@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Noto+Sans+SC:wght@400;500;600;700&display=swap');

/* ==========================================================================
   爱玩牛 · 财会 AI 学习工作台 — 设计系统
   品牌：克莱因蓝 #002FA7（主） · 爱马仕橙 #FF770F（行动） · 中国红 #D82C16（警示）
   浅色主题 · 响应式 · 模块化
   ========================================================================== */
:root{
  /* 品牌色 */
  --blue:#002FA7;        --blue-deep:#00207A;   --blue-ink:#071A4A;
  --orange:#FF770F;      --orange-deep:#E56809;
  --red:#D82C16;
  /* 中性 */
  --ink:#182033;         --ink-2:#333333;
  --muted:#6F7C93;       --faint:#93A0B5;
  /* 底色 */
  --bg:#F4F6FA;          --surface:#ffffff;
  --blue-soft:#EEF3FF;   --orange-soft:#FFF7EF; --red-soft:#FDECEA;
  --line:#E1E7F2;        --line-soft:#EDF1F8;
  /* 尺寸 */
  --r-lg:16px; --r-md:12px; --r-sm:9px;
  --sh-sm:0 1px 2px rgba(24,32,51,.05);
  --sh:0 6px 20px rgba(24,32,51,.06),0 1px 2px rgba(24,32,51,.04);
  --sh-lg:0 22px 60px rgba(0,32,120,.18);
  --sidebar-w:256px;
  font-family:'DM Sans','Noto Sans SC',system-ui,-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;
  font-size:16px; color:var(--ink); background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
*{box-sizing:border-box}
body{margin:0}
button,input,textarea,select{font:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed;opacity:.55}
a{color:var(--blue)}
.hidden{display:none!important}
::selection{background:#002FA726}

/* ============================ 登录页 ============================ */
.login-page{min-height:100vh;display:grid;grid-template-columns:1.05fr .95fr}
.login-intro{background:var(--blue);color:#fff;min-height:100vh;padding:52px 6vw;
  display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden}
/* 同心圆装饰 */
.login-intro::after{content:'';position:absolute;right:-16vw;bottom:4%;width:44vw;height:44vw;
  border:1px solid #ffffff2e;border-radius:50%;
  box-shadow:0 0 0 70px #ffffff0d,0 0 0 146px #ffffff08;pointer-events:none}
.login-intro::before{content:'';position:absolute;left:-10vw;top:-14vw;width:34vw;height:34vw;
  border-radius:50%;background:radial-gradient(circle,#FF770F33,transparent 70%);pointer-events:none}
.login-intro>*{position:relative;z-index:1}
.intro-copy{max-width:560px}
.eyebrow{color:#9fb6ee;font-size:12px;letter-spacing:.16em;font-weight:700;text-transform:uppercase}
.intro-copy .eyebrow{color:#ffc396}
.intro-copy h1{font-size:clamp(40px,4.6vw,66px);line-height:1.2;letter-spacing:-.035em;margin:18px 0 22px;font-weight:700}
.intro-copy h1::after{content:'';display:block;width:64px;height:5px;border-radius:3px;background:var(--orange);margin-top:26px}
.intro-copy>p:last-child{max-width:430px;line-height:1.9;color:#d3defb;font-size:15.5px;margin:0}
.login-foot{color:#c3d1f5;font-size:13px;letter-spacing:.02em;
  border-top:1px solid #ffffff2b;padding-top:20px}
.login-panel{display:flex;align-items:center;justify-content:center;padding:38px;background:var(--bg)}
.login-card{width:min(420px,100%);background:var(--surface);padding:44px;border:1px solid var(--line);
  box-shadow:var(--sh-lg);border-radius:var(--r-lg)}
.card-kicker{color:var(--orange);font-size:11.5px;letter-spacing:.16em;font-weight:800;text-transform:uppercase}
.login-card h2{font-size:27px;margin:12px 0 8px;letter-spacing:-.03em;color:var(--ink)}
.login-card>p{color:var(--muted);margin:0 0 32px;line-height:1.7;font-size:14px}
.login-card label,.form-field{display:block;font-size:13.5px;font-weight:600;margin-bottom:18px;color:var(--ink)}
.login-card input,.field-input,textarea,select{display:block;width:100%;border:1px solid #cdd8eb;
  background:#fff;border-radius:var(--r-sm);padding:12px 14px;margin-top:8px;outline:none;
  color:var(--ink);transition:border-color .18s,box-shadow .18s}
.login-card input:focus,.field-input:focus,textarea:focus,select:focus{
