/* ===================== 基础与变量 ===================== */
:root {
  --bg: #0b0f1a;
  --bg-alt: #10162a;
  --surface: #151c33;
  --surface-2: #1c2542;
  --text: #e8ecf5;
  --text-dim: #9aa6c2;
  --primary: #6c8cff;
  --primary-2: #9d6cff;
  --accent: #34e0c4;
  --border: rgba(255, 255, 255, 0.08);
  --radius: 16px;
  --maxw: 1140px;
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.45);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ===================== 按钮 ===================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .2s ease, background .2s ease;
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn--primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff;
  box-shadow: 0 10px 30px rgba(108, 140, 255, 0.35);
}
.btn--ghost { border-color: var(--border); color: var(--text); background: rgba(255,255,255,.03); }
.btn--ghost:hover { background: rgba(255,255,255,.08); }
.btn--soft { background: var(--surface-2); color: var(--text); border-color: var(--border); }
.btn--soft:hover { background: #243056; }

/* ===================== 导航 ===================== */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(11, 15, 26, 0.72);
  border-bottom: 1px solid var(--border);
}
.nav__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
}
.nav__brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; }
.nav__author { margin-left: 18px; font-size: 13px; color: var(--text-dim); white-space: nowrap; }
.nav__author a { color: var(--primary); font-weight: 600; transition: color .2s; }
.nav__author a:hover { color: var(--accent); }
.nav__logo { width: 34px; height: 34px; border-radius: 9px; }
.nav__links { display: flex; gap: 22px; margin-left: auto; font-size: 15px; color: var(--text-dim); align-items: center; }
.nav__links a { transition: color .2s; }
.nav__links a:hover { color: var(--text); }
.nav__cta { padding: 9px 18px; }
.nav__bili-mobile { display: none; }
.nav__burger {
  display: none; flex-direction: column; justify-content: center; gap: 5px;
  width: 42px; height: 42px; margin-left: auto;
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 10px; cursor: pointer;
}
.nav__burger span {
  display: block; width: 20px; height: 2px; margin: 0 auto; border-radius: 2px;
  background: var(--text); transition: transform .25s, opacity .25s;
}
.nav__burger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger.is-open span:nth-child(2) { opacity: 0; }
.nav__burger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 下拉菜单 */
.nav__dropdown { position: relative; }
.nav__dropbtn {
  display: inline-flex; align-items: center; gap: 6px;
  background: none; border: none; cursor: pointer;
  color: var(--text-dim); font-size: 15px; font-family: inherit;
  padding: 4px 0; transition: color .2s;
}
.nav__dropbtn:hover, .nav__dropdown:hover .nav__dropbtn { color: var(--text); }
.caret { font-size: 11px; transition: transform .2s; }
.nav__dropdown:hover .caret { transform: rotate(180deg); }
.nav__menu {
  position: absolute; top: calc(100% + 10px); right: 0; left: auto; transform: translateY(8px);
  min-width: 160px; padding: 8px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  box-shadow: var(--shadow);
  opacity: 0; visibility: hidden; transition: opacity .2s ease, transform .2s ease, visibility .2s;
}
.nav__dropdown:hover .nav__menu,
.nav__dropdown:focus-within .nav__menu,
.nav__dropdown.is-open .nav__menu {
  opacity: 1; visibility: visible; transform: translateY(0);
}
.nav__dropdown.is-open .caret { transform: rotate(180deg); }
.nav__menu a {
  display: block; padding: 9px 12px; border-radius: 8px;
  color: var(--text-dim); font-size: 14px; transition: background .2s, color .2s;
}
.nav__menu a:hover { background: var(--surface-2); color: var(--text); }

/* ===================== Hero ===================== */
.hero { position: relative; padding: 96px 24px 80px; text-align: center; overflow: hidden; }
.hero__bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(700px 360px at 20% 10%, rgba(108,140,255,.28), transparent 60%),
    radial-gradient(640px 340px at 85% 25%, rgba(157,108,255,.22), transparent 60%),
    radial-gradient(600px 300px at 50% 100%, rgba(52,224,196,.16), transparent 60%);
  filter: blur(8px);
}
.hero__inner { position: relative; max-width: 880px; margin: 0 auto; }
.hero__eyebrow {
  display: inline-block; letter-spacing: 2px; font-size: 13px; color: var(--accent);
  border: 1px solid rgba(52,224,196,.3); padding: 5px 14px; border-radius: 999px; margin-bottom: 22px;
}
.hero__title { font-size: clamp(34px, 6vw, 60px); line-height: 1.15; font-weight: 800; letter-spacing: -.5px; }
.grad {
  background: linear-gradient(120deg, var(--primary), var(--primary-2), var(--accent));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero__sub { margin: 22px auto 30px; max-width: 680px; color: var(--text-dim); font-size: 17px; }
.hero__sub strong { color: var(--text); }
.hero__actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-top: 44px; }
.hero__badges { margin-top: 34px; display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.badge {
  font-size: 13px; color: var(--text-dim);
  border: 1px solid var(--border); background: var(--surface);
  padding: 6px 14px; border-radius: 999px;
}

