/*
 * LexiLink 学生端组件样式
 * styles.css 保留原有的基础设计系统（配色、字阶、卡片），
 * 这一层只补齐学生端新增的组件：顶栏身份区、消息提示、弹窗、抽屉、
 * 表单、分页、学习卡片、任务、测验与权益页面。
 */

.hidden{display:none!important}

/* ---------------- 品牌标识 ----------------
 * 三个端共用同一套标记与字标；标记资源来自 LexiLink/assets/brand/，
 * 品牌规范要求不得给标记另加描边、底色或阴影。
 */

.brand{display:flex;align-items:center;gap:9px;color:var(--ink);font-size:19px}
.brand-mark{display:block;flex:0 0 auto;width:30px;height:30px;background:none;border:0;border-radius:0;font-size:0;box-shadow:none}
.topbar .brand-mark{width:26px;height:26px}
.login-card .brand-mark{width:30px;height:30px}
.login-art .brand-mark{width:52px;height:52px}
.brand .brand-zh{font-size:19px;font-weight:800;color:var(--ink);letter-spacing:1px;margin:0}
.brand .brand-en{font-size:13px;font-weight:600;color:#5560e4;letter-spacing:.2px;margin:0}
.brand .brand-role{font-size:12px;font-weight:700;color:#8b95a7;margin:0 0 0 3px;padding-left:9px;border-left:1px solid #e2e8f0}

/* ---------------- 顶栏与侧边栏 ---------------- */

.user-chip{display:flex;align-items:center;gap:10px}
.user-chip-text strong{display:block;font-size:13px}
.user-chip-text small{display:block;color:var(--muted);font-size:11px;margin-top:2px}
.icon-button{font-weight:800}

.sidebar nav button{display:flex;align-items:center;gap:2px}
.sidebar nav button>span{flex:0 0 27px}
.nav-badge{margin-left:auto;background:#f16b6b;color:#fff;border-radius:10px;font-size:10px;font-weight:800;padding:2px 7px;line-height:1.5}
.sidebar .nav-muted{margin-top:4px}

#view-root{padding:36px clamp(22px,4vw,58px);min-width:0;display:block}
.page-head-actions{display:flex;align-items:center;gap:10px}

/* ---------------- 提示与消息块 ---------------- */

.toast-root{position:fixed;right:24px;bottom:24px;display:flex;flex-direction:column;gap:8px;z-index:60;pointer-events:none}
.toast-root .toast{position:static;opacity:1;transform:none;margin:0;max-width:340px;background:#1d3159;font-size:13px;line-height:1.5;box-shadow:0 12px 30px #1720332e;transition:opacity .24s ease,transform .24s ease}
.toast-root .toast.leaving{opacity:0;transform:translateY(8px)}
.toast-root .toast.success{background:#14886c}
.toast-root .toast.error{background:#bd4a54}
.toast-root .toast.info{background:#1d3159}

.message-block{background:#f6f8fc;border:1px solid var(--line);border-radius:12px;padding:22px;color:#56647a;line-height:1.7}
.message-block.block-error{background:#fff5f5;border-color:#f3d6d6;color:#b7474f}
.message-block .btn{margin-top:14px}

.empty-state{background:#fbfcff;border:1px dashed #cfd8e8;border-radius:12px;text-align:center;padding:44px 22px;color:var(--muted)}
.empty-state p{margin:0}
.empty-state .primary{margin-top:16px}
.loading-state{display:flex;align-items:center;justify-content:center;gap:10px;color:var(--muted);padding:60px 0}
.spinner{width:16px;height:16px;border-radius:50%;border:2px solid #d7e0f2;border-top-color:var(--blue);animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------------- 弹窗与抽屉 ---------------- */

.modal{-webkit-backdrop-filter:none;width:min(680px,100%);max-height:88vh;display:flex;flex-direction:column;overflow:hidden;border-radius:18px;box-shadow:0 24px 66px rgba(16,32,64,.26);padding:0}
.modal.modal-small{width:min(430px,100%)}
.modal.modal-large{width:min(880px,100%)}
.modal-head{display:flex;justify-content:space-between;align-items:flex-start;gap:18px;padding:26px 28px 0}
.modal-head h2{font-size:22px;margin:8px 0 0}
.modal-body{padding:18px 28px 26px;overflow:auto}
.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:20px;flex-wrap:wrap}
.confirm-text{margin:0;color:#3c4a63;line-height:1.75}
.hint{color:var(--muted);font-size:12px;line-height:1.7;margin:8px 0 0}
.help-body ul{margin:14px 0;padding-left:20px;color:#4c5a72;line-height:1.85}
.help-body li{margin-bottom:6px}

.btn{background:#eef1f7;color:#4e5c74;border-radius:10px;padding:12px 17px;font-weight:800}
.btn:hover{background:#e4e9f3}
.btn-danger{background:#fdeceb;color:#bd4a54}
.btn:disabled{opacity:.5;cursor:default}

.drawer-backdrop{position:fixed;inset:0;background:rgba(15,29,56,.5);backdrop-filter:blur(3px);z-index:40;display:flex;justify-content:flex-end}
.drawer{background:#fff;width:min(560px,100%);height:100%;display:flex;flex-direction:column;box-shadow:-18px 0 50px rgba(16,32,64,.2)}
.drawer-head{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;padding:26px 26px 18px;border-bottom:1px solid var(--line)}
.drawer-title{font-size:21px;margin:8px 0 0}
.drawer-meta{color:var(--muted);font-size:12px;margin-top:6px}
.drawer-head-actions{display:flex;align-items:center;gap:12px}
.drawer-body{padding:22px 26px;overflow:auto;flex:1}

/* ---------------- 表单 ---------------- */

.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.form-field{display:flex;flex-direction:column;gap:7px;grid-column:span 1}
.form-field.span-2{grid-column:span 2}
.form-field label{font-size:13px;font-weight:700;color:#425066}
.required{color:#d1515d;font-style:normal}
.form-field input,.form-field select,.form-field textarea{border:1px solid #dce3ee;border-radius:10px;padding:12px 13px;outline:none;width:100%;background:#fff;color:var(--ink)}
.form-field input:focus,.form-field select:focus,.form-field textarea:focus{border-color:var(--blue);box-shadow:0 0 0 3px #3567f21c}
.checkbox-label{display:flex;align-items:center;gap:8px;font-weight:600}
.checkbox-label input{width:auto}
.form-error{grid-column:span 2;color:#c53b4c;font-size:13px;min-height:18px}
.form-grid .modal-actions{grid-column:span 2}
.inline-form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;max-width:520px}
.inline-form .modal-actions{grid-column:span 2;margin-top:0}