  border-color:var(--orange);box-shadow:0 0 0 3px #FF770F26}
textarea{resize:vertical;line-height:1.7;min-height:130px}
.pw-wrap{position:relative}
.pw-wrap input{padding-right:46px}
.pw-toggle{position:absolute;right:6px;top:50%;transform:translateY(-50%);border:0;background:none;
  color:var(--faint);font-size:12px;font-weight:700;padding:6px 8px;border-radius:6px}
.pw-toggle:hover{color:var(--blue);background:var(--blue-soft)}
.primary{background:var(--orange);border:1px solid var(--orange);color:#fff;border-radius:var(--r-sm);
  padding:12px 19px;font-weight:700;display:inline-flex;align-items:center;justify-content:space-between;
  gap:20px;letter-spacing:.01em;transition:background .18s,transform .18s,box-shadow .18s}
.primary:hover{background:var(--orange-deep);border-color:var(--orange-deep);box-shadow:0 10px 24px #FF770F3d}
.primary.wide{width:100%;margin-top:4px}
.secondary{background:#fff;color:var(--blue);border:1px solid #adc0ec;border-radius:var(--r-sm);
  padding:10px 16px;font-weight:600;transition:background .18s}
.secondary:hover{background:var(--blue-soft)}
.form-error{min-height:22px;color:var(--red);font-size:13px;margin-top:8px;font-weight:600}
.demo-hint{margin-top:22px;padding-top:18px;border-top:1px solid var(--line-soft);color:var(--faint);font-size:12.5px}
.demo-hint strong{color:var(--ink)}

/* ============================ 应用骨架 ============================ */
.app-shell{display:flex;min-height:100vh}
.sidebar{width:var(--sidebar-w);flex:none;background:var(--blue);color:#e7eeff;display:flex;
  flex-direction:column;min-height:100vh;padding:28px 16px 18px;position:sticky;top:0;height:100vh}
.side-top{padding:0 15px 40px}
.side-section-label{font-size:11px;font-weight:700;letter-spacing:.16em;color:#adc2fb;margin:0 15px 12px}
.nav-item{display:flex;align-items:center;gap:13px;width:100%;color:#d3defb;border:0;border-radius:var(--r-sm);
  background:transparent;text-align:left;padding:12px 15px;margin-bottom:4px;font-weight:500;font-size:14px;
  border-left:3px solid transparent;transition:background .18s,color .18s}
.nav-item:hover{background:#ffffff1c;color:#fff}
.nav-item.active{background:#ffffff26;color:#fff;border-left-color:var(--orange);font-weight:600}
.nav-icon{font-size:18px;width:22px;text-align:center;font-weight:400}
.side-bottom{margin-top:auto}
.side-progress{background:#ffffff16;border:1px solid #ffffff32;border-radius:var(--r-md);
  padding:16px;margin:0 2px 16px;display:flex;align-items:center;gap:14px}
.side-progress .ring{flex:none}
.side-progress .sp-text{min-width:0}
.side-progress strong{display:block;font-size:13px;color:#fff}
.side-progress small{display:block;font-size:11.5px;color:#c3d1f5;line-height:1.6;margin-top:3px}
.profile{width:100%;background:transparent;border:0;border-top:1px solid #ffffff2b;color:#e7eeff;
  display:flex;align-items:center;gap:11px;text-align:left;padding:17px 4px 0}
.profile:hover .profile-arrow{color:#fff}
.avatar,.top-avatar{width:36px;height:36px;background:var(--orange);color:#fff;display:grid;place-items:center;
  border-radius:50%;font-weight:700;flex:none}
.profile strong,.profile small{display:block}
.profile strong{font-size:13px}
.profile small{font-size:11px;color:#c3d1f5;margin-top:2px}
.profile-arrow{margin-left:auto;color:#adc2fb;transition:color .18s}
.main-wrap{flex:1;min-width:0;display:flex;flex-direction:column}
.topbar{height:68px;background:#ffffffd9;backdrop-filter:blur(10px);border-bottom:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;gap:14px;padding:0 34px;
  position:sticky;top:0;z-index:10}
.topbar #breadcrumb{font-weight:600;color:var(--ink);font-size:13.5px}
.topbar #breadcrumb span{padding:0 8px;color:var(--faint)}
.top-right{display:flex;align-items:center;gap:18px}
.top-progress{display:flex;align-items:center;gap:9px;font-size:12px;color:var(--muted)}
