/* ==========================================================================
   博亚娱乐中心 · 全站共享样式 /assets/site.css
   ========================================================================== */

/* ----------------------------------------------------------
   1. 设计令牌
   ---------------------------------------------------------- */
:root {
  --bj-space: #0B1026;
  --bj-ink: #141A3A;
  --bj-ink-2: #1B2350;
  --bj-purple: #7B5CFF;
  --bj-purple-soft: #A78BFA;
  --bj-orange: #FF6B35;
  --bj-teal: #2ED3B7;
  --bj-paper: #F5EFE6;
  --bj-white: #EEF2FF;
  --bj-slate: #8A93B8;
  --bj-pink: #FF4D8D;
  --bj-on-paper: #10142C;

  --bj-line: rgba(167, 139, 250, .22);
  --bj-line-strong: rgba(167, 139, 250, .46);
  --bj-glass: rgba(20, 26, 58, .74);

  --bj-font-display: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system,
    "Segoe UI", Roboto, sans-serif;
  --bj-font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system,
    "Segoe UI", Roboto, sans-serif;
  --bj-font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono",
    "Cascadia Mono", Consolas, "Liberation Mono", Menlo, monospace;

  --bj-shell: 1240px;
  --bj-measure: 620px;
  --bj-radius-pill: 999px;
  --bj-radius-lg: 26px;
  --bj-radius-md: 18px;
  --bj-gap: clamp(16px, 2.4vw, 28px);
  --bj-section-y: clamp(64px, 9vw, 132px);
  --bj-shadow-pop: 0 26px 70px -40px rgba(0, 0, 0, .95);
}

/* ----------------------------------------------------------
   2. 重置与基础排版
   ---------------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  background-color: var(--bj-space);
}

body {
  margin: 0;
  min-height: 100%;
  background-color: var(--bj-space);
  background-image:
    radial-gradient(58% 40% at 10% -8%, rgba(123, 92, 255, .20), transparent 62%),
    radial-gradient(48% 34% at 94% 0%, rgba(46, 211, 183, .13), transparent 60%),
    radial-gradient(40% 30% at 50% 120%, rgba(255, 107, 53, .10), transparent 62%);
  background-repeat: no-repeat;
  color: var(--bj-white);
  font-family: var(--bj-font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 .6em;
  font-family: var(--bj-font-display);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--bj-white);
}

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

ul, ol { margin: 0 0 1em; padding-left: 1.2em; }
li { margin: 0; }

a { color: var(--bj-teal); text-decoration: none; }
a:hover { color: var(--bj-white); }

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

img, video { height: auto; display: block; }

button { font: inherit; }

::selection { background: var(--bj-purple); color: #fff; }

:focus-visible {
  outline: 2px solid var(--bj-teal);
  outline-offset: 3px;
  border-radius: 6px;
}

#main-content { scroll-margin-top: 104px; }

.bj-visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ----------------------------------------------------------
   3. 版心与区块节奏
   ---------------------------------------------------------- */
.bj-shell {
  width: min(100% - 2.4rem, var(--bj-shell));
  margin-inline: auto;
}

.bj-section { margin-block: var(--bj-section-y); }
.bj-section:first-child { margin-top: clamp(28px, 5vw, 64px); }

.bj-main {
  display: block;
  padding-top: clamp(24px, 4vw, 56px);
}

.bj-measure { max-width: var(--bj-measure); }

.bj-display {
  margin: 0 0 .5em;
  font-family: var(--bj-font-display);
  font-size: clamp(2.4rem, 6.4vw, 4.5rem);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -.035em;
  color: var(--bj-white);
  text-shadow: 0 0 30px rgba(123, 92, 255, .45), 0 0 90px rgba(123, 92, 255, .18);
}

.bj-h2 {
  margin: 0 0 .55em;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -.02em;
}

.bj-h3 {
  margin: 0 0 .5em;
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  font-weight: 800;
}

