/* ==========================================================================
   投影之间 · Projection Lab — 美化主题
   设计语言：深邃海军蓝 × 青绿渐变 · 柔和分层阴影 · 大圆角卡片 · 细腻动效
   ========================================================================== */

:root{
  --ink:#152e3e;
  --navy:#16394e;
  --navy-deep:#0e2a3b;
  --muted:#7d8d97;
  --teal:#0f9a8d;
  --teal-bright:#14b8a6;
  --teal-soft:#5eead4;
  --line:#e3e9ee;
  --bg:#edf1f5;
  --orange:#d98e4a;
  --white:#fff;
  --font:"Segoe UI","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --grad-brand:linear-gradient(135deg,#0e2a3b 0%,#144860 52%,#0f7d76 100%);
  --grad-teal:linear-gradient(135deg,#14b8a6 0%,#0e9488 100%);
  --grad-card:linear-gradient(180deg,#ffffff 0%,#fbfdfd 100%);
  --shadow-sm:0 1px 2px rgba(14,42,59,.05),0 2px 8px rgba(14,42,59,.05);
  --shadow-md:0 4px 14px rgba(14,42,59,.09),0 1px 4px rgba(14,42,59,.05);
  --shadow-lg:0 14px 38px rgba(14,42,59,.16),0 3px 10px rgba(14,42,59,.07);
  --ring:0 0 0 3px rgba(20,184,166,.16);
  --ease:cubic-bezier(.22,.61,.36,1);
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  color:var(--ink);
  font-family:var(--font);
  font-size:13px;
  line-height:1.6;
  background:linear-gradient(180deg,#eff3f7 0%,#e9eef3 100%) fixed;
  -webkit-font-smoothing:antialiased;
}
::selection{background:#bfe8e0;color:#0e3a35}
button,input,textarea,select{font:inherit}
button,a,input,textarea,select{outline-offset:3px}
:focus-visible{outline:2px solid var(--teal-bright)}
button{cursor:pointer;transition:all .18s var(--ease)}
button:disabled{opacity:.5;cursor:wait}
a{color:var(--teal);text-decoration:none;transition:color .15s}
a:hover{color:#0b7c73}
button{color:inherit}
button,input,textarea,select{border:1px solid var(--line)}
button{background:var(--white)}
input,textarea,select{transition:border-color .15s,box-shadow .15s}
h1,h2,h3,p{margin:0}
h2{font-size:22px;font-weight:650;letter-spacing:-.5px}
h3{font-size:15px}

/* 细滚动条 */
*::-webkit-scrollbar{width:9px;height:9px}
*::-webkit-scrollbar-track{background:transparent}
*::-webkit-scrollbar-thumb{background:#c3d0d4;border-radius:8px;border:2px solid transparent;background-clip:content-box}
*::-webkit-scrollbar-thumb:hover{background:#a5b9be;border:2px solid transparent;background-clip:content-box}

/* --------------------------------------------------------------------------
   顶栏：深色渐变 + 品牌光效
   -------------------------------------------------------------------------- */
.topbar{
  height:78px;padding:0 36px;display:flex;align-items:center;gap:34px;
  background:var(--grad-brand);
  border-bottom:1px solid rgba(255,255,255,.08);
  box-shadow:0 2px 18px rgba(14,42,59,.28);
  position:relative;z-index:20;
}
.topbar::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg,transparent,rgba(94,234,212,.55),transparent)}
.brand{display:flex;align-items:center;gap:12px;color:#fff;min-width:220px;font-size:20px;font-weight:700;letter-spacing:2px;line-height:1.3}
.brand small{display:block;font-size:8px;letter-spacing:2.6px;font-weight:600;margin-top:4px;color:rgba(255,255,255,.55)}
.brand-icon{
  display:grid;place-items:center;width:38px;height:38px;border-radius:50%;
  background:rgba(94,234,212,.14);border:1px solid rgba(94,234,212,.4);
  color:var(--teal-soft);font-size:31px;font-family:serif;font-weight:400;
  box-shadow:0 0 14px rgba(20,184,166,.35),inset 0 0 8px rgba(94,234,212,.15);
}
.topbar nav{display:flex;gap:22px;height:100%}
.nav{border:0;background:transparent;padding:0 8px;color:rgba(255,255,255,.68);position:relative;font-weight:600;transition:color .18s}
.nav:hover{color:#fff}
.nav.active{color:#fff}
.nav.active:after{
  content:"";position:absolute;bottom:0;left:8px;right:8px;height:3px;border-radius:2px;
  background:var(--teal-soft);box-shadow:0 0 8px rgba(94,234,212,.8);
}
.course-badge{margin-left:auto;color:rgba(255,255,255,.55);font-size:11px;white-space:nowrap}
.course-badge i{display:inline-block;width:6px;height:6px;background:var(--teal-soft);border-radius:50%;margin-right:6px;box-shadow:0 0 6px rgba(94,234,212,.9)}