.top-progress .bar{width:104px;height:6px;background:#E7EDFA;border-radius:99px;overflow:hidden}
.top-progress .bar i{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--orange));border-radius:99px}
.term{font-size:12px;color:var(--muted);background:var(--bg);border:1px solid var(--line);
  padding:6px 12px;border-radius:99px;font-weight:600}
.top-avatar{width:32px;height:32px;font-size:13px}
.mobile-only{display:none}
.icon-button{border:0;background:none;font-size:22px;color:var(--ink);padding:5px}
main{max-width:1560px;width:100%;margin:0 auto;padding:32px 34px 80px}

/* ============================ 通用 ============================ */
.page-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:20px;margin-bottom:26px;flex-wrap:wrap}
.page-heading h1{font-size:30px;line-height:1.25;letter-spacing:-.035em;margin:8px 0 7px;color:var(--ink)}
.page-heading p{margin:0;color:var(--muted);line-height:1.6;font-size:14px;max-width:760px}
.section-kicker{color:var(--blue);font-size:12px;letter-spacing:.15em;font-weight:700;text-transform:uppercase}
.muted{color:var(--faint)}
.card,.stat-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh-sm)}
.section-title{display:flex;justify-content:space-between;align-items:center;gap:15px;margin:0 0 15px}
.section-title h2{font-size:20px;margin:0;letter-spacing:-.02em;color:var(--ink)}
.text-link{color:var(--blue);background:none;border:none;padding:3px;font-weight:600;font-size:13px}
.text-link:hover{text-decoration:underline}
.empty{padding:44px 30px;text-align:center;color:var(--faint);line-height:1.7;font-size:14px}
.warning{background:var(--red-soft);border:1px solid #f2bdb6;color:#9d2415;border-radius:var(--r-sm);
  padding:12px 14px;font-size:12.5px;line-height:1.7;margin:14px 0}
.mini-progress{height:6px;background:#E7EDFA;border-radius:99px;overflow:hidden;margin-top:13px}
.mini-progress span{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--orange));border-radius:99px;transition:width .4s}
.chip{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:600;color:var(--blue);
  background:var(--blue-soft);border-radius:99px;padding:5px 12px}
.chip.o{background:var(--orange-soft);color:#b85300}

/* ============================ 学习总览 ============================ */
.dashboard-banner{background:linear-gradient(120deg,var(--blue) 0%,#1a4fd0 100%);color:#fff;
  border-radius:var(--r-lg);min-height:196px;padding:34px 38px;display:flex;justify-content:space-between;
  align-items:center;gap:26px;position:relative;overflow:hidden;box-shadow:var(--sh-lg)}
.dashboard-banner::after{content:'';position:absolute;right:-70px;top:-150px;width:400px;height:400px;
  border:1px solid #ffffff38;border-radius:50%;box-shadow:0 0 0 44px #ffffff0a,0 0 0 92px #ffffff06}
.dashboard-banner::before{content:'';position:absolute;left:-60px;bottom:-120px;width:300px;height:300px;
  border-radius:50%;background:radial-gradient(circle,#FF770F33,transparent 70%)}
.dashboard-banner>div:first-child{position:relative;z-index:1;max-width:640px}
.dashboard-banner .section-kicker{color:#ffc396}
.dashboard-banner h2{font-size:28px;margin:10px 0;letter-spacing:-.02em}
.dashboard-banner p{margin:0;color:#d6e0fb;line-height:1.8;font-size:14px}
.banner-stat{position:relative;z-index:1;text-align:center;flex:none}
.banner-stat small{display:block;font-size:12px;color:#d6e0fb;margin-top:10px}
.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:18px 0 30px}
.stat-card{padding:22px 24px}
.stat-card .label{color:var(--muted);font-size:13px;font-weight:600;display:flex;align-items:center;gap:7px}
.stat-card .label i{width:7px;height:7px;border-radius:50%;background:var(--orange);display:inline-block}
.stat-card strong{display:block;font-size:30px;margin:10px 0 3px;color:var(--ink);letter-spacing:-.02em}
.stat-card strong em{font-style:normal;font-size:16px;color:var(--faint);font-weight:600}
