/* ============================================================
 * style.css — 海龟交易策略实验室 v2
 * 现代金融工具风格 · 浅色主题 · 涨红跌绿
 * ============================================================ */
*{ margin:0; padding:0; box-sizing:border-box; }
:root{
  --bg:#f0f2f5; --card:#ffffff; --card-hover:#fafbfc;
  --text:#1a1a2e; --text2:#6b7280; --text3:#9ca3af;
  --border:#e5e7eb; --border2:#d1d5db;
  --accent:#2563eb; --accent-l:#dbeafe; --accent-d:#1d4ed8;
  --buy:#dc2626; --buy-bg:#fef2f2; --sell:#16a34a; --sell-bg:#f0fdf4;
  --price:#1e293b; --atr:#f59e0b; --bench:#94a3b8;
  --warn:#f59e0b; --warn-bg:#fffbeb;
  --shadow:0 1px 3px rgba(0,0,0,.06),0 1px 2px rgba(0,0,0,.04);
  --shadow-md:0 4px 6px rgba(0,0,0,.04),0 2px 4px rgba(0,0,0,.03);
  --shadow-lg:0 10px 15px rgba(0,0,0,.05),0 4px 6px rgba(0,0,0,.03);
  --r-sm:6px; --r-md:8px; --r-lg:12px; --r-xl:16px;
  --transition:.18s cubic-bezier(.4,0,.2,1);
}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg); color:var(--text); font-size:13px; line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
.app{ min-height:100vh; display:flex; flex-direction:column; }

/* ========== Header ========== */
header{
  height:56px; background:var(--card); border-bottom:1px solid var(--border);
  display:flex; align-items:center; padding:0 20px; gap:16px;
  position:sticky; top:0; z-index:100;
  box-shadow:var(--shadow);
}
.logo{ font-size:15px; font-weight:700; display:flex; align-items:center; gap:8px; white-space:nowrap; color:var(--text); }
.logo .icon{
  width:32px; height:32px; border-radius:var(--r-md);
  background:linear-gradient(135deg,var(--accent),var(--accent-d));
  color:#fff; display:flex; align-items:center; justify-content:center;
  font-size:16px; font-weight:700; box-shadow:0 2px 8px rgba(37,99,235,.3);
}
.tabs{ display:flex; gap:2px; background:var(--bg); padding:3px; border-radius:var(--r-md); }
.tab{
  padding:6px 14px; border-radius:var(--r-sm); cursor:pointer; font-size:13px;
  color:var(--text2); border:none; background:transparent; transition:var(--transition);
  font-weight:500;
}
.tab:hover{ color:var(--text); background:rgba(255,255,255,.6); }
.tab.active{ background:var(--card); color:var(--accent); box-shadow:var(--shadow); }
.spacer{ flex:1; }
.header-info{ font-size:12px; color:var(--text3); display:flex; align-items:center; gap:8px; }
.header-info .dot{ width:6px; height:6px; border-radius:50%; background:var(--sell); animation:pulse 2s infinite; }
@keyframes pulse{ 0%,100%{opacity:1} 50%{opacity:.4} }

/* ========== Body Layout ========== */
.body{ display:flex; flex:1; }

/* ========== Sidebar ========== */
aside{
  width:280px; background:var(--card); border-right:1px solid var(--border);
  padding:16px 14px; flex-shrink:0;
  height:calc(100vh - 56px); overflow-y:auto;
  position:sticky; top:56px;
}
aside::-webkit-scrollbar{ width:4px; }
aside::-webkit-scrollbar-thumb{ background:var(--border2); border-radius:2px; }
aside::-webkit-scrollbar-track{ background:transparent; }

.panel-title{
  font-size:11px; color:var(--text3); font-weight:600;
  text-transform:uppercase; letter-spacing:.8px;
  margin:16px 0 8px; padding-left:2px;
}
.panel-title:first-child{ margin-top:0; }

/* Stock search dropdown */
.stock-search-wrap{ position:relative; }
.stock-search-box{
  display:flex; align-items:center; gap:6px;
  padding:8px 10px; border:1px solid var(--border); border-radius:var(--r-md);
  background:var(--card); cursor:pointer; transition:var(--transition);
}
.stock-search-box:hover{ border-color:var(--border2); }
.stock-search-box.focus{
  border-color:var(--accent); box-shadow:0 0 0 3px var(--accent-l);
}
.search-icon{ color:var(--text3); flex-shrink:0; }
.stock-search-input{
  flex:1; border:none; outline:none; background:transparent;
  font-size:13px; color:var(--text); font-family:inherit;
}
.stock-search-input::placeholder{ color:var(--text3); }
.search-arrow{
  color:var(--text3); flex-shrink:0; transition:transform .2s;
}
.stock-search-box.open .search-arrow{ transform:rotate(180deg); }