.bj-lead {
  max-width: var(--bj-measure);
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  line-height: 1.85;
  color: rgba(238, 242, 255, .86);
}

.bj-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  margin: 0 0 1rem;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .3em;
  color: var(--bj-purple-soft);
}

.bj-eyebrow::before {
  content: "";
  width: 34px;
  height: 1px;
  background: currentColor;
  opacity: .8;
}

.bj-vertical-note {
  writing-mode: vertical-rl;
  font-size: 11px;
  letter-spacing: .36em;
  color: var(--bj-slate);
  text-transform: uppercase;
}

.bj-tag {
  display: inline-flex;
  align-items: center;
  gap: .45em;
  padding: .34em .85em;
  border: 1px solid rgba(46, 211, 183, .38);
  border-radius: var(--bj-radius-pill);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--bj-teal);
  background: rgba(46, 211, 183, .07);
}

/* ----------------------------------------------------------
   4. 按钮与链接
   ---------------------------------------------------------- */
.bj-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5em;
  padding: .85em 1.5em;
  border: 1px solid transparent;
  border-radius: var(--bj-radius-pill);
  font-family: var(--bj-font-display);
  font-size: .95rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: .01em;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color .22s ease, color .22s ease,
    border-color .22s ease, box-shadow .28s ease, transform .18s ease;
}

.bj-btn--accent {
  background: var(--bj-orange);
  color: #17091F;
  box-shadow: 0 12px 32px -18px rgba(255, 107, 53, .95);
}
.bj-btn--accent:hover {
  color: #17091F;
  transform: translateY(-1px);
  box-shadow: 0 0 0 5px rgba(255, 107, 53, .16),
    0 18px 40px -18px rgba(255, 107, 53, 1);
}

.bj-btn--ghost {
  background: rgba(123, 92, 255, .12);
  color: var(--bj-white);
  border-color: var(--bj-line-strong);
}
.bj-btn--ghost:hover {
  background: rgba(123, 92, 255, .26);
  border-color: var(--bj-purple-soft);
  color: #fff;
  box-shadow: 0 0 28px -8px rgba(123, 92, 255, .95);
}

.bj-btn--paper {
  background: var(--bj-paper);
  color: var(--bj-on-paper);
}
.bj-btn--paper:hover {
  color: var(--bj-on-paper);
  box-shadow: 0 0 0 5px rgba(245, 239, 230, .16);
}

.bj-btn--slant {
  border-radius: 18px 5px 18px 5px;
  padding-inline: 1.9em;
}

.bj-btn--round {
  width: 3.6rem;
  height: 3.6rem;
  padding: 0;
  border-radius: 50%;
  flex-direction: column;
  gap: .1em;
  font-size: .72rem;
  line-height: 1.15;
  letter-spacing: .04em;
  text-align: center;
}

.bj-link-arrow {
  display: inline-flex;
  align-items: center;
  gap: .45em;
  padding-bottom: .18em;
  border-bottom: 1px solid rgba(46, 211, 183, .35);
  color: var(--bj-teal);
  font-weight: 700;
  transition: color .2s ease, border-color .2s ease;
}
.bj-link-arrow::after {
  content: "→";
  transition: transform .2s ease;
}
.bj-link-arrow:hover {
  color: #fff;
  border-color: #fff;
}
.bj-link-arrow:hover::after { transform: translateX(4px); }

/* ----------------------------------------------------------
   5. 展签卡 / 数据对 / 网格
   ---------------------------------------------------------- */
.bj-plate {
  position: relative;
  padding: clamp(20px, 3vw, 34px);
  border-radius: var(--bj-radius-lg);
  background: var(--bj-paper);
  color: var(--bj-on-paper);
  box-shadow: var(--bj-shadow-pop);
}
.bj-plate h2,
.bj-plate h3,
.bj-plate h4 { color: var(--bj-on-paper); }
.bj-plate p { color: #2A2F5200; color: #2A2F52; }
.bj-plate a { color: #4B32C3; }
.bj-plate a:hover { color: #10142C; }

