:root {
  --paper: #FBF7EF;
  --paper2: #F4ECDD;
  --paper-dark: #E9DEC5;
  --surface: #FFFCF6;
  --ink: #1C1B19;
  --ink-soft: #4a463f;
  --ink-faint: #8a8378;
  --cinnabar: #A4361C;
  --cinnabar-dark: #7f2812;
  --dai: #2C4A43;
  --dai-light: #3d635a;
  --gold: #B5893B;
  --gold-light: #d4aa5a;
  --line: #e3d8c2;
  --line2: #d8c9ab;
  --shadow: 0 22px 50px -18px rgba(28, 27, 25, .38);
  --shadow-sm: 0 8px 22px -10px rgba(28, 27, 25, .28);
  --radius: 14px;
  --radius-sm: 10px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
}

html {
  font-size: 16px;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.75;
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 34px, rgba(181, 137, 59, .06) 35px),
    radial-gradient(circle at 50% 0%, rgba(244, 236, 221, .6), transparent 60%);
  min-height: 100vh;
}

h1, h2, h3, h4, .serif {
  font-family: "Noto Serif SC", "Songti SC", serif;
  margin: 0;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: var(--ink);
}

/* ===== 起始封面 ===== */
.cover {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(circle at 50% 16%, rgba(181, 137, 59, .12), transparent 55%),
    linear-gradient(160deg, #FBF7EF 0%, #F4ECDD 55%, #E9DEC5 100%);
  overflow: hidden;
  transition: opacity .7s ease, visibility .7s ease;
}
.cover.hide { opacity: 0; visibility: hidden; pointer-events: none; }

.cover-bg {
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 33px, rgba(181,137,59,.05) 34px),
    repeating-linear-gradient(90deg, transparent, transparent 33px, rgba(181,137,59,.04) 34px);
  -webkit-mask-image: radial-gradient(circle at 50% 42%, #000 35%, transparent 78%);
  mask-image: radial-gradient(circle at 50% 42%, #000 35%, transparent 78%);
}

.cover-ink { position: absolute; inset: 0; pointer-events: none; }
.ink-dot {
  position: absolute;
  width: 340px; height: 340px;
  left: -90px; bottom: -120px;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 40%, rgba(44,74,67,.10), transparent 70%);
}
.ink-dot.b {
  width: 260px; height: 260px;
  right: -80px; top: -70px; left: auto; bottom: auto;
  background: radial-gradient(circle at 60% 60%, rgba(164,54,28,.08), transparent 70%);
}

.cover-inner {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  animation: coverIn .9s ease both;
}
@keyframes coverIn {
  from { opacity: 0; transform: translateY(22px); }
  to { opacity: 1; transform: none; }
}

.cover-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  animation: coverIn .9s ease both;
}
.cover-logo {
  position: relative;
  width: 64px; height: 64px;
  border: 2px dashed var(--line2);
  border-radius: 14px;
  display: grid; place-items: center;
  color: var(--ink-faint);
  font-family: "Noto Serif SC", serif;
  font-size: 13px;
  letter-spacing: 1px;
  background: rgba(255, 255, 255, .5);
}
.cover-logo.has-img { border: none; background: transparent; }
.cover-logo-img { display: none; width: 64px; height: 64px; border-radius: 14px; object-fit: contain; }
.cover-logo.has-img .cover-logo-img { display: block; }
.cover-logo.has-img .cover-logo-text { display: none; }
.cover-org {
  font-family: "Noto Serif SC", serif;
  font-size: 13px;
  color: var(--ink-faint);
  letter-spacing: 3px;
  padding: 4px 14px;
  border: 1px dashed var(--line2);
  border-radius: 100px;
  white-space: nowrap;
}
.cover-main-logo {
  width: clamp(122px, 31vw, 168px); height: auto;
  display: block;
  border-radius: 16px;
  margin-bottom: 34px;
  filter: drop-shadow(0 12px 26px rgba(28, 27, 25, .14));
  animation: sealPop .7s .25s ease both;
  background: transparent;
}
@keyframes sealPop {
  0% { transform: scale(.4) rotate(-12deg); opacity: 0; }
  70% { transform: scale(1.08) rotate(2deg); }
  100% { transform: scale(1) rotate(0); opacity: 1; }
}