/* ---------------- 分页与状态 ---------------- */

.pager{display:flex;justify-content:center;align-items:center;gap:10px;padding:20px 4px 2px;color:#7d899d;font-size:12px;flex-wrap:wrap}
.pager-jump{display:flex;align-items:center;gap:6px}
.pager-total{color:#8a96a8}

.status-pill{font-size:11px;font-weight:800;border-radius:99px;padding:4px 10px;white-space:nowrap}
.status-pill.unlearned{background:#f0f2f5;color:#788496}
.status-pill.new{background:#fdecea;color:#bd4840}
.status-pill.review{background:#fbf3dd;color:#8f6b12}
.status-pill.known{background:#e6f6ee;color:#1d7a52}
/* 旧的三档类名保留，避免老页面或外部样式引用时突然掉色 */
.status-pill.learning{background:#fdecea;color:#bd4840}
.status-pill.mastered{background:#e6f6ee;color:#1d7a52}
.status-pill.level-0{background:#f0f2f5;color:#6b7789}
.status-pill.level-1{background:#fdecea;color:#c0453d}
.status-pill.level-2{background:#fdf0e6;color:#b8682d}
.status-pill.level-3{background:#fbf3dd;color:#8f6b12}
.status-pill.level-4{background:#eaf7f0;color:#2f8c60}
.status-pill.level-5{background:#ddeee5;color:#186b47}

/* 掌握程度配色：与学习卡的分段色阶同一套，全局只在这里定义一次。
   从陌生到熟练是 红 → 橙 → 黄 → 浅绿 → 深绿，颜色本身就是熟练度。 */
:root{
  --level-0:#c3cbd8;
  --level-1:#dc5b53;
  --level-2:#dd7a3f;
  --level-3:#c8951f;
  --level-4:#4fb583;
  --level-5:#1c7a50;
}
.level-dot{width:8px;height:8px;border-radius:2px;display:inline-block;margin-right:6px;vertical-align:middle}
.level-dot.level-0{background:var(--level-0)}
.level-dot.level-1{background:var(--level-1)}
.level-dot.level-2{background:var(--level-2)}
.level-dot.level-3{background:var(--level-3)}
.level-dot.level-4{background:var(--level-4)}
.level-dot.level-5{background:var(--level-5)}
.tag.danger{background:#fdeceb;color:#bd4a54}

.kv{margin:0;display:grid;gap:2px}
.kv>div{display:flex;justify-content:space-between;gap:18px;padding:11px 2px;border-bottom:1px solid #eef1f5}
.kv>div:last-child{border-bottom:0}
.kv dt{color:var(--muted);font-size:13px}
.kv dd{margin:0;font-weight:700;color:#33415a;text-align:right}

/* ---------------- 首页 ---------------- */

.home-grid{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(280px,.85fr);gap:18px;align-items:start}
.home-main,.home-side{display:grid;gap:18px}
.home-main .panel,.home-side .panel{margin-top:0}

/* 首页统计卡：五张并排，既能看数量也能点进对应功能 */
.home-stats{grid-template-columns:repeat(auto-fit,minmax(146px,1fr));margin:18px 0;gap:14px}
.stat-link{
  position:relative;display:block;width:100%;text-align:left;color:inherit;
  cursor:pointer;transition:border-color .14s ease,background-color .14s ease;
}
.stat-link:hover{border-color:#b9cbf5;background:#f8fbff}
.stat-link:focus-visible{outline:2px solid #3567f22b;outline-offset:-2px}
.stat-link .stat-go{position:absolute;right:16px;bottom:16px;color:#c3cbd8;font-weight:800}
.stat-link:hover .stat-go{color:var(--blue)}

.quota-card{background:linear-gradient(135deg,#eef3ff,#f8fbff);border:1px solid #dfe9ff;border-radius:14px;padding:20px}
.quota-card.exhausted{background:linear-gradient(135deg,#fff6e8,#fffdf8);border-color:#f3e0bb}
.quota-card-head{display:flex;flex-direction:column;gap:2px}
.quota-card-head strong{font-size:34px;color:var(--blue);line-height:1.1}
.quota-card.exhausted .quota-card-head strong{color:#b47718}
.quota-card-head small{color:var(--muted)}
.quota-card .progress{margin:14px 0 10px;height:7px}
.quota-card-note{margin:0;color:#66758e;font-size:12px;line-height:1.7}
.quota-card .primary{margin-top:14px;width:100%}

.review-preview{display:flex;flex-direction:column;gap:8px}
.review-chip{display:flex;justify-content:space-between;align-items:baseline;gap:14px;background:#f6f8fc;border-radius:10px;padding:12px 14px;text-align:left;width:100%}
.review-chip:hover{background:#eef3ff}
.review-chip b{font-size:16px}
.review-chip small{color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.review-more{background:transparent;color:var(--blue);font-weight:800;font-size:13px;text-align:left;padding:6px 2px 0}

.notice-row{padding:13px 2px;border-bottom:1px solid #eef1f5}
.notice-row:last-child{border-bottom:0}
.notice-row strong{display:block;font-size:15px}
.notice-row p{margin:6px 0;color:#56647a;line-height:1.7;font-size:14px}
.notice-row small{color:#8a96a8}

.comment-row{padding:12px 2px;border-bottom:1px solid #eef1f5}
.comment-row:last-child{border-bottom:0}
.comment-row p{margin:0 0 6px;color:#4c5a72;line-height:1.7}
.comment-row small{color:#8a96a8}

