/* ============================================================
   KidsLab — 知识糖果实验室
   Sticker-craft candy lab · light paper / midnight lab themes
   ============================================================ */

@font-face {
  font-family: "Baloo 2";
  src: url("../fonts/baloo2-latin.woff2") format("woff2");
  font-weight: 400 800;
  font-style: normal;
  font-display: swap;
}

/* ---------- design tokens ---------- */
:root {
  --font-display: "Baloo 2", ui-rounded, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-body: -apple-system, "Baloo 2", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;

  /* 学科签名色 category signatures */
  --c-featured: #ff9f1c;
  --c-recent: #7c6af2;
  --c-newest: #ff6b9d;
  --c-math: #ef476f;
  --c-physics: #118ab2;
  --c-chemistry: #9b5de5;
  --c-programming: #06d6a0;
  --c-science: #f8961e;
  --c-logic: #ffd166;

  --radius-lg: 22px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --sidebar-w: 264px;
  --sidebar-rail: 84px;
  --speed: 0.22s;
}

/* accent presets 颜色风格 */
:root[data-accent="candy"]     { --accent:#ff5d8f; --accent-2:#ffd166; --accent-deep:#e63946; }
:root[data-accent="ocean"]     { --accent:#2f9df4; --accent-2:#4cc9f0; --accent-deep:#1d6fd1; }
:root[data-accent="forest"]    { --accent:#2fbf71; --accent-2:#a3de52; --accent-deep:#149055; }
:root[data-accent="tangerine"] { --accent:#ff8a00; --accent-2:#ffc53d; --accent-deep:#e5570b; }

:root[data-theme="light"] {
  color-scheme: light;
  --paper: #fbf6ec;
  --paper-2: #f4ecdc;
  --card: #fffdf7;
  --ink: #2b2440;
  --ink-soft: #6f6885;
  --ink-faint: #a49cb8;
  --line: #e5dccb;
  --line-strong: #2b2440;
  --shadow: rgba(43, 36, 64, 0.92);
  --dot: rgba(43, 36, 64, 0.07);
  --blob-op: 0.5;
  --seg-bg: #efe6d3;
  --hover-bg: rgba(43, 36, 64, 0.05);
  --search-bg: #fffdf7;
  --kbd-bg: #f0e8d8;
  --cover-emoji-bg: rgba(255, 255, 255, 0.34);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --paper: #16132a;
  --paper-2: #1d1936;
  --card: #221d40;
  --ink: #f3efff;
  --ink-soft: #a9a1c6;
  --ink-faint: #6f6790;
  --line: #35305a;
  --line-strong: #0b0918;
  --shadow: rgba(5, 4, 14, 0.9);
  --dot: rgba(243, 239, 255, 0.055);
  --blob-op: 0.34;
  --seg-bg: #191537;
  --hover-bg: rgba(243, 239, 255, 0.06);
  --search-bg: #221d40;
  --kbd-bg: #191537;
  --cover-emoji-bg: rgba(10, 8, 24, 0.26);
}

/* ---------- base ---------- */
* { box-sizing: border-box; }
/* 触控延时优化：取消双击缩放的手势仲裁等待，点按即时响应（PWA/平板） */
html { height: 100%; touch-action: manipulation; -webkit-tap-highlight-color: transparent; }
body {
  margin: 0;
  min-height: 100%;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  background-image: radial-gradient(var(--dot) 1.5px, transparent 1.5px);
  background-size: 24px 24px;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--speed), color var(--speed);
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: var(--blob-op);
  background:
    radial-gradient(560px 400px at 88% -6%, color-mix(in srgb, var(--accent) 26%, transparent), transparent 68%),
    radial-gradient(480px 380px at -6% 38%, color-mix(in srgb, var(--accent-2) 24%, transparent), transparent 66%),
    radial-gradient(520px 420px at 62% 108%, color-mix(in srgb, var(--c-chemistry) 16%, transparent), transparent 70%);
  transition: opacity var(--speed);
}
::selection { background: color-mix(in srgb, var(--accent) 30%, transparent); }
a { color: inherit; }
button { font-family: inherit; color: inherit; }

