:root {
  --radius: 14px;
  --maxw: 1400px;
  --font: "Inter", "Noto Sans TC", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang TC", "Microsoft JhengHei", sans-serif;
}

html[data-theme="dark"] {
  --bg: #0c1015;
  --bg-soft: #141a22;
  --panel: #171e27;
  --panel-2: #1e2731;
  --border: #2a3543;
  --text: #e8edf4;
  --text-dim: #93a2b5;
  --accent: #10a37f;
  --accent-soft: rgba(16, 163, 127, 0.16);
  --accent-text: #4fd6b0;
  --warn: #f5c451;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
}

html[data-theme="light"] {
  --bg: #f4f6fa;
  --bg-soft: #eaeef5;
  --panel: #ffffff;
  --panel-2: #f7f9fc;
  --border: #d9e0ea;
  --text: #14202e;
  --text-dim: #5b6b7f;
  --accent: #0e8f6f;
  --accent-soft: rgba(14, 143, 111, 0.12);
  --accent-text: #0b7a5e;
  --warn: #c98a06;
  --shadow: 0 14px 32px rgba(19, 38, 61, 0.12);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

button { font: inherit; cursor: pointer; }

/* ---------- top bar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  padding: 16px clamp(16px, 3vw, 32px) 14px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.topbar-main {
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

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

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 13px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  letter-spacing: 0.5px;
  flex: none;
}

.brand h1 { margin: 0; font-size: 1.12rem; letter-spacing: 0.2px; }
.subtitle { margin: 0; font-size: 0.8rem; color: var(--text-dim); }

.topbar-actions { display: flex; align-items: center; gap: 10px; }

.segmented {
  display: inline-flex;
  padding: 3px;
  gap: 3px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 999px;
}

.segmented button {
  border: 0;
  background: transparent;
  color: var(--text-dim);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.82rem;
  transition: background 0.15s, color 0.15s;
}

.segmented button.is-active { background: var(--accent); color: #fff; }

.icon-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  font-size: 1rem;
}

.searchbar {
  max-width: var(--maxw);
  margin: 12px auto 0;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.search-field {
  flex: 1 1 320px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 14px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 999px;
}

.search-field:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

.search-field input {
  flex: 1;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  padding: 11px 0;
  font-size: 0.92rem;
}

.search-field input::-webkit-search-cancel-button { display: none; }

.clear-btn {
  border: 0;
  background: transparent;
  color: var(--text-dim);
  font-size: 1.2rem;
  line-height: 1;
}

/* ---------- layout ---------- */
.layout {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 24px clamp(16px, 3vw, 32px) 64px;
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.sidebar {
  position: sticky;
  top: 148px;
  max-height: calc(100vh - 170px);
  overflow-y: auto;
}

.cat-nav { display: flex; flex-direction: column; gap: 4px; }

.cat-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  width: 100%;
  text-align: left;
  padding: 9px 13px;
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  color: var(--text-dim);
  font-size: 0.88rem;
  transition: background 0.15s, color 0.15s;
}

.cat-btn:hover { background: var(--panel); color: var(--text); }

.cat-btn.is-active {
  background: var(--accent-soft);
  border-color: color-mix(in srgb, var(--accent) 45%, transparent);
  color: var(--accent-text);
  font-weight: 600;
}

.cat-btn .count {
  font-size: 0.74rem;
  padding: 1px 8px;
  border-radius: 999px;
  background: var(--panel-2);
  color: var(--text-dim);
  flex: none;
}

.content-head { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.content-head h2 { margin: 0; font-size: 1.35rem; }
.meta { margin: 0; color: var(--text-dim); font-size: 0.82rem; }

.chip-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }

.chip {
  padding: 6px 13px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text-dim);
  font-size: 0.8rem;
  transition: all 0.15s;
}

.chip:hover { color: var(--text); }
.chip.is-active { background: var(--accent); border-color: var(--accent); color: #fff; }
.chip-fav[aria-pressed="true"] { background: var(--warn); border-color: var(--warn); color: #1b1405; font-weight: 600; }

/* ---------- cards ---------- */
.results {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  gap: 16px;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: transform 0.15s, border-color 0.15s, box-shadow 0.15s;
}

.card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent) 50%, var(--border));
  box-shadow: var(--shadow);
}

.card-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; }
.card-title { margin: 0; font-size: 1rem; line-height: 1.4; }
.card-title-en { margin: 2px 0 0; font-size: 0.78rem; color: var(--text-dim); }

.fav-btn {
  border: 0;
  background: transparent;
  color: var(--text-dim);
  font-size: 1.1rem;
  line-height: 1;
  padding: 2px;
  flex: none;
}

.fav-btn.is-on { color: var(--warn); }

.card-tags { display: flex; flex-wrap: wrap; gap: 6px; }

.tag {
  font-size: 0.7rem;
  padding: 2px 9px;
  border-radius: 999px;
  background: var(--panel-2);
  color: var(--text-dim);
  border: 1px solid var(--border);
}

.tag-accent { background: var(--accent-soft); color: var(--accent-text); border-color: transparent; }

.card-text {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-dim);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-text + .card-text { padding-top: 8px; border-top: 1px dashed var(--border); }
.card-text.is-en { opacity: 0.8; }
.card mark { background: var(--accent-soft); color: var(--accent-text); border-radius: 3px; padding: 0 2px; }

.empty { text-align: center; padding: 60px 0; color: var(--text-dim); }

/* ---------- modal ---------- */
.modal { position: fixed; inset: 0; z-index: 50; display: grid; place-items: center; padding: 20px; }
.modal[hidden] { display: none; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(3, 7, 12, 0.66); backdrop-filter: blur(3px); }

.modal-panel {
  position: relative;
  width: min(760px, 100%);
  max-height: 88vh;
  overflow-y: auto;
  padding: 26px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.modal-close {
  position: absolute;
  top: 14px;
  right: 16px;
  border: 0;
  background: transparent;
  color: var(--text-dim);
  font-size: 1.6rem;
  line-height: 1;
}

.crumb { margin: 0 0 6px; font-size: 0.76rem; color: var(--accent-text); letter-spacing: 0.4px; }
.modal-panel h3 { margin: 0; font-size: 1.3rem; }
.modal-title-en { margin: 2px 0 20px; color: var(--text-dim); font-size: 0.88rem; }
.modal-body { display: flex; flex-direction: column; gap: 16px; }

.prompt-block { background: var(--panel-2); border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; }
.prompt-block-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 8px; }
.prompt-block-head h4 { margin: 0; font-size: 0.8rem; color: var(--text-dim); font-weight: 600; letter-spacing: 0.4px; }

.copy-btn {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  border-radius: 8px;
  padding: 4px 12px;
  font-size: 0.76rem;
}

.copy-btn:hover { border-color: var(--accent); color: var(--accent-text); }

.prompt-block pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: var(--font);
  font-size: 0.9rem;
  line-height: 1.7;
}

.modal-foot { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 18px; }

.toast {
  position: fixed;
  bottom: 26px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 60;
  padding: 10px 20px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 0.85rem;
  box-shadow: var(--shadow);
}

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: static; max-height: none; }
  .cat-nav { flex-direction: row; overflow-x: auto; padding-bottom: 6px; }
  .cat-btn { white-space: nowrap; border: 1px solid var(--border); }
}