/* =====================================================================
 * styles.css — 每日英语学习站
 * 品牌：翠绿 #10b981 / #34d399 → 天蓝 #0ea5e9 渐变，移动优先
 * ===================================================================== */
:root{
  --green:#10b981;
  --green-light:#34d399;
  --green-soft:#d1fae5;
  --green-bg:#ecfdf5;
  --sky:#0ea5e9;
  --sky-soft:#e0f2fe;
  --ink:#0f172a;
  --text:#1f2937;
  --text-2:#64748b;
  --text-3:#94a3b8;
  --line:#e8edf2;
  --bg:#f4f7f9;
  --card:#ffffff;
  --warn:#f59e0b;
  --warn-bg:#fff7ed;
  --red:#ef4444;
  --red-bg:#fef2f2;
  --radius:18px;
  --radius-sm:12px;
  --shadow:0 6px 22px rgba(16,185,129,.10);
  --shadow-sm:0 2px 10px rgba(15,23,42,.06);
  --brand-grad:linear-gradient(135deg,#34d399 0%,#10b981 45%,#0ea5e9 100%);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Noto Sans",
    "PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;
  background:var(--bg);color:var(--text);line-height:1.55;
  -webkit-font-smoothing:antialiased;font-size:15px;
}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
input,textarea{font-family:inherit;font-size:15px}
.form{display:block}
.form label{display:block;font-size:13px;font-weight:600;color:#334155;margin-bottom:6px}
.form input[type=text],.form input:not([type=checkbox]){width:100%;box-sizing:border-box;padding:10px 12px;border:1px solid #d8dee9;border-radius:10px;background:#fff;color:#0f172a;margin-bottom:2px}
.form input:focus{outline:none;border-color:var(--theme,#10b981);box-shadow:0 0 0 3px rgba(16,185,129,.15)}
.form small{display:block;font-size:12px;line-height:1.5;margin-bottom:4px}
.switch-row input{width:18px;height:18px;accent-color:var(--theme,#10b981)}
.hidden{display:none !important}

#app{max-width:480px;margin:0 auto;min-height:100vh;background:var(--bg);
  display:flex;flex-direction:column;position:relative;
  box-shadow:0 0 40px rgba(15,23,42,.06)}

/* ---------- 顶部栏 ---------- */
.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;
  justify-content:space-between;padding:14px 16px;background:var(--card);
  border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px}
.logo{width:38px;height:38px;border-radius:11px;background:var(--brand-grad);
  color:#fff;font-family:Georgia,"Times New Roman",serif;font-weight:700;
  font-size:19px;display:flex;align-items:center;justify-content:center;
  box-shadow:0 4px 12px rgba(16,185,129,.35)}
.brand-text{display:flex;flex-direction:column;line-height:1.2}
.brand-text strong{font-size:16px}
.brand-text small{color:var(--text-3);font-size:11px}
.icon-btn{width:38px;height:38px;border-radius:11px;background:var(--green-bg);
  font-size:17px;display:flex;align-items:center;justify-content:center;
  transition:.15s}
.icon-btn:active{transform:scale(.92)}

/* ---------- 内容区 ---------- */
.content{flex:1;padding:16px 16px 96px;overflow-y:auto}

/* ---------- 卡片 ---------- */
.card{background:var(--card);border-radius:var(--radius);padding:16px;
  box-shadow:var(--shadow-sm);margin-bottom:14px;border:1px solid #f1f5f9}
.card-title{display:flex;align-items:center;justify-content:space-between;
  margin-bottom:10px}
.card-title h3{margin:0;font-size:15px}
.muted{color:var(--text-2);font-size:13px}

/* ---------- 今日头部 ---------- */
.today-hero{background:var(--brand-grad);border-radius:var(--radius);
  padding:20px 18px;color:#fff;margin-bottom:16px;box-shadow:var(--shadow);
  position:relative;overflow:hidden}
.today-hero::after{content:"";position:absolute;right:-30px;top:-30px;
  width:120px;height:120px;background:rgba(255,255,255,.12);border-radius:50%}
.today-hero .date-big{font-size:26px;font-weight:700;letter-spacing:.5px}
.today-hero .date-sub{opacity:.92;font-size:13px;margin-top:2px}
.today-hero .streak{margin-top:14px;display:inline-flex;align-items:center;
  gap:6px;background:rgba(255,255,255,.2);padding:5px 12px;border-radius:999px;
  font-size:13px}