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 6px;
}

/* ---------- layout ---------- */
.app {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  min-height: 100vh;
  transition: grid-template-columns var(--speed) ease;
}
.app.is-collapsed { grid-template-columns: var(--sidebar-rail) minmax(0, 1fr); }

/* ============ SIDEBAR ============ */
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 14px;
  background: color-mix(in srgb, var(--paper-2) 82%, transparent);
  backdrop-filter: blur(10px);
  border-right: 2px solid var(--line);
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
}

.sidebar__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  margin-bottom: 14px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  min-width: 0;
}
.brand__mark {
  flex: none;
  border-radius: 12px;
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.brand:hover .brand__mark { transform: rotate(-8deg) scale(1.06); }
.brand__text { display: flex; flex-direction: column; line-height: 1.05; white-space: nowrap; }
.brand__text b {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 21px;
  letter-spacing: 0.5px;
}
.brand__text small {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 11.5px;
  letter-spacing: 2.2px;
  text-transform: uppercase;
  color: var(--accent);
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  flex: none;
  border: 2px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--card);
  cursor: pointer;
  transition: transform 0.15s, border-color 0.15s, background var(--speed);
}
.icon-btn:hover { border-color: var(--accent); transform: translateY(-1px); }
.icon-btn:active { transform: translateY(1px); }

.sidebar__collapse svg { transition: transform 0.3s; }
.is-collapsed .sidebar__collapse svg { transform: rotate(180deg); }

.sidebar__body { display: flex; flex-direction: column; gap: 20px; flex: 1; }

.side-sec__label {
  margin: 0 0 9px 4px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 2.6px;
  text-transform: uppercase;
  color: var(--ink-faint);
  white-space: nowrap;
}

/* 学段 segmented */
.level-seg {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
  padding: 4px;
  background: var(--seg-bg);
  border: 2px solid var(--line);
  border-radius: var(--radius-md);
}
.level-seg button {
  appearance: none;
  border: 2px solid transparent;
  background: transparent;
  border-radius: 9px;
  padding: 7px 2px;
  font-size: 13.5px;
  font-weight: 700;
  color: var(--ink-soft);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.18s;
}
.level-seg button:hover { color: var(--ink); background: var(--hover-bg); }
.level-seg button[aria-checked="true"] {
  background: var(--accent);
  border-color: var(--line-strong);
  color: #fff;
  box-shadow: 2px 2px 0 var(--shadow);
  transform: translateY(-1px);
}

/* 年级过滤 grades */
.grade-filter {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 5px 2px 0;
  padding: 8px 10px;
  border: 2px solid var(--line);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--card) 66%, transparent);
}
.grade-filter[hidden] { display: none; }
.grade-filter__label {
  flex: none;
  margin: 0;
  padding: 0 2px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 2.2px;
  text-transform: uppercase;
  color: var(--ink-faint);
  white-space: nowrap;
}
.grade-list {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.grade-list button {
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  min-height: 31px;
  padding: 5px 7px 5px 10px;
  border: 2px solid var(--line);
  border-radius: 99px;
  background: color-mix(in srgb, var(--card) 54%, transparent);
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
  transition: transform 0.16s, border-color 0.16s, background var(--speed), color var(--speed);
}
.grade-list button:hover { color: var(--ink); border-color: var(--accent); transform: translateY(-1px); }
.grade-list button[aria-checked="true"] {
  background: var(--card);
  border-color: var(--line-strong);
  color: var(--ink);
  box-shadow: 2px 2px 0 var(--shadow);
}
.grade__name {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.grade__count {
  flex: none;
  display: grid;
  place-items: center;
  min-width: 22px;
  height: 20px;
  padding: 0 6px;
  border-radius: 99px;
  background: var(--seg-bg);
  color: var(--ink-soft);
  font-family: var(--font-display);
  font-size: 11px;
}
.grade-list button[aria-checked="true"] .grade__count { background: var(--accent); color: #fff; }