/* ---------------- 课本与章节 ---------------- */

.book-card.selected{border-color:#b7caff;background:#f8fbff;box-shadow:0 8px 24px #315ce912}
.chapter-list{display:grid;gap:6px}
.chapter-row{display:flex;align-items:center;gap:14px;width:100%;text-align:left;background:#fbfcff;border:1px solid #eaeef6;border-radius:10px;padding:13px 15px}
.chapter-row:hover{border-color:#c3d3ff;background:#f4f8ff}
.chapter-code{color:var(--blue);font-weight:800;font-size:12px;min-width:52px}
.chapter-title{flex:1;font-weight:700;color:#33415a}
.chapter-type{color:var(--muted);font-size:12px}
.chapter-arrow{color:#b8c4d8;font-weight:800}
.chapter-row.depth-1{margin-left:22px}
.chapter-row.depth-2{margin-left:44px}
.chapter-row.depth-3{margin-left:66px}
.chapter-row.depth-4,.chapter-row.depth-5{margin-left:88px}

.word-ipa{color:#5273d7;font-weight:700}

/* 修订中的词：留在列表里但不让点，避免"刚学过的词凭空消失" */
.word-row-locked{opacity:.6}
.word-locked{
  font-size:12px;font-weight:700;color:#8a96a8;background:#f0f2f5;
  border-radius:4px;padding:6px 9px;white-space:nowrap;
}


/* ---------------- 复习 ---------------- */

.review-actions{flex-wrap:wrap}
.review-actions .hard{background:#fff6e6;color:#b47718}
.review-actions .easy{background:#eef4ff;color:#3567f2}
.review-actions button>span{margin-right:4px}

/* ---------------- 任务 ---------------- */

.task-row{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:16px 4px;border-bottom:1px solid #eef1f5}
.task-row:last-child{border-bottom:0}
.task-row.done{opacity:.72}
.task-title{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.task-title strong{font-size:17px}
.task-meta{display:flex;gap:16px;color:var(--muted);font-size:12px;margin-top:7px;flex-wrap:wrap}
.task-actions{display:flex;align-items:center;gap:12px}

/* ---------------- 课堂测验 ---------------- */

.quiz-progress{margin-bottom:16px}
.quiz-progress .progress{height:7px}
.quiz-progress small{color:var(--muted)}
.quiz-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px}
.quiz-head{display:flex;align-items:center;gap:12px;color:var(--muted);font-size:12px;flex-wrap:wrap}
.quiz-stem{margin:18px 0;font-size:18px;line-height:1.85;color:#26344d}
.quiz-options{display:grid;gap:10px}
.quiz-option{display:flex;align-items:flex-start;gap:12px;border:1px solid #e3e9f4;border-radius:11px;padding:13px 15px;cursor:pointer;line-height:1.7}
.quiz-option:hover{border-color:#c3d3ff;background:#f8fbff}
.quiz-option.selected{border-color:var(--blue);background:#f2f6ff}
.quiz-option input{margin-top:4px}
.quiz-option b{color:var(--blue);min-width:16px}
.quiz-input{width:100%;border:1px solid #dce3ee;border-radius:11px;padding:14px;outline:none}
.quiz-input:focus{border-color:var(--blue);box-shadow:0 0 0 3px #3567f21c}
.quiz-nav{display:flex;justify-content:flex-end;gap:10px;margin-top:22px;flex-wrap:wrap}

/* ---------------- 我的权益 ---------------- */

.quota-summary{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:14px}
.quota-summary div{background:#f5f7fb;border-radius:11px;padding:14px;text-align:center}
.quota-summary strong{display:block;font-size:24px;color:var(--blue)}
.quota-summary small{color:var(--muted);font-size:11px}
.entitlement-row,.order-row{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:14px 2px;border-bottom:1px solid #eef1f5}
.entitlement-row:last-child,.order-row:last-child{border-bottom:0}
.entitlement-row strong,.order-row strong{display:block;font-size:15px}
.entitlement-row small,.order-row small{color:var(--muted);font-size:12px}
.entitlement-meta{text-align:right;color:#56647a}
.entitlement-meta small{display:block;color:var(--muted);margin-top:3px}
.product-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px}
.product-card{border:1px solid var(--line);border-radius:13px;padding:18px}
.product-card p{margin:8px 0 12px;color:var(--muted);font-size:13px;line-height:1.7}
.product-meta{display:flex;gap:10px;flex-wrap:wrap;color:var(--blue);font-size:12px;font-weight:800;margin-bottom:14px}

/* ---------------- 教师反馈 ---------------- */

.comment-card{border:1px solid var(--line);border-radius:12px;padding:16px;margin-bottom:12px;background:#fff}
.comment-card.expired{opacity:.65}
.comment-head{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.comment-time{margin-left:auto;color:var(--muted);font-size:12px}
.comment-card p{margin:10px 0 0;color:#3f4d66;line-height:1.8}
.comment-note{display:block;margin-top:8px;color:#8a96a8}

/* ---------------- 单词学习卡 ----------------
 * 一页看全：头部吸顶（单词 + 音标 + 播放 + 分区导航），中间整列滚动，
 * 底部吸顶操作条。内容不再分页签隐藏，学习区从原来的 175px 提高到约 460px。
 */

.modal.modal-study{
  width:min(1040px,100%);
  height:min(900px,calc(100vh - 24px));
  max-height:none;padding:0;overflow:hidden;border-radius:22px;
  display:flex;flex-direction:column;
}
.modal.modal-study .modal-body{padding:0;flex:1 1 auto;min-height:0;display:flex;flex-direction:column;overflow:hidden}

.study-head{flex:0 0 auto;padding:18px 32px 0;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 10px 20px rgba(23,32,51,.05);z-index:2}
.study-head-main{display:flex;align-items:flex-start;gap:16px}
.study-head-word{flex:1;min-width:0}
.study-head-word h1{font-size:36px;line-height:1.05;letter-spacing:-.04em;margin:0}
.study-head-phon{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:7px}
.study-head-phon .phonetic{font-size:16px;color:#5273d7;letter-spacing:.02em}
.accent-switch{display:flex;gap:6px}
.study-head .status-pill{align-self:flex-start;margin-top:8px}
.study-head .close{background:transparent;color:#8b97aa;font-size:26px;line-height:1;padding:0 2px}