/* ---------- 今日三块 ---------- */
.tile{display:flex;align-items:center;gap:12px;padding:14px;
  border-radius:var(--radius-sm);background:var(--card);margin-bottom:10px;
  box-shadow:var(--shadow-sm);border:1px solid #f1f5f9;width:100%;text-align:left;
  transition:.15s}
.tile:active{transform:scale(.99)}
.tile .ic{width:42px;height:42px;border-radius:12px;display:flex;
  align-items:center;justify-content:center;font-size:20px;flex-shrink:0}
.tile .ic.g{background:var(--green-bg)}
.tile .ic.b{background:var(--sky-soft)}
.tile .ic.w{background:var(--warn-bg)}
.tile .meta{flex:1;min-width:0}
.tile .meta b{font-size:15px;display:block}
.tile .meta small{color:var(--text-2);font-size:12.5px}
.tile .arrow{color:var(--text-3);font-size:18px}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;
  padding:12px 16px;border-radius:12px;font-size:15px;font-weight:600;
  background:var(--brand-grad);color:#fff;box-shadow:var(--shadow);
  transition:.15s;width:100%}
.btn:active{transform:scale(.98)}
.btn.ghost{background:var(--green-bg);color:var(--green);box-shadow:none}
.btn.sky{background:var(--sky);box-shadow:0 6px 18px rgba(14,165,233,.25)}
.btn:disabled{opacity:.5;pointer-events:none}
.btn.sm{padding:8px 12px;font-size:13px;width:auto}

/* ---------- 单词卡 ---------- */
.word{border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:14px;margin-bottom:10px;background:var(--card)}
.word-top{display:flex;align-items:baseline;gap:8px;flex-wrap:wrap}
.word-top .w{font-size:18px;font-weight:700;color:var(--ink)}
.word-top .ipa{color:var(--sky);font-size:13px}
.word-top .pos{color:var(--text-3);font-size:12px}
.word-top .zh{color:var(--text);font-size:14px;margin-left:auto}
.word .ex{margin-top:8px;font-size:13.5px;color:var(--text-2);
  border-left:3px solid var(--green-light);padding-left:10px}
.word .ex .src{display:inline-block;font-size:11px;color:var(--green);
  background:var(--green-bg);border-radius:6px;padding:1px 6px;margin-right:6px}
.word .ex .exzh{color:var(--text-3);font-size:12px;display:block;margin-top:2px}
.speak{width:30px;height:30px;border-radius:50%;background:var(--sky-soft);
  color:var(--sky);font-size:14px;display:inline-flex;align-items:center;
  justify-content:center;flex-shrink:0}
.speak:active{transform:scale(.9)}

/* ---------- 标签 ---------- */
.tag{display:inline-block;font-size:11px;padding:2px 8px;border-radius:999px;
  background:var(--green-bg);color:var(--green);margin-right:4px}
.tag.sky{background:var(--sky-soft);color:var(--sky)}

/* ---------- 进度 / 评分条 ---------- */
.bars{display:flex;flex-direction:column;gap:10px;margin-top:6px}
.bar-row{display:flex;align-items:center;gap:10px;font-size:13px}
.bar-row .lab{width:54px;color:var(--text-2);flex-shrink:0}
.bar-track{flex:1;height:9px;background:#eef2f6;border-radius:999px;overflow:hidden}
.bar-fill{height:100%;border-radius:999px;background:var(--brand-grad);
  transition:width .6s ease}
.bar-row .val{width:34px;text-align:right;color:var(--text);font-weight:600}

/* ---------- 底部导航 ---------- */
.tabbar{position:fixed;bottom:0;left:50%;transform:translateX(-50%);
  width:100%;max-width:480px;display:flex;background:var(--card);
  border-top:1px solid var(--line);padding:6px 0;z-index:30;
  padding-bottom:calc(6px + env(safe-area-inset-bottom))}
.tab{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;
  font-size:11px;color:var(--text-3);padding:6px 0;transition:.15s}
.tab span{font-size:19px;display:block;filter:grayscale(.4)}
.tab.active{color:var(--green)}
.tab.active span{filter:none;transform:translateY(-1px)}

