/* ================================================================
   工控产品导航 — 西门子风格深色专业界面（非官方，无商标）
   深色面板 · 资源卡片网格 · 响应式
   ================================================================ */
:root {
  --bg: #0a0f1a;
  --bg-panel: #0f1724;
  --bg-panel-hover: #141c2e;
  --accent: #22d3ee;        /* 西门子风格青色 */
  --accent-soft: rgba(34, 211, 238, 0.10);
  --accent-border: rgba(34, 211, 238, 0.30);
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --muted: #64748b;
  --border: rgba(255, 255, 255, 0.08);
  --radius: 10px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue",
    "Noto Sans SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  line-height: 1.5;
  min-height: 100vh;
  overflow-x: hidden;
}

/* 背景微网格 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    linear-gradient(rgba(34, 211, 238, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 211, 238, 0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  z-index: -2;
}

/* ===== 顶部导航 ===== */
.shell-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px) saturate(120%);
  background: rgba(10, 15, 26, 0.85);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.mark {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), #3b82f6);
  display: grid;
  place-items: center;
  font-size: 18px;
  box-shadow: 0 0 18px var(--accent-soft);
  border: 1px solid rgba(255, 255, 255, 0.1);
}
.brand-name {
  font-weight: 800;
  font-size: 17px;
  letter-spacing: 0.4px;
  background: linear-gradient(90deg, var(--text), #94a3b8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.brand-tag {
  font-size: 11px;
  color: var(--muted);
  margin-top: 1px;
}
.controls {
  display: flex;
  align-items: center;
  gap: 10px;
}
.search-wrap {
  position: relative;
  width: 210px;
}
.search-wrap input {
  width: 100%;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text);
  padding: 8px 10px 8px 34px;
  border-radius: 10px;
  font-size: 13px;
  outline: none;
  transition: border-color .2s, box-shadow .2s;
}
.search-wrap input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.search-icon {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 14px;
  color: var(--muted);
  pointer-events: none;
}
.btn-refresh {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  flex-shrink: 0;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--text-dim);
  padding: 7px 14px;
  border-radius: 10px;
  font-size: 13px;
  cursor: pointer;
  transition: all .2s;
}
.btn-refresh:hover {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 14px var(--accent-soft);
}
.btn-refresh:active { transform: translateY(1px); }
.btn-refresh.refreshing {
  color: var(--accent);
  border-color: var(--accent);
  animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== 分类芯片 ===== */
.shell-nav { border-bottom: 1px solid rgba(255, 255, 255, 0.05); }
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 10px 20px;
  overflow-x: auto;
  scrollbar-width: none;
}
.nav-inner::-webkit-scrollbar { display: none; }
.chip-list {
  display: flex;
  gap: 8px;
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(15, 23, 42, 0.5);
  color: var(--muted);
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  transition: all .2s;
  white-space: nowrap;
}
.chip:hover { border-color: var(--accent); color: var(--text); }
.chip.active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 16px var(--accent-soft);
}

/* ===== 主内容 ===== */
.shell-main { max-width: 1200px; margin: 0 auto; padding: 28px 20px 90px; }
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 10px;
}
.count-badge {
  font-size: 13px;
  color: var(--muted);
}
.count-badge strong { color: var(--accent); }
.view-toggle { display: flex; gap: 6px; }
.view-btn {
  width: 34px; height: 34px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(15, 23, 42, 0.5);
  color: var(--muted);
  font-size: 15px;
  cursor: pointer;
  transition: .2s;
}
.view-btn:hover { border-color: var(--accent); color: var(--accent); }
.view-btn.active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

/* 产品网格 */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 20px;
}
.grid.list { grid-template-columns: 1fr; }

/* 产品主卡片 */
.product-card {
  position: relative;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform .2s, border-color .2s, box-shadow .2s;
  display: flex;
  flex-direction: column;
}
.product-card:hover {
  border-color: var(--accent-border);
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

/* 顶部装饰条 */
.card-top {
  position: relative;
  padding: 18px 18px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.card-top::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}
.card-series {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 6px;
  display: block;
}
.card-name {
  font-size: 20px;
  font-weight: 800;
  color: var(--text);
  line-height: 1.2;
  margin-bottom: 4px;
}
.card-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 6px;
  background: rgba(34, 211, 238, 0.12);
  color: var(--accent);
  border: 1px solid rgba(34, 211, 238, 0.35);
  margin-top: 8px;
}
.card-badge .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}
.card-desc {
  font-size: 13px;
  color: var(--text-dim);
  margin-top: 10px;
  line-height: 1.5;
}

