/* ===== 基础重置与变量 ===== */
* { margin:0; padding:0; box-sizing:border-box; }
:root{
  --bg:#0e1024;
  --bg-2:#161a36;
  --card:#1d2148;
  --card-2:#252a55;
  --line:rgba(255,255,255,.08);
  --text:#eef0ff;
  --text-dim:#a9aece;
  --primary:#7c5cff;
  --primary-2:#5a8bff;
  --accent:#22d3ee;
  --success:#34d399;
  --warn:#fbbf24;
  --danger:#fb7185;
  --radius:16px;
  --shadow:0 10px 30px rgba(0,0,0,.35);
}
html,body{height:100%;}
body{
  font-family:"PingFang SC","Microsoft YaHei","Segoe UI",system-ui,sans-serif;
  background:radial-gradient(1200px 600px at 80% -10%,rgba(124,92,255,.25),transparent),
             radial-gradient(900px 500px at 0% 100%,rgba(90,139,255,.18),transparent),
             var(--bg);
  color:var(--text);
  min-height:100vh;
  line-height:1.6;
}
a{cursor:pointer;color:inherit;text-decoration:none;}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit;}
input,textarea{font-family:inherit;}
img{max-width:100%;display:block;}

/* ===== 通用按钮 ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  padding:10px 18px;border-radius:10px;font-size:14px;font-weight:600;
  transition:transform .15s,box-shadow .15s,background .2s,opacity .2s;
}
.btn:active{transform:translateY(1px);}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;box-shadow:0 6px 18px rgba(124,92,255,.4);}
.btn-primary:hover{box-shadow:0 8px 22px rgba(124,92,255,.55);}
.btn-ghost{background:rgba(255,255,255,.06);color:var(--text);}
.btn-ghost:hover{background:rgba(255,255,255,.12);}
.btn-block{width:100%;}
.btn-sm{padding:6px 12px;font-size:13px;border-radius:8px;}
.btn:disabled{opacity:.5;cursor:not-allowed;}

/* ===== 视图切换 ===== */
.view{display:none;animation:fade .35s ease;}
.view.active{display:block;}
@keyframes fade{from{opacity:0;transform:translateY(8px);}to{opacity:1;transform:none;}}

/* ===== 登录/注册 ===== */
#view-auth{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;position:relative;overflow:hidden;}
.auth-bg{position:absolute;inset:0;z-index:0;}
.auth-orbs{position:relative;width:100%;height:100%;}
.auth-orbs span{position:absolute;border-radius:50%;filter:blur(60px);opacity:.55;animation:float 9s ease-in-out infinite;}
.auth-orbs span:nth-child(1){width:340px;height:340px;background:#7c5cff;left:-80px;top:-60px;}
.auth-orbs span:nth-child(2){width:280px;height:280px;background:#22d3ee;right:-60px;top:30%;animation-delay:-3s;}
.auth-orbs span:nth-child(3){width:300px;height:300px;background:#5a8bff;left:35%;bottom:-100px;animation-delay:-6s;}
@keyframes float{0%,100%{transform:translateY(0) scale(1);}50%{transform:translateY(-30px) scale(1.08);}}
.auth-card{
  position:relative;z-index:1;width:100%;max-width:420px;
  background:rgba(29,33,72,.7);backdrop-filter:blur(14px);
  border:1px solid var(--line);border-radius:20px;padding:32px;box-shadow:var(--shadow);
}
.brand{display:flex;align-items:center;gap:14px;margin-bottom:22px;}
.brand-logo{
  width:48px;height:48px;border-radius:14px;flex-shrink:0;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  display:flex;align-items:center;justify-content:center;
  font-size:24px;font-weight:800;color:#fff;box-shadow:0 6px 18px rgba(124,92,255,.5);
}
.brand-text h1{font-size:22px;letter-spacing:1px;}
.brand-text p{color:var(--text-dim);font-size:13px;}
.auth-tabs{display:flex;gap:8px;background:rgba(255,255,255,.05);padding:5px;border-radius:12px;margin-bottom:20px;}
.auth-tab{flex:1;padding:9px;border-radius:8px;color:var(--text-dim);font-weight:600;font-size:14px;transition:.2s;}
.auth-tab.active{background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;}
.auth-form .form-row{margin-bottom:14px;}
.auth-form label{display:block;font-size:13px;color:var(--text-dim);margin-bottom:6px;}
.auth-form input{
  width:100%;padding:11px 14px;border-radius:10px;
  background:rgba(255,255,255,.06);border:1px solid var(--line);
  color:var(--text);font-size:14px;transition:.2s;
}
.auth-form input:focus{outline:none;border-color:var(--primary);background:rgba(255,255,255,.1);}
.form-error{color:var(--danger);font-size:13px;min-height:18px;margin-bottom:8px;}
.auth-hint{margin-top:14px;text-align:center;color:var(--text-dim);font-size:13px;}