/* 分类 categories */
.cat-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 5px; }
.cat-list button {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  background: transparent;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--ink-soft);
  cursor: pointer;
  transition: all 0.16s;
  white-space: nowrap;
}
.cat-list button:hover { background: var(--hover-bg); color: var(--ink); transform: translateX(2px); }
.cat-list button.is-active {
  background: var(--card);
  border-color: var(--line-strong);
  color: var(--ink);
  box-shadow: 3px 3px 0 var(--shadow);
}
.cat-list .cat__dot {
  flex: none;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  font-size: 16px;
  border-radius: 9px;
  background: color-mix(in srgb, var(--cat-c, var(--accent)) 18%, transparent);
  border: 1.5px solid color-mix(in srgb, var(--cat-c, var(--accent)) 55%, transparent);
}
.cat-list .cat__name { flex: 1; text-align: left; overflow: hidden; text-overflow: ellipsis; }
.cat-list .cat__count {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  padding: 1px 8px;
  border-radius: 99px;
  background: var(--seg-bg);
  color: var(--ink-soft);
  border: 1.5px solid var(--line);
}
.cat-list button.is-active .cat__count { background: var(--cat-c, var(--accent)); color: #fff; border-color: transparent; }
/* 特殊分类：最近探索 / 最新创建，与学科列表轻微分隔 */
.cat-list__special + li:not(.cat-list__special) {
  margin-top: 6px;
  padding-top: 8px;
  border-top: 1.5px dashed var(--line);
}

.sidebar__foot { margin-top: 14px; display: flex; flex-direction: column; gap: 10px; }
.accent-row { display: flex; gap: 8px; padding: 0 4px; }
.accent-row button {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid var(--line-strong);
  background: var(--sw, #999);
  cursor: pointer;
  transition: transform 0.15s;
}
.accent-row button:hover { transform: scale(1.18) rotate(10deg); }
.accent-row button.is-active { box-shadow: 0 0 0 3px var(--paper), 0 0 0 5.5px var(--sw); }
.progress-clear {
  width: 100%;
  padding: 7px 9px;
  border: 1.5px solid var(--line);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--ink-faint);
  font: inherit;
  font-size: 11.5px;
  font-weight: 700;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.progress-clear:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--seg-bg);
}
.progress-clear[hidden] { display: none; }
.sidebar__ver { margin: 0; padding: 0 4px; font-size: 11.5px; color: var(--ink-faint); white-space: nowrap; }

/* --- collapsed rail --- */
.is-collapsed .sidebar { padding: 18px 10px; }
.is-collapsed .brand__text,
.is-collapsed .side-sec__label,
.is-collapsed .cat__name,
.is-collapsed .cat__count,
.is-collapsed .sidebar__ver,
.is-collapsed .accent-row,
.is-collapsed .progress-clear { display: none; }
.is-collapsed .sidebar__head { flex-direction: column; gap: 10px; }
.is-collapsed .brand__mark { width: 38px; height: 38px; }
.is-collapsed .level-seg { grid-template-columns: 1fr; }
.is-collapsed .cat-list button { justify-content: center; padding: 8px 4px; }
.is-collapsed .sidebar__foot { align-items: center; }

/* ============ MAIN ============ */
.main {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 18px clamp(16px, 3.5vw, 42px) 30px;
  gap: 8px;
}

.topbar {
  position: sticky;
  top: 12px;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: color-mix(in srgb, var(--card) 88%, transparent);
  backdrop-filter: blur(12px);
  border: 2px solid var(--line-strong);
  border-radius: var(--radius-lg);
  box-shadow: 4px 5px 0 var(--shadow);
}
.topbar__menu { display: none; }
.topbar__actions { display: flex; gap: 8px; }

.search {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 9px;
  min-width: 0;
  padding: 8px 13px;
  border: 2px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--search-bg);
  color: var(--ink-soft);
  cursor: text;
  transition: border-color 0.18s, box-shadow 0.18s;
}
.search:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 18%, transparent);
}
.search input {
  flex: 1;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  font: inherit;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ink);
}
.search input::placeholder { color: var(--ink-faint); font-weight: 500; }
.search input::-webkit-search-cancel-button { -webkit-appearance: none; }
.search kbd {
  font-family: var(--font-display);
  font-size: 11.5px;
  font-weight: 700;
  padding: 1px 8px;
  border-radius: 7px;
  border: 1.5px solid var(--line);
  border-bottom-width: 3px;
  background: var(--kbd-bg);
  color: var(--ink-faint);
}