/* --------------------------------------------------------------------------
   按钮体系
   -------------------------------------------------------------------------- */
.button{
  border-radius:9px;padding:9px 15px;display:inline-flex;align-items:center;justify-content:center;gap:10px;
  font-size:12px;font-weight:600;line-height:1.4;white-space:nowrap;
  transition:all .18s var(--ease);
}
.button:active{transform:translateY(1px)}
.button.primary{
  background:var(--grad-teal);color:#fff;border:0;
  box-shadow:0 4px 14px rgba(15,154,141,.35),inset 0 1px 0 rgba(255,255,255,.2);
}
.button.primary:hover{box-shadow:0 7px 20px rgba(15,154,141,.45),inset 0 1px 0 rgba(255,255,255,.2);transform:translateY(-1px)}
.button.outline{background:#fff}
.button.outline:hover{border-color:#63bdb2;color:var(--teal);background:#f3faf8;box-shadow:var(--shadow-sm)}
.button.quiet{
  background:var(--grad-teal);border:0;color:#fff;
  box-shadow:0 3px 10px rgba(20,184,166,.4),inset 0 1px 0 rgba(255,255,255,.25);
}
.button.quiet:hover{box-shadow:0 6px 16px rgba(20,184,166,.55);transform:translateY(-1px)}
.button.small{padding:6px 11px;font-size:11px;border-radius:7px}
.wide{width:100%}

/* --------------------------------------------------------------------------
   Hero 区：深色渐变 + 经纬网纹理 + 装饰光环
   -------------------------------------------------------------------------- */
.intro{
  position:relative;overflow:hidden;
  display:flex;justify-content:space-between;align-items:center;
  margin:26px 36px 24px;padding:34px 42px;
  background:var(--grad-brand);
  background-image:
    radial-gradient(ellipse 60% 90% at 88% 10%,rgba(20,184,166,.35),transparent 55%),
    repeating-linear-gradient(0deg,rgba(255,255,255,.045) 0 1px,transparent 1px 52px),
    repeating-linear-gradient(90deg,rgba(255,255,255,.045) 0 1px,transparent 1px 52px),
    var(--grad-brand);
  border-radius:20px;color:#eef7f5;
  box-shadow:var(--shadow-lg);
}
.intro::before{content:"";position:absolute;width:340px;height:340px;border-radius:50%;
  border:1px solid rgba(255,255,255,.1);right:110px;top:-140px;
  box-shadow:0 0 0 34px rgba(255,255,255,.03),0 0 0 90px rgba(255,255,255,.02)}
.intro::after{content:"";position:absolute;width:340px;height:340px;border-radius:50%;
  border:1px dashed rgba(94,234,212,.28);right:110px;top:-140px;transform:scaleY(.42);transform-origin:center}
.eyebrow{font-size:9px;font-weight:650;letter-spacing:1.8px;color:#83949e;display:block}
.intro .eyebrow{color:rgba(94,234,212,.85)}
.intro h1{font-size:31px;font-weight:650;letter-spacing:1px;margin-top:8px;color:#fff}
.intro h1 span{color:var(--teal-soft)}
.intro p{color:rgba(238,247,245,.72);font-size:12.5px;margin-top:7px}
.intro-number{display:flex;align-items:center;gap:17px;margin-right:7px;position:relative;z-index:1}
.intro-number b{
  font-size:64px;font-weight:300;line-height:1;
  background:linear-gradient(180deg,#ffffff 20%,#7fd8cc 90%);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent;
}
.intro-number span{font-size:10px;color:rgba(255,255,255,.66);line-height:1.9;border-left:1px solid rgba(255,255,255,.28);padding-left:17px}

/* --------------------------------------------------------------------------
   三栏工作区与通用卡片
   -------------------------------------------------------------------------- */
.workspace{display:grid;grid-template-columns:252px minmax(0,1fr) 304px;gap:22px;margin:0 36px;align-items:start}
.settings,.chat-panel,.coordinate-card,.table-wrap,.compare-controls,.region-bar{
  background:var(--grad-card);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow-sm);
}
.settings{padding:20px 17px}
.panel-heading,.param-heading{display:flex;align-items:center;justify-content:space-between;font-size:12px;font-weight:650}
.panel-heading>span:first-child,.param-heading>span:first-child{position:relative;padding-left:11px}
.panel-heading>span:first-child::before,.param-heading>span:first-child::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:4px;height:13px;border-radius:2px;background:var(--grad-teal);
}
.muted{font-size:9px;color:#92a0a8;font-weight:400;letter-spacing:.4px}