.stock-dropdown{
  position:absolute; top:calc(100% + 4px); left:0; right:0;
  background:var(--card); border:1px solid var(--border); border-radius:var(--r-md);
  box-shadow:var(--shadow-lg); max-height:280px; overflow-y:auto;
  z-index:50; display:none; animation:dropdownIn .15s ease-out;
}
.stock-dropdown.show{ display:block; }
.stock-dropdown::-webkit-scrollbar{ width:4px; }
.stock-dropdown::-webkit-scrollbar-thumb{ background:var(--border2); border-radius:2px; }

@keyframes dropdownIn{
  from{ opacity:0; transform:translateY(-4px); }
  to{ opacity:1; transform:translateY(0); }
}

.dropdown-item{
  display:flex; align-items:center; justify-content:space-between;
  padding:9px 12px; cursor:pointer; transition:var(--transition);
  border-bottom:1px solid #f3f4f6;
}
.dropdown-item:last-child{ border-bottom:none; }
.dropdown-item:hover{ background:var(--accent-l); }
.dropdown-item.active{ background:var(--accent-l); }
.dropdown-item.active .di-name{ color:var(--accent); }
.dropdown-item .di-left{ display:flex; flex-direction:column; gap:1px; }
.dropdown-item .di-name{ font-size:13px; font-weight:600; color:var(--text); }
.dropdown-item .di-ind{ font-size:10px; color:var(--text3); }
.dropdown-item .di-code{ font-size:11px; color:var(--text3); font-family:monospace; }
.dropdown-item .di-check{ color:var(--accent); font-size:14px; display:none; }
.dropdown-item.active .di-check{ display:block; }

.dropdown-empty{
  padding:16px; text-align:center; font-size:12px; color:var(--text3);
}

/* Selected stock info bar */
.stock-selected-info{
  display:flex; align-items:center; justify-content:space-between;
  padding:8px 12px; margin-top:6px; border-radius:var(--r-md);
  background:var(--accent-l); border:1px solid rgba(37,99,235,.12);
}
.stock-selected-info .ssi-name{ font-size:13px; font-weight:700; color:var(--accent); }
.stock-selected-info .ssi-meta{ font-size:11px; color:var(--text2); margin-top:1px; }
.stock-selected-info .ssi-price{ text-align:right; }
.stock-selected-info .ssi-price-val{ font-size:15px; font-weight:700; color:var(--text); }
.stock-selected-info .ssi-price-date{ font-size:10px; color:var(--text3); }

/* Period selector */
.period-presets{ display:flex; flex-wrap:wrap; gap:4px; margin-bottom:8px; }
.pp-btn{
  padding:5px 11px; border-radius:var(--r-sm); border:1px solid var(--border);
  background:var(--card); font-size:11px; cursor:pointer; color:var(--text2);
  transition:var(--transition); font-weight:500;
}
.pp-btn:hover{ border-color:var(--accent); color:var(--accent); }
.pp-btn.active{ background:var(--accent); color:#fff; border-color:var(--accent); }
.date-row{ display:flex; gap:6px; margin-bottom:4px; align-items:center; }
.date-row label{ font-size:11px; color:var(--text2); width:16px; font-weight:600; }
.date-row input{
  flex:1; padding:5px 8px; border:1px solid var(--border); border-radius:var(--r-sm);
  font-size:12px; color:var(--text); transition:var(--transition);
}
.date-row input:focus{ outline:none; border-color:var(--accent); box-shadow:0 0 0 3px var(--accent-l); }

/* Presets */
.preset-grid{ display:grid; grid-template-columns:1fr 1fr; gap:5px; }
.preset-btn{
  padding:8px 10px; border-radius:var(--r-md); border:1px solid var(--border);
  background:var(--card); font-size:11px; cursor:pointer; text-align:left;
  transition:var(--transition); line-height:1.4;
}
.preset-btn:hover{ border-color:var(--accent); box-shadow:var(--shadow); transform:translateY(-1px); }
.preset-btn.active{ background:var(--accent-l); border-color:var(--accent); }
.preset-btn .pn{ font-weight:700; color:var(--text); display:block; }
.preset-btn.active .pn{ color:var(--accent); }
.preset-btn .pd{ font-size:10px; color:var(--text3); font-family:monospace; }