/* ===== 顶部导航 ===== */
.topbar{position:sticky;top:0;z-index:50;background:rgba(14,16,36,.75);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);}
.topbar-inner{max-width:1180px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;gap:20px;}
.brand-sm{display:flex;align-items:center;gap:10px;cursor:pointer;}
.brand-sm .brand-logo{width:34px;height:34px;font-size:18px;border-radius:10px;}
.brand-sm span{font-size:18px;font-weight:700;}
.topnav{display:flex;gap:6px;flex:1;margin-left:10px;}
.topnav a{padding:8px 14px;border-radius:8px;color:var(--text-dim);font-size:14px;font-weight:500;transition:.2s;}
.topnav a:hover{color:var(--text);background:rgba(255,255,255,.06);}
.topnav a.active{color:#fff;background:rgba(124,92,255,.25);}
.user-menu{display:flex;align-items:center;gap:10px;}
.user-greeting{font-size:13px;color:var(--text-dim);}

/* ===== 主容器 ===== */
.container{max-width:1180px;margin:0 auto;padding:24px 20px 60px;}

/* ===== 首页 hero ===== */
.hero{
  background:linear-gradient(135deg,rgba(124,92,255,.25),rgba(34,211,238,.12));
  border:1px solid var(--line);border-radius:20px;padding:28px;margin-bottom:28px;
  display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap;
}
.hero-text h2{font-size:24px;margin-bottom:6px;}
.hero-text p{color:var(--text-dim);}
.hero-stats{display:flex;gap:18px;}
.hero-stat{text-align:center;}
.hero-stat .num{font-size:24px;font-weight:800;background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;background-clip:text;color:transparent;}
.hero-stat .lbl{font-size:12px;color:var(--text-dim);}

/* ===== 区块标题 ===== */
.section-head{display:flex;align-items:center;justify-content:space-between;margin:24px 0 14px;gap:12px;flex-wrap:wrap;}
.section-head h3{font-size:18px;}
.section-sub{color:var(--text-dim);font-size:13px;}
.page-title{font-size:22px;margin-bottom:6px;}
.page-sub{color:var(--text-dim);margin-bottom:20px;}
.block-title{font-size:16px;margin:24px 0 12px;}

/* ===== 语言切换 ===== */
.lang-tabs{display:flex;gap:8px;}
.lang-tab{
  padding:8px 16px;border-radius:20px;font-size:13px;font-weight:600;
  background:rgba(255,255,255,.06);color:var(--text-dim);transition:.2s;
}
.lang-tab.active{background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;}

/* ===== 课程卡片 ===== */
.course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;}
.course-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px;transition:.2s;cursor:pointer;position:relative;overflow:hidden;
}
.course-card:hover{transform:translateY(-3px);border-color:rgba(124,92,255,.5);box-shadow:var(--shadow);}
.course-card .level-tag{
  display:inline-block;padding:3px 10px;border-radius:12px;font-size:11px;font-weight:600;margin-bottom:10px;
}
.lv-1{background:rgba(52,211,153,.18);color:var(--success);}
.lv-2{background:rgba(251,191,36,.18);color:var(--warn);}
.lv-3{background:rgba(251,113,133,.18);color:var(--danger);}
.course-card h4{font-size:16px;margin-bottom:6px;}
.course-card .desc{color:var(--text-dim);font-size:13px;margin-bottom:12px;}
.course-card .meta{display:flex;gap:14px;font-size:12px;color:var(--text-dim);}
.course-card .meta span::before{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--accent);margin-right:5px;vertical-align:middle;}
.course-card .done-mark{position:absolute;top:14px;right:14px;color:var(--success);font-size:13px;font-weight:700;background:rgba(52,211,153,.15);padding:3px 8px;border-radius:10px;}

