/* ============================================================
   局域网答题文档站 · 视觉增强样式
   依赖：overrides/main.html（首页 Hero）、docs/index.md（卡片）
   ============================================================ */

:root {
  --tx-primary: #5b6ef5;
  --tx-accent:  #00c2ff;
  --tx-grad:    linear-gradient(135deg, #5b6ef5 0%, #8a5cf6 50%, #00c2ff 100%);
}

/* ---------- 首页 Hero 主视觉 ---------- */
.tx-hero {
  position: relative;
  margin: 0;
  padding: 5.5rem 1.25rem 6rem;
  color: #fff;
  text-align: center;
  overflow: hidden;
  isolation: isolate;
}
.tx-hero__bg {
  position: absolute;
  inset: -2px;
  z-index: -1;
  background:
    radial-gradient(40% 50% at 15% 20%, rgba(0,194,255,.55), transparent 60%),
    radial-gradient(45% 55% at 85% 25%, rgba(138,92,246,.55), transparent 60%),
    radial-gradient(50% 60% at 50% 95%, rgba(91,110,245,.50), transparent 60%),
    linear-gradient(135deg, #4b5af0 0%, #7b4ff0 50%, #00b4d2 100%);
  animation: txDrift 20s ease-in-out infinite alternate;
}
.tx-hero__bg::before,
.tx-hero__bg::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(40px);
  opacity: .55;
}
.tx-hero__bg::before {
  width: 320px; height: 320px;
  left: 8%; top: 10%;
  background: radial-gradient(circle, rgba(0,212,255,.9), transparent 70%);
  animation: txFloat 14s ease-in-out infinite alternate;
}
.tx-hero__bg::after {
  width: 360px; height: 360px;
  right: 6%; bottom: 0;
  background: radial-gradient(circle, rgba(168,85,247,.9), transparent 70%);
  animation: txFloat 18s ease-in-out infinite alternate-reverse;
}
@keyframes txFloat {
  from { transform: translate(0, 0); }
  to   { transform: translate(40px, -30px); }
}
@keyframes txDrift {
  from { transform: scale(1.03) translateY(0); }
  to   { transform: scale(1.10) translateY(-10px); }
}
.tx-hero__inner { position: relative; z-index: 1; max-width: 900px; margin: 0 auto; }
.tx-hero__badge {
  display: inline-block;
  padding: .35rem 1rem;
  margin-bottom: 1.4rem;
  font-size: .82rem;
  letter-spacing: .12em;
  border-radius: 999px;
  background: rgba(255,255,255,.14);
  border: 1px solid rgba(255,255,255,.35);
  backdrop-filter: blur(6px);
}
.tx-hero__title {
  font-size: clamp(2.2rem, 5.5vw, 3.9rem);
  font-weight: 800;
  letter-spacing: .01em;
  margin: 0 0 .9rem;
  text-shadow: 0 6px 34px rgba(0,0,0,.30);
}
.tx-hero__subtitle {
  font-size: clamp(1rem, 2.3vw, 1.32rem);
  line-height: 1.8;
  opacity: .95;
  margin: 0 auto 2.4rem;
  max-width: 680px;
}
.tx-hero__actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.tx-hero .md-button {
  border-radius: 999px;
  padding: .72rem 1.7rem;
  font-weight: 600;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.tx-hero .md-button--primary {
  background: #fff;
  color: #4b3bd6;
  box-shadow: 0 12px 32px rgba(0,0,0,.28);
}
.tx-hero .md-button--primary:hover { transform: translateY(-3px); box-shadow: 0 18px 44px rgba(0,0,0,.34); }
.tx-hero .md-button:not(.md-button--primary) {
  color: #fff;
  border: 1.5px solid rgba(255,255,255,.7);
  background: rgba(255,255,255,.08);
  backdrop-filter: blur(4px);
}
.tx-hero .md-button:not(.md-button--primary):hover {
  background: rgba(255,255,255,.18);
  transform: translateY(-3px);
}

/* ---------- 首页内容区块 ---------- */
.tx-section { margin-top: 3rem; }
.tx-section > h2 {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-size: 1.6rem;
}
.tx-section > h2::before {
  content: "";
  width: 6px;
  height: 1.5rem;
  border-radius: 4px;
  background: var(--tx-grad);
}