/* Params */
.param{ margin-bottom:12px; }
.param-label{ display:flex; justify-content:space-between; align-items:center; margin-bottom:4px; }
.param-label .lbl{ font-size:12px; color:var(--text2); }
.param-label .val{ font-size:13px; font-weight:700; color:var(--text); }
input[type=range]{
  width:100%; accent-color:var(--accent); cursor:pointer; height:4px;
  -webkit-appearance:none; background:var(--border); border-radius:2px;
}
input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none; width:16px; height:16px; border-radius:50%;
  background:var(--accent); cursor:pointer; box-shadow:0 1px 4px rgba(37,99,235,.3);
  border:2px solid #fff;
}
input[type=range]::-moz-range-thumb{
  width:16px; height:16px; border-radius:50%; background:var(--accent);
  cursor:pointer; border:2px solid #fff;
}

/* Buttons */
.btn-row{ display:flex; gap:6px; margin-top:14px; }
.btn{
  flex:1; padding:10px; border-radius:var(--r-md); border:none;
  font-size:13px; font-weight:600; cursor:pointer; transition:var(--transition);
  display:flex; align-items:center; justify-content:center; gap:6px;
}
.btn-primary{ background:var(--accent); color:#fff; }
.btn-primary:hover{ background:var(--accent-d); box-shadow:0 4px 12px rgba(37,99,235,.3); transform:translateY(-1px); }
.btn-primary:active{ transform:translateY(0); }
.btn-ghost{ background:var(--card); color:var(--accent); border:1px solid var(--accent); }
.btn-ghost:hover{ background:var(--accent-l); }
.btn-sm{ padding:6px 14px; font-size:12px; flex:none; border-radius:var(--r-sm); }

/* ========== Main Content ========== */
main{ flex:1; padding:16px 20px; display:flex; flex-direction:column; gap:12px; min-width:0; }

.card{
  background:var(--card); border:1px solid var(--border); border-radius:var(--r-lg);
  padding:16px 18px; box-shadow:var(--shadow);
  transition:var(--transition);
}
.card:hover{ box-shadow:var(--shadow-md); }
.card-head{
  display:flex; align-items:center; justify-content:space-between;
  margin-bottom:12px; flex-wrap:wrap; gap:8px;
}
.card-title{ font-size:14px; font-weight:700; color:var(--text); }
.card-sub{ font-size:12px; color:var(--text3); margin-top:2px; }
.legend{ display:flex; gap:10px; font-size:11px; color:var(--text2); flex-wrap:wrap; }
.legend span{ display:flex; align-items:center; gap:4px; }
.legend i{ width:14px; height:3px; border-radius:2px; display:inline-block; }
.legend .dot{ width:8px; height:8px; border-radius:50%; }

/* Chart containers */
#mainChart{ width:100%; height:360px; }
#btChart{ width:100%; height:260px; }
#retChart{ width:100%; height:200px; }
#eqChart{ width:100%; height:220px; }
#distChart{ width:100%; height:180px; }

/* ========== Metrics Cards ========== */
.metrics{ display:grid; grid-template-columns:repeat(6,1fr); gap:10px; }
.metric{
  background:var(--card); border:1px solid var(--border); border-radius:var(--r-md);
  padding:12px 14px; box-shadow:var(--shadow); transition:var(--transition);
  position:relative; overflow:hidden;
}
.metric:hover{ box-shadow:var(--shadow-md); transform:translateY(-2px); }
.metric::before{
  content:''; position:absolute; left:0; top:0; bottom:0; width:3px;
  background:var(--border2);
}
.metric.pos::before{ background:var(--buy); }
.metric.neg::before{ background:var(--sell); }
.metric .m-label{ font-size:11px; color:var(--text3); margin-bottom:4px; font-weight:500; }
.metric .m-val{ font-size:22px; font-weight:700; line-height:1.2; letter-spacing:-.5px; }
.metric .m-sub{ font-size:11px; color:var(--text3); margin-top:2px; }
.pos{ color:var(--buy); } .neg{ color:var(--sell); } .neutral{ color:var(--text); }