.lang-btn { width: auto; padding: 0 11px; font-family: var(--font-display); font-weight: 800; font-size: 13px; letter-spacing: 1px; }
.ico-moon { display: none; }
:root[data-theme="dark"] .ico-moon { display: block; }
:root[data-theme="dark"] .ico-sun { display: none; }

/* hero */
.hero { padding: 22px 6px 4px; }
.hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 3.4vw, 38px);
  letter-spacing: 0.3px;
  line-height: 1.15;
}
.hero__wave { display: inline-block; animation: wave 2.4s ease-in-out infinite; transform-origin: 72% 78%; }
@keyframes wave {
  0%, 55%, 100% { transform: rotate(0deg); }
  10% { transform: rotate(16deg); } 20% { transform: rotate(-7deg); }
  30% { transform: rotate(14deg); } 42% { transform: rotate(-4deg); }
}
.hero__sub { margin: 7px 0 0 2px; font-size: 14px; font-weight: 600; color: var(--ink-soft); }
.hero__sub b { color: var(--accent-deep, var(--accent)); }

/* ============ GRID / CARDS ============ */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(248px, 1fr));
  gap: 22px;
  padding: 18px 2px 10px;
}

.card {
  --cat-c: var(--accent);
  position: relative;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  background: var(--card);
  border: 2.5px solid var(--line-strong);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 5px 6px 0 var(--shadow);
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.2s;
  animation: pop-in 0.5s cubic-bezier(0.34, 1.4, 0.64, 1) both;
  animation-delay: calc(var(--i, 0) * 55ms);
}
@keyframes pop-in {
  from { opacity: 0; transform: translateY(22px) scale(0.96); }
  to { opacity: 1; transform: none; }
}
.card:hover {
  transform: translate(-2px, -5px) rotate(-0.5deg);
  box-shadow: 9px 11px 0 var(--shadow);
}
.card:active { transform: translate(1px, 1px); box-shadow: 3px 3px 0 var(--shadow); }

.card__cover {
  position: relative;
  height: 128px;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at 18px 18px, rgba(255, 255, 255, 0.28) 2.5px, transparent 3px),
    linear-gradient(135deg, color-mix(in srgb, var(--cat-c) 88%, #fff) 0%, var(--cat-c) 55%, color-mix(in srgb, var(--cat-c) 72%, #1a1430) 100%);
  background-size: 34px 34px, 100% 100%;
  border-bottom: 2.5px solid var(--line-strong);
}
.card__emoji {
  display: grid;
  place-items: center;
  width: 74px;
  height: 74px;
  font-size: 42px;
  background: var(--cover-emoji-bg);
  border: 2px solid rgba(255, 255, 255, 0.55);
  border-radius: 22px;
  backdrop-filter: blur(3px);
  box-shadow: 0 8px 22px rgba(10, 6, 30, 0.25);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.card:hover .card__emoji { transform: scale(1.12) rotate(6deg); }

.card__pin {
  position: absolute;
  top: 10px;
  left: 10px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11.5px;
  font-weight: 800;
  padding: 3px 10px 3px 8px;
  color: #4a3200;
  background: linear-gradient(160deg, #ffe29a, #ffc53d);
  border: 2px solid var(--line-strong);
  border-radius: 99px;
  box-shadow: 2px 2px 0 var(--shadow);
}
.card__new { position: absolute; top: 10px; right: 10px; font-size: 17px; filter: drop-shadow(1px 2px 0 rgba(0,0,0,0.3)); }
.card__progress {
  position: absolute;
  right: 10px;
  bottom: 10px;
  padding: 4px 10px;
  font-size: 11.5px;
  font-weight: 800;
  color: #263323;
  border: 2px solid var(--line-strong);
  border-radius: 99px;
  box-shadow: 2px 2px 0 var(--shadow);
}
.card__progress--played { background: #ffe29a; }
.card__progress--completed { background: #8be3b2; }
.card__offline {
  position: absolute;
  left: 10px;
  bottom: 10px;
  padding: 4px 10px;
  font-size: 11.5px;
  font-weight: 800;
  color: #0d3b4f;
  background: #aee3f5;
  border: 2px solid var(--line-strong);
  border-radius: 99px;
  box-shadow: 2px 2px 0 var(--shadow);
}