/* ---------- 卡片网格 ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin: 1.8rem 0 1rem;
}
.feature-card {
  display: block;
  text-decoration: none !important;
  color: var(--md-typeset-color);
  background: var(--md-default-bg-color);
  border: 1px solid rgba(125,125,150,.18);
  border-radius: 16px;
  padding: 1.6rem 1.4rem;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: "";
  position: absolute; left: 0; top: 0; right: 0; height: 4px;
  background: var(--tx-grad);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .3s ease;
}
.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 42px rgba(40,40,90,.16);
  border-color: transparent;
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-card__icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  display: grid; place-items: center;
  background: var(--tx-grad);
  color: #fff;
  margin-bottom: 1rem;
  box-shadow: 0 8px 22px rgba(91,110,245,.35);
}
.feature-card__icon svg { width: 26px; height: 26px; fill: currentColor; }
.feature-card h3 { margin: .2rem 0 .5rem; font-size: 1.16rem; }
.feature-card p { margin: 0; opacity: .78; line-height: 1.6; font-size: .95rem; }

/* ---------- 通用按钮美化 ---------- */
.md-content .md-button {
  border-radius: 999px;
  transition: transform .2s ease, box-shadow .2s ease;
}
.md-content .md-button--primary { background: var(--tx-grad); color: #fff; }
.md-content .md-button--primary:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(91,110,245,.4); }

/* ---------- 顶部进度条配色 ---------- */
.md-progress { background: var(--tx-grad); }

/* ---------- 选中与滚动条 ---------- */
::selection { background: rgba(91,110,245,.28); }
* { scrollbar-width: thin; scrollbar-color: rgba(125,125,150,.4) transparent; }
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-thumb { background: rgba(125,125,150,.4); border-radius: 8px; }
*::-webkit-scrollbar-thumb:hover { background: rgba(91,110,245,.6); }

/* ---------- 下载页卡片 ---------- */
.dl-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.4rem;
  margin: 2rem 0;
}
.dl-card {
  position: relative;
  border-radius: 18px;
  padding: 1.8rem 1.5rem;
  background: var(--md-default-bg-color);
  border: 1px solid rgba(125,125,150,.18);
  box-shadow: 0 10px 30px rgba(40,40,90,.08);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: transform .25s ease, box-shadow .25s ease;
}
.dl-card:hover { transform: translateY(-6px); box-shadow: 0 20px 46px rgba(40,40,90,.16); }
.dl-card__top { display: flex; align-items: center; gap: .9rem; margin-bottom: 1rem; }
.dl-card__icon {
  width: 54px; height: 54px; border-radius: 14px; flex: none;
  display: grid; place-items: center; color: #fff;
  background: var(--tx-grad); box-shadow: 0 8px 22px rgba(91,110,245,.35);
}
.dl-card__icon svg { width: 28px; height: 28px; fill: currentColor; }
.dl-card h3 { margin: 0; font-size: 1.2rem; }
.dl-card .dl-tag { font-size: .76rem; color: var(--tx-primary); font-weight: 600; letter-spacing: .08em; }
.dl-card p { margin: .2rem 0 1.4rem; opacity: .78; line-height: 1.6; flex: 1; }
.dl-card .dl-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .7rem 1.2rem; border-radius: 999px; font-weight: 600;
  text-decoration: none !important; color: #fff; background: var(--tx-grad);
  box-shadow: 0 8px 20px rgba(91,110,245,.35);
  transition: transform .2s ease, box-shadow .2s ease;
}
.dl-card .dl-btn:hover { transform: translateY(-2px); box-shadow: 0 14px 30px rgba(91,110,245,.45); }
.dl-card--soon::after {
  content: "待补充"; position: absolute; top: 14px; right: 14px;
  font-size: .7rem; padding: .25rem .65rem; border-radius: 999px;
  background: rgba(125,125,150,.15); color: #8a8a9a;
}

/* ---------- 暗色模式微调 ---------- */
[data-md-color-scheme="slate"] .feature-card {
  background: #1b1f2a;
  border-color: rgba(255,255,255,.08);
}
[data-md-color-scheme="slate"] .feature-card p { opacity: .7; }
[data-md-color-scheme="slate"] .dl-card { background: #1b1f2a; border-color: rgba(255,255,255,.08); }
[data-md-color-scheme="slate"] .dl-card p { opacity: .7; }