.bj-plate__label {
  display: block;
  margin-bottom: .9rem;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .26em;
  color: #6B5A8F;
}

.bj-stat {
  display: flex;
  flex-direction: column;
  gap: .35rem;
}
.bj-stat__value {
  font-family: var(--bj-font-mono);
  font-size: clamp(1.9rem, 4.6vw, 3rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--bj-teal);
  text-shadow: 0 0 28px rgba(46, 211, 183, .45);
}
.bj-stat__label {
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--bj-slate);
}

.bj-grid {
  display: grid;
  gap: var(--bj-gap);
}
.bj-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.bj-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

@media (min-width: 901px) {
  .bj-grid--offset > *:nth-child(even) { transform: translateY(clamp(18px, 3vw, 52px)); }
}

/* ----------------------------------------------------------
   6. 视觉容器（页面阶段放置 SVG / 图片占位）
   ---------------------------------------------------------- */
.bj-media {
  position: relative;
  isolation: isolate;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--bj-line);
  border-radius: var(--bj-radius-lg);
  background:
    radial-gradient(120% 120% at 18% 0%, rgba(123, 92, 255, .38), transparent 62%),
    radial-gradient(110% 110% at 100% 100%, rgba(46, 211, 183, .22), transparent 58%),
    var(--bj-ink-2);
}
.bj-media::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(118deg, rgba(255, 255, 255, .08), transparent 44%);
  pointer-events: none;
  z-index: 2;
}
.bj-media > img,
.bj-media > svg,
.bj-media > picture {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.bj-media__inner {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
}
.bj-media__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 3;
  margin: 0;
  padding: .7rem 1rem;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--bj-white);
  background: linear-gradient(0deg, rgba(11, 16, 38, .92), transparent);
  width: 100%;
}
.bj-media--16x9 { aspect-ratio: 16 / 9; }
.bj-media--21x9 { aspect-ratio: 21 / 9; }
.bj-media--4x3  { aspect-ratio: 4 / 3; }
.bj-media--1x1  { aspect-ratio: 1 / 1; }
.bj-media--3x4  { aspect-ratio: 3 / 4; }

.bj-glow {
  position: absolute;
  z-index: 0;
  width: clamp(200px, 28vw, 420px);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(64px);
  opacity: .5;
}
.bj-glow--purple { background: radial-gradient(circle, rgba(123, 92, 255, .95), transparent 70%); }
.bj-glow--teal   { background: radial-gradient(circle, rgba(46, 211, 183, .8), transparent 70%); }
.bj-glow--orange { background: radial-gradient(circle, rgba(255, 107, 53, .75), transparent 70%); }

/* ----------------------------------------------------------
   7. 面包屑
   ---------------------------------------------------------- */
.bj-breadcrumb {
  margin-bottom: clamp(18px, 3vw, 30px);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--bj-slate);
}
.bj-breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.bj-breadcrumb__list li + li::before {
  content: "/";
  margin-right: .5rem;
  color: rgba(138, 147, 184, .5);
}
.bj-breadcrumb a {
  color: var(--bj-slate);
}
.bj-breadcrumb a:hover { color: var(--bj-teal); }

/* ----------------------------------------------------------
   8. 页头 · 悬浮胶囊导航
   ---------------------------------------------------------- */
.bj-header {
  position: sticky;
  top: 0;
  z-index: 90;
  padding: .7rem 0;
}

.bj-skip {
  position: absolute;
  left: 50%;
  top: .5rem;
  z-index: 200;
  padding: .7em 1.3em;
  border-radius: var(--bj-radius-pill);
  background: var(--bj-teal);
  color: #04121A;
  font-weight: 800;
  font-size: .9rem;
  transform: translate(-50%, -220%);
  transition: transform .2s ease;
}
.bj-skip:focus {
  transform: translate(-50%, 0);
  color: #04121A;
}