.stat-card small{color:var(--faint);font-size:12px}
.two-col{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(280px,1fr);gap:20px}
.task-list{padding:6px 24px}
.task-row{display:flex;align-items:center;gap:14px;padding:16px 0;border-bottom:1px solid var(--line-soft)}
.task-row:last-child{border-bottom:0}
.task-index{width:34px;height:34px;border-radius:var(--r-sm);background:var(--blue-soft);color:var(--blue);
  display:grid;place-items:center;font-size:12px;font-weight:700;flex:none}
.task-info{flex:1;min-width:0}
.task-info strong{font-size:14px;display:block;color:var(--ink)}
.task-info span{font-size:12px;color:var(--faint);display:block;margin-top:4px}
.task-row button{border:0;background:var(--blue-soft);color:var(--blue);border-radius:7px;padding:8px 13px;
  font-size:12px;font-weight:700;white-space:nowrap;transition:background .18s}
.task-row button:hover{background:#dde7ff}
.guide-card{padding:24px}
.guide-card h3{font-size:17px;margin:0 0 10px;color:var(--ink)}
.guide-card p{color:var(--muted);font-size:13px;line-height:1.85;margin:0 0 18px}
.guide-steps{display:grid;gap:12px}
.guide-steps div{display:flex;gap:11px;align-items:center;font-size:13px;color:var(--ink-2)}
.guide-steps span{color:var(--orange);background:var(--orange-soft);border-radius:50%;width:24px;height:24px;
  display:grid;place-items:center;font-weight:800;flex:none;font-size:12px}

/* 进度环 */
.ring{width:120px;height:120px;position:relative}
.ring svg{width:100%;height:100%;transform:rotate(-90deg)}
.ring circle{fill:none;stroke-width:9;stroke-linecap:round}
.ring .bg{stroke:#ffffff33}
.ring .fg{stroke:var(--orange);transition:stroke-dashoffset .6s ease}
.ring .val{position:absolute;inset:0;display:grid;place-items:center;text-align:center}
.ring .val b{font-size:26px;letter-spacing:-.03em;color:#fff;display:block;line-height:1}
.ring .val span{font-size:10.5px;color:#d6e0fb;display:block;margin-top:4px}
.ring.sm{width:60px;height:60px}
.ring.sm circle{stroke-width:7}
.ring.sm .val b{font-size:16px}
.ring.blue .fg{stroke:var(--blue)}
.ring.blue .bg{stroke:#E7EDFA}
.ring.blue .val b{color:var(--blue)}

/* ============================ 课程地图 ============================ */
.layer-filter{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:20px}
.layer-filter button{background:#fff;border:1px solid var(--line);border-radius:99px;padding:8px 16px;
  color:var(--muted);font-size:13px;font-weight:600;transition:.18s}
.layer-filter button:hover{border-color:#adc0ec;color:var(--blue)}
.layer-filter button.active{background:var(--blue);color:#fff;border-color:var(--blue)}
.layer-group{margin-bottom:30px}
.layer-group-head{display:flex;align-items:center;gap:10px;margin:0 0 14px}
.layer-group-head h2{font-size:17px;margin:0;color:var(--ink)}
.layer-group-head span{font-size:12px;color:var(--faint)}
.layer-group-head::after{content:'';flex:1;height:1px;background:var(--line)}
.course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px}
.course-card{padding:24px;display:flex;flex-direction:column;min-height:270px;transition:transform .18s,box-shadow .18s,border-color .18s}
.course-card:hover{transform:translateY(-3px);box-shadow:var(--sh);border-color:#c6d4f2}
.course-top{display:flex;align-items:center;justify-content:space-between;color:var(--faint);font-size:12px}
.course-number{width:40px;height:40px;display:grid;place-items:center;background:var(--blue-soft);
  border-radius:var(--r-md);color:var(--blue);font-weight:700;font-size:14px}
.course-card h3{font-size:18px;line-height:1.5;margin:18px 0 8px;color:var(--ink)}
.course-card p{color:var(--muted);font-size:13px;line-height:1.7;margin:0}
.course-card .course-meta{margin-top:auto;padding-top:20px;display:flex;justify-content:space-between;
  align-items:center;color:var(--faint);font-size:12px;gap:10px}