/* 搜索框 */
.search{display:flex;align-items:center;background:#f2f6f7;border-radius:9px;margin:14px 0 10px;border:1px solid #e7edee;transition:border-color .18s,box-shadow .18s}
.search:focus-within{border-color:var(--teal-bright);box-shadow:var(--ring);background:#fff}
.search span{font-size:20px;padding:0 9px;color:#94a1a8}
.search input{border:0;background:transparent;width:100%;min-width:0;font-size:11px;padding:9px 0}

/* 投影列表 */
.projection-list{max-height:304px;overflow:auto;padding-right:3px;scrollbar-width:thin;scrollbar-color:#cfdadb transparent}
.projection-item{
  display:flex;width:100%;gap:9px;align-items:center;text-align:left;border:0;border-radius:8px;
  padding:8px 9px;background:transparent;margin-bottom:3px;position:relative;
  transition:background .15s,box-shadow .15s;
}
.projection-item:hover{background:#f0f6f5}
.projection-item.active{
  background:linear-gradient(90deg,rgba(20,184,166,.16),rgba(20,184,166,.04));
  box-shadow:inset 3px 0 0 var(--teal-bright);
  color:#0c6f66;
}
.projection-item .num{font-size:10px;min-width:20px;color:#a1afb4;font-variant-numeric:tabular-nums}
.projection-item.active .num{color:#0e9488}
.projection-item strong{font-size:11px;font-weight:550}
.projection-item small{display:block;font-size:8px;line-height:1.3;color:#91a0a7;letter-spacing:.3px}
.projection-item .dot{margin-left:auto;width:6px;height:6px;border-radius:50%;background:var(--grad-teal);box-shadow:0 0 6px rgba(20,184,166,.7)}

/* 参数区 */
.param-heading{margin-top:20px;padding-top:17px;border-top:1px solid var(--line)}
.text-button{background:transparent;border:0;color:var(--teal);font-size:10px;padding:2px 0;transition:color .15s}
.text-button:hover{text-decoration:underline;color:#0b7c73}
.param-fields{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:12px 0}
.field label{font-size:10px;color:#81919b;display:block;margin-bottom:4px}
.field .input-unit{display:flex;border:1px solid #dde5e9;border-radius:7px;align-items:center;background:#fff;transition:border-color .15s,box-shadow .15s}
.field .input-unit:focus-within{border-color:var(--teal-bright);box-shadow:var(--ring)}
.field input{width:100%;min-width:0;border:0;border-radius:7px;padding:7px;background:transparent;font-size:11px;color:var(--ink)}
.field input:focus-visible{outline:0}
.field .unit{padding-right:8px;color:#9ca8af;font-size:10px}
.model-note{font-size:9px;color:#97a3aa;margin-top:9px;line-height:1.7}

/* 数据导入盒 */
.data-box{
  background:linear-gradient(150deg,#f0f7f5,#eef5f3);
  border:1px solid #e0ece8;border-radius:12px;padding:13px;margin-top:17px;
}
.data-box .eyebrow{font-size:8px;letter-spacing:1.2px;color:#6f9a90}
.data-box h3{font-size:11px;margin-top:5px}
.data-box p{font-size:10px;color:#85948e;margin:6px 0 10px;word-break:break-all}
.data-box .button{font-size:10px;padding:7px}
.data-box small{display:block;color:#99a59e;font-size:9px;margin-top:5px}
.file-button{cursor:pointer}
.file-button input{display:none}
.data-box .text-button{display:block;margin-top:8px}

/* --------------------------------------------------------------------------
   主面板
   -------------------------------------------------------------------------- */
.main-panel{min-width:0}
.section-bar{display:flex;align-items:center;justify-content:space-between;gap:15px;margin:0 0 15px}
.section-bar h2{margin-top:4px}
.section-bar .eyebrow{color:#7f9a94}

/* 分段选择器 */
.segmented{display:flex;background:#e6ecf0;padding:3px;border-radius:10px;flex-shrink:0;box-shadow:inset 0 1px 3px rgba(14,42,59,.06)}
.segmented button{padding:6px 14px;background:transparent;border:0;border-radius:7px;font-size:11px;color:#7f909c;transition:all .16s var(--ease)}
.segmented button:hover{color:var(--navy)}
.segmented button.active{background:#fff;box-shadow:0 2px 7px rgba(14,42,59,.14);color:var(--navy);font-weight:650}

