:root{
  --bg:#eef1f6; --bg2:#ffffff; --card:#ffffff; --card2:#eff3f9;
  --line:rgba(15,23,42,.09); --text:#101a30; --muted:#64748b; --muted2:#94a3b8;
  --brand:#2563eb; --brand2:#0891b2; --good:#16a34a; --warn:#f59e0b; --bad:#ef4444;
  --grad:linear-gradient(135deg,#2563eb 0%,#06b6d4 100%);
  --shadow:0 10px 28px rgba(15,23,42,.10);
  --r:18px; --sat:env(safe-area-inset-top); --sab:env(safe-area-inset-bottom);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro SC","PingFang SC","Helvetica Neue",Arial,sans-serif;
  background:radial-gradient(1200px 600px at 50% -10%,#dfe8fb 0%,var(--bg) 55%) fixed;
  color:var(--text); line-height:1.5; -webkit-font-smoothing:antialiased;
  overscroll-behavior-y:none;
}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
input,select{font-family:inherit;font-size:16px}
h1,h2,h3{margin:0;font-weight:700}
small{color:var(--muted)}

#app{max-width:520px;margin:0 auto;min-height:100vh;padding-bottom:calc(96px + var(--sab))}

/* 顶部栏 */
.topbar{position:sticky;top:0;z-index:20;padding-top:var(--sat);
  background:rgba(255,255,255,.72);backdrop-filter:saturate(160%) blur(18px);
  border-bottom:1px solid var(--line)}
.topbar-inner{display:flex;align-items:center;gap:12px;padding:10px 16px}
.veh-picker{flex:1;display:flex;align-items:center;gap:10px;padding:8px 12px;
  background:var(--card);border:1px solid var(--line);border-radius:14px}
.veh-icon{font-size:22px}
.veh-text{display:flex;flex-direction:column;align-items:flex-start;line-height:1.15;min-width:0}
.veh-text strong{font-size:16px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:60vw}
.veh-text small{font-size:12px}
.chev{margin-left:auto;color:var(--muted)}
.add-btn{width:44px;height:44px;border-radius:14px;background:var(--grad);
  font-size:26px;font-weight:300;color:#fff;box-shadow:var(--shadow);flex:none}

/* 视图 */
.view{display:none;padding:16px;animation:fade .25s ease}
.view.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
/* 仪表盘 hero */
.stat-hero{position:relative;overflow:hidden;border-radius:22px;padding:22px 20px;
  background:var(--grad);box-shadow:var(--shadow);margin-bottom:14px}
.stat-hero::after{content:"";position:absolute;right:-40px;top:-40px;width:180px;height:180px;
  background:radial-gradient(circle,rgba(255,255,255,.25),transparent 70%)}
.stat-hero .label{font-size:13px;opacity:.9;color:#eaf2ff}
.stat-hero .big{font-size:40px;font-weight:800;letter-spacing:-1px;margin:2px 0}
.stat-hero .big .unit{font-size:16px;font-weight:600;opacity:.85;margin-left:4px}
.stat-hero .row{display:flex;gap:20px;margin-top:12px}
.stat-hero .row div{font-size:13px;color:#eaf2ff}
.stat-hero .row b{display:block;font-size:18px;font-weight:700;margin-top:2px}

/* 统计网格 */
.stat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-bottom:14px}
.stat-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:14px 16px}
.stat-card .k{font-size:12px;color:var(--muted)}
.stat-card .v{font-size:22px;font-weight:700;margin-top:4px}
.stat-card .v span{font-size:13px;color:var(--muted);font-weight:500;margin-left:3px}

/* 卡片 */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  padding:16px;margin-bottom:14px}
.card-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:12px}
.card-head h3{font-size:15px}
.hint{font-size:12px;color:var(--muted2)}
.chart{width:100%;height:160px}
.chart svg{width:100%;height:100%;overflow:visible}
.chart .empty{display:flex;align-items:center;justify-content:center;height:100%;color:var(--muted2);font-size:13px}