/* ===================== 通用 Section ===================== */
.section { padding: 84px 24px; }
.section--alt { background: var(--bg-alt); }
.section__head { max-width: var(--maxw); margin: 0 auto 48px; text-align: center; }
.section__head h2 { font-size: clamp(26px, 4vw, 38px); font-weight: 800; }
.section__head p { color: var(--text-dim); margin-top: 12px; font-size: 16px; }

/* ===================== 产品卡片 ===================== */
.cards {
  max-width: var(--maxw); margin: 0 auto;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px;
}
.cards--two { grid-template-columns: repeat(2, 1fr); max-width: 880px; }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 26px;
  display: flex; flex-direction: column;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.card:hover { transform: translateY(-6px); border-color: rgba(108,140,255,.5); box-shadow: var(--shadow); }
.card--feature { background: linear-gradient(160deg, var(--surface-2), var(--surface)); border-color: rgba(108,140,255,.35); }
.card__logo { width: 64px; height: 64px; border-radius: 14px; margin-bottom: 16px; object-fit: contain; background: #fff1; }
.card h3 { font-size: 21px; }
.card__tag { color: var(--accent); font-size: 13px; margin: 4px 0 12px; font-weight: 600; }
.card p { color: var(--text-dim); font-size: 15px; }
.card__list { list-style: none; margin: 16px 0 22px; display: grid; gap: 8px; }
.card__list li { position: relative; padding-left: 22px; font-size: 14px; color: var(--text-dim); }
.card__list li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 700; }
.card .btn { margin-top: auto; align-self: flex-start; }

/* ===================== 分栏布局 ===================== */
.split {
  max-width: var(--maxw); margin: 0 auto;
  display: grid; grid-template-columns: 1.1fr .9fr; gap: 56px; align-items: center;
}
.split--reverse .split__media { order: -1; }
.split__text .pill {
  display: inline-block; font-size: 13px; color: var(--primary);
  border: 1px solid rgba(108,140,255,.35); padding: 4px 12px; border-radius: 999px; margin-bottom: 14px;
}
.split__text h2 { font-size: clamp(26px, 4vw, 36px); font-weight: 800; }
.split__text .lead { font-size: 18px; color: var(--text); margin: 12px 0 16px; font-weight: 600; }
.split__text p { color: var(--text-dim); font-size: 16px; margin-bottom: 12px; }
.split__text strong { color: var(--text); }
.codeblock {
  background: #0a0e18; border: 1px solid var(--border); border-radius: 12px;
  padding: 16px 18px; font-family: "JetBrains Mono", "Consolas", monospace; font-size: 13.5px;
  color: #b9c6e8; overflow-x: auto; margin: 8px 0 20px; line-height: 1.6;
}
.feat { list-style: none; display: grid; gap: 12px; margin: 6px 0 22px; }
.feat li { position: relative; padding-left: 26px; color: var(--text-dim); font-size: 15.5px; }
.feat li::before { content: "▹"; position: absolute; left: 0; color: var(--primary-2); font-weight: 700; font-size: 18px; top: -1px; }
.split__media { display: flex; justify-content: center; }
.showcase {
  width: 100%; max-width: 340px; border-radius: 22px;
  background: linear-gradient(160deg, var(--surface-2), var(--surface));
  border: 1px solid var(--border); padding: 28px; box-shadow: var(--shadow);
}
.showcase--round { border-radius: 32px; max-width: 260px; }

/* ===================== 步骤 ===================== */
.steps { max-width: 880px; margin: 0 auto; display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.step {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 30px 26px; position: relative; overflow: hidden;
}
.step__title {
  position: relative; z-index: 1;
  font-size: 30px; font-weight: 800; margin-bottom: 12px;
  background: linear-gradient(120deg, var(--primary), var(--primary-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.step__watermark {
  position: absolute; top: 6px; right: 14px; z-index: 0;
  font-size: 110px; font-weight: 800; line-height: 1; pointer-events: none;
  color: #fff; opacity: .05; user-select: none;
}
.step p { position: relative; z-index: 1; color: var(--text-dim); font-size: 15px; }
.step code { background: var(--surface-2); padding: 1px 6px; border-radius: 6px; font-size: 13px; }
.step__list { position: relative; z-index: 1; list-style: none; display: grid; gap: 8px; margin-top: 12px; }
.step__list li { position: relative; padding-left: 24px; color: var(--text-dim); font-size: 14px; }
.step__list li::before { content: "▹"; position: absolute; left: 0; color: var(--primary-2); font-weight: 700; }
.step__list strong { color: var(--text); }
.step__hint { position: relative; z-index: 1; font-size: 13px; color: var(--text-dim); opacity: .8; margin-top: 4px; }