/* ===== 推荐框 ===== */
.recommend-box{
  background:linear-gradient(135deg,rgba(124,92,255,.18),rgba(34,211,238,.08));
  border:1px solid var(--line);border-radius:var(--radius);padding:18px;
}
.recommend-box .rec-title{font-weight:700;margin-bottom:6px;}
.recommend-box .rec-desc{color:var(--text-dim);font-size:13px;margin-bottom:12px;}
.recommend-box .rec-actions{display:flex;gap:10px;flex-wrap:wrap;}

/* ===== 课程详情 ===== */
.course-detail{margin-top:16px;}
.cd-head{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;margin-bottom:18px;}
.cd-head .tag{margin-bottom:8px;}
.cd-head h2{font-size:22px;margin-bottom:6px;}
.cd-head .info{color:var(--text-dim);font-size:13px;margin-bottom:14px;}
.module-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;}
.module-card{
  background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;cursor:pointer;transition:.2s;
  display:flex;flex-direction:column;gap:8px;
}
.module-card:hover{transform:translateY(-3px);border-color:var(--primary);}
.module-card .m-icon{font-size:26px;}
.module-card .m-title{font-weight:700;font-size:15px;}
.module-card .m-desc{color:var(--text-dim);font-size:13px;flex:1;}
.module-card .m-btn{color:var(--primary);font-size:13px;font-weight:600;}

/* ===== 学习模块通用 ===== */
.module-wrap{max-width:760px;margin:0 auto;}
.module-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px;gap:12px;}
.module-head .m-title{font-size:18px;}
.progress-bar{height:8px;background:rgba(255,255,255,.08);border-radius:6px;overflow:hidden;margin-bottom:18px;}
.progress-bar span{display:block;height:100%;background:linear-gradient(90deg,var(--primary),var(--accent));transition:width .3s;}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);}

/* 单词卡 */
.word-card{
  text-align:center;padding:36px 24px;min-height:260px;
  display:flex;flex-direction:column;justify-content:center;align-items:center;gap:10px;
  cursor:pointer;transition:.3s;
}
.word-card.flipped{background:linear-gradient(135deg,rgba(124,92,255,.15),rgba(34,211,238,.08));}
.word-card .w-word{font-size:34px;font-weight:800;letter-spacing:1px;}
.word-card .w-phonetic{color:var(--accent);font-size:16px;}
.word-card .w-meaning{font-size:20px;color:var(--warn);}
.word-card .w-example{color:var(--text-dim);font-size:14px;margin-top:8px;font-style:italic;}
.word-tip{color:var(--text-dim);font-size:13px;text-align:center;margin-top:12px;}

/* 语法/听力 选择题 */
.quiz-question{font-size:16px;margin-bottom:16px;line-height:1.7;}
.quiz-options{display:flex;flex-direction:column;gap:10px;}
.quiz-opt{
  text-align:left;padding:13px 16px;border-radius:10px;
  background:rgba(255,255,255,.05);border:1px solid var(--line);
  transition:.2s;font-size:14px;
}
.quiz-opt:hover{background:rgba(255,255,255,.1);border-color:var(--primary);}
.quiz-opt.correct{background:rgba(52,211,153,.18);border-color:var(--success);color:var(--success);}
.quiz-opt.wrong{background:rgba(251,113,133,.18);border-color:var(--danger);color:var(--danger);}
.quiz-opt:disabled{cursor:default;}
.quiz-explain{margin-top:14px;padding:12px 14px;background:rgba(34,211,238,.08);border-left:3px solid var(--accent);border-radius:8px;font-size:13px;color:var(--text-dim);}
.quiz-result{text-align:center;padding:20px;}
.quiz-result .score{font-size:32px;font-weight:800;background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;background-clip:text;color:transparent;}
.quiz-foot{display:flex;justify-content:space-between;margin-top:18px;gap:10px;}