.cover-title {
  font-family: "Noto Serif SC", serif;
  font-weight: 900;
  font-size: clamp(48px, 13vw, 104px);
  letter-spacing: clamp(6px, 2vw, 18px);
  color: var(--ink);
  margin: 0;
  line-height: 1.05;
  text-shadow: 0 2px 0 rgba(255, 255, 255, .6);
  animation: coverIn .9s .15s ease both;
}
.cover-sub {
  font-family: "Noto Serif SC", serif;
  font-size: clamp(17px, 4.4vw, 28px);
  letter-spacing: clamp(4px, 1.4vw, 12px);
  color: var(--ink);
  margin-top: 0;
  font-weight: 700;
  animation: coverIn .9s .35s ease both;
}
.cover-rule {
  width: clamp(80px, 30vw, 180px);
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  margin: 22px 0 18px;
  animation: coverIn .9s .4s ease both;
}
.cover-slogan {
  font-size: clamp(14px, 3.6vw, 19px);
  color: var(--ink-soft);
  letter-spacing: 2px;
  margin: 0 0 44px;
  animation: coverIn .9s .5s ease both;
}
.cover-enter {
  border: none;
  background: var(--cinnabar);
  color: #fff;
  font-family: "Noto Serif SC", serif;
  font-weight: 700;
  font-size: clamp(15px, 3.6vw, 19px);
  letter-spacing: 4px;
  padding: 16px 52px;
  border-radius: 100px;
  cursor: pointer;
  box-shadow: 0 12px 30px -14px rgba(164, 54, 28, .5);
  transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
  animation: coverIn .9s .6s ease both;
}
.cover-enter:hover {
  background: var(--cinnabar-dark);
  transform: translateY(-2px);
  box-shadow: 0 16px 36px -14px rgba(164, 54, 28, .55);
}
.cover-enter:active { transform: translateY(0); }
.cover-qr {
  margin-top: 28px;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  animation: coverIn .9s .76s ease both;
}
.cover-qr-img {
  width: 104px; height: 104px;
  padding: 6px;
  background: var(--surface);
  border: 1px solid var(--line2);
  border-radius: 12px;
  box-shadow: 0 10px 24px -14px rgba(28, 27, 25, .35);
  overflow: hidden;
}
.cover-qr-img img,
.cover-qr-img canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
  border-radius: 4px;
}
.cover-qr-tx {
  font-family: "Noto Sans SC", sans-serif;
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--ink-faint);
}
.cover-foot {
  margin-top: 34px;
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--ink-faint);
  animation: coverIn .9s .75s ease both;
}
@media (max-width: 640px) {
  .cover-main-logo { width: 130px; margin-bottom: 18px; }
  .cover-foot { margin-top: 26px; }
}

/* 顶部导航 */
.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(251, 247, 239, .96);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line2);
  box-shadow: 0 10px 30px -18px rgba(28, 27, 25, .15);
  padding: 14px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  object-fit: contain;
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}

.brand-name {
  font-family: "Noto Serif SC", serif;
  font-weight: 900;
  font-size: 22px;
  letter-spacing: 3px;
  color: var(--ink);
}

.brand-sub {
  font-size: 12px;
  color: var(--ink-faint);
  letter-spacing: 1.5px;
  margin-top: 2px;
}

.tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  background: var(--paper2);
  padding: 6px;
  border-radius: 100px;
  border: 1px solid var(--line);
}

.tab {
  border: none;
  background: transparent;
  color: var(--ink-soft);
  padding: 9px 22px;
  border-radius: 100px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all .22s ease;
  position: relative;
}

.tab:hover {
  color: var(--cinnabar);
  background: rgba(164, 54, 28, .05);
}

.tab.active {
  background: var(--ink);
  color: var(--paper);
  box-shadow: 0 4px 14px -4px rgba(28, 27, 25, .35);
}