.card__body { padding: 14px 16px 6px; }
.card__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 18.5px;
  font-weight: 800;
  letter-spacing: 0.2px;
  line-height: 1.25;
}
.card__desc {
  margin: 6px 0 0;
  font-size: 13.2px;
  line-height: 1.62;
  color: var(--ink-soft);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 2.9em;
}

.card__meta {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 16px 15px;
  margin-top: auto;
}
.chip {
  font-size: 11.5px;
  font-weight: 800;
  padding: 3px 10px;
  border-radius: 99px;
  border: 1.8px solid var(--line-strong);
}
.chip--cat { background: var(--cat-c); color: #fff; box-shadow: 1.5px 1.5px 0 var(--shadow); }
:root[data-theme="light"] .chip--logic-fix { color: #4a3200; }
.card__levels { display: flex; gap: 4px; margin-left: auto; }
.lv {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  font-size: 10.5px;
  font-weight: 800;
  border-radius: 8px;
  color: var(--ink-soft);
  background: var(--seg-bg);
  border: 1.5px solid var(--line);
}

/* empty state */
.empty { text-align: center; padding: 64px 20px; }
.empty__scope { font-size: 58px; animation: floaty 3s ease-in-out infinite; }
@keyframes floaty { 50% { transform: translateY(-10px) rotate(-6deg); } }
.empty h3 { font-family: var(--font-display); font-size: 22px; margin: 14px 0 6px; }
.empty p { color: var(--ink-soft); margin: 0 0 22px; }
.btn-reset {
  font: inherit;
  font-weight: 800;
  padding: 10px 26px;
  border: 2.5px solid var(--line-strong);
  border-radius: 99px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  box-shadow: 4px 4px 0 var(--shadow);
  transition: transform 0.15s, box-shadow 0.15s;
}
.btn-reset:hover { transform: translate(-1px, -2px); box-shadow: 6px 6px 0 var(--shadow); }
.btn-reset:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--shadow); }

.foot {
  margin-top: auto;
  padding: 26px 4px 4px;
  display: flex;
  justify-content: space-between;
  gap: 10px;
  font-size: 12.5px;
  color: var(--ink-faint);
}
.foot a { color: var(--ink-soft); font-weight: 700; text-decoration-color: var(--accent); text-underline-offset: 3px; }
.foot a:hover { color: var(--accent); }

/* ============ 响应式 ============ */
.backdrop {
  position: fixed;
  inset: 0;
  z-index: 40;
  background: rgba(12, 8, 28, 0.5);
  backdrop-filter: blur(2px);
}

@media (max-width: 860px) {
  .app, .app.is-collapsed { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    z-index: 50;
    left: 0;
    top: 0;
    bottom: 0;
    width: min(300px, 84vw);
    transform: translateX(-104%);
    transition: transform 0.28s cubic-bezier(0.2, 0.9, 0.3, 1);
    border-right-width: 2.5px;
    box-shadow: 10px 0 40px rgba(10, 6, 30, 0.25);
    background: var(--paper-2);
  }
  .app.menu-open .sidebar { transform: none; }
  /* 移动端不使用收拢态 */
  .is-collapsed .brand__text, .is-collapsed .side-sec__label, .is-collapsed .cat__name,
  .is-collapsed .cat__count, .is-collapsed .sidebar__ver, .is-collapsed .accent-row { display: revert; }
  .is-collapsed .progress-clear:not([hidden]) { display: block; }
  .is-collapsed .level-seg { grid-template-columns: repeat(3, 1fr); }
  .is-collapsed .cat-list button { justify-content: flex-start; padding: 9px 10px; }
  .is-collapsed .sidebar__head { flex-direction: row; }
  .sidebar__collapse { display: none; }
  .topbar__menu { display: inline-flex; }
  .topbar { top: 8px; }
  .search kbd { display: none; }
  .grade-filter { align-items: flex-start; margin-top: 3px; padding: 8px; }
  .grade-filter__label { padding-top: 8px; }
  .grid { grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 16px; }
  .hero { padding-top: 16px; }
}
@media (max-width: 480px) {
  .grade-filter { flex-direction: column; gap: 7px; }
  .grade-filter__label { padding-top: 0; }
  .grade-list { width: 100%; }
  .grade-list button { flex: 1 1 calc(50% - 6px); }
  .grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .card__cover { height: 104px; }
  .card__emoji { width: 60px; height: 60px; font-size: 34px; }
  .card__desc { display: none; }
  .card__title { font-size: 15.5px; }
  .main { padding: 12px 12px 22px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