/* 口语跟读 */
.speak-sentence{font-size:22px;text-align:center;font-weight:700;margin:10px 0;}
.speak-phonetic{text-align:center;color:var(--accent);margin-bottom:16px;}
.speak-translation{text-align:center;color:var(--text-dim);margin-bottom:18px;}
.speak-hint{padding:10px 14px;background:rgba(251,191,36,.1);border-left:3px solid var(--warn);border-radius:8px;font-size:13px;color:var(--text-dim);margin-top:14px;}

/* 听力 */
.listen-script{background:rgba(255,255,255,.04);border-radius:10px;padding:14px;margin-bottom:16px;font-size:14px;color:var(--text-dim);line-height:1.8;border-left:3px solid var(--accent);}

/* ===== 进度页 ===== */
.progress-overview{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:14px;margin-bottom:8px;}
.stat-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;text-align:center;}
.stat-card .num{font-size:28px;font-weight:800;background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;background-clip:text;color:transparent;}
.stat-card .lbl{color:var(--text-dim);font-size:13px;margin-top:4px;}
.lang-progress-list{display:flex;flex-direction:column;gap:12px;}
.lang-progress-item{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px;}
.lang-progress-item .lp-head{display:flex;justify-content:space-between;margin-bottom:8px;font-size:14px;}
.lang-progress-item .lp-bar{height:8px;background:rgba(255,255,255,.08);border-radius:6px;overflow:hidden;}
.lang-progress-item .lp-bar span{display:block;height:100%;background:linear-gradient(90deg,var(--primary),var(--accent));}
.recent-list{display:flex;flex-direction:column;gap:8px;}
.recent-item{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:12px 14px;display:flex;justify-content:space-between;align-items:center;font-size:14px;}
.recent-item .r-left{display:flex;align-items:center;gap:10px;}
.recent-item .r-score{font-weight:700;color:var(--success);}
.recent-item .r-date{color:var(--text-dim);font-size:12px;}
.empty-hint{color:var(--text-dim);text-align:center;padding:30px;font-size:14px;}

/* ===== 成就 ===== */
.achievement-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:14px;}
.ach-card{
  background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;text-align:center;transition:.2s;
}
.ach-card.unlocked{border-color:var(--warn);background:linear-gradient(135deg,rgba(251,191,36,.12),rgba(124,92,255,.08));}
.ach-card.locked{opacity:.45;filter:grayscale(.6);}
.ach-icon{font-size:34px;margin-bottom:8px;}
.ach-name{font-weight:700;font-size:14px;margin-bottom:4px;}
.ach-desc{color:var(--text-dim);font-size:12px;}

/* ===== 社区 ===== */
.community-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;}
.post-form{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px;margin-bottom:16px;}
.post-form input,.post-form textarea{
  width:100%;padding:11px 14px;border-radius:10px;background:rgba(255,255,255,.06);
  border:1px solid var(--line);color:var(--text);font-size:14px;margin-bottom:10px;resize:vertical;
}
.post-form input:focus,.post-form textarea:focus{outline:none;border-color:var(--primary);}
.post-form-actions{display:flex;justify-content:flex-end;gap:8px;}
.post-list{display:flex;flex-direction:column;gap:14px;}
.post-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;}
.post-card .p-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;}
.post-card .p-author{font-weight:700;color:var(--accent);}
.post-card .p-date{color:var(--text-dim);font-size:12px;}
.post-card .p-title{font-size:17px;font-weight:700;margin-bottom:6px;}
.post-card .p-content{color:var(--text-dim);font-size:14px;white-space:pre-wrap;}
.post-card .p-foot{margin-top:12px;font-size:13px;color:var(--text-dim);}
.reply-list{margin-top:12px;padding-left:14px;border-left:2px solid var(--line);}
.reply-item{font-size:13px;margin-bottom:6px;}
.reply-item .r-author{color:var(--accent);font-weight:600;margin-right:6px;}
.reply-form{display:flex;gap:8px;margin-top:12px;}
.reply-form input{flex:1;padding:9px 12px;border-radius:8px;background:rgba(255,255,255,.06);border:1px solid var(--line);color:var(--text);font-size:13px;}
.reply-form input:focus{outline:none;border-color:var(--primary);}

