/* Word of the Day — page-specific styles
   Loads on top of hub.css.
   Color system inspired by 大莊國小's Word of the Day units. */

:root {
  --wotd-blue: #2d6aa8;
  --wotd-blue-deep: #1c4d7e;
  --wotd-blue-soft: #e3eef8;
  --wotd-green: #5b9d5b;
  --wotd-green-deep: #3d7a3d;
  --wotd-green-soft: #e7f3e7;
  --wotd-orange: #d97818;
  --wotd-orange-deep: #a85a0c;
  --wotd-orange-soft: #fce7d0;
  --wotd-purple: #7e5fa3;
  --wotd-purple-deep: #5b417d;
  --wotd-purple-soft: #ece4f4;
  --wotd-pink: #d96b9a;
  --wotd-pink-soft: #fbe2ec;
}

/* Hero on /word-of-the-day/ now uses .hub-editorial-hero--wotd from hub.css. */

/* Sticky toolbar */
.wotd-toolbar-wrap {
  position: sticky; top: 0; z-index: 30;
  background: rgba(255,255,255,.97);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--hub-line);
}
.wotd-toolbar {
  max-width: 1200px; margin: 0 auto;
  padding: 16px 24px;
  display: grid; grid-template-columns: 1fr 280px auto; gap: 12px; align-items: center;
}
.wotd-search { margin: 0; }
.wotd-toolbar select {
  height: 48px; padding: 0 16px;
  border: 1px solid var(--hub-line); border-radius: 999px;
  background: #fff; font-size: .92rem; color: var(--hub-ink);
  font-family: var(--hub-en-font), var(--hub-zh-font);
  cursor: pointer;
  appearance: none;
  background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="%23888" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="6 9 12 15 18 9"/></svg>');
  background-repeat: no-repeat; background-position: right 14px center;
  background-size: 16px;
  padding-right: 38px;
  max-width: 100%;
  text-overflow: ellipsis;
}
.wotd-toolbar select:focus { outline: none; border-color: var(--hub-primary); }
.wotd-count {
  font-size: .85rem; color: var(--hub-ink-faint); font-weight: 500; white-space: nowrap;
}

.wotd-section { padding-top: 40px; }

/* Filter section */
.wotd-filters {
  padding-top: 40px;
  padding-bottom: 8px;
}
.wotd-filter-label {
  font-family: var(--hub-serif);
  font-size: 1.1rem; font-weight: 700;
  color: var(--hub-ink-soft);
  margin: 0 0 14px;
  letter-spacing: -.01em;
}
.wotd-theme-row, .wotd-az-row {
  display: flex; flex-wrap: wrap; gap: 8px;
}

/* Theme chip */
.wotd-theme-chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 14px;
  background: #fff;
  border: 1px solid var(--hub-line);
  border-radius: 999px;
  font-family: inherit; cursor: pointer;
  transition: background .15s, border-color .15s, color .15s;
  color: var(--hub-ink);
  font-size: .9rem;
}
.wotd-theme-chip:hover {
  border-color: var(--hub-primary);
  background: var(--hub-line-soft);
}
.wotd-theme-chip.is-active {
  background: var(--hub-primary); border-color: var(--hub-primary); color: #fff;
}
.wotd-theme-chip.is-active .ct {
  background: rgba(255,255,255,.25); color: #fff;
}
.wotd-theme-chip .en { font-weight: 600; }
.wotd-theme-chip .zh {
  font-family: var(--hub-zh-font);
  font-size: .82rem; color: var(--hub-ink-faint);
  margin-left: -2px;
}
.wotd-theme-chip.is-active .zh { color: rgba(255,255,255,.85); }
.wotd-theme-chip .ct {
  display: inline-block;
  padding: 2px 8px; border-radius: 999px;
  background: var(--hub-line-soft); color: var(--hub-ink-faint);
  font-size: .72rem; font-weight: 700;
  letter-spacing: .02em;
}
.wotd-theme-chip--all { font-weight: 700; }

/* A-Z chip */
.wotd-az-chip {
  display: inline-flex; flex-direction: column; align-items: center; justify-content: center;
  width: 44px; height: 44px;
  padding: 0;
  background: #fff;
  border: 1px solid var(--hub-line);
  border-radius: 8px;
  font-family: var(--hub-serif); font-weight: 700;
  font-size: 1.05rem;
  color: var(--hub-ink);
  cursor: pointer;
  transition: background .15s, border-color .15s, color .15s;
}
.wotd-az-chip:hover {
  border-color: var(--hub-primary);
  background: var(--hub-line-soft);
}
.wotd-az-chip.is-active {
  background: var(--hub-primary); border-color: var(--hub-primary); color: #fff;
}
.wotd-az-chip .ct {
  font-family: var(--hub-en-font); font-size: .58rem;
  font-weight: 500; color: var(--hub-ink-faint);
  margin-top: -1px;
}
.wotd-az-chip.is-active .ct { color: rgba(255,255,255,.75); }
.wotd-az-chip--all {
  width: auto; padding: 0 14px;
  letter-spacing: .05em;
}