.course-card .course-meta button{border:0;color:var(--blue);background:none;font-weight:700;padding:4px;white-space:nowrap;font-size:12.5px}
.course-card .course-meta button:hover{text-decoration:underline}
.general-course-card{background:linear-gradient(180deg,var(--blue-soft) 0%,#fff 48%);border-color:#b9cafa}
.general-course-card .course-number{background:var(--blue);color:#fff}
.course-detail{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:20px;align-items:start}
.detail-panel{padding:30px}
.detail-panel h2{font-size:22px;margin:6px 0 12px;color:var(--ink)}
.detail-panel p{line-height:1.8;color:var(--muted);font-size:14px}
.lesson-list{display:grid;gap:10px;margin-top:24px}
.lesson{display:flex;gap:13px;align-items:flex-start;border:1px solid var(--line);padding:15px;
  border-radius:var(--r-sm);cursor:pointer;transition:.18s}
.lesson:hover{border-color:#c6d4f2;background:#fafcff}
.lesson input{accent-color:var(--blue);width:18px;height:18px;margin:2px 0 0;flex:none}
.lesson strong{display:block;font-size:14px;color:var(--ink)}
.lesson small{display:block;color:var(--faint);margin-top:5px;line-height:1.6;font-size:12px}
.lesson:has(input:checked){border-color:#c6d4f2;background:var(--blue-soft)}
.output-box{background:var(--blue-soft);border-radius:var(--r-md);padding:18px;margin-top:22px}
.output-box strong{font-size:13px;color:var(--blue)}
.output-box p{margin:6px 0 0;font-size:13px;color:#3d548a}
.side-info{padding:24px;height:max-content;position:sticky;top:92px}
.side-info h3{font-size:15px;margin:0 0 16px;color:var(--ink)}
.info-line{font-size:13px;line-height:1.7;padding:11px 0;border-top:1px solid var(--line-soft);color:var(--ink-2)}
.info-line:first-of-type{border-top:0}
.info-line span{display:block;color:var(--faint);margin-bottom:2px;font-size:12px}

/* ============================ 通识课模块 ============================ */
.general-module-list{display:grid;gap:14px;margin-top:22px}
.general-module{border:1px solid var(--line);border-radius:var(--r-md);padding:20px;background:#fff;transition:border-color .18s}
.general-module:hover{border-color:#c6d4f2}
.general-module-head{display:flex;align-items:center;gap:13px}
.module-index{width:38px;height:38px;border-radius:var(--r-sm);background:var(--blue-soft);color:var(--blue);
  display:grid;place-items:center;font-size:13px;font-weight:700;flex:none}
.module-heading{flex:1;min-width:0}
.module-heading h3{font-size:17px;line-height:1.5;margin:0;color:var(--ink)}
.module-heading span{display:block;color:var(--faint);font-size:12px;margin-top:3px}
.module-check{display:flex;align-items:center;gap:6px;white-space:nowrap;color:var(--blue);font-size:13px;font-weight:700;cursor:pointer}
.module-check input{width:17px;height:17px;accent-color:var(--blue)}
.general-module>p{font-size:14px;line-height:1.75;color:var(--muted);margin:16px 0 13px}
.module-activity{background:var(--blue-soft);border-radius:var(--r-sm);padding:12px 14px;font-size:13px;line-height:1.7;color:#33487a}
.module-activity strong{color:var(--blue);margin-right:10px}
.module-record{color:var(--faint);font-size:12px;line-height:1.6;margin-top:10px}
.module-caveat{font-size:12px;line-height:1.7;color:#a34d00;background:var(--orange-soft);
  border-left:3px solid var(--orange);padding:9px 12px;margin-top:12px;border-radius:0 6px 6px 0}
.track-list{margin-top:18px;border-top:1px solid var(--line-soft);padding-top:15px}
.track-list h4{font-size:14px;margin:0 0 10px;color:var(--ink)}
.track{border:1px solid var(--line);border-radius:var(--r-sm);margin-top:8px;overflow:hidden}
.track summary{cursor:pointer;padding:12px 14px;display:flex;align-items:center;justify-content:space-between;
  gap:12px;color:var(--blue);font-size:13px;font-weight:600;list-style:none}
.track summary::-webkit-details-marker{display:none}
.track summary::after{content:'▾';color:var(--faint);transition:transform .18s}