/* ---------- 弹层 sheet ---------- */
.sheet-mask{position:fixed;inset:0;background:rgba(15,23,42,.45);z-index:40}
.sheet{position:fixed;left:50%;bottom:0;transform:translateX(-50%);
  width:100%;max-width:480px;max-height:88vh;background:var(--bg);
  border-radius:22px 22px 0 0;z-index:50;display:flex;flex-direction:column;
  animation:slideUp .25s ease;padding-bottom:env(safe-area-inset-bottom)}
@keyframes slideUp{from{transform:translate(-50%,100%)}to{transform:translateX(-50%)}}
.sheet-head{display:flex;align-items:center;justify-content:space-between;
  padding:16px;border-bottom:1px solid var(--line);background:var(--card);
  border-radius:22px 22px 0 0;position:sticky;top:0}
.sheet-head strong{font-size:16px}
.sheet-body{padding:16px;overflow-y:auto}

/* ---------- 测验 ---------- */
.quiz-progress{display:flex;justify-content:space-between;align-items:center;
  font-size:13px;color:var(--text-2);margin-bottom:12px}
.q-card{background:var(--card);border-radius:var(--radius);padding:18px;
  box-shadow:var(--shadow-sm);margin-bottom:14px}
.q-type{display:inline-block;font-size:11px;padding:2px 9px;border-radius:999px;
  background:var(--green-bg);color:var(--green);margin-bottom:10px}
.q-stem{font-size:16px;color:var(--ink);margin-bottom:14px;line-height:1.6}
.q-stem .blank{display:inline-block;min-width:90px;border-bottom:2px solid var(--green);
  color:var(--green);text-align:center;margin:0 4px;font-weight:600}
.q-opt{display:block;width:100%;text-align:left;padding:12px 14px;
  border:1.5px solid var(--line);border-radius:12px;margin-bottom:10px;
  background:var(--card);font-size:15px;transition:.15s}
.q-opt:active{transform:scale(.99)}
.q-opt.correct{border-color:var(--green);background:var(--green-bg)}
.q-opt.wrong{border-color:var(--red);background:var(--red-bg)}
.q-opt.chosen{border-color:var(--sky);background:var(--sky-soft)}
textarea.q-input{width:100%;min-height:90px;border:1.5px solid var(--line);
  border-radius:12px;padding:12px;resize:vertical;background:var(--card);
  color:var(--text);line-height:1.6}
textarea.q-input:focus{outline:none;border-color:var(--green)}
.fill-input{width:120px;border:1.5px solid var(--line);border-radius:10px;
  padding:8px 10px;text-align:center;font-weight:600}
.fill-input:focus{outline:none;border-color:var(--green)}
.mic-btn{width:72px;height:72px;border-radius:50%;background:var(--brand-grad);
  color:#fff;font-size:28px;display:flex;align-items:center;justify-content:center;
  margin:14px auto;box-shadow:var(--shadow);transition:.15s}
.mic-btn:active{transform:scale(.94)}
.mic-btn.recording{animation:pulse 1.1s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(16,185,129,.5)}
  70%{box-shadow:0 0 0 18px rgba(16,185,129,0)}100%{box-shadow:0 0 0 0 rgba(16,185,129,0)}}
.rec-result{background:var(--sky-soft);border-radius:12px;padding:12px;
  font-size:14px;color:var(--ink);margin-top:10px;min-height:20px}
.speed-toggle{display:flex;align-items:center;gap:8px;margin-bottom:10px}
.speed-toggle .muted{font-size:12px}
.spd{border:1px solid var(--line);background:var(--card);color:var(--text-2);
  border-radius:20px;padding:5px 14px;font-size:13px;cursor:pointer;
  transition:.15s}
.spd.active{background:var(--green);color:#fff;border-color:var(--green);
  font-weight:600}
.opt-tag{display:inline-block;font-size:11px;font-weight:600;color:var(--green);
  background:var(--green-soft);border-radius:8px;padding:1px 7px;margin-left:6px;vertical-align:middle}
.q-actions{display:flex;gap:10px;margin-top:12px;align-items:center}
.q-actions .btn{flex:1}
.score-pill.skip{background:#eef2f7;color:#6b7280}
.partner-bubble,.learner-bubble{max-width:82%;padding:10px 13px;border-radius:14px;
  margin-bottom:8px;font-size:14px;line-height:1.5}
.partner-bubble{background:var(--card);border:1px solid var(--line);
  border-bottom-left-radius:4px;align-self:flex-start}
.learner-bubble{background:var(--green-bg);color:var(--ink);
  border-bottom-right-radius:4px;align-self:flex-end;margin-left:auto}
.dlg-box{display:flex;flex-direction:column}
.score-pill{display:inline-flex;align-items:center;gap:4px;font-weight:700;
  padding:4px 12px;border-radius:999px;background:var(--green-bg);color:var(--green)}
.score-pill.low{background:var(--red-bg);color:var(--red)}

