/* ==========================================================================
   Youther · 学习中心（工具卡 + 工作区）
   —— 只依赖主题变量，15 款主题 / 深浅色都自动跟随
   —— 对应的 JS：static/js/views/learn.js
   ========================================================================== */

.learn-page { display: grid; gap: var(--gap); }

/* ---------- 顶部说明条 ---------- */
.learn-hero {
  display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap;
  background:
    radial-gradient(130% 150% at 0% 0%, var(--primary-soft), transparent 60%),
    var(--surface);
}
.learn-hero-main { min-width: 240px; flex: 1 1 340px; }
.learn-hero h2 { margin: 0 0 6px; font-size: 21px; }
.learn-hero p { margin: 0; max-width: 62ch; }
.learn-hero-badges { display: flex; gap: 8px; flex-wrap: wrap; }
.learn-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 12px; border-radius: 999px;
  background: var(--surface); color: var(--text-dim);
  border: 1px solid var(--border); font-size: 12px; white-space: nowrap;
}

/* ---------- 四个工具卡（放到一起） ---------- */
.learn-tools {
  display: grid; gap: 12px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.learn-tool {
  position: relative;
  display: flex; flex-direction: column; align-items: flex-start; gap: 8px;
  width: 100%; padding: 15px 16px 16px;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); color: var(--text);
  font-family: var(--font); font-size: 14px; text-align: left;
  cursor: pointer; overflow: hidden;
  transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease, background .16s ease;
}
.learn-tool::after {
  content: ""; position: absolute; inset: auto 0 0 0; height: 3px;
  background: var(--tool, var(--primary)); opacity: 0; transition: opacity .16s ease;
}
.learn-tool:hover { transform: translateY(-2px); border-color: var(--tool, var(--primary)); box-shadow: var(--shadow); }
.learn-tool.on {
  border-color: var(--tool, var(--primary));
  background: var(--tool-soft, var(--primary-soft));
  box-shadow: var(--shadow-sm);
}
.learn-tool.on::after { opacity: 1; }
.learn-tool-icon {
  width: 46px; height: 46px; border-radius: 15px;
  display: grid; place-items: center; font-size: 23px; line-height: 1;
  background: var(--tool-soft, var(--primary-soft));
  box-shadow: inset 0 0 0 1px var(--tool-line, transparent);
}
.learn-tool-name { font-weight: 700; font-size: 15px; }
.learn-tool-hint { font-size: 12.5px; line-height: 1.55; color: var(--text-dim); }
.learn-tool-flag {
  position: absolute; top: 12px; right: 12px;
  padding: 2px 9px; border-radius: 999px;
  background: var(--tool, var(--primary)); color: #fff;
  font-size: 11px; font-weight: 700; letter-spacing: .02em;
}

/* 每个工具一套颜色（浅淡底 + 描边，深色主题同样清楚） */
.learn-tool[data-tool="essay"], .learn-work[data-tool="essay"] {
  --tool: #2f7df6; --tool-soft: rgba(47, 125, 246, .13); --tool-line: rgba(47, 125, 246, .30);
}
.learn-tool[data-tool="homework"], .learn-work[data-tool="homework"] {
  --tool: #e0861a; --tool-soft: rgba(224, 134, 26, .14); --tool-line: rgba(224, 134, 26, .32);
}
.learn-tool[data-tool="solve"], .learn-work[data-tool="solve"] {
  --tool: #8b5cf6; --tool-soft: rgba(139, 92, 246, .14); --tool-line: rgba(139, 92, 246, .32);
}
.learn-tool[data-tool="translate"], .learn-work[data-tool="translate"] {
  --tool: #0d9d97; --tool-soft: rgba(13, 157, 151, .14); --tool-line: rgba(13, 157, 151, .32);
}

/* ---------- 工作区 ---------- */
.learn-work { padding: 0; overflow: hidden; }
.learn-work-head {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(90deg, var(--tool-soft, var(--primary-soft)), transparent 72%);
}
.learn-work-icon {
  width: 40px; height: 40px; flex: 0 0 40px; border-radius: 13px;
  display: grid; place-items: center; font-size: 20px; line-height: 1;
  background: var(--tool-soft, var(--primary-soft));
  box-shadow: inset 0 0 0 1px var(--tool-line, transparent);
}
.learn-work-head-text { min-width: 0; }
.learn-work-title { font-weight: 700; font-size: 16px; }
.learn-work-tip { font-size: 12.5px; color: var(--text-dim); }
.learn-work-body { padding: 16px 18px 18px; }