/* ===== 提示 toast ===== */
.toast{
  position:fixed;bottom:30px;left:50%;transform:translateX(-50%) translateY(80px);
  background:rgba(29,33,72,.95);border:1px solid var(--line);color:var(--text);
  padding:12px 22px;border-radius:30px;font-size:14px;box-shadow:var(--shadow);
  opacity:0;transition:.35s;z-index:1000;pointer-events:none;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0);}

/* ===== 页脚 ===== */
.footer{text-align:center;color:var(--text-dim);font-size:12px;padding:24px 20px;border-top:1px solid var(--line);margin-top:40px;}

/* ===== 响应式 ===== */
@media (max-width:720px){
  .topbar-inner{flex-wrap:wrap;gap:10px;}
  .topnav{order:3;width:100%;justify-content:space-around;}
  .user-menu{margin-left:auto;}
  .hero{flex-direction:column;align-items:flex-start;}
  .brand-text h1{font-size:18px;}
  .word-card .w-word{font-size:26px;}
}

/* ===== 词库管理 ===== */
.wb-section{
  background:var(--card);border:1px solid var(--line);border-radius:14px;
  padding:18px 22px;margin-bottom:18px;
}
.wb-form{display:flex;flex-wrap:wrap;gap:16px;align-items:flex-end;}
.wb-row{display:flex;flex-direction:column;gap:6px;}
.wb-row label{font-size:13px;color:var(--text-dim);}
.wb-row select,.wb-row input[type="file"]{
  background:var(--bg);border:1px solid var(--line);color:var(--text);
  padding:8px 12px;border-radius:8px;font-size:14px;min-width:180px;
}
.wb-row select:focus,.wb-row input:focus{outline:none;border-color:var(--primary);}

.wb-table{width:100%;border-collapse:collapse;font-size:14px;}
.wb-table th,.wb-table td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line);}
.wb-table th{color:var(--text-dim);font-weight:600;font-size:13px;}
.wb-count{color:var(--primary);font-weight:600;}
.wb-empty{color:var(--text-dim);font-size:13px;}
.wb-table.wb-mini th,.wb-table.wb-mini td{padding:6px 10px;font-size:13px;}

.wb-preview{margin-top:14px;}
.wb-preview-box{
  background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:14px 16px;
}
.wb-preview-info{font-size:14px;margin-bottom:10px;color:var(--text);}
.wb-preview-stat{margin-left:10px;color:var(--text-dim);font-size:13px;}
.wb-more{color:var(--text-dim);font-size:13px;margin-top:6px;}
.wb-preview-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:12px;}

.wb-help{font-size:13px;color:var(--text-dim);line-height:1.8;}
.wb-help b{color:var(--text);}
.wb-help code{background:var(--bg);border:1px solid var(--line);border-radius:4px;padding:1px 6px;font-family:Consolas,monospace;color:var(--primary);}
.wb-pre{
  background:var(--bg);border:1px solid var(--line);border-radius:8px;
  padding:10px 14px;margin:8px 0;font-size:12px;color:var(--text);
  font-family:Consolas,monospace;overflow-x:auto;white-space:pre;
}
.wb-tpl-actions{display:flex;align-items:center;gap:12px;margin-top:12px;flex-wrap:wrap;}
.wb-tpl-hint{font-size:12px;color:var(--text-dim);}

/* 单词卡来源标签 */
.wb-source-tag{
  display:inline-block;background:rgba(108,92,231,.15);color:var(--primary);
  border:1px solid rgba(108,92,231,.3);border-radius:10px;
  padding:1px 8px;font-size:11px;margin-right:6px;
}
.wb-source-tag.demo{
  background:rgba(150,160,180,.12);color:var(--text-dim);
  border-color:var(--line);
}