/* ============================================================
 * 蜗牛AI 学员门户 — 全局样式
 * 品牌色：主绿 #2E7D32 / #4CAF50，强调橙 #d97757
 * ============================================================ */
:root {
  --green-900: #1b5e20;
  --green-700: #2E7D32;
  --green-500: #4CAF50;
  --green-100: #e8f5e9;
  --orange: #d97757;
  --ink: #1f2933;
  --gray-600: #52606d;
  --gray-400: #9aa5b1;
  --gray-200: #e4e7eb;
  --gray-100: #f5f7fa;
  --white: #ffffff;
  --radius: 14px;
  --shadow: 0 6px 24px rgba(31, 41, 51, 0.08);
  --maxw: 1080px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--gray-100);
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; }

/* ---------- 顶部导航 ---------- */
.topnav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 24px;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--gray-200);
}
.topnav .brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 18px; color: var(--green-700); }
.topnav .brand .logo { font-size: 22px; }
.topnav .navlinks { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.topnav .navlinks a {
  padding: 8px 14px; border-radius: 10px; font-size: 14px; color: var(--gray-600); font-weight: 600;
  transition: all .15s;
}
.topnav .navlinks a:hover { background: var(--green-100); color: var(--green-700); }
.topnav .navlinks a.active { background: var(--green-700); color: #fff; }
.topnav .userbox { display: flex; align-items: center; gap: 10px; }
.topnav .uname { font-size: 14px; color: var(--gray-600); font-weight: 600; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 20px; border-radius: 12px; border: none; cursor: pointer;
  font-size: 15px; font-weight: 700; transition: all .15s; font-family: inherit;
}
.btn-primary { background: var(--green-700); color: #fff; }
.btn-primary:hover { background: var(--green-900); }
.btn-ghost { background: var(--gray-100); color: var(--gray-600); }
.btn-ghost:hover { background: var(--gray-200); }
.btn-orange { background: var(--orange); color: #fff; }
.btn-orange:hover { filter: brightness(0.95); }
.btn-sm { padding: 7px 14px; font-size: 13px; }
.btn-block { width: 100%; }

/* ---------- 布局 ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 32px 24px 64px; }
.section-title { font-size: 22px; font-weight: 800; margin-bottom: 6px; }
.section-sub { color: var(--gray-600); margin-bottom: 24px; }

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 860px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

.card {
  background: #fff; border-radius: var(--radius); padding: 22px;
  box-shadow: var(--shadow); border: 1px solid var(--gray-200);
  transition: transform .15s, box-shadow .15s;
}
.card.link:hover { transform: translateY(-3px); box-shadow: 0 12px 30px rgba(31,41,51,.12); }
.card .icon { font-size: 34px; }
.card h3 { font-size: 18px; margin: 10px 0 6px; }
.card p { color: var(--gray-600); font-size: 14px; }
.card .meta { margin-top: 12px; font-size: 13px; color: var(--green-700); font-weight: 700; }

/* ---------- 登录页 ---------- */
.auth-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 24px;
  background: linear-gradient(135deg, #e8f5e9 0%, #f5f7fa 60%); }
.auth-card { background: #fff; border-radius: 20px; box-shadow: var(--shadow); padding: 40px; width: 100%; max-width: 420px; }
.auth-card .brand { text-align: center; margin-bottom: 8px; }
.auth-card .brand .logo { font-size: 46px; }
.auth-card h1 { font-size: 24px; text-align: center; color: var(--green-700); margin-bottom: 4px; }
.auth-card .sub { text-align: center; color: var(--gray-600); margin-bottom: 28px; font-size: 14px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; font-weight: 700; color: var(--gray-600); margin-bottom: 6px; }
.field input {
  width: 100%; padding: 13px 14px; border: 1px solid var(--gray-200); border-radius: 12px;
  font-size: 15px; font-family: inherit; outline: none; transition: border .15s;
}
.field input:focus { border-color: var(--green-500); }
.hint { font-size: 12px; color: var(--gray-400); margin-top: 6px; }
.err { color: #e53935; font-size: 13px; margin-top: 10px; min-height: 18px; text-align: center; }