/* ---------- 星图模式 star map · 儿童天文台控制台 ---------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.starmap-btn { color: var(--ink-soft); }
.starmap-btn:hover { color: var(--accent); }

.starmap {
  --atlas-panel: rgba(12, 15, 39, 0.82);
  --atlas-panel-strong: rgba(10, 12, 31, 0.94);
  --atlas-line: rgba(150, 169, 229, 0.25);
  --atlas-line-hot: #7ce7ff;
  --atlas-copy: #f1f4ff;
  --atlas-muted: #aeb8da;
  position: fixed;
  inset: 0;
  z-index: 60;
  overflow: hidden;
  background:
    linear-gradient(rgba(124, 231, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124, 231, 255, 0.025) 1px, transparent 1px),
    radial-gradient(ellipse 90% 70% at 50% 110%, #292454 0%, transparent 60%),
    radial-gradient(ellipse 70% 55% at 85% -10%, #173565 0%, transparent 55%),
    #080a19;
  background-size: 48px 48px, 48px 48px, auto, auto, auto;
  color: var(--atlas-copy);
}
.starmap::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(115deg, transparent 0 47%, rgba(124, 231, 255, 0.035) 48%, transparent 49% 100%);
  mix-blend-mode: screen;
}
.starmap canvas { position: absolute; inset: 0; cursor: grab; touch-action: none; }
.starmap canvas:active { cursor: grabbing; }

.starmap__bar {
  position: absolute;
  top: 12px;
  left: 14px;
  right: 14px;
  z-index: 3;
  display: grid;
  grid-template-columns: minmax(170px, 0.72fr) minmax(260px, 1.15fr) minmax(410px, 1.7fr) 46px 46px;
  align-items: center;
  gap: 10px;
  min-height: 68px;
  padding: 9px 10px 9px 14px;
  border: 1px solid var(--atlas-line);
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(17, 20, 51, 0.92), rgba(10, 12, 31, 0.72));
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.34), inset 0 1px 0 rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(18px) saturate(1.25);
}
.starmap__identity { min-width: 0; }
.starmap__eyebrow {
  display: block;
  margin-bottom: 1px;
  color: #7ce7ff;
  font: 800 10px/1.1 var(--font-display), sans-serif;
  letter-spacing: 1.8px;
  white-space: nowrap;
}
.starmap__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: 0.5px;
  text-shadow: 0 0 18px rgba(140, 130, 255, 0.55);
}
.starmap__hint {
  margin: 3px 0 0;
  overflow: hidden;
  color: var(--atlas-muted);
  font-size: 12px;
  line-height: 1.2;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.starmap__search {
  display: flex;
  align-items: center;
  gap: 9px;
  min-width: 0;
  min-height: 46px;
  padding: 0 12px;
  border: 1px solid var(--atlas-line);
  border-radius: 13px;
  background: rgba(3, 6, 22, 0.58);
  color: var(--atlas-muted);
  transition: border-color 0.18s, box-shadow 0.18s, background 0.18s;
}
.starmap__search:focus-within {
  border-color: var(--atlas-line-hot);
  background: rgba(7, 12, 34, 0.9);
  box-shadow: 0 0 0 3px rgba(124, 231, 255, 0.12), 0 0 26px rgba(124, 231, 255, 0.12);
}
.starmap__search input {
  min-width: 0;
  flex: 1;
  border: 0;
  outline: 0;
  background: transparent;
  color: #fff;
  font: 700 16px/1.2 var(--font-body);
}
.starmap__search input::placeholder { color: #7f89ae; font-weight: 600; }
.starmap__search input::-webkit-search-cancel-button { display: none; }
.starmap__search kbd {
  min-width: 36px;
  padding: 3px 7px;
  border: 1px solid rgba(174, 184, 218, 0.25);
  border-radius: 7px;
  color: #8e99bf;
  background: rgba(255, 255, 255, 0.04);
  font: 700 11px var(--font-display), sans-serif;
  text-align: center;
}