.track[open] summary::after{transform:rotate(180deg)}
.track summary span{color:var(--faint);font-size:12px;text-align:right;font-weight:400;margin-left:auto;padding-right:8px}
.track[open] summary{background:var(--blue-soft)}
.track ol{margin:12px 18px 15px 34px;padding:0;font-size:13px;line-height:1.75;color:#435571}
.track li{margin:4px 0}
.source-link{display:inline-block;color:var(--blue);font-size:13px;font-weight:600;text-decoration:none;margin-top:16px}
.source-link:hover{text-decoration:underline}

/* ============================ 平台实操 ============================ */
.platform-intro{display:flex;justify-content:space-between;align-items:center;gap:24px;padding:22px 26px;
  margin-bottom:20px;background:var(--blue-soft);border:1px solid #cfdcfa}
.platform-intro>div{flex:1;max-width:660px}
.platform-intro strong{color:var(--blue);font-size:17px}
.platform-intro p{color:#526483;font-size:13px;line-height:1.7;margin:8px 0}
.platform-doc-link{white-space:nowrap;text-decoration:none}
.platform-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;align-items:start}
.platform-card{padding:26px}
.platform-card-head{display:flex;align-items:center;gap:13px}
.platform-card-head h2{font-size:19px;line-height:1.45;margin:0;color:var(--ink)}
.platform-card-head span:not(.module-index){display:block;color:var(--faint);font-size:12px;margin-top:4px}
.platform-steps{display:grid;gap:9px;margin:22px 0}
.platform-step{display:flex;align-items:flex-start;gap:11px;padding:12px;border:1px solid var(--line);
  border-radius:var(--r-sm);cursor:pointer;transition:.18s}
.platform-step:hover{background:#fafcff;border-color:#c6d4f2}
.platform-step:has(input:checked){background:var(--blue-soft);border-color:#c6d4f2}
.platform-step input{accent-color:var(--blue);width:18px;height:18px;flex:none;margin:2px 0 0}
.platform-step strong{display:block;color:var(--ink);font-size:13px}
.platform-step small{display:block;color:var(--muted);font-size:12px;line-height:1.7;margin-top:4px}
.platform-sample{background:var(--orange-soft);border-left:3px solid var(--orange);border-radius:0 6px 6px 0;padding:12px 14px}
.platform-sample strong{font-size:12px;color:#a94e00}
.platform-sample p{font-size:12px;color:#715942;line-height:1.7;margin:5px 0 0}
.platform-outcome{font-size:12px;color:var(--muted);line-height:1.75;margin:16px 0}
.platform-outcome strong{color:var(--blue)}
.platform-note-form{border-top:1px solid var(--line-soft);padding-top:18px}
.platform-note-form label{font-size:13px;font-weight:700;color:var(--ink)}
.platform-note-form textarea{font-size:13px;min-height:105px}
.platform-note-actions{display:flex;align-items:center;justify-content:space-between;gap:12px}
.platform-note-actions small{color:var(--faint);font-size:11px;line-height:1.5}
.platform-note-actions .primary{white-space:nowrap;font-size:12px;padding:9px 14px}
.platform-footnote{font-size:12px;color:var(--muted);line-height:1.8;margin:19px 0 0;padding:0 2px}

/* ============================ 案例实训 ============================ */
.case-layout{display:grid;grid-template-columns:296px minmax(0,1.02fr) minmax(320px,.92fr);gap:18px;align-items:start}
.case-rail{padding:16px;max-height:calc(100vh - 150px);overflow:auto;position:sticky;top:92px}
.case-rail h3{font-size:13px;margin:0 0 12px;color:var(--faint);letter-spacing:.08em;text-transform:uppercase;padding:0 6px}
.case-rail-item{display:block;width:100%;text-align:left;border:1px solid transparent;background:transparent;
  border-radius:var(--r-sm);padding:11px 12px;margin-bottom:4px;transition:.18s}
.case-rail-item:hover{background:var(--bg)}
.case-rail-item.active{background:var(--blue-soft);border-color:#c6d4f2}
.case-rail-item .ci-no{font-size:11px;font-weight:700;color:var(--faint)}
.case-rail-item.active .ci-no{color:var(--blue)}
.case-rail-item strong{display:block;font-size:13.5px;color:var(--ink);margin:3px 0 5px;line-height:1.45}