.study-toolbar{display:flex;align-items:center;gap:14px;flex-wrap:wrap;padding:11px 0 9px}
.tool-group{display:flex;align-items:center;gap:6px}
.tool-label{color:#68758c;font-size:12px;font-weight:800}
.audio-play{width:40px;height:40px;border-radius:50%;background:var(--blue);color:#fff;font-size:15px;display:grid;place-items:center;flex:0 0 auto}
.audio-chip{background:#fff;border:1px solid #dde5f5;color:#5b6b85;border-radius:8px;padding:7px 11px;font-size:12px;font-weight:800}
.audio-chip:hover{border-color:#b9cbf5}
.audio-chip.active{background:#eaf0ff;border-color:#b9cbf5;color:var(--blue)}
.audio-badge{margin-left:auto;font-size:11px;font-weight:800;color:#68758c}
.audio-badge.ready{color:#138d6e}
.audio-badge.warn{color:#b47718}

.study-nav{display:flex;gap:10px;overflow-x:auto}
.study-nav-item{background:transparent;color:var(--muted);padding:10px 3px;font-weight:800;font-size:14px;border-bottom:2px solid transparent;white-space:nowrap}
.study-nav-item:hover{color:var(--blue)}
.study-nav-item.active{color:var(--blue);border-color:var(--blue)}

.study-body{flex:1 1 auto;min-height:0;overflow:auto;padding:22px 32px 28px;background:#f8faff;scrollbar-gutter:stable}
.study-group{max-width:820px;margin:0 auto 30px}
.study-group:last-child{margin-bottom:0}
.group-title{
  font-size:13px;letter-spacing:.1em;color:var(--blue);margin:0 0 14px;
  padding-left:10px;border-left:3px solid var(--blue);
}

.study-body .study-core{background:#fff;border:1px solid #e2eaff;border-radius:14px;padding:18px 20px;margin-bottom:16px}
.study-body .study-core p{font-size:21px;font-weight:700;color:#1c315d;line-height:1.6;margin:8px 0 0}
.study-body .study-core .section-label{font-size:11px;font-weight:900;letter-spacing:.1em;color:var(--blue)}
.study-body .summary-line{display:block;margin-top:10px;color:#5b6a82;font-size:14px;line-height:1.8}

/* 正文统一按中文阅读习惯放大行距、加深次要文字 */
.study-body .sense,.study-body .usage-row,.study-body .example-row,
.study-body .timeline-row,.study-body .formation-row{
  background:#fff;border:1px solid #edf0f5;border-radius:12px;padding:14px 16px;margin:10px 0;
  line-height:1.85;font-size:16px;
}
.study-body .sense small,.study-body .usage-row small,.study-body .timeline-row small,
.study-body .example-note,.study-body .timeline-note{color:#5b6a82}
.study-body .sense-register{background:#eef2f9;color:#5b6a82}

/* 小标题：容器改名成 .study-group 后旧规则不再命中，之前一直在用浏览器默认边距 */
.study-body .study-group h3{font-size:15px;color:#24385c;margin:16px 0 8px}
.study-body .study-group h3:first-child{margin-top:0}

/* 词源阶段：语言名 / 词形与说明 / 证据等级三列。
   旧样式给所有 span 加 flex:1，会把"已核验"压成 40px 竖排文字。 */
.study-body .timeline-row{display:grid;grid-template-columns:92px minmax(0,1fr) auto;gap:2px 14px;align-items:start}
.study-body .timeline-row b{min-width:0}
.study-body .timeline-row span{display:block}
.study-body .timeline-row>small{white-space:nowrap;color:#8a96a8}
.study-body .timeline-note{white-space:normal}

/* 构词分析：标签 + 说明 + 等级一行，构词成分另起一行铺满 */
.study-body .formation-row{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:8px 12px;align-items:center}
.study-body .formation-row .tag{grid-column:1;grid-row:1}
.study-body .formation-row>span:nth-child(2){grid-column:2;grid-row:1}
.study-body .formation-grade{grid-column:3;grid-row:1;justify-self:end;white-space:nowrap;align-self:center}
.study-body .formation-parts{grid-column:1/-1;grid-row:2;flex:none}

/* 例句改成英文在上、中文在下：两栏排列时长句会被挤成窄栏 */
.study-body .example-row{display:block}
.study-body .example-row b{display:block;font-size:17px;color:#1c315d;line-height:1.6}
.study-body .example-row span{display:block;margin-top:3px;color:#4f5e77}

/* 用法条目改成纵向卡片。
   alcohol 这类词条的用法说明有上百字，旧的三列 flex 会把正文挤成 69px 宽、
   每行只放一两个字，一个条目能撑到 600px 高。 */
.study-body .usage-row{display:block}
.usage-head{display:flex;align-items:baseline;gap:8px;flex-wrap:wrap}
.usage-type{flex:0 0 auto;font-size:11px;font-weight:700;color:var(--blue);background:#eef2fb;border-radius:4px;padding:3px 7px}
.usage-pattern{font-size:15px;font-weight:600;color:#1c315d;line-height:1.6}
.usage-text{margin:9px 0 0;color:#4f5e77;line-height:1.8}
.usage-text strong{color:#1c315d}
.usage-error{margin:10px 0 0;padding:9px 12px;background:#fff7f6;border-left:3px solid #e08b83;border-radius:4px;color:#8a4a44;line-height:1.75}
.usage-error b{color:#c05348;font-weight:700;margin-right:6px}

/* 短语与固定搭配：和用法条目同一套卡片语言 */
.study-body .phrase-row{
  background:#fff;border:1px solid #edf0f5;border-radius:var(--flat-radius);
  padding:14px 16px;margin:10px 0;font-size:15px;line-height:1.8;
}
.phrase-head{display:flex;align-items:baseline;gap:8px;flex-wrap:wrap}
.phrase-type{flex:0 0 auto;font-size:11px;font-weight:700;color:var(--blue);background:#eef2fb;border-radius:4px;padding:3px 7px}
.phrase-text{font-size:15px;font-weight:600;color:#1c315d}
.phrase-row p{margin:8px 0 0;color:#4f5e77}
.phrase-note{color:#5b6a82}
.phrase-example{margin-top:10px!important;padding:9px 12px;background:#f6f8fb;border-radius:4px;color:#33415a}
.phrase-example small{display:block;margin-top:3px;color:#68758a}

/* 词形变化 */
.form-list{display:grid;gap:8px}
.form-item{
  background:#fff;border:1px solid #edf0f5;border-radius:var(--flat-radius);
  padding:11px 14px;display:flex;align-items:baseline;gap:10px;flex-wrap:wrap;
}
.form-item b{font-size:15px;font-weight:700;color:#1c315d;min-width:96px}
.form-item span{font-size:12px;font-weight:700;color:var(--blue)}
.form-item small{flex-basis:100%;color:#5b6a82;font-size:13px}