/* 主容器 */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 28px;
}

.panel {
  display: none;
  animation: fadeIn .32s ease;
}

.panel.active {
  display: block;
}

.hidden {
  display: none !important;
}

/* 老师登录按钮 */
.top-actions {
  margin-left: auto;
}
.login-btn {
  border: 1px solid var(--cinnabar);
  background: transparent;
  color: var(--cinnabar);
  padding: 8px 18px;
  border-radius: 100px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 1px;
  transition: all .22s ease;
  white-space: nowrap;
}
.login-btn:hover {
  background: rgba(164, 54, 28, .08);
}
.login-btn.on {
  background: var(--cinnabar);
  color: #fff;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

/* 章节标题 */
.sec-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 22px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line2);
}

.sec-head h2 {
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 2px;
}

.sec-head .num {
  font-family: "Noto Serif SC", serif;
  font-size: 13px;
  color: var(--cinnabar);
  border: 1px solid var(--cinnabar);
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  flex-shrink: 0;
}

.sec-head .rule {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--line2), transparent);
}

/* 通用按钮 */
.btn {
  border: 1px solid var(--line2);
  background: var(--surface);
  color: var(--ink);
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 500;
  transition: all .18s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn:hover {
  border-color: var(--cinnabar);
  color: var(--cinnabar);
  transform: translateY(-1px);
}

.btn.primary {
  background: var(--cinnabar);
  color: #fff;
  border-color: var(--cinnabar);
  box-shadow: 0 8px 20px -8px rgba(164, 54, 28, .45);
}

.btn.primary:hover {
  background: var(--cinnabar-dark);
  border-color: var(--cinnabar-dark);
  color: #fff;
}

.btn.ghost {
  background: var(--dai);
  color: #fff;
  border-color: var(--dai);
}

.btn.ghost:hover {
  background: var(--dai-light);
  border-color: var(--dai-light);
  color: #fff;
}

.btn:disabled {
  opacity: .55;
  cursor: not-allowed;
  transform: none !important;
}

/* 课程库 */
.lib-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}

.grade-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.grade-tabs button {
  border: 1px solid var(--line2);
  background: var(--surface);
  color: var(--ink-soft);
  padding: 8px 18px;
  border-radius: 100px;
  cursor: pointer;
  font-family: inherit;
  font-size: 13px;
  transition: all .18s ease;
}

.grade-tabs button:hover {
  border-color: var(--cinnabar);
  color: var(--cinnabar);
}

.grade-tabs button.active {
  background: var(--cinnabar);
  color: #fff;
  border-color: var(--cinnabar);
  box-shadow: 0 6px 16px -6px rgba(164, 54, 28, .4);
}

.search {
  border: 1px solid var(--line2);
  background: var(--surface);
  border-radius: 100px;
  padding: 10px 18px;
  font-family: inherit;
  font-size: 14px;
  min-width: 260px;
  color: var(--ink);
  outline: none;
  transition: all .18s ease;
}

.search:focus {
  border-color: var(--cinnabar);
  box-shadow: 0 0 0 4px rgba(164, 54, 28, .08);
}

.search.wide {
  flex: 1;
  min-width: 200px;
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 18px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  cursor: pointer;
  transition: all .22s ease;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  background: var(--cinnabar);
  opacity: 0;
  transition: opacity .22s ease;
}

.card::after {
  content: "开课";
  position: absolute;
  right: 14px;
  top: 14px;
  font-size: 11px;
  color: var(--ink-faint);
  border: 1px solid var(--line);
  padding: 2px 8px;
  border-radius: 100px;
  opacity: 0;
  transform: translateX(8px);
  transition: all .22s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: var(--line2);
}

.card:hover::before {
  opacity: 1;
}

.card:hover::after {
  opacity: 1;
  transform: translateX(0);
}

.card-acts {
  margin-top: 12px;
  display: flex;
  gap: 8px;
}

.card .lv {
  font-size: 11px;
  color: var(--cinnabar);
  font-weight: 700;
  letter-spacing: 1.5px;
  margin-bottom: 6px;
}

.card h3 {
  font-size: 18px;
  line-height: 1.45;
  margin-bottom: 6px;
  color: var(--ink);
}

.card .au {
  font-size: 13px;
  color: var(--ink-faint);
  margin-bottom: 10px;
}

.card .ty {
  display: inline-block;
  font-size: 11px;
  background: var(--paper2);
  color: var(--dai);
  padding: 3px 10px;
  border-radius: 100px;
  margin-bottom: 10px;
  font-weight: 500;
}