.case-rail-item .ci-cat{display:inline-block;font-size:11px;color:#a94e00;background:var(--orange-soft);
  border-radius:99px;padding:2px 8px;font-weight:600}
.case-rail-item .ci-done{color:var(--blue);font-size:11px;font-weight:700;margin-left:6px}
.case-brief,.case-work{padding:26px}
.case-brief h2{font-size:22px;margin:7px 0 8px;color:var(--ink)}
.case-brief>p{color:var(--muted);line-height:1.8;font-size:14px}
.case-tabs{display:none}
.data-table{width:100%;border-collapse:collapse;margin:20px 0;font-size:13px}
.data-table th,.data-table td{text-align:left;border-bottom:1px solid var(--line-soft);padding:11px 9px;color:var(--ink-2)}
.data-table th{background:var(--blue-soft);color:#344b7e;font-weight:700}
.data-table tbody tr:hover{background:#fafcff}
.table-scroll{overflow-x:auto}
.table-scroll .data-table{min-width:480px}
.case-question{border-left:3px solid var(--orange);padding:4px 0 4px 16px;color:#3d4a63;line-height:1.8;font-size:14px;
  background:linear-gradient(90deg,var(--orange-soft),transparent);border-radius:0 6px 6px 0}
.case-work h3{margin:0 0 17px;font-size:17px;color:var(--ink)}
.case-work label{display:block;font-size:13px;font-weight:600;margin:14px 0;color:var(--ink)}
.case-work textarea{min-height:145px}
.case-work textarea.short{min-height:85px}
.checklist{background:var(--bg);border:1px solid var(--line-soft);border-radius:var(--r-sm);padding:14px;margin:16px 0}
.checklist label{display:flex;align-items:flex-start;gap:9px;margin:9px 0;font-weight:400;line-height:1.5;font-size:13px;color:var(--ink-2)}
.checklist input{accent-color:var(--orange);margin-top:3px;width:17px;height:17px}

/* ============================ AI 学习助手 ============================ */
.mode-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:20px}
.mode-tabs button{background:#fff;border:1px solid var(--line);border-radius:99px;padding:9px 16px;
  color:var(--muted);font-size:13px;font-weight:600;transition:.18s}
.mode-tabs button:hover{border-color:#adc0ec;color:var(--blue)}
.mode-tabs button.active{background:var(--blue);color:#fff;border-color:var(--blue)}
.ai-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:20px;align-items:start}
.chat-card{min-height:620px;display:flex;flex-direction:column;overflow:hidden}
.chat-head{padding:19px 22px;border-bottom:1px solid var(--line-soft);display:flex;justify-content:space-between;align-items:center}
.chat-head strong{font-size:15px;color:var(--ink)}
.chat-head span{font-size:12px;color:var(--muted)}
.chat-messages{flex:1;padding:23px;display:flex;flex-direction:column;gap:15px;max-height:520px;overflow:auto;background:#fbfcfe}
.chat-message{max-width:82%;padding:13px 16px;border-radius:var(--r-md);line-height:1.85;font-size:14px;white-space:pre-wrap}
.chat-message.user{background:var(--blue-soft);align-self:flex-end;color:#26386b}
.chat-message.assistant{background:#fff;border:1px solid var(--line);align-self:flex-start;color:var(--ink-2)}
.chat-compose{border-top:1px solid var(--line-soft);padding:17px;display:flex;gap:10px;align-items:flex-end}
.chat-compose textarea{min-height:80px;margin:0}
.chat-compose button{height:46px;flex:none}
.tip-list{padding:24px}
.tip-list h3{margin:0 0 15px;font-size:16px;color:var(--ink)}
.tip-list p{font-size:13px;color:var(--muted);line-height:1.8}
.tip-list button{display:block;width:100%;text-align:left;margin:9px 0;padding:11px 13px;border:1px solid var(--line);
  border-radius:var(--r-sm);color:var(--blue);background:#fbfcff;font-size:13px;line-height:1.5;transition:.18s}
.tip-list button:hover{background:var(--blue-soft);border-color:#c6d4f2}

/* ============================ 提示词资产库 ============================ */
.prompt-layout{display:grid;grid-template-columns:minmax(0,1fr) 380px;gap:20px;align-items:start}
.prompt-list{padding:6px 24px}