/* 附件：和管理端单词维护里一致——徽章一行，链接原文另起一行可点。
   外链直接给学生看链接本身，比"视频附件"这种描述清楚得多。 */
.study-body .attachment-list{display:grid;gap:8px}
.study-body .attachment{
  background:#fff;border:1px solid #edf0f5;border-radius:var(--flat-radius);
  padding:12px 14px;display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 10px;font-size:15px;
}
.attachment-tags{display:flex;gap:6px;flex-wrap:wrap}
/* 选择器要带上 .attachment：styles.css 里有一条遗留规则 .attachment span{color:#56647a}，
   特指度比单个类高，会把徽章颜色压掉。 */
.study-body .attachment .attachment-tag{
  font-size:12px;font-weight:600;border-radius:4px;padding:3px 8px;
  background:#f1f4f9;color:#5b6a82;
}
.study-body .attachment .attachment-tag-type{background:#eef2fb;color:var(--blue)}
.attachment-link{
  /* flex-basis 用 0：长链接会自己折行，而不会把徽章挤到下一行 */
  flex:1 1 0;min-width:0;color:var(--blue);font-size:13px;line-height:1.65;
  word-break:break-all;text-decoration:underline;text-underline-offset:2px;
}
.attachment-link:hover{color:#2a56d8}
.attachment-note{flex:1 1 0;min-width:0;color:#8a96a8;font-size:12px;line-height:1.65;word-break:break-all}
/* 版权信息独占一行，和链接区分开 */
.attachment-meta{flex-basis:100%;color:#8a96a8;font-size:12px;line-height:1.6}
.study-body .attachment .word-action{align-self:flex-start;text-decoration:none;min-height:32px}

/* ---------------- 个人笔记 ----------------
 * 学习卡里的笔记区和笔记本共用同一套样式。
 * 视觉上要和"官方资料"区分开：用暖色系 + 明确的"仅自己可见"措辞。
 */
.note-list{display:grid;gap:10px}
.note-item{
  background:#fffdf7;border:1px solid #f0e6cf;border-radius:var(--flat-radius);
  padding:13px 15px;font-size:15px;line-height:1.8;
}
.note-item.done{background:#fafbfc;border-color:#e8ecf2;opacity:.75}
.note-head{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.note-head small{color:#8a96a8;font-size:12px}
.note-type{font-size:11px;font-weight:700;border-radius:4px;padding:3px 7px}
.note-type.question{background:#fdecea;color:#c0453d}
.note-type.review{background:#eef2fb;color:#3567f2}
.note-done{font-size:11px;font-weight:700;color:#138d6e}
.note-word{
  background:transparent;color:var(--blue);font-weight:700;font-size:15px;
  padding:0;text-decoration:underline;text-underline-offset:2px;
}
.note-text{margin:8px 0 0;color:#3f4d66;white-space:pre-wrap}
.note-actions{display:flex;gap:8px;margin-top:10px;flex-wrap:wrap}
.note-empty{
  background:#fffdf7;border:1px dashed #eadfc4;border-radius:var(--flat-radius);
  padding:18px;color:#8a7c5e;line-height:1.8;font-size:14px;
}
.note-add{
  display:inline-block;margin-top:12px;background:#fdf6e6;color:#9a7b2e;
  border:1px solid #f0e2c2;border-radius:4px;padding:9px 14px;font-size:13px;font-weight:700;
}
.note-add:hover{background:#f9edd6}
.note-area .empty-inline{padding:12px 0}

/* 我的记忆法：学生自己形成的记法（谐音、联想、拆分、小故事），纯个人内容。
   沿用个人笔记的琥珀色家族，在助记区里正好和白色的官方助记形成"官方 / 我的"对比。 */
.note-type.memory{background:#efe8fb;color:#5b45b0}
.note-personal{font-size:11px;font-weight:700;border-radius:4px;padding:3px 7px;background:#f6efdc;color:#7c6a3f}
.note-item.memory{background:#fff9ec;border-color:#f0e0bd}
.memory-area{margin-top:12px}
.memory-area .empty-inline{padding:12px 0}

/* 查词学习：一个输入框 + 结果列表，结果行复用章节词表的 .word-row 布局 */
.lookup-form{display:flex;gap:10px;align-items:center}
.lookup-input{
  flex:1;min-width:0;background:#fff;border:1px solid #dce3ee;border-radius:var(--flat-radius);
  padding:12px 14px;font-size:16px;color:var(--ink);
}
.lookup-input:focus{outline:none;border-color:var(--blue)}
.lookup-form .primary{min-height:44px;padding:0 22px;white-space:nowrap}
.lookup-hint{margin:10px 0 0;color:#8a96a8;font-size:12.5px;line-height:1.7}
.lookup-result{margin-top:16px}
.lookup-count{margin:0 0 4px;color:#7d899d;font-size:12.5px}
.lookup-examples{display:flex;align-items:center;gap:8px;flex-wrap:wrap;color:#8a96a8;font-size:13px}
.lookup-example{background:#f1f5ff;color:var(--blue);border-radius:6px;padding:5px 10px;font-size:12.5px;font-weight:700}
.lookup-example:hover{background:#e2e9fa}
.study-body .memory-note{border:1px solid #f3dda1;border-radius:12px;padding:14px 16px;font-size:15px;line-height:1.8}
.study-body .related-word,.study-body .mnemonic{
  background:#fff;border:1px solid #edf0f5;border-radius:12px;padding:13px 15px;font-size:15px;line-height:1.75;
}
.study-body .relation-item{background:#fff;border:1px solid #edf0f5;border-radius:12px;padding:13px 15px}
.study-body .relation-list{display:grid;gap:10px}
.study-body .empty-inline{background:#fff;border:1px dashed #d7dfec;border-radius:12px;padding:18px;text-align:center}