/* 区域条 */
.region-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 14px;margin-bottom:12px;border-radius:12px}
.region-bar>div{display:flex;align-items:center;gap:13px}
.region-bar>div>span{font-size:11px;color:#728995;font-weight:600}
.region-bar small{font-size:9px;color:#91a3aa}
.region-bar .segmented{background:#e9eff0}
.region-bar .segmented button{min-width:60px;padding:5px 14px}
.region-bar .segmented button.active{color:#0c7c73}

/* 图层控制行 */
.map-controls{display:flex;justify-content:space-between;font-size:10px;color:#748793;gap:12px;margin-bottom:10px;flex-wrap:wrap;align-items:center}
.layer-controls{display:flex;gap:14px;flex-wrap:wrap}
.layer-controls label{display:inline-flex;align-items:center;cursor:pointer;padding:3px 2px;transition:color .15s}
.layer-controls label:hover{color:var(--navy)}
input[type=checkbox]{accent-color:var(--teal);width:13px;height:13px;vertical-align:middle;margin:0 5px 2px 0;cursor:pointer}
.scale-control{display:inline-flex;align-items:center;cursor:pointer}

/* 地图卡片 */
.maps{display:grid;gap:14px}
.maps.single{grid-template-columns:1fr}
.maps.compare{grid-template-columns:repeat(2,minmax(0,1fr))}
.maps.overview{grid-template-columns:repeat(3,minmax(0,1fr))}
.map-card{
  background:#fff;border:1px solid #dfe7ea;border-radius:14px;overflow:hidden;min-width:0;position:relative;
  box-shadow:var(--shadow-sm);transition:box-shadow .22s var(--ease),transform .22s var(--ease),border-color .22s;
}
.map-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px);border-color:#cfe0e3}
.map-card header{display:flex;justify-content:space-between;align-items:center;padding:14px 18px 10px;gap:5px}
.map-card header .eyebrow{font-size:8px;letter-spacing:1px}
.map-card h3{font-size:13.5px;font-weight:650}
.map-card h3 .map-index{font-size:10px;font-weight:450;color:#99abb1;margin-right:8px}
.pill{
  background:linear-gradient(135deg,#dcf3ec,#cfeee6);color:#0f766e;
  font-size:9px;font-weight:600;padding:3px 9px;border-radius:20px;white-space:nowrap;
  border:1px solid rgba(20,184,166,.22);
}
.map-card svg{
  display:block;width:100%;height:440px;touch-action:none;cursor:grab;
  background:linear-gradient(160deg,#f8fbfb 0%,#eef4f6 100%);
  border-top:1px solid #eef3f4;
}
.map-card svg:active{cursor:grabbing}
.maps.compare svg{height:270px}
.maps.overview svg{height:180px}
.maps.overview .map-card:hover{transform:none}
.maps.overview .map-card header{padding:10px 10px 4px}
.maps.overview h3{font-size:10px}
.maps.overview .map-card header .eyebrow{font-size:6px}
.maps.overview .pill{font-size:8px;padding:2px 6px}
.map-card .map-caption{display:flex;justify-content:space-between;padding:8px 16px;font-size:9px;color:#93a3ad;border-top:1px solid #f0f3f4;background:#fbfdfd}
.map-card .card-tools{position:absolute;right:12px;top:80px;display:flex;flex-direction:column;gap:4px}
.card-tools button{
  height:26px;width:26px;border-radius:7px;border:1px solid #d8e2e6;
  background:rgba(255,255,255,.94);color:#7f949d;
  box-shadow:var(--shadow-sm);transition:all .15s;
}
.card-tools button:hover{background:var(--grad-teal);color:#fff;border-color:transparent;box-shadow:0 3px 9px rgba(15,154,141,.4)}
.map-card .map-error{padding:50px 20px;color:#a25744;min-height:200px}
.projection-domain{font-size:9px;line-height:1.7;color:#8298a0;background:#f6faf9;padding:8px 13px;border-top:1px solid #edf1f0;min-height:42px}
.maps.overview .projection-domain{font-size:8px;padding:6px 9px;min-height:42px}