.prompt-item{border-bottom:1px solid var(--line-soft);padding:19px 0}
.prompt-item:last-child{border:0}
.prompt-item-head{display:flex;align-items:center;justify-content:space-between;gap:12px}
.prompt-item h3{font-size:15px;margin:0;color:var(--ink)}
.prompt-item p{font-size:13px;line-height:1.7;color:var(--muted);white-space:pre-wrap;overflow-wrap:anywhere;
  max-height:88px;overflow:hidden;margin:9px 0 11px}
.tag{background:var(--orange-soft);color:#a94e00;border-radius:99px;padding:4px 10px;font-size:11px;font-weight:700;white-space:nowrap}
.prompt-actions{display:flex;gap:14px}
.prompt-actions button{background:none;border:0;color:var(--blue);font-size:12px;padding:0;font-weight:600}
.prompt-actions button:hover{text-decoration:underline}
.prompt-form{padding:24px;position:sticky;top:92px}
.prompt-form h3{margin:0 0 17px;font-size:16px;color:var(--ink)}
.prompt-form label{display:block;font-size:13px;font-weight:600;margin:14px 0;color:var(--ink)}
.prompt-form textarea{min-height:150px}

/* ============================ Toast ============================ */
.toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%) translateY(12px);background:var(--ink);
  color:#fff;border-radius:99px;padding:12px 22px;box-shadow:0 14px 34px #18203345;opacity:0;
  pointer-events:none;transition:.22s;z-index:40;font-size:13.5px;font-weight:600}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ============================ 响应式 ============================ */
@media(max-width:1240px){
  .case-layout{grid-template-columns:minmax(0,1fr) minmax(300px,.9fr)}
  .case-rail{grid-column:1/-1;position:static;max-height:none;display:none}
  .case-tabs{display:flex;gap:8px;flex-wrap:nowrap;overflow-x:auto;margin-bottom:18px;padding-bottom:6px}
  .case-tabs button{flex:none;white-space:nowrap;background:#fff;border:1px solid var(--line);border-radius:99px;
    padding:9px 14px;color:var(--muted);font-size:13px;font-weight:600}
  .case-tabs button.active{background:var(--blue);color:#fff;border-color:var(--blue)}
}
@media(max-width:1100px){
  .course-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .two-col,.ai-layout,.prompt-layout,.course-detail{grid-template-columns:1fr}
  .side-info,.prompt-form{position:static}
  .sidebar{width:232px}
  .platform-grid{grid-template-columns:1fr}
  main{padding:28px}
  .topbar{padding:0 28px}
}
@media(max-width:880px){
  .login-page{grid-template-columns:1fr}
  .login-intro{min-height:auto;padding:40px 30px 32px}
  .intro-copy h1{font-size:38px}
  .intro-copy>p:last-child{font-size:14px}
  .login-foot{display:none}
  .login-panel{padding:26px;min-height:auto}
  .sidebar{position:fixed;left:0;top:0;z-index:30;transform:translateX(-100%);transition:transform .22s;width:270px}
  .sidebar.open{transform:translateX(0)}
  .mobile-only{display:block}
  .side-top{display:flex;justify-content:space-between;padding:0 15px 32px}
  .topbar{height:60px;padding:0 18px;justify-content:flex-start;gap:14px}
  .top-right{margin-left:auto}
  .top-progress{display:none}
  main{padding:22px 18px 60px}
  .page-heading h1{font-size:25px}
  .dashboard-banner{padding:26px;flex-direction:column;align-items:flex-start;min-height:auto}
  .banner-stat{align-self:flex-start}
  .stats-grid{grid-template-columns:1fr;gap:10px}
  .course-grid{grid-template-columns:1fr}
  .course-card{min-height:220px}
  .case-brief,.case-work,.detail-panel{padding:20px}
  .chat-message{max-width:92%}
  .chat-compose{flex-direction:column;align-items:stretch}
  .chat-compose button{width:100%}
  .platform-note-actions{flex-direction:column;align-items:stretch}
  .platform-note-actions .primary{align-self:flex-start}
  .general-module-head{flex-wrap:wrap}
  .module-check{margin-left:51px}
  .track summary{align-items:flex-start;flex-direction:column;gap:2px}
  .track summary span{text-align:left;margin-left:0;padding-right:0}
}