.study-foot{
  flex:0 0 auto;background:#fff;border-top:1px solid var(--line);
  box-shadow:0 -10px 20px rgba(23,32,51,.05);padding:12px 32px 14px;
}
.foot-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.foot-row.quiet{border-top:1px dashed #e8edf6;padding-top:10px;margin-top:10px}
.study-foot .level-progress{margin-right:auto}
/* 图标 + 文字统一用内联弹性盒对齐；旧的 .study-footer 规则在改名后已不生效 */
.study-foot .feedback,.study-foot .foot-nav button,.study-foot .error-actions button{
  display:inline-flex;align-items:center;justify-content:center;gap:7px;
}

/* 右下角五个按钮（要复习／生僻词／我会了／上一个／下一个）统一尺寸。
   之前宽度随文字长短在 96–101px 之间浮动、高度也差 1px，看起来不齐。 */
.study-foot .foot-actions button,
.study-foot .foot-nav button{
  min-width:104px;
  height:40px;
  min-height:40px;
  padding:0 14px;
  font-size:13px;
  font-weight:600;
}
/* 旧样式给 .error-actions 设了 width:100%，会把底部顶成三行 */
.study-foot .error-actions{width:auto;order:0}
.foot-actions{display:flex;gap:8px;flex-wrap:wrap}
.foot-nav{display:flex;gap:8px;margin-left:auto}

/* 纠错按钮组标成"我易犯错"：只写进学生自己的纠错本，不是向平台反馈，标题要写清楚 */
.error-actions-label{white-space:nowrap;padding-right:2px}
/* 底部两组标签（掌握程度、我易犯错）统一字体：字号更大、字重一致、颜色更深，
   之前 11px 的浅灰在低分屏上几乎看不清。 */
.study-foot .level-progress-label,
.study-foot .error-actions-label{
  font-family:inherit;font-size:12.5px;font-weight:700;letter-spacing:.02em;color:#4d5b73;
}
.panel-hint{
  margin:0 0 12px;padding:10px 12px;background:#f6f8fb;border:1px solid var(--line);
  border-radius:6px;color:#5b6a82;font-size:13px;line-height:1.7;
}

/* 掌握程度：由低到高的阶梯条。
   原来是 6 个等高等宽的小方块，看不出"哪边更熟"；现在高度逐级递增、底对齐，
   方向一眼可见，当前档位用该档自己的颜色填充。 */
.study-foot .level-progress{display:flex;align-items:flex-end;gap:4px;min-height:34px}
.study-foot .level-progress-label{align-self:center;margin-right:6px}
.study-foot .level-progress-text{align-self:center;margin-left:6px}
.study-foot .level-segment{
  width:24px;height:7px;border-radius:2px;background:#e4e9f2;
  transition:background-color .14s ease;
}
.study-foot .level-segment[data-level="1"]{height:11px}
.study-foot .level-segment[data-level="2"]{height:15px}
.study-foot .level-segment[data-level="3"]{height:19px}
.study-foot .level-segment[data-level="4"]{height:23px}
.study-foot .level-segment[data-level="5"]{height:27px}
.study-foot .level-segment:hover{background:#c8d3e4;transform:none}

/* 填充色取"当前档位"的颜色——3 级时三格同为黄色，颜色本身就是掌握程度。
   未学习（0 级）不点亮任何一格。 */
.study-foot .level-segment.active{border-radius:2px}
.study-foot .level-progress[data-level="1"] .level-segment.active{background:#dc5b53}
.study-foot .level-progress[data-level="2"] .level-segment.active{background:#dd7a3f}
.study-foot .level-progress[data-level="3"] .level-segment.active{background:#c8951f}
.study-foot .level-progress[data-level="4"] .level-segment.active{background:#4fb583}
.study-foot .level-progress[data-level="5"] .level-segment.active{background:#1c7a50}

/* 可选第二种画法：每格各自一色的"阶梯"版——给 .level-progress 加上 level-ramp 即可切换 */
.study-foot .level-progress.level-ramp .level-segment[data-level="1"].active{background:#dc5b53}
.study-foot .level-progress.level-ramp .level-segment[data-level="2"].active{background:#dd7a3f}
.study-foot .level-progress.level-ramp .level-segment[data-level="3"].active{background:#c8951f}
.study-foot .level-progress.level-ramp .level-segment[data-level="4"].active{background:#4fb583}
.study-foot .level-progress.level-ramp .level-segment[data-level="5"].active{background:#1c7a50}

.study-foot .level-progress-text{color:#68758c;font-weight:700}
.study-foot .level-progress[data-level="0"] .level-progress-text{color:#8a96a8}
.study-foot .level-progress[data-level="1"] .level-progress-text{color:#cb4f48}
.study-foot .level-progress[data-level="2"] .level-progress-text{color:#c26a2d}
.study-foot .level-progress[data-level="3"] .level-progress-text{color:#a1791a}
.study-foot .level-progress[data-level="4"] .level-progress-text{color:#2f8c60}
.study-foot .level-progress[data-level="5"] .level-progress-text{color:#186b47}

.formation-parts{display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.formation-parts code{display:inline-flex;align-items:baseline;gap:5px}
.formation-parts code i{font-style:normal;font-size:11px;color:#7a87a0;font-weight:600}
.formation-grade{align-self:center;color:#8a96a8;white-space:nowrap}

/* 词源阶段里的整段说明：之前只显示了语言名和词形 */
.timeline-note{display:block;margin-top:5px;color:#6a7890;line-height:1.7}
.sense-register{display:inline-block;margin-left:8px;font-style:normal;font-size:11px;font-weight:800;color:#7a87a0;background:#f0f2f6;border-radius:6px;padding:2px 7px}
.example-note{display:block;margin-top:5px;color:#6a7890}
.example-level{display:inline-block;margin-top:5px;font-style:normal;font-size:11px;font-weight:800;color:#b47718}
.mnemonic-source{grid-column:2;color:#8a96a8}
.mnemonic-source:not(.user){color:#138d6e}

.relation-item{width:100%}
.related-word small,.mnemonic small{grid-column:2;color:#8a96a8}

@media(max-width:900px){
  .home-grid{grid-template-columns:1fr}
  .quiz-option,.task-row{align-items:flex-start}
}