.map-footer{display:flex;justify-content:space-between;color:#8b9ca6;font-size:9px;margin:9px 2px;gap:10px;flex-wrap:wrap;align-items:center}
.legend{display:inline-flex;align-items:center;gap:13px;flex-wrap:wrap}
.legend-item{display:inline-flex;align-items:center;gap:5px;white-space:nowrap}
.legend-item i{display:inline-block;flex-shrink:0}
.legend-swatch{width:9px;height:7px;background:#dbe8de;border:1px solid #9bafa3;border-radius:2px}
.legend-circle{width:8px;height:8px;border:1px solid var(--orange);border-radius:50%}
.lg-line-grid{width:15px;border-top:1.5px dashed #b7cbd0}
.lg-line-meridian{width:15px;border-top:2px solid #6faaa4}
.lg-line-standard{width:15px;border-top:1.5px dashed #a3bd85}
.lg-line-rays{width:15px;border-top:1.5px dashed #7998b8}
.lg-dot-city{width:7px;height:7px;border-radius:50%;background:#3c6d76}
.lg-dot-sample{width:8px;height:8px;border-radius:50%;background:#df8752;border:1.5px solid #fff;box-shadow:0 0 0 1px rgba(120,60,20,.25)}

.export-bar{display:flex;justify-content:space-between;align-items:center;gap:8px;margin:10px 0 20px;flex-wrap:wrap}
.export-bar p{font-size:9px;color:#91a0a9;max-width:450px}
.export-bar>div{display:flex;gap:7px}

/* 教学提示卡 */
.lesson-card{
  display:flex;justify-content:space-between;gap:18px;padding:22px 24px;
  background:linear-gradient(120deg,#e7f3ee 0%,#e2efe9 60%,#ddece6 100%);
  border:1px solid #d5e6dd;border-radius:14px;position:relative;overflow:hidden;
  box-shadow:var(--shadow-sm);
}
.lesson-card::before{content:"";position:absolute;left:0;top:0;bottom:0;width:5px;background:var(--grad-teal)}
.lesson-card .eyebrow{color:#6f9a8d}
.lesson-card h3{font-size:15px;margin:5px 0 8px}
.lesson-card p{font-size:11px;color:#5f7a74}
.lesson-card .lesson-tip{margin-top:7px;color:#82958e;font-size:10px}
.property-large{
  font-size:30px;font-weight:300;white-space:nowrap;align-self:center;
  background:linear-gradient(135deg,#8fb8ab,#5e9484);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent;
}
.source-note{font-size:9px;line-height:1.9;color:#97a4ac;margin:13px 2px 0}

/* --------------------------------------------------------------------------
   教学助手聊天面板
   -------------------------------------------------------------------------- */
.chat-panel{overflow:hidden;display:flex;flex-direction:column;min-height:650px;max-height:900px}
.chat-heading{
  display:flex;align-items:center;gap:11px;padding:17px;
  background:var(--grad-brand);border-bottom:1px solid rgba(255,255,255,.08);
}
.assistant-icon{
  display:grid;place-items:center;width:33px;height:33px;border-radius:10px;font-size:19px;
  background:rgba(94,234,212,.15);border:1px solid rgba(94,234,212,.4);color:var(--teal-soft);
  box-shadow:0 0 10px rgba(20,184,166,.3);
}
.chat-heading h2{font-size:13px;letter-spacing:.3px;color:#fff}
.chat-heading p{font-size:9px;color:rgba(255,255,255,.6);margin-top:3px}
.icon-button{margin-left:auto;background:transparent;border:0;font-size:21px;color:rgba(255,255,255,.65);border-radius:7px;width:28px;height:28px;transition:all .15s}
.icon-button:hover{background:rgba(255,255,255,.12);color:#fff}
.chat-intro{padding:23px 20px 16px}
.chat-intro .eyebrow{font-size:8px;letter-spacing:1.1px;color:#7f9a94}
.chat-intro h3{
  font-size:23px;font-weight:600;line-height:1.6;margin:8px 0;
  background:linear-gradient(120deg,#17455e,#0f7d76);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent;
}
.chat-intro p{font-size:11px;color:#92a0a5;line-height:1.9}
.prompt-examples{padding:0 20px;display:flex;flex-direction:column;gap:7px}
.prompt-examples button{
  text-align:left;border:1px solid #e7edec;border-radius:8px;font-size:10px;color:#7c9296;
  padding:8px 12px;background:#fafcfc;transition:all .16s var(--ease);
}
.prompt-examples button:hover{background:#eef8f5;color:var(--teal);border-color:#bfe3da;transform:translateX(3px);box-shadow:var(--shadow-sm)}
.chat-messages{flex:1;min-height:90px;max-height:400px;overflow:auto;padding:15px;scrollbar-width:thin;background:#f8fbfb}
.message{
  font-size:11px;line-height:1.9;padding:10px 13px;margin-bottom:10px;border-radius:11px;
  white-space:pre-wrap;overflow-wrap:anywhere;
  background:#fff;border:1px solid #e4edea;color:#55706a;box-shadow:var(--shadow-sm);
  border-top-left-radius:4px;
}
.message.user{
  background:linear-gradient(135deg,#eef3f8,#e8eef5);border-color:#dfe7ef;color:#4e6880;
  margin-left:20px;border-radius:11px;border-top-right-radius:4px;
}
.message .message-label{display:block;font-size:8px;letter-spacing:.7px;color:#93a19c;margin-bottom:3px;font-weight:650}
.chat-form{
  margin:11px 15px 0;border:1px solid #dde6e5;border-radius:11px;padding:10px;background:#fff;
  transition:border-color .18s,box-shadow .18s;
}
.chat-form:focus-within{border-color:var(--teal-bright);box-shadow:var(--ring)}
.chat-form textarea{border:0;width:100%;resize:vertical;max-height:150px;min-height:54px;font-size:11px;background:transparent;outline:0}
.chat-form>div{display:flex;justify-content:space-between;align-items:center}
.chat-form span{font-size:8px;color:#a3afae}
.send-button{
  background:var(--grad-teal);color:#fff;border:0;border-radius:8px;width:29px;height:29px;font-size:17px;
  box-shadow:0 3px 9px rgba(15,154,141,.4);transition:all .16s var(--ease);
}
.send-button:hover{transform:translateY(-1px) scale(1.05);box-shadow:0 5px 13px rgba(15,154,141,.5)}
.chat-disclaimer{font-size:8px;text-align:center;color:#a4b0b3;padding:8px}
.action-preview{margin:0 15px;padding:12px;background:#eff7f3;border:1px solid #dcebe2;border-radius:9px;font-size:10px}
.action-preview p{margin-bottom:8px}
.action-preview .button{font-size:10px}
.action-preview .text-button{margin-left:12px}