.starmap__modes {
  display: grid;
  grid-template-columns: repeat(6, minmax(55px, 1fr));
  gap: 5px;
  min-width: 0;
  padding: 4px;
  border: 1px solid var(--atlas-line);
  border-radius: 14px;
  background: rgba(3, 6, 22, 0.52);
}
.starmap__modes button {
  min-width: 0;
  min-height: 44px;
  padding: 4px 5px;
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  color: #8791b8;
  cursor: pointer;
  transition: color 0.16s, border-color 0.16s, background 0.16s, transform 0.16s;
}
.starmap__modes button span { display: block; font-size: 17px; line-height: 1; }
.starmap__modes button b {
  display: block;
  margin-top: 3px;
  overflow: hidden;
  font: 800 11px/1 var(--font-display), sans-serif;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.starmap__modes button:hover {
  color: #f5f7ff;
  border-color: rgba(124, 231, 255, 0.24);
  background: rgba(124, 231, 255, 0.07);
  transform: translateY(-1px);
}
.starmap__modes button[aria-pressed="true"] {
  color: #061522;
  border-color: #bdf4ff;
  background: linear-gradient(135deg, #bdf4ff, #72d9fb);
  box-shadow: 0 0 20px rgba(124, 231, 255, 0.28);
}

.starmap__sound,
.starmap__close {
  width: 46px;
  height: 46px;
  color: var(--atlas-copy);
  background: rgba(15, 19, 49, 0.88);
  border-color: var(--atlas-line);
}
.starmap__sound:hover,
.starmap__close:hover { border-color: var(--atlas-line-hot); }
.starmap__sound span { font-size: 18px; }

.starmap__results {
  position: absolute;
  z-index: 4;
  top: 96px;
  left: clamp(14px, 17.2vw, 252px);
  width: min(390px, calc(100vw - 28px));
  max-height: min(58vh, 520px);
  overflow: hidden;
  border: 1px solid rgba(124, 231, 255, 0.35);
  border-radius: 16px;
  background: var(--atlas-panel-strong);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.48), 0 0 34px rgba(124, 231, 255, 0.08);
  backdrop-filter: blur(20px);
}
.starmap__results-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 48px;
  padding: 8px 10px 8px 15px;
  border-bottom: 1px solid var(--atlas-line);
}
.starmap__results-head strong { font-size: 14px; color: #cbd5f8; }
.starmap__search-clear {
  min-height: 36px;
  padding: 7px 10px;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: #8f9ac0;
  font: 700 14px var(--font-body);
  cursor: pointer;
}
.starmap__search-clear:hover { color: #fff; background: rgba(255, 255, 255, 0.06); }
.starmap__results-list {
  max-height: min(50vh, 456px);
  overflow: auto;
  padding: 7px;
  scrollbar-width: thin;
}
.starmap__result {
  width: 100%;
  min-height: 58px;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid transparent;
  border-radius: 11px;
  background: transparent;
  color: var(--atlas-copy);
  text-align: left;
  cursor: pointer;
}
.starmap__result:hover,
.starmap__result:focus-visible {
  border-color: rgba(124, 231, 255, 0.32);
  background: rgba(124, 231, 255, 0.08);
}
.starmap__result-icon {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: rgba(124, 231, 255, 0.1);
  font-size: 18px;
}
.starmap__result-copy { min-width: 0; }
.starmap__result-copy b,
.starmap__result-copy small {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.starmap__result-copy b { font-size: 15px; }
.starmap__result-copy small { margin-top: 3px; color: #929dc3; font-size: 13px; }
.starmap__result-arrow { color: #7ce7ff; font-size: 18px; }
.starmap__results-empty { margin: 0; padding: 24px 18px; color: #aeb8da; font-size: 15px; text-align: center; }