@media(max-width:560px){
  #view-root{padding:24px 15px 96px}
  .modal.modal-study{border-radius:16px;height:calc(100vh - 12px)}
  .study-head{padding:14px 16px 0}
  .study-head-word h1{font-size:30px}
  .study-head-phon{gap:8px;margin-top:5px}
  /* 播放设置横向滚动，避免在窄屏挤出三四行 */
  .study-toolbar{flex-wrap:nowrap;overflow-x:auto;gap:10px;padding:9px 0 7px}
  .study-toolbar .audio-badge{margin-left:0;flex:0 0 auto}
  .study-nav-item{font-size:13px;padding:9px 2px}
  .study-body{padding:16px 16px 20px}
  .study-foot{padding:10px 16px 12px}
  .foot-actions{width:100%}
  .foot-actions button{flex:1;min-height:38px;padding:9px 8px;font-size:13px}
  .foot-nav{width:100%;margin-left:0}
  .foot-nav button{flex:1;min-height:38px;padding:9px 10px;font-size:13px}
  .study-foot .error-actions{width:100%}
  .study-foot .error-actions button{flex:1;min-height:34px;font-size:12px}
  .modal-head{padding:22px 20px 0}
  .modal-body{padding:16px 20px 22px}
  .form-grid,.inline-form{grid-template-columns:1fr}
  .form-field,.form-field.span-2,.form-error,.form-grid .modal-actions,.inline-form .modal-actions{grid-column:span 1}
  .quota-summary{grid-template-columns:1fr}
  .task-row{flex-direction:column;gap:12px}
  .task-actions{width:100%;justify-content:space-between}
  .entitlement-row,.order-row{flex-direction:column;align-items:flex-start;gap:8px}
  .entitlement-meta{text-align:left}
  .audio-badge{margin-left:0;width:100%}
  .toast-root{left:15px;right:15px;bottom:15px}
  /* 窄屏顶栏放不下「学习端」后缀时优先保留品牌名，避免与右侧操作区挤在一起 */
  .topbar .brand{gap:7px}
  .topbar .brand-role{display:none}
}

/* 移动端导航为横向滚动：九个入口固定在底部会挤成两行 */
@media(max-width:900px){
  /* 基础样式里 nav 是 flex-direction:column，这里必须显式改回横排，
     否则九个入口会全部叠在同一个位置（只是被 overflow 裁掉，看起来像只有一个）。 */
  .sidebar nav{display:flex;flex-direction:row;overflow-x:auto;overflow-y:hidden;gap:2px;grid-template-columns:none}
  .sidebar nav button{flex:0 0 auto;min-width:78px;text-align:center}
  .sidebar nav button>span{width:auto;flex:0 0 auto}
  .sidebar nav button .nav-badge{margin-left:4px}
}

/* =====================================================================
 * Flat 主题（试做版）
 * ---------------------------------------------------------------------
 * 这一整段都是对 styles.css 的覆盖，删掉本段即可回到原来的视觉。
 * 三条原则：不用阴影、不用渐变、按钮不做位移反馈。
 * ===================================================================== */

:root{
  /* 系统字体优先：中英文都用系统 UI 字，字重与行高更一致，也不再为西文单独挂字体 */
  font-family:system-ui,-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei UI","Microsoft YaHei","Source Han Sans SC","Helvetica Neue",Arial,sans-serif;
  font-size:15px;
  color:#1b2436;
  background:#f2f4f8;
  --flat-radius:6px;
  --flat-radius-sm:4px;
  --flat-line:#e2e7f0;
  --flat-line-strong:#cdd6e4;
  --flat-ink:#1b2436;
  --flat-muted:#68758a;
  --flat-bg:#f2f4f8;
  --flat-surface:#ffffff;
  --flat-soft:#f6f8fb;
}

body{font-size:15px;color:var(--flat-ink);background:var(--flat-bg)}

/* ---------- 1. 去掉阴影与渐变 ---------- */

.panel,.stat-card,.book-card,.review-card,.review-chip,.chapter-row,.quota-card,.hero,
.comment-card,.product-card,.quiz-card,.message-block,.empty-state,.comment-row,.notice-row,
.modal,.drawer,.drawer-backdrop,.toast-root .toast,.study-head,.study-foot,.study-core,
.memory-note,.sense,.usage-row,.example-row,.timeline-row,.formation-row,.related-word,
.mnemonic,.attachment,.relation-item,.login-card,.form-field input,.form-field select,
.form-field textarea,.quiz-input,.quiz-option,.toolbar,.table-panel{
  box-shadow:none!important;
  background-image:none!important;
}

/* 背景一律用纯色替代渐变 */
.hero,.quota-card,.study-core{background:var(--flat-soft)!important}
.quota-card.exhausted{background:#fffaf0!important}
.login-art{background:#16233d!important}
.login-screen{background:#16233d!important}
.orb{filter:none;opacity:.5}
.modal-backdrop,.drawer-backdrop{background:rgba(16,24,40,.55);backdrop-filter:none}
.topbar,.sidebar,.modal,.drawer,.study-head,.study-foot,.panel,.stat-card{background:var(--flat-surface)}
.study-body{background:var(--flat-bg)}

/* ---------- 2. 圆角一律收到 6px / 4px ---------- */

.panel,.stat-card,.book-card,.review-card,.review-chip,.chapter-row,.quota-card,.hero,
.comment-card,.product-card,.quiz-card,.message-block,.empty-state,.modal,.drawer,
.login-card,.study-core,.memory-note,.sense,.usage-row,.example-row,.timeline-row,
.formation-row,.related-word,.mnemonic,.attachment,.relation-item,
.form-field input,.form-field select,.form-field textarea,.quiz-input,.quiz-option,
.message-block,.drawer-backdrop,.search-box{
  border-radius:var(--flat-radius)!important;
}
.tag,.status-pill,.audio-chip,.level-segment,.nav-badge,.review-actions button,.feedback,
.primary,.btn,.word-action,.page-button,.error-actions button,.error-resolve,.status-filter,
.quiz-nav button,.foot-nav button{
  border-radius:var(--flat-radius-sm)!important;
}
.level-segment{border-radius:2px!important}

/* 其余零星组件也收到同一套圆角，避免出现 8px/9px/13px 混用 */
.hero-card,.chat-panel,.chat-head,.chat-form input,.chat-form button,.suggestions button,
.suggestions,.bubble,.quick-links button,.word-pagination,.word-list-head,.comment-card,
.entitlement-row,.order-row,.notice-row,.home-main .panel,.home-side .panel{
  border-radius:var(--flat-radius)!important;
}
.chat-form input,.chat-form button,.suggestions button{border-radius:var(--flat-radius-sm)!important}