/* ===================== 下载 ===================== */
.download { max-width: var(--maxw); margin: 0 auto; display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.download__tip {
  max-width: 760px; margin: 28px auto 0; padding: 12px 18px;
  text-align: center; color: #c7ecd2; font-size: 14px; font-weight: 600;
  border: 1px solid rgba(52, 224, 196, .35); border-radius: 10px;
  background: rgba(52, 224, 196, .08);
}
.dl {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 24px; display: flex; flex-direction: column; align-items: center; text-align: center; gap: 8px;
  transition: transform .2s ease, border-color .2s ease;
}
.dl:hover { transform: translateY(-5px); border-color: rgba(52,224,196,.5); }
.dl__icon { width: 60px; height: 60px; border-radius: 14px; margin-bottom: 6px; object-fit: contain; background: #fff1; }
.dl__name { font-weight: 700; font-size: 18px; }
.dl__meta { color: var(--text-dim); font-size: 13px; }
.dl__btn {
  margin-top: 10px; padding: 9px 20px; border-radius: 999px; font-size: 14px; font-weight: 600;
  background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff;
}
/* 下载分组（影现播放器：含两个平台按钮） */
.dl--group { gap: 12px; }
.dl__platforms { display: flex; gap: 10px; margin-top: 4px; flex-wrap: wrap; justify-content: center; }
.dl__plat {
  padding: 8px 18px; border-radius: 999px; font-size: 13px; font-weight: 600;
  background: var(--surface-2); border: 1px solid var(--border); color: var(--text);
  transition: background .2s, border-color .2s;
}
.dl__plat:hover { background: #243056; border-color: rgba(108,140,255,.5); }

/* ===================== 影现播放器子区块 ===================== */
.sub { padding: 16px 0; }
.sub--alt { background: var(--bg-alt); border-radius: var(--radius); padding: 36px 24px; margin-top: 8px; }

/* ===================== FAQ ===================== */
.faq { max-width: 820px; margin: 0 auto; display: grid; gap: 12px; }
.faq__item {
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 4px 20px;
}
.faq__item summary { cursor: pointer; font-weight: 600; padding: 16px 0; list-style: none; position: relative; }
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary::after { content: "+"; position: absolute; right: 0; color: var(--primary); font-size: 22px; font-weight: 700; }
.faq__item[open] summary::after { content: "−"; }
.faq__item p { color: var(--text-dim); padding: 0 0 18px; font-size: 15px; }
.faq__item code { background: var(--surface-2); padding: 1px 6px; border-radius: 6px; font-size: 13px; }
.faq__item .faq__warn {
  margin: 8px 0 18px; padding: 0;
  color: #f0d9a8; font-size: 14px; font-weight: 500; letter-spacing: .2px;
}

/* ===================== 页脚 ===================== */
.footer { background: #070a12; border-top: 1px solid var(--border); padding: 40px 24px; }
.footer__inner { max-width: var(--maxw); margin: 0 auto; display: flex; flex-direction: column; align-items: center; gap: 16px; text-align: center; }
.footer__brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.footer__logo { width: 30px; height: 30px; border-radius: 8px; }
.footer__links { display: flex; gap: 20px; flex-wrap: wrap; justify-content: center; color: var(--text-dim); font-size: 14px; }
.footer__links a:hover { color: var(--text); }
.footer__copy { color: var(--text-dim); font-size: 13px; }
.footer__copy a { color: var(--primary); font-weight: 600; transition: color .2s; }
.footer__copy a:hover { color: var(--accent); }
.footer__author { color: var(--text-dim); font-size: 14px; }
.footer__author a { color: var(--primary); font-weight: 600; transition: color .2s; }
.footer__author a:hover { color: var(--accent); }

/* 锚点跳转时为固定页眉留出空间 */
#yincang, #player-pc, #player-mobile, #how, #download { scroll-margin-top: 84px; }

/* ===================== 响应式 ===================== */
@media (max-width: 920px) {
  .cards, .cards--two, .steps, .download { grid-template-columns: 1fr; }
  .split, .split--reverse { grid-template-columns: 1fr; gap: 32px; }
  .split--reverse .split__media { order: 0; }
  .nav__author { display: none; }
  .nav__burger { display: flex; }
  .nav__links {
    position: absolute; top: calc(100% + 8px); right: 16px; left: 16px;
    flex-direction: column; align-items: stretch; gap: 4px;
    padding: 12px; margin-left: 0;
    background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
    box-shadow: var(--shadow);
    display: none;
  }
  .nav__links.is-open { display: flex; }
  .nav__links > a:not(.nav__bili-mobile) { padding: 10px 12px; border-radius: 8px; font-size: 15px; }
  .nav__links > a:not(.nav__bili-mobile):hover { background: var(--surface-2); color: var(--text); }
  .nav__bili-mobile {
    display: block; margin-top: 6px; padding: 10px 12px; border-radius: 8px;
    color: var(--primary); font-weight: 600; font-size: 15px;
    border-top: 1px solid var(--border);
  }
  .nav__dropdown { width: 100%; }
  .nav__dropbtn { width: 100%; justify-content: space-between; padding: 10px 12px; font-size: 15px; }
  .nav__menu {
    position: static; transform: none; opacity: 1; visibility: visible;
    box-shadow: none; border: none; background: transparent;
    padding: 0 0 4px 12px; min-width: 0;
    display: block;
  }
  .nav__menu a { padding: 8px 12px; }
}
@media (max-width: 560px) {
  .hero { padding: 64px 18px 56px; }
  .section { padding: 60px 18px; }
  .nav__cta { display: none; }
}