.starmap__legend {
  position: absolute;
  z-index: 2;
  left: 18px;
  bottom: 18px;
  display: flex;
  max-width: calc(100vw - 390px);
  flex-wrap: wrap;
  gap: 7px 8px;
  color: #cdd6ff;
}
.starmap__lg {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 12px;
  border: 1px solid var(--atlas-line);
  border-radius: 999px;
  background: var(--atlas-panel);
  color: inherit;
  font: 700 14px var(--font-body);
  cursor: pointer;
  opacity: 0.48;
  backdrop-filter: blur(12px);
  transition: opacity 0.15s, border-color 0.15s, transform 0.15s, background 0.15s;
}
.starmap__lg:hover { border-color: #8d96c8; transform: translateY(-1px); }
.starmap__lg.is-on { opacity: 1; border-color: #5d679d; background: rgba(22, 25, 61, 0.9); }
.starmap__lg i { width: 11px; height: 11px; border-radius: 3px; box-shadow: 0 0 8px currentColor; }

.starmap__info {
  position: absolute;
  z-index: 3;
  right: 18px;
  bottom: 18px;
  width: min(350px, calc(100vw - 36px));
  padding: 16px;
  border: 1px solid var(--atlas-line);
  border-radius: 16px;
  background: var(--atlas-panel-strong);
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(16px);
}
.starmap__info b { font-family: var(--font-display); font-size: 17px; }
.starmap__info p { margin: 6px 0 0; font-size: 14px; line-height: 1.5; color: #b0b9d9; }
.starmap__info small { display: block; margin-top: 8px; font-size: 14px; color: #7ce7ff; }
.starmap__info a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  margin-top: 12px;
  padding: 0 14px;
  border: 1px solid #bdf4ff;
  border-radius: 10px;
  background: #7ce7ff;
  color: #07121e;
  font: 800 15px var(--font-body);
  text-decoration: none;
}
.starmap__info a:hover { background: #bdf4ff; transform: translateY(-1px); }
.starmap__status {
  position: absolute;
  z-index: 2;
  top: 98px;
  right: 18px;
  color: #8f9ac0;
  font: 700 13px var(--font-display), sans-serif;
  letter-spacing: 0.4px;
  pointer-events: none;
}

@media (max-width: 1180px) {
  .starmap__bar { grid-template-columns: minmax(150px, 0.65fr) minmax(230px, 1fr) minmax(330px, 1.45fr) 46px 46px; }
  .starmap__identity .starmap__hint { display: none; }
  .starmap__modes button b { font-size: 10px; }
}

@media (max-width: 900px) {
  .starmap__bar {
    grid-template-columns: minmax(0, 1fr) 46px 46px;
    align-items: center;
    padding: 9px;
  }
  .starmap__identity { padding-left: 3px; }
  .starmap__eyebrow { font-size: 9px; letter-spacing: 1.3px; }
  .starmap__title { font-size: 19px; }
  .starmap__search { grid-column: 1 / -1; grid-row: 2; }
  .starmap__search kbd { display: none; }
  .starmap__modes {
    position: static;
    grid-column: 1 / -1;
    grid-row: 3;
    grid-template-columns: repeat(6, minmax(50px, 1fr));
    overflow-x: auto;
    background: rgba(8, 10, 28, 0.94);
    backdrop-filter: blur(18px);
  }
  .starmap__results { top: 190px; left: 14px; max-height: calc(100vh - 262px); }
  .starmap__results-list { max-height: calc(100vh - 318px); }
  .starmap__legend {
    left: 12px;
    right: 12px;
    bottom: 10px;
    max-width: none;
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
  }
  .starmap__legend::-webkit-scrollbar { display: none; }
  .starmap__lg { flex: none; }
  .starmap__info { left: 12px; right: 12px; bottom: 62px; width: auto; }
  .starmap__status { display: none; }
}

@media (max-width: 480px) {
  .starmap__bar { top: 8px; left: 8px; right: 8px; gap: 7px; border-radius: 15px; }
  .starmap__results { top: 184px; left: 8px; width: calc(100vw - 16px); max-height: calc(100vh - 252px); }
  .starmap__results-list { max-height: calc(100vh - 308px); }
  .starmap__modes { gap: 3px; }
  .starmap__modes button { min-width: 51px; padding-inline: 3px; }
  .starmap__modes button b { font-size: 9.5px; }
  .starmap__legend { left: 8px; right: 8px; bottom: 8px; }
  .starmap__info { left: 8px; right: 8px; bottom: 60px; }
}