.bj-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 120;
  width: 0;
  height: 3px;
  pointer-events: none;
  background: linear-gradient(90deg, var(--bj-teal), var(--bj-purple) 55%, var(--bj-orange));
  box-shadow: 0 0 16px rgba(123, 92, 255, .85);
  transition: width .12s linear;
}

.bj-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: .5rem;
  width: min(100% - 1.6rem, 1320px);
  margin-inline: auto;
  padding: .45rem;
  border: 1px solid var(--bj-line);
  border-radius: var(--bj-radius-pill);
  background: var(--bj-glass);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  backdrop-filter: blur(18px) saturate(150%);
  box-shadow: 0 22px 60px -42px rgba(0, 0, 0, 1);
}

/* 品牌浮岛 */
.bj-brand {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  flex: 0 0 auto;
  padding: .32rem .9rem .32rem .38rem;
  border: 1px solid var(--bj-line);
  border-radius: var(--bj-radius-pill);
  background: linear-gradient(120deg, rgba(123, 92, 255, .3), rgba(46, 211, 183, .14));
  color: var(--bj-white);
  text-decoration: none;
  transition: border-color .25s ease, box-shadow .28s ease;
}
.bj-brand:hover {
  color: var(--bj-white);
  border-color: var(--bj-purple-soft);
  box-shadow: 0 0 28px -8px rgba(123, 92, 255, .95);
}
.bj-brand__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--bj-teal), var(--bj-purple-soft) 56%, var(--bj-orange));
  color: #0B1026;
  font-family: var(--bj-font-display);
  font-size: 1rem;
  font-weight: 900;
  box-shadow: 0 0 20px -4px rgba(123, 92, 255, .95);
}
.bj-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.bj-brand__name {
  font-family: var(--bj-font-display);
  font-size: .95rem;
  font-weight: 800;
  letter-spacing: .01em;
  white-space: nowrap;
}
.bj-brand__sub {
  font-size: 10px;
  letter-spacing: .22em;
  color: var(--bj-slate);
  white-space: nowrap;
}

/* 栏目胶囊 */
.bj-nav {
  margin-inline: auto;
  padding: .28rem;
  border: 1px solid var(--bj-line);
  border-radius: var(--bj-radius-pill);
  background: rgba(11, 16, 38, .6);
}
.bj-nav__list {
  display: flex;
  align-items: center;
  gap: .12rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.bj-nav__link {
  display: inline-block;
  padding: .6em 1em;
  border-radius: var(--bj-radius-pill);
  color: rgba(238, 242, 255, .78);
  font-size: .94rem;
  font-weight: 600;
  white-space: nowrap;
  transition: background-color .2s ease, color .2s ease, box-shadow .26s ease;
}
.bj-nav__link:hover {
  color: #fff;
  background: rgba(123, 92, 255, .2);
  box-shadow: inset 0 0 0 1px rgba(167, 139, 250, .45);
}
.bj-nav__link[aria-current="page"] {
  color: #061223;
  background: linear-gradient(120deg, var(--bj-teal), var(--bj-purple-soft));
  box-shadow: 0 10px 28px -14px rgba(46, 211, 183, .95);
}
.bj-nav__link[aria-current="page"]:hover {
  color: #061223;
}

/* 右侧动作 */
.bj-actions {
  display: flex;
  align-items: center;
  gap: .45rem;
  flex: 0 0 auto;
}
.bj-actions .bj-btn {
  padding: .78em 1.25em;
  font-size: .9rem;
}