/* ---------- 进度条 ---------- */
.progress { background: var(--gray-200); border-radius: 999px; height: 10px; overflow: hidden; }
.progress > span { display: block; height: 100%; background: linear-gradient(90deg, var(--green-500), var(--green-700)); border-radius: 999px; transition: width .4s; }
.progress-label { font-size: 13px; color: var(--gray-600); margin-top: 6px; }

/* ---------- 课时列表 ---------- */
.module { margin-bottom: 28px; }
.module > h3 { font-size: 16px; color: var(--gray-600); margin-bottom: 12px; padding-left: 10px; border-left: 4px solid var(--green-500); }
.lesson {
  display: flex; align-items: center; gap: 14px; padding: 16px 18px; background: #fff;
  border: 1px solid var(--gray-200); border-radius: 12px; margin-bottom: 10px; transition: all .15s;
}
.lesson:hover { border-color: var(--green-500); box-shadow: var(--shadow); }
.lesson .num { flex: none; width: 38px; height: 38px; border-radius: 10px; background: var(--green-100); color: var(--green-700);
  display: flex; align-items: center; justify-content: center; font-weight: 800; }
.lesson .info { flex: 1; }
.lesson .info h4 { font-size: 15px; }
.lesson .info p { font-size: 13px; color: var(--gray-600); }
.lesson .dur { font-size: 12px; color: var(--gray-400); white-space: nowrap; }
.lesson .badge { font-size: 11px; padding: 3px 9px; border-radius: 999px; background: var(--gray-100); color: var(--gray-400); }
.lesson .badge.ready { background: var(--green-100); color: var(--green-700); }

/* ---------- PPT 查看器 ---------- */
.viewer { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.viewer-bar { display: flex; align-items: center; justify-content: space-between; padding: 12px 16px; border-bottom: 1px solid var(--gray-200); background: var(--gray-100); }
.viewer-stage { position: relative; background: #111; min-height: 420px; display: flex; align-items: center; justify-content: center; }
.viewer-stage img { max-width: 100%; max-height: 70vh; }
.viewer-stage .empty { color: #888; padding: 80px 20px; text-align: center; }
.viewer-nav { display: flex; align-items: center; gap: 10px; }
.viewer-nav button { background: #fff; border: 1px solid var(--gray-200); border-radius: 10px; padding: 8px 14px; cursor: pointer; font-size: 14px; font-weight: 700; }
.viewer-nav button:hover { background: var(--green-100); }
.viewer-thumbs { display: flex; gap: 8px; padding: 12px; overflow-x: auto; background: var(--gray-100); }
.viewer-thumbs img { height: 64px; border-radius: 8px; cursor: pointer; border: 2px solid transparent; opacity: .7; }
.viewer-thumbs img.active { border-color: var(--green-500); opacity: 1; }

/* ---------- 资料列表 ---------- */
.material { display: flex; align-items: center; gap: 12px; padding: 14px 16px; border: 1px solid var(--gray-200); border-radius: 12px; margin-bottom: 10px; background: #fff; }
.material .fi { font-size: 24px; }
.material .mt { flex: 1; }
.material .mt b { font-size: 14px; }
.material .mt span { display: block; font-size: 12px; color: var(--gray-400); }
.pending { color: var(--gray-400); font-size: 14px; padding: 20px; text-align: center; background: var(--gray-100); border-radius: 12px; }

/* ---------- 能力清单 ---------- */
.cap-tier { margin-bottom: 26px; }
.cap-tier-title { font-size: 16px; margin-bottom: 12px; padding: 6px 14px; border-radius: 10px; display: inline-block; font-weight: 800; }
.cap-tier-title.tier-basic { background: #e8f5e9; color: #2e7d32; }
.cap-tier-title.tier-mid   { background: #e3f2fd; color: #1565c0; }
.cap-tier-title.tier-adv   { background: #fce4ec; color: #ad1457; }
.cap-item { background: #fff; border: 1px solid var(--gray-200); border-radius: 12px; padding: 16px 18px; margin-bottom: 10px; }
.cap-item .cap-head { display: flex; align-items: flex-start; gap: 12px; }
.cap-item .cap-name { font-weight: 700; font-size: 15px; }
.cap-item .cap-desc { font-size: 13px; color: var(--gray-600); margin-top: 4px; }
.cap-tag { font-size: 11px; font-weight: 600; color: var(--gray-400); background: var(--gray-100); padding: 1px 8px; border-radius: 999px; margin-left: 8px; }
.cap-checks { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 14px; padding-top: 12px; border-top: 1px dashed var(--gray-200); }
.cap-checks label { display: flex; align-items: center; gap: 7px; font-size: 13px; font-weight: 600; cursor: pointer; }
.cap-checks input { width: 18px; height: 18px; accent-color: var(--green-700); cursor: pointer; }
.cap-checks .teacher { color: var(--orange); }
.cap-na { font-size: 13px; color: var(--gray-400); font-weight: 600; }
.cap-status { font-size: 12px; font-weight: 700; padding: 3px 10px; border-radius: 999px; }
.cap-status.pass { background: var(--green-100); color: var(--green-700); }
.cap-status.wait { background: #fff3e0; color: var(--orange); }
.cap-status.none { background: var(--gray-100); color: var(--gray-400); }