/* 对比选择 */
.compare-controls{padding:12px 14px;font-size:10px;margin-bottom:12px;border-radius:12px}
.compare-controls>span{color:#82959a;font-weight:600}
.compare-controls>div{display:flex;gap:7px;flex-wrap:wrap;margin-top:8px}
.compare-controls label{
  background:#f2f7f6;padding:4px 8px;border-radius:7px;font-size:9px;cursor:pointer;
  border:1px solid #e5edec;transition:all .15s;
}
.compare-controls label:hover{border-color:#9fd4c9;background:#eaf6f2}

/* --------------------------------------------------------------------------
   坐标工作台
   -------------------------------------------------------------------------- */
.coordinate-card{padding:23px}
.coordinate-title{display:flex;justify-content:space-between;align-items:center}
.coordinate-title select{
  border-radius:8px;padding:7px 9px;font-size:11px;background:#fff;color:var(--ink);
  border:1px solid #dde5e9;cursor:pointer;
}
.coordinate-title select:focus{border-color:var(--teal-bright);box-shadow:var(--ring)}
.coordinate-card>p{font-size:11px;color:#8a9ca5;margin-top:16px}
#coordinate-input{
  width:100%;height:180px;resize:vertical;border:1px solid #dfe7ea;background:#f7fafb;border-radius:9px;
  padding:16px;margin-top:10px;font-family:Consolas,"Cascadia Mono",monospace;font-size:13px;line-height:2;color:#3d6070;
}
#coordinate-input:focus{border-color:var(--teal-bright);box-shadow:var(--ring);background:#fff;outline:0}
.coordinate-actions{display:flex;align-items:center;gap:16px;margin-top:13px}
.coordinate-actions .primary{margin-left:auto}
.coordinate-card>p.axis-note{font-size:9px;color:#9ba7ac}
.result-heading{display:flex;align-items:center;justify-content:space-between;margin:24px 0 10px}
.result-heading h3{font-size:13px}
.table-wrap{overflow:auto;border-radius:12px}
table{border-collapse:collapse;width:100%;font-size:10px;text-align:left;white-space:nowrap}
th{background:linear-gradient(180deg,#eef4f5,#e7eff0);color:#6d8591;font-weight:600;padding:11px 13px;border-bottom:1px solid #e2eaec}
td{padding:12px 13px;border-top:1px solid #eef1f3;font-variant-numeric:tabular-nums}
tbody tr{transition:background .12s}
tbody tr:hover{background:#f3faf8}
.empty{height:120px;text-align:center;color:#a1aeb5}
.status-ok{color:#1d9a78;font-weight:600}
.status-error{color:#bc6957;white-space:normal;min-width:120px}
.factor-card{
  display:flex;gap:22px;padding:19px 20px;border-radius:13px;margin-top:15px;flex-wrap:wrap;
  background:linear-gradient(120deg,#e6f3ed,#e0efe9);border:1px solid #d3e6dc;box-shadow:var(--shadow-sm);
}
.factor-card b{display:block;font-size:21px;font-weight:600;color:#0e6f60}
.factor-card span{font-size:9px;color:#7d968c}
.factor-card p{width:100%;font-size:9px;color:#7d9087}

