/* 基础 */
:root {
  --bg: #061a2b;
  --bg-alt: #081f33;
  --card: #0b2a45;
  --text: #e6f1ff;
  --muted: #b7c2d0;
  --brand: #1fb6ff;
  --brand-2: #00d1b2;
  --warning: #ffce3a;
  --danger: #ff5a5f;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Noto Sans SC', system-ui, -apple-system, Segoe UI, Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--text);
  background: radial-gradient(80% 80% at 50% 20%, #0f3555 0%, #061a2b 50%, #041521 100%);
}

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

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

/* 头部导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(6, 26, 43, 0.8);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 900;
  letter-spacing: .5px;
}
.brand__logo { font-size: 20px; }
.brand__text { font-size: 18px; }

.nav__toggle {
  display: none;
  background: transparent;
  color: var(--text);
  font-size: 22px;
  border: 0;
}
.nav__menu { display: flex; align-items: center; gap: 20px; }
.nav__menu a { opacity: .85; transition: opacity .2s ease; }
.nav__menu a:hover { opacity: 1; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 18px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #001a2d;
  font-weight: 700;
  border-radius: 12px;
  box-shadow: var(--shadow);
}
.btn--small { padding: 8px 12px; border-radius: 10px; font-weight: 700; }
.btn--ghost { background: transparent; color: var(--text); border: 1px solid rgba(255,255,255,.2); box-shadow: none; }

/* 英雄区 */
.hero {
  position: relative;
  padding: 80px 0 60px;
}
.hero__content {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 32px;
  align-items: center;
}
.hero__text h1 {
  margin: 0 0 12px;
  font-size: clamp(28px, 4vw, 48px);
}
.hero__text p { margin: 0 0 20px; color: var(--muted); }
.hero__cta { display: flex; gap: 12px; flex-wrap: wrap; }
/* 搜索栏与标签 */
.searchbar { margin: 16px 0 10px; }
.searchbar input {
  width: 100%;
  padding: 14px 16px;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(0,0,0,.25);
  color: var(--text);
}
.searchbar input::placeholder { color: var(--muted); }
.tags { display: flex; gap: 10px; flex-wrap: wrap; margin: 6px 0 0; }
.tag {
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(13,32,51,.6);
  color: var(--text);
  font-weight: 600;
}
.tag.is-active { border-color: var(--brand); box-shadow: 0 0 0 2px rgba(31,182,255,.2) inset; }

.hero__art { height: 360px; position: relative; }
.island {
  position: absolute;
  inset: 0;
  border-radius: 20px;
  background:
    radial-gradient(120px 80px at 70% 30%, rgba(255,255,255,.15), transparent 60%),
    radial-gradient(140px 120px at 30% 70%, rgba(0,209,178,.2), transparent 60%),
    linear-gradient(180deg, #0e3557 0%, #0b2a45 50%, #082337 100%);
  box-shadow: var(--shadow);
}

/* 通用区块 */
.section { padding: 64px 0; }
.section--alt { background: linear-gradient(180deg, rgba(255,255,255,.02), rgba(255,255,255,.00)); }
.section--cta { background: linear-gradient(180deg, #0b2a45, #082337); }

.grid { display: grid; gap: 20px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--tools { grid-template-columns: repeat(3, 1fr); }

.card {
  background: var(--card);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: 16px;
  padding: 20px;
  box-shadow: var(--shadow);
}
.tool__head { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.tool__title { margin: 0 0 4px; font-size: 18px; }
.tool__desc { margin: 0; color: var(--muted); font-size: 14px; }
.tool__meta { display: flex; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
.badge { padding: 4px 8px; background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.08); border-radius: 999px; font-size: 12px; color: var(--muted); }
.fav { background: transparent; color: var(--warning); border: 0; font-size: 18px; }
.muted { color: var(--muted); }

/* 轮播 */
.carousel { position: relative; overflow: hidden; border-radius: 16px; }
.carousel__track { display: flex; transition: transform .6s cubic-bezier(.22,.61,.36,1); }
.carousel__btn {
  position: absolute; top: 50%; transform: translateY(-50%);
  background: rgba(0,0,0,.35); color: #fff; border: 0; width: 40px; height: 40px; border-radius: 999px;
}
.carousel__btn[data-dir="prev"] { left: 10px; }
.carousel__btn[data-dir="next"] { right: 10px; }

.shot { min-width: 100%; margin: 0; }
.shot__img { height: 320px; background-size: cover; background-position: center; }
.shot--1 { background-image: linear-gradient(135deg, #1fb6ff, #00d1b2); }
.shot--2 { background-image: linear-gradient(135deg, #ffce3a, #ff5a5f); }
.shot--3 { background-image: linear-gradient(135deg, #7f7cff, #1fb6ff); }
.shot figcaption { padding: 12px; color: var(--muted); font-size: 14px; text-align: center; background: rgba(0,0,0,.2); }

/* 视频 */
.video { margin-top: 24px; }
.video__embed { position: relative; padding-top: 56.25%; border-radius: 16px; overflow: hidden; box-shadow: var(--shadow); }
.video__embed iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

/* 新闻 */
.news { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.news li { display: grid; grid-template-columns: 120px 1fr; gap: 16px; align-items: center; padding: 14px 16px; background: var(--card); border-radius: 12px; }
.news time { color: var(--warning); font-weight: 700; }
.news a { color: var(--text); }

/* 社区 */
.social { text-align: center; font-weight: 700; }

/* 下载 */
.cta { text-align: center; }
.store { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 10px; }
.store__btn { padding: 12px 16px; background: #0d2033; border: 1px solid rgba(255,255,255,.1); border-radius: 12px; }

/* 页脚 */
.site-footer { padding: 40px 0; background: #051522; border-top: 1px solid rgba(255,255,255,.06); }
.footer__grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 20px; align-items: start; }
.footer__nav { display: grid; gap: 10px; justify-content: start; }
.brand--footer { margin-bottom: 6px; }
.legal { color: var(--muted); font-size: 14px; }

/* 返回顶部 */
.backtop { position: fixed; right: 18px; bottom: 18px; width: 44px; height: 44px; border-radius: 999px; display: grid; place-items: center; background: rgba(0,0,0,.4); color: #fff; box-shadow: var(--shadow); }

/* 响应式 */
@media (max-width: 960px) {
  .hero__content { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; }
  .grid--tools { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 760px) {
  .nav__toggle { display: inline-flex; }
  .nav__menu { position: fixed; inset: 64px 0 auto 0; background: rgba(6,26,43,.98); display: grid; gap: 12px; padding: 18px; transform: translateY(-120%); transition: transform .3s ease; }
  .nav__menu.is-open { transform: translateY(0); }
  .grid--3 { grid-template-columns: 1fr; }
  .news li { grid-template-columns: 1fr; gap: 8px; }
  .grid--tools { grid-template-columns: 1fr; }
}