.card .fo {
  font-size: 13.5px;
  color: var(--ink-soft);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 空状态 */
.empty {
  color: var(--ink-faint);
  text-align: center;
  padding: 80px 20px;
  font-size: 15px;
  background: rgba(255, 255, 255, .55);
  border: 1px dashed var(--line2);
  border-radius: var(--radius);
}

.empty .big {
  font-family: "Noto Serif SC", serif;
  font-size: 48px;
  color: var(--line2);
  margin-bottom: 12px;
}

/* 上课 */
.lesson-top {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.back {
  border: 1px solid var(--line2);
  background: var(--surface);
  border-radius: 100px;
  padding: 8px 18px;
  cursor: pointer;
  font-family: inherit;
  font-weight: 500;
  transition: all .18s ease;
}

.back:hover {
  border-color: var(--cinnabar);
  color: var(--cinnabar);
}

.lesson-meta {
  font-size: 14px;
  color: var(--ink-soft);
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 8px 18px;
  border-radius: 100px;
}

.lesson-meta b {
  font-family: "Noto Serif SC", serif;
  font-size: 17px;
  color: var(--ink);
}

/* 阶段轨道 */
.stage-track {
  display: flex;
  gap: 12px;
  margin-bottom: 22px;
  position: relative;
}

.stage-track::before {
  content: "";
  position: absolute;
  top: 24px;
  left: 40px;
  right: 40px;
  height: 2px;
  background: var(--line2);
  z-index: 0;
}

.stage-track .st {
  flex: 1;
  min-width: 140px;
  border: 1px solid var(--line2);
  border-radius: var(--radius);
  padding: 16px;
  background: var(--surface);
  cursor: pointer;
  transition: all .22s ease;
  position: relative;
  z-index: 1;
}

.stage-track .st:hover {
  border-color: var(--cinnabar);
}

.stage-track .st.active {
  border-color: var(--cinnabar);
  box-shadow: 0 12px 30px -12px rgba(164, 54, 28, .25);
  background: linear-gradient(180deg, #fff, #fff8f5);
}

.stage-track .st.done {
  border-color: var(--dai);
  background: linear-gradient(180deg, #fff, #f0f6f4);
}

.stage-track .st .n {
  font-size: 12px;
  color: var(--cinnabar);
  font-weight: 700;
  letter-spacing: 1px;
}

.stage-track .st.done .n {
  color: var(--dai);
}

.stage-track .st .t {
  font-family: "Noto Serif SC", serif;
  font-size: 18px;
  font-weight: 700;
  margin-top: 4px;
}

.stage-view {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  position: relative;
}

.stage-view::before {
  content: "";
  position: absolute;
  left: 28px;
  top: 28px;
  bottom: 28px;
  width: 1px;
  background: linear-gradient(180deg, var(--line2), transparent);
}

.stage-view h2 {
  font-size: 26px;
  margin-bottom: 6px;
  padding-left: 24px;
}

.stage-view .goal {
  background: var(--paper2);
  border-left: 3px solid var(--gold);
  padding: 12px 18px;
  border-radius: 8px;
  margin: 14px 0 22px 24px;
  font-size: 14px;
  color: var(--ink-soft);
}

.kv {
  margin: 18px 0;
  padding-left: 24px;
}

.kv .k {
  font-weight: 700;
  color: var(--cinnabar);
  font-size: 13px;
  letter-spacing: 1.5px;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.kv .k::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cinnabar);
}

.kv .v {
  white-space: pre-wrap;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.9;
}

/* 温故知新 · 课后练习列表 */
.rw {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--line);
}
.rw:last-child { border-bottom: none; }
.rw .rn {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--cinnabar);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  display: grid;
  place-items: center;
  margin-top: 2px;
}
#markReview { margin-top: 22px; }

.done-flag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-left: 12px;
  font-size: 13px;
  color: var(--dai);
  font-weight: 700;
  background: #eef3f0;
  padding: 4px 12px;
  border-radius: 100px;
}

.lesson-actions {
  margin-top: 24px;
  display: flex;
  justify-content: flex-end;
}

/* 签到 / 表单 */
.form-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 18px;
  background: var(--surface);
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.form-row label {
  font-size: 13px;
  color: var(--ink-faint);
  font-weight: 700;
  letter-spacing: 1px;
}

