-bottom: 10px;
}

.bka-tag::before {
  content: "◆";
  color: var(--rose);
  font-size: 0.55rem;
}

.bka-section h2 {
  font-size: clamp(1.22rem, 4vw, 1.7rem);
  color: var(--ink);
  margin-bottom: 18px;
  line-height: 1.42;
}

.bka-section h3 {
  font-size: 1.02rem;
  color: var(--rose-glow);
  margin: 22px 0 10px;
}

.bka-section p {
  margin-bottom: 14px;
  color: var(--ink-muted);
  font-size: 0.93rem;
}

/* Modules */
.mod-text { max-width: 100%; }

.mod-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 22px 0;
}

@media (min-width: 580px) {
  .mod-cards.cols-2 { grid-template-columns: repeat(2, 1fr); }
  .mod-cards.cols-3 { grid-template-columns: repeat(3, 1fr); }
}

.bka-card {
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  backdrop-filter: blur(12px);
  transition: border-color 0.2s, transform 0.2s;
}

.bka-card:hover { border-color: rgba(255, 61, 138, 0.45); transform: translateY(-2px); }

.bka-card .card-num {
  font-size: 0.68rem;
  color: var(--cyan);
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.bka-card strong { display: block; color: var(--ink); margin-bottom: 6px; font-size: 0.9rem; }
.bka-card span { font-size: 0.83rem; color: var(--ink-muted); line-height: 1.65; }

.mod-figure {
  margin: 24px 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.mod-figure img { width: 100%; }

.mod-figure figcaption {
  padding: 12px 16px;
  background: var(--panel);
  font-size: 0.8rem;
  color: var(--ink-muted);
  border-top: 1px solid var(--border);
}

.split-37 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  align-items: start;
  margin: 24px 0;
}

@media (min-width: 768px) {
  .split-37 { grid-template-columns: 3fr 7fr; }
  .split-37.reverse { grid-template-columns: 7fr 3fr; }
}

.note-panel {
  background: linear-gradient(135deg, rgba(255, 61, 138, 0.08), rgba(155, 92, 255, 0.08));
  border-left: 3px solid var(--rose);
  padding: 18px 20px;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 20px 0;
}

.note-panel p { margin-bottom: 0; }

.kw-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0;
}

.kw-tags span {
  padding: 4px 12px;
  background: rgba(38, 22, 64, 0.8);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.76rem;
  color: var(--rose-glow);
}

.step-list {
  counter-reset: step;
  margin: 20px 0;
}

.step-list li {
  list-style: none;
  position: relative;
  padding-left: 36px;
  margin-bottom: 14px;
  color: var(--ink-muted);
  font-size: 0.9rem;
}

.step-list li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: 2px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--rose), var(--violet));
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Breadcrumb */
.breadcrumb {
  padding: 12px 0;
  font-size: 0.8rem;
  color: var(--ink-muted);
  border-bottom: 1px solid rgba(155, 92, 255, 0.1);
  background: rgba(18, 8, 31, 0.5);
}

.breadcrumb a { color: var(--rose-glow); }
.breadcrumb span { margin: 0 6px; color: var(--violet); }

/* Sub pages */
.page-head { padding: 30px 0 22px; }

.page-head h1 {
  font-size: clamp(1.35rem, 4vw, 1.75rem);
  color: var(--ink);
  margin-bottom: 10px;
}

.page-head .meta { font-size: 0.8rem; color: var(--ink-muted); }

.legal-body h2 {
  font-size: 1.08rem;
  color: var(--rose-glow);
  margin: 28px 0 12px;
}

.legal-body h3 {
  font-size: 0.96rem;
  color: var(--ink);
  margin: 18px 0 8px;
}

.legal-body p, .legal-body li {
  font-size: 0.88rem;
  color: var(--ink-muted);
  margin-bottom: 11px;
}

.legal-body ul, .legal-body ol { padding-left: 22px; margin-bottom: 14px; }

/* Error */
.err-page {
  text-align: center;
  padding: 56px 0 72px;
  min-height: 48vh;
}

.err-page h1 {
  font-size: 3.8rem;
  background: linear-gradient(135deg, var(--rose), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}

.err-page p { color: var(--ink-muted); margin-bottom: 22px; }

/* Footer */
.site-footer {
  background: rgba(14, 6, 24, 0.95);
  border-top: 1px solid var(--border);
  padding: 34px 0 26px;
  margin-top: 44px;
}

.footer-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  margin-bottom: 22px;
}

@media (min-width: 580px) {
  .footer-cols { grid-template-columns: 2fr 1fr 1fr; }
}

.footer-cols h4 {
  color: var(--rose-glow);
  font-size: 0.86rem;
  margin-bottom: 10px;
}

.footer-cols a, .footer-cols p {
  display: block;
  font-size: 0.8rem;
  color: var(--ink-muted);
  margin-bottom: 7px;
}

.footer-cols a:hover { color: var(--cyan); }

.footer-end {
  border-top: 1px solid rgba(255, 61, 138, 0.12);
  padding-top: 18px;
  font-size: 0.76rem;
  color: rgba(196, 181, 216, 0.55);
  text-align: center;
}