/* 洞察 */
.insights{display:grid;gap:10px}
.insight{display:flex;align-items:center;gap:12px;background:var(--card);
  border:1px solid var(--line);border-radius:14px;padding:12px 14px}
.insight .emo{font-size:22px}
.insight .t{font-size:13px;color:var(--muted)}
.insight .d{font-size:15px;font-weight:600}
/* 记录列表 */
.record-list{display:flex;flex-direction:column;gap:10px}
.rec{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:14px 16px;
  display:flex;flex-direction:column;gap:8px;transition:transform .1s}
.rec:active{transform:scale(.985)}
.rec-top{display:flex;justify-content:space-between;align-items:flex-start;gap:10px}
.rec-date{font-size:15px;font-weight:600}
.rec-date small{display:block;font-size:12px;color:var(--muted);font-weight:400;margin-top:1px}
.rec-cons{text-align:right;flex:none}
.rec-cons b{font-size:20px;font-weight:800;color:var(--brand2)}
.rec-cons small{display:block;font-size:11px;color:var(--muted)}
.rec-cons.none b{color:var(--muted2);font-size:15px}
.rec-meta{display:flex;flex-wrap:wrap;gap:6px}
.chip{font-size:12px;padding:3px 9px;border-radius:999px;background:var(--card2);color:var(--muted)}
.chip.g{color:#0f9d58;background:rgba(22,163,74,.12)}
.chip.b{color:#2563eb;background:rgba(37,99,235,.12)}
.rec-note{font-size:12px;color:var(--muted2)}
.list-month{font-size:13px;color:var(--muted2);margin:14px 4px 2px;font-weight:600}
.empty-big{text-align:center;color:var(--muted2);padding:60px 20px}
.empty-big .e{font-size:44px}

/* 底部导航 */
.tabbar{position:fixed;left:0;right:0;bottom:0;z-index:20;max-width:520px;margin:0 auto;
  display:flex;align-items:center;justify-content:space-around;
  padding:8px 20px calc(8px + var(--sab));
  background:rgba(255,255,255,.82);backdrop-filter:saturate(160%) blur(18px);
  border-top:1px solid var(--line)}
.tab{display:flex;flex-direction:column;align-items:center;gap:2px;font-size:11px;color:var(--muted2);
  flex:1;padding:6px 0}
.tab span{font-size:20px}
.tab.active{color:var(--brand2)}
.tab-add{flex:none}
.tab-add-btn{display:flex;align-items:center;justify-content:center;width:52px;height:52px;
  border-radius:18px;background:var(--grad);color:#fff;font-size:30px;font-weight:300;
  box-shadow:0 8px 20px rgba(37,99,235,.5);margin-top:-18px}
/* 遮罩 + 底部弹出表单 */
.scrim{position:fixed;inset:0;background:rgba(0,0,0,.5);opacity:0;visibility:hidden;
  transition:opacity .25s;z-index:30;backdrop-filter:blur(2px)}
.scrim.show{opacity:1;visibility:visible}
.sheet{position:fixed;left:0;right:0;bottom:0;z-index:40;max-width:520px;margin:0 auto;
  background:var(--bg2);border-radius:24px 24px 0 0;border:1px solid var(--line);
  transform:translateY(110%);transition:transform .3s cubic-bezier(.22,1,.36,1);
  max-height:92vh;display:flex;flex-direction:column;padding-bottom:var(--sab)}
.sheet.show{transform:translateY(0)}
.sheet-handle{width:40px;height:5px;border-radius:3px;background:var(--muted2);opacity:.5;
  margin:10px auto 2px}
.sheet-head{display:flex;align-items:center;justify-content:space-between;padding:6px 18px 12px;
  border-bottom:1px solid var(--line)}
.sheet-head h2{font-size:17px}
.sheet-cancel{color:var(--muted);font-size:15px}
.sheet-save{color:var(--brand2);font-size:16px;font-weight:700}
.sheet-body{padding:16px 18px 24px;overflow-y:auto;-webkit-overflow-scrolling:touch}