.form-row select,
.form-row input[type="date"] {
  border: 1px solid var(--line2);
  background: var(--paper);
  border-radius: 8px;
  padding: 9px 12px;
  font-family: inherit;
  font-size: 14px;
  color: var(--ink);
  outline: none;
  min-width: 120px;
}

.form-row select:focus,
.form-row input:focus {
  border-color: var(--cinnabar);
}

.checkin-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 12px;
  margin: 8px 0 20px;
}

/* 未登录引导：学员名单属儿童隐私，公网部署后须登录才可见 */
.login-gate {
  grid-column: 1 / -1;
  display: flex; flex-direction: column; align-items: center; gap: 14px;
  padding: 46px 20px;
  background: var(--surface);
  border: 1px dashed var(--line2);
  border-radius: var(--radius);
  text-align: center;
}
.login-gate .lg-ico { font-size: 30px; opacity: .5; }
.login-gate .lg-t { font-size: 14px; color: var(--ink-soft); letter-spacing: 1px; }

.stu {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  background: var(--surface);
  cursor: pointer;
  transition: all .18s ease;
}

.stu:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.stu .nm {
  font-size: 15px;
  font-weight: 500;
}

.stu .st-ico {
  font-size: 13px;
  color: var(--ink-faint);
}

.stu.present {
  border-color: var(--dai);
  background: linear-gradient(180deg, #eef3f0, #fff);
}

.stu.present .st-ico {
  color: var(--dai);
  font-weight: 700;
}

.stu.absent {
  border-color: var(--line2);
  background: #f6f4f0;
  opacity: .7;
}

.stu.absent .st-ico {
  color: #a33;
}

.msg {
  font-size: 13px;
  color: var(--dai);
  font-weight: 700;
  min-height: 20px;
  margin-top: 8px;
}

.msg.err {
  color: var(--cinnabar);
}

.ta {
  width: 100%;
  min-height: 110px;
  border: 1px solid var(--line2);
  border-radius: var(--radius);
  padding: 14px;
  font-family: inherit;
  font-size: 14px;
  color: var(--ink);
  resize: vertical;
  background: var(--surface);
  outline: none;
}

.ta:focus {
  border-color: var(--cinnabar);
  box-shadow: 0 0 0 4px rgba(164, 54, 28, .08);
}

.stars {
  cursor: pointer;
  font-size: 26px;
  color: var(--gold);
  letter-spacing: 3px;
}

.card-preview {
  background: var(--surface);
  border: 1px solid var(--line2);
  border-radius: var(--radius);
  padding: 22px;
  white-space: pre-wrap;
  font-size: 14px;
  line-height: 2;
  color: var(--ink-soft);
  margin-top: 16px;
  box-shadow: var(--shadow-sm);
  position: relative;
}

.card-preview::before {
  content: "家长卡片";
  position: absolute;
  right: 16px;
  top: -10px;
  background: var(--cinnabar);
  color: #fff;
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 100px;
  letter-spacing: 1px;
}

/* file:// 警告 */
.file-warning {
  display: none;
  background: #fff5f2;
  border: 1px solid var(--cinnabar);
  color: var(--cinnabar-dark);
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  font-size: 14px;
}

.file-warning code {
  background: var(--surface);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: "Consolas", monospace;
}

/* 底部 */
footer {
  text-align: center;
  padding: 30px 0 50px;
  color: var(--ink-faint);
  font-size: 12px;
  letter-spacing: 1px;
}
footer a {
  color: var(--ink-faint);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease;
}
footer a:hover {
  border-bottom-color: var(--ink-faint);
}

/* 响应式 */
@media (max-width: 860px) {
  .topbar {
    padding: 12px 18px;
  }
  main {
    padding: 18px;
  }
  .course-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }
  .stage-track::before {
    display: none;
  }
  .stage-track {
    flex-wrap: wrap;
  }
  .stage-track .st {
    min-width: calc(50% - 6px);
  }
}

@media (max-width: 640px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }
  .tabs {
    width: 100%;
    overflow-x: auto;
    flex-wrap: nowrap;
    border-radius: 100px;
  }
  .tab {
    white-space: nowrap;
  }
  .course-grid {
    grid-template-columns: 1fr;
  }
  .checkin-grid {
    grid-template-columns: 1fr 1fr;
  }
  .stage-track .st {
    min-width: 100%;
  }
}