/* 扫描后剩下的零星圆角与渐变 */
.secondary,.review-word,.spark{border-radius:var(--flat-radius-sm)!important}
.nav-muted{border-radius:var(--flat-radius)!important}
.quota-summary div{border-radius:var(--flat-radius)!important}
.spark{background:var(--blue)!important;background-image:none!important}

/* ---------- 3. 按钮：纯色填充、无位移、统一的悬停反馈 ---------- */

.primary,.btn,.word-action,.page-button,.audio-chip,.feedback,.error-actions button,
.error-resolve,.status-filter,.nav-muted,.sidebar nav button,.quiz-nav button,
.foot-nav button,.error-actions button,.icon-button,.switch-auth,.close{
  box-shadow:none!important;
  transition:background-color .14s ease,color .14s ease,border-color .14s ease!important;
}
.primary:hover,.btn:hover,.word-action:hover,.page-button:hover,.audio-chip:hover,
.feedback:hover,.error-actions button:hover,.error-resolve:hover,.study-foot .primary:hover,
.study-body .relation-item:hover,.book-card:hover,.chapter-row:hover,.review-chip:hover,
.review-word:hover{
  transform:none!important;
  box-shadow:none!important;
}
.primary{background:var(--blue);font-weight:600}
.primary:hover{background:#2a56d8}
.btn{background:#eef1f6;color:#46536a;font-weight:600}
.btn:hover{background:#e3e8f0}
.word-action{background:#eef2fb;color:var(--blue);font-weight:600}
.word-action:hover{background:#e2e9fa}
.primary,.btn,.word-action,.page-button,.audio-chip{font-size:13px;font-weight:600}
.primary,.study-foot .primary{min-height:40px;padding:10px 16px}
.btn,.word-action,.page-button,.audio-chip{min-height:32px}

/* ---------- 4. 字号与字重：收紧层级、正文 15px ---------- */

.page-head h1{font-size:24px;font-weight:700;letter-spacing:-.01em}
.page-head p{font-size:14px}
.panel-title h3{font-size:15px;font-weight:700}
.eyebrow{font-size:10px;font-weight:700;letter-spacing:.14em}
.stat-card .label{font-size:12px}
.stat-card strong{font-size:24px;font-weight:700;margin-top:8px}
.hero h1,.quota-card-head strong{font-size:22px;font-weight:700}
.hero p,.quota-card-note{font-size:13px}
.book-card h3{font-size:16px;font-weight:700}
.word-row strong,.review-card h3{font-size:16px}
.word-row .meaning,.word-study-meta span{font-size:14px}
.tag,.status-pill{font-size:11px;font-weight:600}
.nav-muted,.sidebar nav button{font-size:14px;font-weight:600}
.sidebar nav button>span{font-size:16px}
.user-chip-text strong{font-size:13px}
.user-chip-text small{font-size:11px}

/* 学习卡字号 */
.study-head-word h1{font-size:32px;font-weight:700}
.study-head-phon .phonetic{font-size:15px}
.group-title{font-size:12px;font-weight:700;letter-spacing:.08em}
.study-body .study-group h3{font-size:14px;font-weight:700}
.study-body .study-core p{font-size:19px;font-weight:600}
.study-body .sense,.study-body .usage-row,.study-body .example-row,
.study-body .timeline-row,.study-body .formation-row{font-size:15px;line-height:1.8}
.study-body .example-row b{font-size:16px;font-weight:600}
.study-nav-item{font-size:13px;font-weight:600}
.study-head .close{font-size:22px}

/* 登录页：渐变去掉后标题也要跟着收到新的字阶 */
.login-art h1{font-size:clamp(30px,3.6vw,44px);font-weight:700;letter-spacing:-.02em;margin:22px 0 16px}
.login-art>p:not(.eyebrow){font-size:15px;line-height:1.8}
.login-card h2{font-size:26px;font-weight:700;margin:32px 0 6px}
.login-card label{font-size:13px;font-weight:600}
.login-note{font-size:12px;margin-top:28px}

/* ---------- 5. 表格、表单与提示 ---------- */

.form-field label{font-size:13px;font-weight:600}
.form-field input,.form-field select,.form-field textarea,
.quiz-input,.login-card input{border-radius:var(--flat-radius)!important;font-size:15px}
/* 基础样式只给 input/button 加了 font:inherit，select 会退回 Arial、
   textarea 会变成等宽字体——中文界面里一眼就能看出来，这里统一收回页面字体。 */
select,textarea{font-family:inherit}
.form-field textarea{line-height:1.7}
.form-field input:focus,.form-field select:focus,.form-field textarea:focus,
.quiz-input:focus{border-color:var(--blue);box-shadow:none;outline:2px solid #3567f22b;outline-offset:1px}
.toast-root .toast{border-radius:var(--flat-radius)!important}
.message-block,.empty-state{border-radius:var(--flat-radius)!important}

/* ---------- 6. 导航与侧栏 ---------- */

.topbar{border-bottom:1px solid var(--flat-line)}
.sidebar{border-right:1px solid var(--flat-line)}
.sidebar nav button{border-radius:var(--flat-radius)!important}
.sidebar nav button:hover{background:#eef2f8}
.sidebar nav button.active{background:#e8eefc;color:var(--blue)}
.avatar{border-radius:50%}
.icon-button{border-radius:var(--flat-radius-sm)!important}

/* Flat 段落写在媒体查询之后，会把窄屏的字号与内边距盖掉，这里再压回来 */
@media(max-width:900px){
  .page-head h1{font-size:21px}
  .hero h1{font-size:20px}
}
@media(max-width:560px){
  .study-head{padding:14px 16px 0}
  .study-head-word h1{font-size:28px}
  .study-body{padding:16px 16px 20px}
  .study-foot{padding:10px 16px 12px}
  .study-body .study-core p{font-size:18px}
  .study-body .example-row b{font-size:15px}
  .login-art h1{font-size:30px}
  .login-card h2{font-size:23px}
  /* 窄屏放不下"我易犯错"标签和三个按钮时，标签单独占一行 */
  .error-actions{flex-wrap:wrap}
  .error-actions-label{width:100%}
}