/* 表单字段 */
.field-row{margin-bottom:14px}
.field-row.two{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.field-row.three{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px}
.field{display:flex;flex-direction:column;gap:6px}
.field>span{font-size:12px;color:var(--muted)}
.field input,.field select{background:var(--card);border:1px solid var(--line);border-radius:12px;
  padding:12px 12px;color:var(--text);width:100%;outline:none;transition:border-color .15s}
.field input:focus,.field select:focus{border-color:var(--brand)}
.tri-hint{font-size:12px;color:var(--brand2);background:rgba(6,182,212,.1);
  padding:8px 12px;border-radius:10px;margin:0 0 12px}

/* 开关 */
.switch-row{display:flex;align-items:center;justify-content:space-between;padding:12px 2px;margin-bottom:8px}
.switch-row span{font-size:15px}
.switch-row input{position:absolute;opacity:0}
.switch{width:50px;height:30px;border-radius:15px;background:var(--card2);position:relative;transition:background .2s;flex:none}
.switch::after{content:"";position:absolute;top:3px;left:3px;width:24px;height:24px;border-radius:50%;
  background:#fff;transition:transform .2s}
.switch-row input:checked+.switch{background:var(--good)}
.switch-row input:checked+.switch::after{transform:translateX(20px)}
/* 按钮 */
.btn-danger{width:100%;padding:13px;border-radius:12px;background:rgba(239,68,68,.12);
  color:#dc2626;font-weight:600;margin-top:8px}
.btn-ghost{width:100%;padding:13px;border-radius:12px;background:var(--card);
  border:1px dashed var(--line);color:var(--brand2);font-weight:600;margin-top:4px}

/* 车辆列表 */
.veh-list{display:flex;flex-direction:column;gap:8px;margin-bottom:16px}
.veh-item{display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:14px;
  background:var(--card);border:1px solid var(--line)}
.veh-item.active{border-color:var(--brand);background:var(--card2)}
.veh-item .ei{font-size:22px}
.veh-item .en{flex:1;min-width:0}
.veh-item .en b{font-size:15px}
.veh-item .en small{display:block;font-size:12px;color:var(--muted)}
.veh-item .edit{color:var(--muted);font-size:13px;padding:6px 10px;border-radius:10px;background:var(--card2)}

/* 图表元素 */
.chart .grid-line{stroke:var(--line);stroke-width:1}
.chart .axis-label{fill:var(--muted2);font-size:10px}
.chart .bar{fill:url(#gradBar)}
.chart .line{fill:none;stroke:url(#gradLine);stroke-width:2.5;stroke-linejoin:round;stroke-linecap:round}
.chart .area{fill:url(#gradArea)}
.chart .dot{fill:#fff;stroke:var(--brand2);stroke-width:2}
.chart .val-label{fill:var(--text);font-size:9px;text-anchor:middle;font-weight:600}

/* Toast */
.toast{position:fixed;left:50%;bottom:calc(110px + var(--sab));transform:translate(-50%,20px);
  background:rgba(17,24,39,.94);border:1px solid rgba(255,255,255,.12);color:#fff;
  padding:11px 18px;border-radius:12px;font-size:14px;z-index:60;opacity:0;visibility:hidden;
  transition:.25s;box-shadow:var(--shadow);max-width:88vw;text-align:center}
.toast.show{opacity:1;visibility:visible;transform:translate(-50%,0)}
.toast.err{border-color:rgba(239,68,68,.6)}

.loading{text-align:center;color:var(--muted2);padding:40px}

/* 期初累计折叠块 */
.init-block{background:var(--card);border:1px solid var(--line);border-radius:14px;
  padding:6px 14px;margin:4px 0 12px}
.init-block>summary{list-style:none;cursor:pointer;font-size:14px;font-weight:600;color:var(--brand2);
  padding:8px 0;display:flex;align-items:center;gap:6px}
.init-block>summary::-webkit-details-marker{display:none}
.init-block>summary::before{content:"⚙️";font-size:15px}
.init-block[open]>summary{border-bottom:1px solid var(--line);margin-bottom:10px}
.init-tip{font-size:12px;color:var(--muted);line-height:1.6;margin:0 0 12px}