/* 证书等级卡片 */
.cert-card { display: flex; align-items: center; gap: 18px; background: #fff; border: 1px solid var(--gray-200); border-radius: 14px; padding: 18px 22px; margin-bottom: 22px; box-shadow: 0 2px 10px rgba(0,0,0,.04); }
.cert-icon { font-size: 42px; line-height: 1; flex: none; }
.cert-body { flex: 1; }
.cert-name { font-size: 20px; font-weight: 800; }
.cert-sub { font-size: 13px; color: var(--gray-600); margin-top: 2px; }
.cert-hint { font-size: 13px; color: var(--gray-600); margin-top: 6px; }
.cert-hint b { color: var(--green-700); }

/* 能力清单交互补充 */
.cap-no { display: inline-flex; align-items: center; justify-content: center; width: 24px; height: 24px; border-radius: 7px; background: var(--green-100); color: var(--green-700); font-size: 12px; font-weight: 700; flex: none; margin-right: 8px; }
.cap-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.cap-head .cap-name { display: flex; align-items: center; }
.cap-checks input:disabled { cursor: not-allowed; opacity: .55; }
.cap-checks label:has(input:disabled) { opacity: .6; }
.staff-bar { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; background: #fff; border: 1px solid var(--gray-200); border-radius: 12px; padding: 14px 18px; margin-bottom: 20px; }
.staff-bar select { padding: 8px 12px; border: 1px solid var(--gray-200); border-radius: 10px; font-size: 14px; font-family: inherit; background: #fff; }
.staff-label { font-weight: 700; color: var(--gray-600); }
.staff-hint { font-size: 13px; color: var(--gray-600); }
.staff-hint b { color: var(--green-700); }
.overview { margin-bottom: 26px; }
.ov-table { width: 100%; border-collapse: collapse; background: #fff; border: 1px solid var(--gray-200); border-radius: 12px; overflow: hidden; font-size: 14px; }
.ov-table th, .ov-table td { padding: 11px 14px; text-align: left; border-bottom: 1px solid var(--gray-200); }
.ov-table th { background: var(--green-100); color: var(--green-700); font-weight: 800; }
.ov-table tbody tr { cursor: pointer; transition: background .12s; }
.ov-table tbody tr:hover { background: var(--gray-100); }
.ov-table tbody tr.active { background: var(--green-100); }
.io-note { font-size: 12px; color: var(--gray-400); margin-left: 6px; }

/* ---------- 公告条 ---------- */
.announce { background: #fff8e1; border: 1px solid #ffe082; color: #8d6e00; padding: 12px 24px; font-size: 14px; text-align: center; }

/* ---------- 工具条 ---------- */
.toolbar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 20px; align-items: center; }

/* ---------- 页脚 ---------- */
.foot { text-align: center; color: var(--gray-400); font-size: 13px; padding: 32px 24px; }

.tag { display: inline-block; font-size: 12px; padding: 3px 10px; border-radius: 999px; background: var(--green-100); color: var(--green-700); font-weight: 700; }