/* --------------------------------------------------------------------------
   教学手册
   -------------------------------------------------------------------------- */
.guide-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.guide-grid article{
  background:var(--grad-card);border:1px solid var(--line);border-radius:14px;padding:23px;
  box-shadow:var(--shadow-sm);transition:box-shadow .2s var(--ease),transform .2s var(--ease),border-color .2s;
  position:relative;overflow:hidden;
}
.guide-grid article::after{content:"";position:absolute;left:0;top:0;bottom:0;width:0;background:var(--grad-teal);transition:width .22s var(--ease)}
.guide-grid article:hover{box-shadow:var(--shadow-md);transform:translateY(-3px);border-color:#cfe4de}
.guide-grid article:hover::after{width:4px}
.guide-grid article>span{
  font-size:9px;letter-spacing:1.2px;font-weight:700;
  background:linear-gradient(120deg,#3c8a7d,#14b8a6);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent;
}
.guide-grid h3{margin:13px 0 10px;font-size:15px}
.guide-grid p{font-size:11px;line-height:2;color:#82939c}
.guide-grid button{margin-top:16px;font-weight:600}
.guide-explain{
  background:linear-gradient(120deg,#e8f3ef,#e3efe9);border:1px solid #d6e6dd;
  padding:25px;border-radius:14px;margin-top:18px;box-shadow:var(--shadow-sm);
}
.guide-explain h3{font-size:13px;margin-bottom:8px;color:#2c5a50}
.guide-explain p{font-size:11px;line-height:2;color:#6f8a81;margin-bottom:15px}
.guide-explain a{font-weight:600}
.reference-list{margin-top:20px}
.reference-list details{
  background:#fff;border:1px solid var(--line);margin-top:8px;border-radius:10px;padding:13px 17px;
  box-shadow:var(--shadow-sm);transition:border-color .18s,box-shadow .18s;
}
.reference-list details:hover{border-color:#c4ded6}
.reference-list details[open]{border-color:#a9d8cb;background:#fbfefd;box-shadow:var(--shadow-sm)}
.reference-list summary{cursor:pointer;font-size:11px;font-weight:600;transition:color .15s}
.reference-list summary:hover{color:var(--teal)}
.reference-list p{font-size:11px;color:#8699a0;margin-top:10px;line-height:1.9}

/* --------------------------------------------------------------------------
   页脚 / Toast / 加载
   -------------------------------------------------------------------------- */
.page-footer{display:flex;justify-content:space-between;margin:30px 36px 24px;color:#9aa8b0;font-size:8px;letter-spacing:1.2px}
.hidden{display:none!important}
.toast{
  position:fixed;bottom:30px;left:50%;transform:translateX(-50%) translateY(20px);opacity:0;pointer-events:none;z-index:100;
  background:linear-gradient(135deg,#16394c,#0e2a3b);color:#fff;padding:13px 24px;border-radius:11px;font-size:12px;max-width:80vw;
  box-shadow:var(--shadow-lg);border:1px solid rgba(94,234,212,.25);transition:all .25s var(--ease);
}
.toast.visible{opacity:1;transform:translateX(-50%) translateY(0)}
.loading{
  padding:100px 20px;text-align:center;color:#819ba0;background:#fff;border:1px solid var(--line);border-radius:12px;
  animation:loading-pulse 1.6s ease-in-out infinite;
}
@keyframes loading-pulse{0%,100%{opacity:1}50%{opacity:.45}}
.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}
.workspace.chat-hidden{grid-template-columns:252px minmax(0,1fr)}
.workspace.chat-hidden .chat-panel{display:none}
.download-links{margin:16px 36px;display:flex;flex-wrap:wrap;gap:12px;font-size:12px}
.download-links:empty{display:none}
.download-links a{
  padding:8px 13px;background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow-sm);
  transition:all .16s var(--ease);
}
.download-links a:hover{border-color:#9fd4c9;color:var(--teal);box-shadow:var(--shadow-md)}
.field:has(select){grid-column:1/-1}
.field select{width:100%;min-width:0;border-radius:7px;padding:8px;background:#f5f8f8;color:var(--ink);font-size:11px;border:1px solid #dde5e9;cursor:pointer}
.field select:focus{border-color:var(--teal-bright);box-shadow:var(--ring)}
.field input:disabled,.field select:disabled{opacity:.55}