/* 资源链接区域 */
.link-group { padding: 14px 18px 18px; }
.link-group-title {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 12px;
  display: block;
  font-weight: 700;
}
.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px;
}

/* 单个资源卡片 */
.resource-card {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 6px;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(15, 23, 42, 0.4);
  text-decoration: none;
  color: var(--text);
  transition: all .2s;
  position: relative;
  overflow: hidden;
}
.resource-card::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0; width: 3px;
  transition: .2s;
}
.resource-card:hover {
  border-color: rgba(255, 255, 255, 0.18);
  background: rgba(20, 28, 46, 0.6);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}
.resource-card.sample:hover::before { background: #3b82f6; box-shadow: 0 0 12px rgba(59,130,246,0.4); }
.resource-card.manual:hover::before { background: #a78bfa; box-shadow: 0 0 12px rgba(167,139,250,0.4); }
.resource-card.software:hover::before { background: #4ade80; box-shadow: 0 0 12px rgba(74,222,128,0.4); }
.resource-card.firmware:hover::before { background: #fb7185; box-shadow: 0 0 12px rgba(251,113,133,0.4); }

.res-main {
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-decoration: none;
  color: inherit;
}
.res-ver-tag {
  font-size: 10.5px;
  font-weight: 700;
  color: var(--accent);
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.28);
  border-radius: 4px;
  padding: 0 5px;
  white-space: nowrap;
  line-height: 1.6;
}
.res-select {
  width: 100%;
  margin-top: 2px;
  padding: 3px 4px;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(2, 6, 23, 0.7);
  color: var(--text-dim);
  font-size: 10.5px;
  font-family: inherit;
  cursor: pointer;
  outline: none;
}
.res-select:hover,
.res-select:focus {
  border-color: var(--accent-border);
  color: var(--text);
}
.res-select option {
  background: #0b1424;
  color: var(--text);
}
.res-head {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
}
.res-type {
  font-size: 12.5px;
  font-weight: 800;
  white-space: nowrap;
}
.res-meta {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}
.res-date {
  font-size: 11px;
  color: var(--muted);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.res-label {
  font-size: 11px;
  line-height: 1.5;
  color: var(--text-dim);
}
.res-link {
  margin-left: auto;
  font-size: 16px;
  opacity: 0.6;
  transition: .2s;
}
.resource-card:hover .res-link { opacity: 1; color: var(--accent); }

/* 卡片底部元信息 */
.card-meta {
  margin-top: auto;
  padding: 12px 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 11.5px;
  color: var(--muted);
}
.card-updated { font-weight: 700; color: var(--text-dim); }

/* 空状态 */
.empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  color: var(--muted);
}

/* ===== 页脚免责声明 ===== */
.shell-footer {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(10, 15, 26, 0.9);
  backdrop-filter: blur(10px);
  padding: 32px 20px 40px;
  margin-top: 40px;
}
.footer-inner { max-width: 1200px; margin: 0 auto; display: flex; flex-direction: column; gap: 18px; }
.disclaimer {
  border: 1px solid rgba(244, 63, 94, 0.2);
  background: rgba(244, 63, 94, 0.05);
  border-radius: 10px;
  padding: 18px 20px;
}
.disclaimer h3 {
  color: #fb7185;
  font-size: 15px;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.disclaimer ul { list-style: none; padding-left: 2px; }
.disclaimer li {
  font-size: 12.5px;
  color: var(--text-dim);
  line-height: 1.6;
  margin-bottom: 7px;
  position: relative;
  padding-left: 16px;
}
.disclaimer li::before {
  content: "•";
  color: #fb7185;
  position: absolute;
  left: 0;
  font-weight: 800;
}
.footer-meta { color: var(--muted); font-size: 12px; line-height: 1.7; }
.footer-meta strong { color: var(--text-dim); }
.footer-meta code {
  color: var(--accent);
  background: rgba(34, 211, 238, 0.1);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 11.5px;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
}
.muted { color: var(--muted); }

/* ===== 响应式 ===== */
@media (max-width: 640px) {
  .header-inner { flex-direction: column; align-items: stretch; gap: 14px; }
  .brand { justify-content: center; }
  .controls { justify-content: center; width: 100%; gap: 8px; }
  .search-wrap { width: auto; flex: 1; min-width: 0; max-width: none; margin: 0; }
  .chip { font-size: 11.5px; padding: 5px 12px; }
  .product-card { padding: 0; }
  .card-name { font-size: 18px; }
  .resource-grid { grid-template-columns: 1fr; }
  .toolbar { flex-wrap: nowrap; align-items: center; }
  .view-toggle { margin-left: 0; }
  .shell-footer { padding: 24px 16px 32px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}