/* 课时管理 */
.form-row .hint {
  font-size: 12px;
  color: var(--ink-faint);
  margin-left: auto;
}

.hours-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.hcard {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow-sm);
  transition: all .2s ease;
}

.hcard.warn {
  border-color: var(--cinnabar);
  box-shadow: 0 10px 26px -12px rgba(164, 54, 28, .3);
}

.hn {
  font-family: "Noto Serif SC", serif;
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
}

.hbar {
  height: 8px;
  background: var(--paper2);
  border-radius: 100px;
  overflow: hidden;
  margin-bottom: 8px;
}

.hfill {
  height: 100%;
  background: linear-gradient(90deg, var(--dai-light), var(--dai));
  border-radius: 100px;
  transition: width .4s ease;
}

.hcard.warn .hfill {
  background: linear-gradient(90deg, var(--cinnabar-dark), var(--cinnabar));
}

.hstat {
  font-size: 13px;
  color: var(--ink-soft);
  margin-bottom: 14px;
}

.hstat b { color: var(--dai); }
.hstat b.warn { color: var(--cinnabar); }

.hacts {
  display: flex;
  gap: 8px;
  align-items: center;
}

.hdelta {
  width: 64px;
  border: 1px solid var(--line2);
  border-radius: 8px;
  padding: 7px 10px;
  font-family: inherit;
  font-size: 14px;
  outline: none;
}

.hdelta:focus { border-color: var(--cinnabar); }

.btn.sm {
  padding: 7px 14px;
  font-size: 13px;
}
.btn.sm.edit {
  background: var(--cinnabar);
  color: #fff;
  border-color: var(--cinnabar);
}
.btn.sm.edit:hover {
  background: var(--cinnabar-dark);
  border-color: var(--cinnabar-dark);
}
.btn.sm.del { background: #b9462f; }
.btn.sm.del:hover { background: var(--cinnabar); }

.toolbar {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 6px 0 16px;
  flex-wrap: wrap;
}

/* 弹窗 */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(28, 27, 25, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  padding: 20px;
}
.modal.hidden { display: none; }
.modal-box {
  background: var(--surface);
  border: 1px solid var(--line2);
  border-radius: 14px;
  box-shadow: 0 18px 50px rgba(28, 27, 25, .32);
  width: min(420px, 100%);
  padding: 26px 28px;
}
.modal-box h3 {
  font-family: "Noto Serif SC", serif;
  color: var(--cinnabar);
  margin: 0 0 18px;
  font-size: 20px;
}
.modal-box .form-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}
.modal-box .form-row label {
  width: 80px;
  color: var(--ink-soft);
  font-size: 14px;
  flex: none;
}
.modal-box .form-row input,
.modal-box .form-row select {
  flex: 1;
  border: 1px solid var(--line2);
  border-radius: 8px;
  padding: 9px 12px;
  font-family: inherit;
  font-size: 14px;
  outline: none;
}
.modal-box .form-row input:focus,
.modal-box .form-row select:focus { border-color: var(--cinnabar); }
.modal-acts {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 20px;
}
.confirm-box p {
  margin: 0 0 8px;
  color: var(--ink-soft);
  line-height: 1.7;
  font-size: 15px;
}
.btn.danger {
  background: var(--cinnabar);
  color: #fff;
}
.btn.danger:hover { background: #8a291d; }

/* 课程编辑弹窗 */
.course-box { width: min(640px, 100%); max-height: 86vh; display: flex; flex-direction: column; }
.form-scroll { overflow-y: auto; padding-right: 6px; margin: 4px 0 8px; }
.form-scroll fieldset {
  border: 1px solid var(--line2);
  border-radius: 10px;
  padding: 10px 16px 16px;
  margin: 0 0 14px;
}
.form-scroll fieldset legend {
  font-family: "Noto Serif SC", serif;
  color: var(--dai);
  font-size: 14px;
  font-weight: 700;
  padding: 0 8px;
}
.form-scroll textarea {
  flex: 1;
  border: 1px solid var(--line2);
  border-radius: 8px;
  padding: 9px 12px;
  font-family: inherit;
  font-size: 14px;
  outline: none;
  resize: vertical;
  line-height: 1.6;
}
.form-scroll textarea:focus { border-color: var(--cinnabar); }