/* ---------- 输入区 ---------- */
.learn-input-head {
  display: flex; align-items: center; gap: 10px; margin-bottom: 8px;
}
.learn-step-label {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 12.5px; font-weight: 700; color: var(--text-dim);
}
.learn-step-label .n {
  width: 18px; height: 18px; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--primary-soft); color: var(--primary-strong);
  font-size: 11px;
}
.learn-counter { font-size: 12px; color: var(--text-faint); }
.learn-input .textarea { min-height: 200px; }
.learn-input .textarea::placeholder { color: var(--text-faint); }

/* ---------- 窄屏 ---------- */
@media (max-width: 900px) {
  .learn-tools { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 560px) {
  .learn-hero { padding: 16px 16px; }
  .learn-hero h2 { font-size: 19px; }
  .learn-hero-badges { display: none; }
  .learn-tool { padding: 12px 13px 13px; gap: 6px; }
  .learn-tool-icon { width: 40px; height: 40px; border-radius: 13px; font-size: 20px; }
  .learn-tool-hint { font-size: 12px; }
  .learn-work-head { padding: 12px 14px; }
  .learn-work-head .learn-badge { display: none; }
  .learn-work-body { padding: 13px; }
  .learn-input .textarea { min-height: 160px; }
}

/* ==========================================================================
   学习板块 v2：列表页（数据条 + 2x2 功能大卡 + 今日任务）+ 工具独立页
   ========================================================================== */

.learn-sec {
  font-size: 13px; font-weight: 800; color: var(--text); margin: 6px 2px 9px;
}

/* ---------- 数据条 ---------- */
.learn-stats {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px;
}
.learn-stat {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 12px 13px;
  box-shadow: var(--shadow-sm);
}
.learn-stat .n {
  font-size: 20px; font-weight: 800; color: var(--primary);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.learn-stat .l { font-size: 11px; color: var(--text-dim); margin-top: 2px; }

/* ---------- 2x2 功能大卡 ---------- */
.learn-func-grid {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 13px;
}
.learn-func {
  position: relative; overflow: hidden;
  border-radius: 18px; padding: 18px 17px;
  min-height: 118px;
  display: flex; flex-direction: column; justify-content: flex-end;
  color: #fff; text-decoration: none;
  box-shadow: 0 8px 22px -12px rgba(10, 60, 40, .35);
  transition: transform .16s ease, box-shadow .16s ease;
}
.learn-func:hover { transform: translateY(-2px); box-shadow: 0 14px 28px -12px rgba(10, 60, 40, .45); }
.learn-func::after {
  content: ""; position: absolute; right: -22px; top: -22px;
  width: 84px; height: 84px; border-radius: 50%;
  background: rgba(255, 255, 255, .14);
}
.learn-func .ic { font-size: 26px; line-height: 1; margin-bottom: auto; }
.learn-func .t { font-size: 15.5px; font-weight: 800; margin-top: 8px; }
.learn-func .d { font-size: 11px; opacity: .88; margin-top: 3px; line-height: 1.5; }
.learn-func.lf-g { background: linear-gradient(135deg, #0b6b4f, #16a37b); }
.learn-func.lf-b { background: linear-gradient(135deg, #1565a8, #3f8fd8); }
.learn-func.lf-p { background: linear-gradient(135deg, #8a3fb0, #b76ae0); }
.learn-func.lf-y { background: linear-gradient(135deg, #a3760a, #d99a2b); }
.learn-func.lf-t { background: linear-gradient(135deg, #0b6f85, #1a9fb5); }
.learn-func.lf-w { background: linear-gradient(135deg, #334f91, #5276c9); }
.learn-func.lf-d { background: linear-gradient(135deg, #a8432d, #e06a48); }
.learn-func.lf-n { background: linear-gradient(135deg, #235a68, #3d8c9e); }
.learn-func.lf-k { background: linear-gradient(135deg, #39465d, #6c7b95); }