/* 移动端菜单按钮 */
.bj-nav-toggle {
  display: none;
  align-items: center;
  gap: .55rem;
  margin-left: auto;
  padding: .62em 1em;
  border: 1px solid var(--bj-line-strong);
  border-radius: var(--bj-radius-pill);
  background: rgba(123, 92, 255, .16);
  color: var(--bj-white);
  font-size: .9rem;
  font-weight: 700;
  cursor: pointer;
  transition: background-color .2s ease, box-shadow .25s ease;
}
.bj-nav-toggle:hover { background: rgba(123, 92, 255, .28); }
.bj-nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}
.bj-nav-toggle__bars::before,
.bj-nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .22s ease;
}
.bj-nav-toggle__bars::before { top: -5px; }
.bj-nav-toggle__bars::after  { top: 5px; }
.bj-nav-toggle[aria-expanded="true"] .bj-nav-toggle__bars { background: transparent; }
.bj-nav-toggle[aria-expanded="true"] .bj-nav-toggle__bars::before {
  transform: translateY(5px) rotate(45deg);
}
.bj-nav-toggle[aria-expanded="true"] .bj-nav-toggle__bars::after {
  transform: translateY(-5px) rotate(-45deg);
}

/* ----------------------------------------------------------
   9. 小屏底部浮岛快捷栏
   ---------------------------------------------------------- */
.bj-mobilebar {
  display: none;
  position: fixed;
  left: 50%;
  bottom: calc(env(safe-area-inset-bottom, 0px) + 10px);
  z-index: 95;
  transform: translateX(-50%);
  padding: .34rem;
  border: 1px solid var(--bj-line-strong);
  border-radius: 22px;
  background: rgba(20, 26, 58, .92);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  backdrop-filter: blur(16px) saturate(150%);
  box-shadow: 0 22px 48px -22px rgba(0, 0, 0, .95);
}
.bj-mobilebar__list {
  display: flex;
  align-items: stretch;
  gap: .1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.bj-mobilebar__link {
  display: block;
  padding: .55em .78em;
  border-radius: 16px;
  color: rgba(238, 242, 255, .8);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .06em;
  white-space: nowrap;
  transition: background-color .2s ease, color .2s ease;
}
.bj-mobilebar__link:hover,
.bj-mobilebar__link[aria-current="page"] {
  color: #061223;
  background: linear-gradient(120deg, var(--bj-teal), var(--bj-purple-soft));
}

/* ----------------------------------------------------------
   10. 页脚
   ---------------------------------------------------------- */
.bj-footer {
  position: relative;
  margin-top: clamp(72px, 11vw, 148px);
  padding: clamp(48px, 7vw, 88px) 0 clamp(48px, 6vw, 76px);
  border-top: 1px solid var(--bj-line);
  background:
    radial-gradient(90% 130% at 6% 0%, rgba(123, 92, 255, .28), transparent 62%),
    radial-gradient(72% 100% at 96% 4%, rgba(46, 211, 183, .16), transparent 64%),
    var(--bj-ink);
  color: var(--bj-white);
  overflow: hidden;
}
.bj-footer__inner { position: relative; z-index: 1; }

.bj-footer__top {
  display: grid;
  grid-template-columns: minmax(230px, 1fr) 2.3fr;
  gap: clamp(28px, 4vw, 64px);
  padding-bottom: clamp(28px, 4vw, 52px);
  border-bottom: 1px solid var(--bj-line);
}

.bj-footer__brand {
  display: flex;
  flex-direction: column;
  gap: .45rem;
}
.bj-footer__brandname {
  margin: 0;
  font-family: var(--bj-font-display);
  font-size: 1.3rem;
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--bj-white);
}
.bj-footer__brandsub {
  margin: 0;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--bj-purple-soft);
}
.bj-footer__brandnote {
  max-width: 30ch;
  margin: .4rem 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--bj-slate);
}

.bj-footer__grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(20px, 2.6vw, 40px);
}

.bj-footer__col { min-width: 0; }

.bj-footer__title {
  margin: 0 0 .9rem;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .26em;
  color: var(--bj-purple-soft);
}

.bj-footer__list {
  margin: 0 0 .8rem;
  padding: 0;
  list-style: none;
}
.bj-footer__list li { margin-bottom: .42rem; }