.sec-head.sub {
  margin-top: 30px;
}
.sec-head.sub h2 { font-size: 18px; }
.sec-head.sub .num { font-size: 11px; }

/* 签到名册课时徽标 */
.stu .hrs {
  font-size: 12px;
  color: var(--dai);
  background: #eef3f0;
  padding: 2px 9px;
  border-radius: 100px;
  font-weight: 700;
}
.stu .hrs.warn {
  color: #fff;
  background: var(--cinnabar);
}

/* 课消流水 */
.cons-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.cons {
  display: grid;
  grid-template-columns: 160px 80px 110px 1fr;
  gap: 12px;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  font-size: 13px;
  color: var(--ink-soft);
}
.cons .cts { color: var(--ink-faint); font-variant-numeric: tabular-nums; }
.cons .cn { font-weight: 700; color: var(--ink); }
.cons .cd.out { color: var(--cinnabar); font-weight: 700; }
.cons .cd.back { color: var(--dai); font-weight: 700; }
.cons .cc { color: var(--ink-faint); text-align: right; }

@media (max-width: 640px) {
  .cons { grid-template-columns: 1fr 1fr; }
  .cons .cc { text-align: left; }
  .form-row .hint { margin-left: 0; width: 100%; }
}

/* ===== 家长报告 ===== */
.report-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(132px, 1fr));
  gap: 14px;
  margin: 14px 0 20px;
}
.rp-stu {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 12px 14px;
  text-align: center;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.rp-stu:hover {
  transform: translateY(-3px);
  border-color: var(--line2);
  box-shadow: var(--shadow);
}
.rp-stu:active { transform: translateY(-1px); }
.rp-av {
  width: 46px; height: 46px;
  margin: 0 auto 10px;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--cinnabar), var(--cinnabar-dark));
  color: #fff;
  font-family: "Noto Serif SC", serif;
  font-size: 21px;
  font-weight: 700;
  display: grid; place-items: center;
  box-shadow: 0 6px 14px -6px rgba(164, 54, 28, .55);
}
.rp-nm {
  font-family: "Noto Serif SC", serif;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 4px;
}
.rp-rem { font-size: 12px; color: var(--ink-faint); letter-spacing: .5px; }
.rp-rem.warn { color: var(--cinnabar); font-weight: 700; }

/* 报告卡片 */
.report-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px 26px 20px;
  margin: 14px 0 18px;
  animation: coverIn .5s ease both;
}
.rp-head {
  display: flex; align-items: center; gap: 14px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}
.rp-h-av {
  width: 54px; height: 54px; flex: none;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--dai), var(--dai-light));
  color: #fff;
  font-family: "Noto Serif SC", serif;
  font-size: 24px; font-weight: 700;
  display: grid; place-items: center;
  box-shadow: 0 8px 18px -8px rgba(44, 74, 67, .6);
}
.rp-h-tx { flex: 1; min-width: 0; }
.rp-h-nm {
  font-family: "Noto Serif SC", serif;
  font-size: 22px; font-weight: 900;
  color: var(--ink); line-height: 1.3;
}
.rp-h-gr { font-size: 13px; color: var(--ink-faint); letter-spacing: 1px; }
.rp-h-dt { font-size: 12px; color: var(--ink-faint); font-variant-numeric: tabular-nums; }

.rp-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin: 20px 0 4px;
}
.rp-st {
  text-align: center;
  padding: 14px 8px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}
.rp-st-n {
  font-family: "Noto Serif SC", serif;
  font-size: 24px; font-weight: 900;
  color: var(--cinnabar);
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}
.rp-st.warn .rp-st-n { color: var(--cinnabar-dark); }
.rp-st-l { font-size: 12px; color: var(--ink-faint); margin-top: 4px; letter-spacing: .5px; }