/* ========== Two-col layout ========== */
.row-2{ display:grid; grid-template-columns:1.4fr 1fr; gap:12px; }
.row-2-eq{ display:grid; grid-template-columns:1fr 1fr; gap:12px; }

/* ========== Signal Eval ========== */
.eval-grid{ display:grid; grid-template-columns:1fr 1fr; gap:6px 16px; }
.eval-item{
  display:flex; justify-content:space-between; align-items:center;
  padding:7px 0; border-bottom:1px solid #f3f4f6; font-size:12px;
}
.eval-item .el{ color:var(--text2); }
.eval-item .ev{ font-weight:700; font-size:13px; }

/* Quality score bar */
.quality-bar{
  height:8px; background:var(--bg); border-radius:4px; overflow:hidden; margin-top:4px;
}
.quality-fill{
  height:100%; border-radius:4px; transition:width .6s cubic-bezier(.4,0,.2,1);
}

/* ========== Tables ========== */
.tbl-wrap{ max-height:260px; overflow-y:auto; border-radius:var(--r-sm); }
.tbl-wrap::-webkit-scrollbar{ width:5px; }
.tbl-wrap::-webkit-scrollbar-thumb{ background:var(--border2); border-radius:3px; }
table{ width:100%; border-collapse:collapse; font-size:12px; }
thead th{
  background:#f9fafb; padding:8px 10px; text-align:left; font-weight:600;
  color:var(--text2); position:sticky; top:0; z-index:1; white-space:nowrap;
  border-bottom:1px solid var(--border); font-size:11px; text-transform:uppercase; letter-spacing:.3px;
}
tbody td{ padding:7px 10px; border-bottom:1px solid #f3f4f6; }
tbody tr:hover{ background:var(--card-hover); }
tbody tr:last-child td{ border-bottom:none; }
.tag{ display:inline-block; padding:2px 8px; border-radius:4px; font-size:11px; font-weight:600; }
.tag-buy{ background:var(--buy-bg); color:var(--buy); }
.tag-sell{ background:var(--sell-bg); color:var(--sell); }
.tag-stop{ background:var(--warn-bg); color:var(--warn); }
.tag-channel{ background:var(--accent-l); color:var(--accent); }

/* Combo table highlight */
.combo-best{ background:var(--sell-bg) !important; }
.combo-best td:first-child::before{ content:'★ '; color:var(--warn); }

/* ========== Loading Overlay ========== */
.loading-overlay{
  position:fixed; top:0; left:0; right:0; bottom:0;
  background:rgba(255,255,255,.7); backdrop-filter:blur(4px);
  z-index:9999; display:flex; align-items:center; justify-content:center;
  opacity:0; pointer-events:none; transition:opacity .2s;
}
.loading-overlay.show{ opacity:1; pointer-events:auto; }
.spinner{
  width:40px; height:40px; border:3px solid var(--border);
  border-top-color:var(--accent); border-radius:50%;
  animation:spin .6s linear infinite;
}
@keyframes spin{ to{ transform:rotate(360deg); } }
.loading-text{ margin-left:12px; font-size:14px; font-weight:500; color:var(--text2); }

/* ========== Summary Panel ========== */
.summary-panel{
  background:linear-gradient(135deg,#f8fafc,#f1f5f9);
  border:1px solid var(--border); border-radius:var(--r-lg);
  padding:14px 18px; font-size:12px; color:var(--text2); line-height:1.8;
}
.summary-panel b{ color:var(--text); }
.summary-panel .highlight{ color:var(--accent); font-weight:600; }

/* ========== Footer ========== */
.foot{ text-align:center; color:var(--text3); font-size:11px; padding:6px 0 16px; }

/* ========== Responsive ========== */
@media(max-width:1200px){
  .metrics{ grid-template-columns:repeat(3,1fr); }
  .row-2,.row-2-eq{ grid-template-columns:1fr; }
}
@media(max-width:768px){
  .body{ flex-direction:column; }
  aside{ width:100%; height:auto; position:relative; top:0; }
  .metrics{ grid-template-columns:repeat(2,1fr); }
  .eval-grid{ grid-template-columns:1fr; }
  header{ flex-wrap:wrap; height:auto; padding:10px 16px; }
  .tabs{ order:3; width:100%; overflow-x:auto; }
}