.bj-footer__link {
  display: inline-block;
  color: rgba(238, 242, 255, .82);
  font-size: 14px;
  text-decoration: none;
  transition: color .2s ease, transform .2s ease;
}
.bj-footer__link:hover {
  color: var(--bj-orange);
  transform: translateX(3px);
}

.bj-footer__text {
  margin: 0 0 .42rem;
  font-size: 13px;
  line-height: 1.75;
  color: var(--bj-slate);
  word-break: break-word;
}

.bj-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem 1.6rem;
  align-items: center;
  justify-content: space-between;
  padding-top: clamp(20px, 3vw, 32px);
}
.bj-footer__legal {
  margin: 0;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--bj-slate);
}

/* 回到顶部 */
.bj-totop {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 100;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border: 1px solid var(--bj-line-strong);
  border-radius: 50%;
  background: rgba(20, 26, 58, .92);
  color: var(--bj-white);
  font-size: 1.1rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .25s ease, transform .25s ease, visibility .25s ease,
    box-shadow .25s ease, border-color .25s ease;
}
.bj-totop[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: none;
}
.bj-totop:hover {
  border-color: var(--bj-teal);
  box-shadow: 0 0 26px -8px rgba(46, 211, 183, .95);
}

/* ----------------------------------------------------------
   11. 滚动显现协议
   ---------------------------------------------------------- */
html.bj-js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .6s ease, transform .6s ease;
}
html.bj-js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ----------------------------------------------------------
   12. 响应式
   ---------------------------------------------------------- */
@media (max-width: 1180px) {
  .bj-nav__link { padding: .55em .78em; font-size: .9rem; }
  .bj-actions .bj-btn { padding: .72em 1.05em; font-size: .86rem; }
}

@media (max-width: 1024px) {
  .bj-brand__sub { display: none; }
  .bj-footer__top { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .bj-shell { width: min(100% - 1.8rem, var(--bj-shell)); }

  .bj-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .bj-grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 899px) {
  body { padding-bottom: 92px; }

  .bj-actions { display: none; }
  .bj-nav-toggle { display: inline-flex; }

  .bj-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 10px);
    display: none;
    margin: 0;
    padding: .7rem;
    border-radius: 24px;
    border-color: var(--bj-line-strong);
    background: rgba(11, 16, 38, .97);
    box-shadow: 0 32px 64px -34px rgba(0, 0, 0, 1);
  }
  .bj-nav[data-open] {
    display: block;
    animation: bj-panel-in .22s ease both;
  }
  .bj-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: .18rem;
  }
  .bj-nav__link {
    display: block;
    padding: .85em 1.05em;
    font-size: 1rem;
    border-radius: 16px;
  }

  .bj-mobilebar { display: block; }

  .bj-totop {
    bottom: calc(env(safe-area-inset-bottom, 0px) + 96px);
  }

  .bj-plate { border-radius: 20px; }
}

@media (max-width: 600px) {
  body { font-size: 16px; }
  .bj-shell { width: min(100% - 1.5rem, var(--bj-shell)); }
  .bj-brand__mark { width: 30px; height: 30px; border-radius: 10px; font-size: .92rem; }
  .bj-brand__name { font-size: .88rem; }
  .bj-nav-toggle { padding: .58em .85em; }
  .bj-nav-toggle__label { display: none; }
  .bj-grid--2,
  .bj-grid--3 { grid-template-columns: 1fr; }
  .bj-footer__grid { grid-template-columns: 1fr; }
  .bj-footer__bottom { justify-content: flex-start; }
}

@media (max-width: 380px) {
  .bj-mobilebar__link { padding: .5em .55em; font-size: 10px; }
}

@keyframes bj-panel-in {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: none; }
}

/* ----------------------------------------------------------
   13. 降低动态效果
   ---------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    transition-delay: 0ms !important;
  }

  html.bj-js [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .bj-totop { transition: none; }
}