/* --------------------------------------------------------------------------
   响应式
   -------------------------------------------------------------------------- */
@media(min-width:1650px){
  .workspace{grid-template-columns:272px minmax(0,1fr) 324px;gap:26px}
  .map-card svg{height:510px}
  .maps.compare svg{height:330px}
  .maps.overview svg{height:205px}
  .projection-list{max-height:350px}
  .chat-panel{min-height:740px}
}
@media(max-width:1200px){
  .workspace{grid-template-columns:224px minmax(0,1fr);margin:0 22px;gap:16px}
  .chat-panel{grid-column:2;min-height:0;max-height:none}
  .chat-intro{padding:16px 20px}
  .chat-intro h3 br{display:none}
  .chat-intro h3{font-size:18px}
  .prompt-examples{flex-direction:row;flex-wrap:wrap}
  .chat-messages{max-height:260px}
  .topbar{padding:0 22px;gap:20px}
  .brand{min-width:190px}
  .intro{margin:22px;padding:26px 30px}
  .intro::before,.intro::after{right:40px}
  .course-badge{display:none}
  .topbar #toggle-chat{margin-left:auto}
  .intro h1{font-size:25px}
  .maps.overview{grid-template-columns:repeat(2,minmax(0,1fr))}
  .workspace.chat-hidden{grid-template-columns:224px minmax(0,1fr)}
  .page-footer{margin-left:22px;margin-right:22px}
  .download-links{margin:16px 22px}
}
@media(max-width:760px){
  .topbar{height:auto;min-height:70px;flex-wrap:wrap;padding:12px 16px;gap:12px}
  .brand{min-width:0;font-size:17px}
  .brand small{font-size:7px}
  .topbar nav{order:3;flex-basis:100%;height:38px;justify-content:center}
  .topbar #toggle-chat{font-size:10px;padding:7px 10px}
  .intro{margin:18px 16px;padding:22px;border-radius:16px}
  .intro::before,.intro::after{display:none}
  .intro h1{font-size:21px;letter-spacing:0}
  .intro .eyebrow{font-size:7px}
  .intro p{font-size:10px}
  .intro-number{display:none}
  .workspace,.workspace.chat-hidden{display:flex;flex-direction:column;margin:0 16px;gap:20px}
  .settings{width:100%;padding:15px}
  .projection-list{max-height:150px;display:grid;grid-template-columns:1fr 1fr;gap:2px}
  .projection-item{padding:5px}
  .param-heading{margin-top:12px;padding-top:12px}
  .param-fields{grid-template-columns:repeat(3,1fr)}
  .data-box{margin-top:13px;display:flex;align-items:center;gap:9px;flex-wrap:wrap}
  .data-box h3,.data-box .eyebrow,.data-box small{display:none}
  .data-box p{margin:0;flex-basis:100%}
  .data-box .wide{width:auto}
  .data-box .text-button{margin:0}
  .main-panel,.chat-panel{width:100%}
  .section-bar h2{font-size:18px}
  .segmented button{padding:5px 9px;font-size:10px}
  .map-card svg{height:350px}
  .maps.compare svg{height:210px}
  .maps.overview{grid-template-columns:repeat(2,minmax(0,1fr))}
  .maps.overview svg{height:160px}
  .maps.compare header{padding:10px}
  .maps.compare h3{font-size:10px}
  .map-controls{font-size:9px}
  .layer-controls{gap:9px}
  .property-large{font-size:22px}
  .lesson-card{padding:16px}
  .guide-grid{grid-template-columns:1fr}
  .coordinate-card{padding:15px}
  .coordinate-title{gap:10px}
  .coordinate-title select{max-width:170px}
  .coordinate-actions{gap:9px}
  .coordinate-actions .button{font-size:10px}
  .page-footer{margin:22px 16px;gap:10px;font-size:7px}
  .maps.compare .pill{display:none}
  .chat-panel{min-height:440px}
  .chat-intro{padding-bottom:10px}
  .prompt-examples{padding-bottom:8px}
  .region-bar{padding:9px 10px;gap:8px}
  .region-bar small{max-width:170px;font-size:8px}
  .projection-domain{min-height:52px}
  .download-links{margin:14px 16px}
}