/* ---------- 学习首页 Hero：把工具、工坊、笔记本放到同一个学习台 ---------- */
.learn-home-hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(230px, .65fr);
  gap: 22px;
  overflow: hidden;
  border: 0;
  color: var(--primary-ink, #fff);
  background:
    radial-gradient(circle at 90% 0%, rgba(255,255,255,.22), transparent 26%),
    radial-gradient(circle at 0% 100%, rgba(255,255,255,.12), transparent 30%),
    linear-gradient(135deg, var(--primary), var(--accent, var(--primary-strong, var(--primary))));
  box-shadow: 0 18px 44px -28px var(--primary);
}
.learn-home-hero::after {
  content: ""; position: absolute; right: -48px; bottom: -82px;
  width: 210px; height: 210px; border: 28px solid rgba(255,255,255,.10);
  border-radius: 50%; pointer-events: none;
}
.learn-home-hero .learn-hero-main { position: relative; z-index: 1; }
.learn-kicker {
  display: inline-flex; padding: 4px 9px; border-radius: 999px;
  background: rgba(255,255,255,.15); font-size: 10px; font-weight: 800;
  letter-spacing: .12em;
}
.learn-home-hero h2 { margin: 10px 0 7px; font-size: clamp(25px, 3vw, 36px); line-height: 1.12; }
.learn-home-hero p { max-width: 56ch; color: rgba(255,255,255,.88); font-size: 13.5px; line-height: 1.7; }
.learn-home-hero .learn-hero-badges { margin-top: 15px; }
.learn-home-hero .learn-badge {
  border-color: rgba(255,255,255,.25); background: rgba(255,255,255,.12); color: #fff;
}
.learn-hero-shortcuts { position: relative; z-index: 1; display: grid; align-content: center; gap: 8px; }
.learn-shortcut {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 12px; border: 1px solid rgba(255,255,255,.22);
  border-radius: 13px; color: #fff; background: rgba(255,255,255,.10);
  text-decoration: none; font-size: 12.5px; font-weight: 700;
  transition: background .16s ease, transform .16s ease;
}
.learn-shortcut:hover { background: rgba(255,255,255,.20); transform: translateX(2px); text-decoration: none; }
.learn-shortcut .ic { font-size: 18px; }
.learn-shortcut .arrow { margin-left: auto; opacity: .65; }

/* ---------- 今日任务 ---------- */
.learn-tasks { display: grid; gap: 9px; }
.learn-task {
  display: flex; align-items: center; gap: 12px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 12px 14px;
  text-decoration: none; color: inherit; cursor: pointer;
  transition: border-color .16s ease;
}
.learn-task:hover { border-color: var(--primary); }
.learn-task .n { font-size: 13px; font-weight: 700; flex: 0 0 84px; }
.learn-task .bar {
  flex: 1; height: 8px; border-radius: 99px;
  background: var(--border); overflow: hidden;
}
.learn-task .bar i {
  display: block; height: 100%; border-radius: 99px;
  background: linear-gradient(90deg, var(--primary), var(--primary-strong));
}
.learn-task .v { font-size: 11px; color: var(--text-dim); font-weight: 700; }

/* ---------- 更多工具 ---------- */
.learn-more {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  margin-top: 4px; padding: 12px 15px;
  background: var(--surface); border: 1px dashed var(--border);
  border-radius: var(--radius); color: var(--text);
  text-decoration: none; font-size: 13px; font-weight: 700;
  transition: border-color .16s ease, color .16s ease;
}
.learn-more:hover { border-color: var(--primary); color: var(--primary); }
.learn-more .arrow { color: var(--text-dim); }

/* ---------- 统一学习工坊：常用学习 + 专项训练 ---------- */
.learn-toolbox {
  display: grid;
  gap: 18px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 5px);
  background:
    radial-gradient(120% 110% at 100% 0%, var(--primary-soft), transparent 46%),
    var(--surface);
  box-shadow: var(--shadow-sm);
}
.learn-tool-group { display: grid; gap: 10px; }
.learn-group-head {
  display: flex; align-items: baseline; gap: 9px; flex-wrap: wrap;
  padding: 0 2px;
}
.learn-group-title { font-size: 14px; font-weight: 800; color: var(--text); }
.learn-group-hint { font-size: 11.5px; font-weight: 500; color: var(--text-dim); }
.learn-func-grid-core { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.learn-func-grid-training { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* ---------- 返回按钮 ---------- */
.learn-back {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13px; font-weight: 700; color: var(--primary);
  text-decoration: none; padding: 4px 0; width: fit-content;
}
.learn-back:hover { opacity: .8; }