/* ---------- 语料库搜索 ---------- */
.search-bar{display:flex;gap:8px;margin-bottom:14px}
.search-bar input{flex:1;border:1.5px solid var(--line);border-radius:12px;
  padding:11px 14px;background:var(--card)}
.search-bar input:focus{outline:none;border-color:var(--green)}
.chip-row{display:flex;gap:8px;overflow-x:auto;padding-bottom:4px;margin-bottom:12px}
.chip{flex-shrink:0;padding:7px 13px;border-radius:999px;background:var(--card);
  border:1px solid var(--line);font-size:13px;color:var(--text-2);white-space:nowrap}
.chip.active{background:var(--brand-grad);color:#fff;border-color:transparent}

/* ---------- 错题复习 ---------- */
.review-item{border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:13px;margin-bottom:10px;background:var(--card)}
.review-item .due{font-size:12px;color:var(--warn);margin-top:4px}
.review-item.done .due{color:var(--green)}

/* ---------- 档案 ---------- */
.archive-day{border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:13px;margin-bottom:9px;background:var(--card);display:flex;
  align-items:center;gap:10px}
.archive-day .d{font-weight:600}
.archive-day .cnt{color:var(--text-2);font-size:13px;margin-left:auto}
.empty{text-align:center;color:var(--text-3);padding:40px 20px;font-size:14px}
.empty .em{font-size:40px;display:block;margin-bottom:10px}

/* ---------- 总结报告 ---------- */
.report h2{font-size:20px;margin:0 0 4px}
.report .sub{color:var(--text-2);font-size:13px;margin-bottom:16px}
.stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:16px}
.stat{background:var(--card);border-radius:var(--radius-sm);padding:14px;
  border:1px solid #f1f5f9;text-align:center}
.stat .n{font-size:24px;font-weight:700;color:var(--green)}
.stat .l{font-size:12px;color:var(--text-2);margin-top:2px}

/* ---------- 提示 ---------- */
.toast{position:fixed;left:50%;top:70px;transform:translateX(-50%);
  background:rgba(15,23,42,.92);color:#fff;padding:10px 18px;border-radius:12px;
  font-size:14px;z-index:99;max-width:90%;text-align:center;box-shadow:var(--shadow)}
.toast:not(.hidden){animation:fadeIn .2s}
@keyframes fadeIn{from{opacity:0;transform:transl(-50%,-6px)}to{opacity:1}}

/* ---------- 今日示例文章 ---------- */
.article-card{border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:14px;margin-bottom:12px;background:var(--card)}
.article-body{font-size:14px;color:var(--text);line-height:1.7;white-space:normal;
  background:var(--green-bg);border-radius:12px;padding:12px 14px;margin-bottom:10px}
.hl-word{color:var(--green);font-weight:700;background:rgba(16,185,129,.16);
  border-radius:5px;padding:0 3px;cursor:pointer}
.hl-word:active{background:rgba(16,185,129,.3)}
.speak.wide{width:100%;border-radius:10px;background:var(--sky-soft);color:var(--sky);
  font-size:13px;padding:8px;margin-bottom:8px;display:flex;align-items:center;
  justify-content:center;gap:6px}
.speak.wide:active{transform:scale(.98)}
.article-zh{margin-top:4px}
.article-zh summary{cursor:pointer;color:var(--text-2);font-size:13px;
  padding:4px 0;user-select:none}
.article-zh[open] summary{margin-bottom:6px}
.article-zh{font-size:13px;color:var(--text-2);line-height:1.7}

/* ---------- 地道高频表达 ---------- */
.common-card{border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:12px 14px;margin-bottom:10px;background:var(--card)}
.common-en{font-size:15px;color:var(--ink);font-weight:600;display:flex;
  align-items:center;gap:8px}
.common-en .speak{width:26px;height:26px;font-size:12px}
.common-zh{color:var(--text-2);font-size:13px;margin-top:4px}