.rp-sec { margin-top: 22px; }
.rp-sec-t {
  font-family: "Noto Serif SC", serif;
  font-size: 15px; font-weight: 700;
  color: var(--ink);
  padding-left: 10px;
  border-left: 3px solid var(--gold);
  margin-bottom: 10px;
}
.rp-books { display: grid; gap: 8px; }
.rp-book {
  display: flex; align-items: baseline; gap: 10px;
  padding: 9px 12px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}
.rp-bk-t { font-weight: 700; color: var(--ink); }
.rp-bk-a { font-size: 12px; color: var(--ink-faint); }

.rp-fb {
  padding: 12px 14px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold-light);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
}
.rp-fb-h { color: var(--gold); font-size: 14px; margin-bottom: 4px; letter-spacing: 1px; }
.rp-fb-c { color: var(--ink-soft); font-size: 14px; line-height: 1.7; }

.rp-foot {
  margin-top: 24px; padding-top: 16px;
  border-top: 1px solid var(--line);
  text-align: center;
  font-family: "Noto Serif SC", serif;
  font-size: 13px; color: var(--ink-faint); letter-spacing: 2px;
}

.rp-acts { background: transparent; border: none; box-shadow: none; padding-left: 0; }

@media (max-width: 640px) {
  .report-grid { grid-template-columns: repeat(auto-fill, minmax(104px, 1fr)); gap: 10px; }
  .report-card { padding: 18px 16px 16px; }
  .rp-stats { grid-template-columns: repeat(2, 1fr); }
  .rp-h-nm { font-size: 19px; }
}

/* 下阶段预告：用黛青区别于已读内容的暖色，视觉上表示"未来" */
.rp-next {
  padding: 13px 15px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 3px solid var(--dai-light);
  border-radius: var(--radius-sm);
}
.rp-next-bk {
  font-family: "Noto Serif SC", serif;
  font-size: 15px; font-weight: 700;
  color: var(--dai);
  margin-bottom: 5px;
}
.rp-next-bk span {
  font-family: "Noto Sans SC", sans-serif;
  font-size: 12px; font-weight: 400;
  color: var(--ink-faint);
  margin-left: 8px;
}
.rp-next-hw { font-size: 13px; color: var(--ink-soft); line-height: 1.7; }

/* ===== 批量报告 ===== */
.rp-batch { margin: 14px 0 18px; }
.rp-batch-head {
  display: flex; align-items: baseline; justify-content: space-between;
  padding: 0 2px 10px;
  border-bottom: 1px solid var(--line2);
  margin-bottom: 12px;
}
.rp-batch-t {
  font-family: "Noto Serif SC", serif;
  font-size: 16px; font-weight: 700; color: var(--ink);
}
.rp-batch-n { font-size: 12px; color: var(--ink-faint); letter-spacing: 1px; }

.rp-batch-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  overflow: hidden;
}
.rp-bi-head {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 14px;
  cursor: pointer;
  transition: background .15s ease;
}
.rp-bi-head:hover { background: var(--paper); }
.rp-bi-head.open { background: var(--paper); border-bottom: 1px solid var(--line); }
.rp-bi-nm {
  font-family: "Noto Serif SC", serif;
  font-size: 15px; font-weight: 700; color: var(--ink);
  flex: none; min-width: 56px;
}
.rp-bi-meta {
  flex: 1; font-size: 12px; color: var(--ink-faint);
  font-style: normal;
}
.rp-bi-meta em { font-style: normal; }
.rp-bi-meta em.warn { color: var(--cinnabar); font-weight: 700; }
.rp-bi-ar {
  flex: none; color: var(--ink-faint); font-size: 12px;
  transition: transform .2s ease;
}
.rp-bi-head.open .rp-bi-ar { transform: rotate(180deg); }

.rp-bi-body { padding: 14px; }
.rp-bi-tx {
  margin: 0 0 10px;
  padding: 14px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  font-family: "Noto Sans SC", sans-serif;
  font-size: 13px; line-height: 1.85;
  color: var(--ink-soft);
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 340px;
  overflow-y: auto;
}

@media (max-width: 640px) {
  .rp-bi-head { padding: 11px 12px; gap: 8px; }
  .rp-bi-nm { min-width: 46px; font-size: 14px; }
  .rp-bi-meta { font-size: 11px; }
  .rp-bi-tx { max-height: 260px; font-size: 12px; padding: 11px; }
}