/* ---------- 课程目录（手风琴）---------- */
.course-catalog { margin: 24px 0; }
.course-catalog .catalog-title { font-size: 18px; font-weight: 800; color: var(--green-700); margin-bottom: 14px; display: flex; align-items: center; gap: 8px; }
.catalog-list { display: flex; flex-direction: column; gap: 8px; }
.catalog-lesson {
  background: #fff; border: 1px solid var(--gray-200); border-radius: 12px;
  overflow: hidden; transition: border-color .15s, box-shadow .15s;
}
.catalog-lesson:hover { border-color: var(--green-500); box-shadow: var(--shadow); }
.catalog-lesson[open] { border-color: var(--green-500); }
.catalog-summary {
  display: flex; align-items: center; gap: 12px; padding: 16px 18px;
  cursor: pointer; user-select: none; list-style: none;
}
.catalog-summary::-webkit-details-marker { display: none; }
.catalog-summary::marker { content: ""; }
.catalog-num {
  flex: none; width: 34px; height: 34px; border-radius: 10px;
  background: linear-gradient(135deg, var(--green-500), var(--green-700));
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 15px;
}
.catalog-name { flex: 1; font-size: 15px; font-weight: 700; color: var(--ink); }
.catalog-dur { font-size: 12px; color: var(--gray-400); white-space: nowrap; background: var(--gray-100); padding: 3px 10px; border-radius: 999px; }
.catalog-arrow { font-size: 14px; color: var(--gray-400); transition: transform .2s; }
.catalog-lesson[open] .catalog-arrow { transform: rotate(90deg); color: var(--green-700); }
.catalog-chapters { padding: 0 18px 16px 58px; }
.catalog-chapters ol { margin: 0; padding-left: 20px; }
.catalog-chapters li {
  font-size: 14px; line-height: 2; color: var(--gray-600);
  border-bottom: 1px dashed var(--gray-200);
  padding: 4px 0;
}
.catalog-chapters li:last-child { border-bottom: none; }
.chapter-img { margin: 8px 0 2px; }
.chapter-img img { display: block; max-width: 360px; width: 100%; border-radius: 8px; border: 1px solid var(--gray-200); box-shadow: var(--shadow); cursor: pointer; }

.catalog-empty { padding: 14px 18px; font-size: 13px; color: var(--gray-400); text-align: center; background: var(--gray-100); margin: 0 10px 12px; border-radius: 10px; }

/* 课程目录内的课件下载区块（第7项起） */
.catalog-mats { padding: 4px 18px 16px 58px; }
.catalog-mats-title { font-size: 14px; font-weight: 700; color: var(--green-700); margin: 6px 0 10px; }
.catalog-mats .material { margin-bottom: 8px; padding: 10px 12px; background: #fff; }
.catalog-mats .material:last-child { margin-bottom: 0; }

/* ---------- YouTube 内嵌播放器 ---------- */
.yt-wrap { position: relative; width: 100%; padding-top: 56.25%; border-radius: var(--radius); overflow: hidden; background: #000; box-shadow: var(--shadow); }
.yt-wrap iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: 0; }
.video-item { margin-bottom: 20px; }
.video-title { font-weight: 700; margin-bottom: 8px; font-size: 15px; }
.road-card { background: var(--white); border: 1px solid var(--gray-200); border-radius: var(--radius); padding: 18px; margin-bottom: 20px; box-shadow: var(--shadow); }
.road-head { margin-bottom: 12px; }
.road-head h4 { margin: 0 0 6px; font-size: 17px; }
.road-meta { display: flex; gap: 10px; align-items: center; color: var(--gray-600); font-size: 13px; flex-wrap: wrap; }
.pending { color: var(--gray-400); font-size: 14px; padding: 18px; text-align: center; background: var(--gray-100); border-radius: var(--radius); border: 1px dashed var(--gray-200); }

/* 移动端导航折叠 */
@media (max-width: 720px) {
  .topnav { flex-wrap: wrap; gap: 8px; padding: 10px 14px; }
  .topnav .navlinks { order: 3; width: 100%; justify-content: flex-start; }
  .wrap { padding: 20px 14px 48px; }
}

/* ---------- 课件正文（直播回放 lesson 页）---------- */
.back { display: inline-block; margin: 8px 0 14px; color: var(--green-700); font-weight: 700; font-size: 14px; }
.back:hover { text-decoration: underline; }
.block { background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius); padding: 24px; margin-bottom: 22px; box-shadow: var(--shadow); }
.block-title { font-size: 18px; font-weight: 800; color: var(--green-700); margin-bottom: 14px; display: flex; align-items: center; gap: 8px; }
.block p.note { color: var(--gray-600); font-size: 14px; margin-bottom: 14px; }