/* ---------- 艾宾浩斯曲线条 ---------- */
.eb-line{margin:8px 0 0;font-size:12.5px;color:#0369a1;font-weight:600;
  background:#fff;border-radius:10px;padding:8px 10px;line-height:1.5}

/* 加载 */
.loading{text-align:center;color:var(--text-3);padding:30px;font-size:14px}
.spinner{width:26px;height:26px;border:3px solid var(--green-soft);
  border-top-color:var(--green);border-radius:50%;margin:0 auto 10px;
  animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- 听说读写训练 ---------- */
.skill-head{display:flex;align-items:center;gap:16px;margin-bottom:12px}
.skill-ring{position:relative;width:74px;height:74px;border-radius:50%;flex:none;
  background:conic-gradient(var(--green) calc(var(--p,0)*1%), #eef2f6 0);
  display:flex;align-items:center;justify-content:center}
.skill-ring::before{content:"";position:absolute;inset:7px;border-radius:50%;background:var(--card)}
.skill-ring span{position:relative;font-size:28px;font-weight:800;color:var(--green)}
.skill-ring small{position:relative;font-size:13px;color:var(--text-3);font-weight:600}
.skill-head-meta h3{margin:0 0 2px;font-size:16px}
.skill-head-meta p{margin:0;font-size:13px}
.skill-bars{height:8px;background:#eef2f6;border-radius:999px;overflow:hidden;margin-bottom:18px}
.skill-bars .skill-bar{height:100%;background:var(--brand-grad);border-radius:999px;transition:width .5s ease}
.skill-btn{display:flex;align-items:center;gap:14px;width:100%;text-align:left;
  background:var(--card);border:1px solid #f1f5f9;border-radius:14px;padding:14px 16px;
  margin:10px 0;box-shadow:var(--shadow-sm);transition:.15s}
.skill-btn:active{transform:scale(.99)}
.skill-btn .skill-ic{width:46px;height:46px;border-radius:12px;flex:none;
  display:flex;align-items:center;justify-content:center;font-size:24px;background:var(--green-bg)}
.skill-btn .skill-meta{flex:1;min-width:0;display:flex;flex-direction:column}
.skill-btn .skill-meta b{font-size:15px}
.skill-btn .skill-meta small{color:var(--text-2);font-size:12px;margin-top:2px}
.skill-btn .skill-state{font-size:13px;color:var(--green);font-weight:600;white-space:nowrap;flex:none}
.skill-btn.done{background:#f6fffa;border-color:#bbf7d0}
.skill-btn.done .skill-ic{background:#d1fae5}
.skill-btn.done .skill-state{color:#16a34a}
.skill-done-card{background:#f6fffa;border:1px solid #bbf7d0;border-radius:12px;
  padding:12px;margin-top:14px;text-align:center;font-size:15px;font-weight:600;color:#16a34a}

/* ---------- 语料库：联网搜索 / 标记学会 / 笔记本 ---------- */
.tag.ok{background:#dcfce7;color:#16a34a}
.btn.on{background:var(--green-bg);color:var(--green);border-color:var(--green-soft);font-weight:600}
.word-actions{display:flex;gap:8px;margin:8px 0 4px;flex-wrap:wrap}
#net-res .loading{margin:10px 0}
.net-card{background:var(--card);border:1px solid var(--green-soft);border-radius:14px;
  padding:14px 16px;margin:10px 0;box-shadow:var(--shadow-sm)}
.net-top{display:flex;align-items:center;justify-content:space-between;gap:10px}
.net-en{font-size:15px;font-weight:600;color:var(--ink)}
.net-zh{color:var(--text-2);font-size:13.5px;margin:6px 0 10px;line-height:1.5}
.net-actions{display:flex;gap:8px}
.nb-item{background:var(--card);border:1px solid #f1f5f9;border-radius:14px;
  padding:14px 16px;margin:10px 0;box-shadow:var(--shadow-sm)}
.nb-item.mastered{opacity:.72;border-color:#bbf7d0;background:#f6fffa}
.nb-top{display:flex;align-items:center;gap:8px;margin-bottom:4px}
.nb-top b{font-size:15px;color:var(--ink)}
.nb-zh{color:var(--text-2);font-size:13.5px;margin-bottom:8px;line-height:1.5}
.nb-meta{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:10px}
.nb-meta .due{font-size:12px;color:#0369a1;font-weight:600}
.nb-meta .src{font-size:11.5px;color:var(--text-3)}
.nb-actions{display:flex;gap:8px}