/* ---------- 建设中占位 ---------- */
.learn-coming { text-align: center; padding: 40px 16px; }
.learn-coming .ic { font-size: 44px; line-height: 1; }
.learn-coming .t { font-size: 17px; font-weight: 800; margin-top: 10px; }
.learn-coming .d { font-size: 12.5px; color: var(--text-dim); margin-top: 6px; line-height: 1.6; }

@media (max-width: 560px) {
  .learn-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
  .learn-stat .n { font-size: 17px; }
  .learn-func-grid { gap: 9px; }
  .learn-func { min-height: 104px; padding: 14px 14px; border-radius: 15px; }
  .learn-func .t { font-size: 14px; }
  .learn-task .n { flex: 0 0 72px; }
  .learn-home-hero { grid-template-columns: 1fr; padding: 20px 17px; }
  .learn-home-hero h2 { font-size: 27px; }
  .learn-hero-shortcuts { grid-template-columns: 1fr; }
}

@media (min-width: 561px) and (max-width: 960px) {
  .learn-func-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .learn-home-hero { grid-template-columns: 1fr; }
}

@media (max-width: 980px) {
  .learn-func-grid-core,
  .learn-func-grid-training { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  .learn-toolbox { gap: 15px; padding: 12px; border-radius: var(--radius); }
  .learn-group-hint { display: none; }
  .learn-func-grid-core,
  .learn-func-grid-training { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ---------- 学习记录：批改 / 翻译回看 ---------- */
.learn-record-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap);
}
.learn-record-card { padding: 14px 16px 15px; }
.learn-record-card .card-head { margin-bottom: 9px; }
.learn-record-list { display: grid; gap: 7px; }
.learn-record-row {
  display: flex; align-items: center; gap: 10px;
  min-width: 0; padding: 9px 10px;
  border: 1px solid var(--border); border-radius: 12px;
  background: var(--surface); cursor: pointer;
  transition: border-color .16s ease, background .16s ease, transform .16s ease;
}
.learn-record-row:hover {
  border-color: var(--primary); background: var(--bg-soft);
  transform: translateY(-1px);
}
.learn-record-icon {
  width: 32px; height: 32px; flex: 0 0 32px; border-radius: 10px;
  display: grid; place-items: center; font-size: 16px;
  background: var(--primary-soft);
}
.learn-record-main { min-width: 0; flex: 1; }
.learn-record-top { display: flex; align-items: center; gap: 6px; min-width: 0; }
.learn-record-title {
  min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  font-size: 13px; font-weight: 700; color: var(--text);
}
.learn-record-time {
  margin-left: auto; flex: 0 0 auto;
  font-size: 11px; color: var(--text-faint); white-space: nowrap;
}
.learn-record-sub {
  margin-top: 3px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  font-size: 12px; line-height: 1.5; color: var(--text-dim);
}
.learn-record-del { flex: 0 0 auto; }
.learn-record-empty {
  display: grid; gap: 4px; padding: 16px 12px;
  border: 1px dashed var(--border); border-radius: 12px;
  color: var(--text-dim); font-size: 13px; text-align: center;
}
.learn-original,
.learn-translation {
  white-space: pre-wrap; overflow-wrap: anywhere;
  font-size: 14.5px; line-height: 1.75; color: var(--text);
}
.learn-original { color: var(--text-dim); }
.learn-translation { color: var(--text); font-weight: 600; }

@media (max-width: 860px) {
  .learn-record-grid { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .learn-record-card { padding: 12px 12px 13px; }
  .learn-record-icon { width: 28px; height: 28px; flex-basis: 28px; font-size: 14px; }
  .learn-record-title { font-size: 12.5px; }
  .learn-record-sub { font-size: 11.5px; }
}