/* 自测问答 */
.qa-list { display: flex; flex-direction: column; gap: 10px; }
.qa { border: 1px solid var(--gray-200); border-radius: 12px; padding: 12px 16px; background: var(--gray-100); }
.qa summary { cursor: pointer; font-size: 15px; font-weight: 700; color: var(--ink); list-style: none; }
.qa summary::-webkit-details-marker { display: none; }
.qa summary::before { content: "▸"; color: var(--green-500); margin-right: 8px; font-weight: 900; }
.qa[open] summary::before { content: "▾"; }
.qa .ans { margin-top: 10px; padding-top: 10px; border-top: 1px dashed var(--gray-200); font-size: 14px; color: var(--gray-600); line-height: 1.8; }

.essay { margin: 0 0 0 20px; }
.essay li { font-size: 14px; color: var(--gray-600); margin-bottom: 10px; line-height: 1.7; }

/* 术语表 */
.gloss { width: 100%; border-collapse: collapse; font-size: 14px; }
.gloss th, .gloss td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--gray-200); vertical-align: top; }
.gloss th { background: var(--green-100); color: var(--green-700); font-weight: 800; }
.gloss td:first-child { font-weight: 700; color: var(--ink); white-space: nowrap; }

/* 配图与说明 */
.fig { width: 100%; border-radius: 12px; border: 1px solid var(--gray-200); margin-top: 6px; }
.cap { font-size: 13px; color: var(--gray-400); margin-top: 8px; text-align: center; }

/* PDF 内嵌查看器 */
.pdf-wrap { width: 100%; border: 1px solid var(--gray-200); border-radius: 12px; overflow: hidden; background: #f0f0f0; }
.pdf-wrap iframe { display: block; width: 100%; height: 80vh; border: 0; }
.pdf-bar { display: flex; gap: 10px; align-items: center; margin-top: 12px; flex-wrap: wrap; }

/* 课件图片画廊（PDF 转图后逐页翻阅）*/
.pv-main { background: #111; border-radius: 12px; overflow: hidden; text-align: center; padding: 8px; }
.pv-main img { max-width: 100%; max-height: 72vh; }
.pv-thumbs { display: flex; gap: 8px; overflow-x: auto; padding: 12px 2px; }
.pv-thumbs img { height: 64px; border-radius: 8px; cursor: pointer; border: 2px solid transparent; opacity: .6; flex: none; transition: opacity .15s, border-color .15s; }
.pv-thumbs img:hover, .pv-thumbs img.active { opacity: 1; border-color: var(--green-500); }

/* ---------- 腾讯文档智能表格入口卡片 ---------- */
.smart-sheet-card {
  display: flex; align-items: center; gap: 16px;
  background: linear-gradient(135deg, #e8f5e9 0%, #fff 60%);
  border: 2px solid var(--green-500); border-radius: 14px;
  padding: 18px 22px; margin-bottom: 24px;
  box-shadow: 0 4px 16px rgba(46, 125, 50, 0.1);
  transition: transform .15s, box-shadow .15s;
  text-decoration: none; color: inherit;
}
.smart-sheet-card:hover { transform: translateY(-3px); box-shadow: 0 10px 28px rgba(46, 125, 50, 0.18); }
.ss-icon { font-size: 36px; line-height: 1; flex: none; }
.ss-body { flex: 1; }
.ss-title { font-size: 16px; font-weight: 800; color: var(--green-700); margin-bottom: 3px; }
.ss-desc { font-size: 13px; color: var(--gray-600); }
.ss-arrow { font-size: 22px; color: var(--green-500); font-weight: 900; flex: none; transition: transform .15s; }
.smart-sheet-card:hover .ss-arrow { transform: translateX(4px); }

/* ---------- 语言切换器（中英双语） ---------- */
.lang-switch{position:fixed;top:14px;right:14px;z-index:900;display:flex;gap:4px;
  background:#fff;border:1px solid rgba(26,26,46,.12);border-radius:100px;padding:4px;
  box-shadow:0 2px 8px rgba(26,26,46,.10)}
.lang-switch .lang-btn{font-family:inherit;font-size:13px;font-weight:600;border:none;
  background:transparent;color:#6A6A85;padding:6px 14px;border-radius:100px;cursor:pointer;transition:.15s}
.lang-switch .lang-btn:hover{color:#1A1A2E}
.lang-switch .lang-btn.active{background:#FF5B1F;color:#fff}