/* Card grid — 1 col mobile, 2 col desktop (matches 大莊 design) */
.wotd-grid {
  display: grid; gap: 32px;
  grid-template-columns: 1fr;
}
@media (min-width: 880px) {
  .wotd-grid { grid-template-columns: repeat(2, 1fr); gap: 36px; }
}
.wotd-card {
  display: flex; flex-direction: column;
  background: #fff; border: 1px solid var(--hub-line);
  border-top: 8px solid var(--wotd-blue);
  border-radius: 14px;
  overflow: hidden;
  transition: transform .15s, box-shadow .15s;
  box-shadow: 0 6px 16px -6px rgba(28,77,126,.12);
}
.wotd-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 32px -10px rgba(28,77,126,.22);
}
/* 4-color rotation based on theme. Cycle is set via data-theme class */
.wotd-card.t-blue { border-top-color: var(--wotd-blue); }
.wotd-card.t-green { border-top-color: var(--wotd-green); }
.wotd-card.t-orange { border-top-color: var(--wotd-orange); }
.wotd-card.t-purple { border-top-color: var(--wotd-purple); }
.wotd-card.t-pink { border-top-color: var(--wotd-pink); }

/* Lazy YouTube facade */
.wotd-yt {
  position: relative; aspect-ratio: 16 / 9;
  background: #000; cursor: pointer; overflow: hidden;
  display: block;
}
.wotd-yt img {
  width: 100%; height: 100%; object-fit: cover;
  filter: brightness(.85);
  transition: filter .2s, transform .3s;
}
.wotd-yt:hover img { filter: brightness(1); transform: scale(1.02); }
.wotd-yt::after {
  content: ""; position: absolute; left: 50%; top: 50%;
  width: 64px; height: 64px; transform: translate(-50%, -50%);
  background: rgba(0,0,0,.65) no-repeat center/24px url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="white"><polygon points="6,4 20,12 6,20"/></svg>');
  border-radius: 50%; pointer-events: none;
  transition: background-color .2s;
}
.wotd-yt:hover::after { background-color: #e63946; }
.wotd-yt.loaded { cursor: default; }
.wotd-yt.loaded::after { display: none; }
.wotd-yt iframe { width: 100%; height: 100%; border: 0; }

.wotd-head {
  padding: 26px 30px 18px;
  min-height: 150px;
}
@media (min-width: 720px) {
  .wotd-head { padding: 32px 34px 20px; min-height: 180px; }
}
.wotd-num {
  font-family: var(--hub-serif);
  font-size: .8rem; font-weight: 700;
  letter-spacing: .22em; text-transform: uppercase;
  color: var(--wotd-orange-deep);
  margin: 0 0 6px;
}
.wotd-card.t-green .wotd-num { color: var(--wotd-green-deep); }
.wotd-card.t-orange .wotd-num { color: var(--wotd-orange-deep); }
.wotd-card.t-purple .wotd-num { color: var(--wotd-purple-deep); }
.wotd-card.t-pink .wotd-num { color: #b94c7f; }

.wotd-keyword {
  font-family: var(--hub-serif);
  font-size: 2rem; font-weight: 700;
  color: var(--wotd-blue-deep);
  margin: 0; line-height: 1.15;
  letter-spacing: -.005em;
}
@media (min-width: 720px) {
  .wotd-keyword { font-size: 2.6rem; }
}
.wotd-card.t-green .wotd-keyword { color: var(--wotd-green-deep); }
.wotd-card.t-orange .wotd-keyword { color: var(--wotd-orange-deep); }
.wotd-card.t-purple .wotd-keyword { color: var(--wotd-purple-deep); }
.wotd-card.t-pink .wotd-keyword { color: #b94c7f; }
.wotd-keyword .pos {
  font-family: var(--hub-serif);
  font-size: .55em; font-style: italic;
  color: var(--wotd-orange-deep);
  font-weight: 600; letter-spacing: .04em;
  margin-left: 6px;
  vertical-align: 2px;
}
.wotd-card.t-green .wotd-keyword .pos,
.wotd-card.t-orange .wotd-keyword .pos { color: var(--wotd-orange-deep); }
.wotd-card.t-purple .wotd-keyword .pos { color: var(--wotd-purple); }
.wotd-zh {
  font-family: var(--hub-zh-font);
  color: var(--hub-ink); font-size: 1.2rem;
  font-weight: 600; letter-spacing: .06em;
  margin: 8px 0 0;
}
@media (min-width: 720px) {
  .wotd-zh { font-size: 1.5rem; }
}

.wotd-body { padding: 22px 30px 28px; flex: 1; display: flex; flex-direction: column; gap: 14px; }
@media (min-width: 720px) {
  .wotd-body { padding: 26px 34px 32px; gap: 16px; }
}

.wotd-ex {
  background: var(--wotd-blue-soft);
  border-left: 4px solid var(--wotd-blue);
  border-radius: 10px;
  padding: 12px 16px;
}
.wotd-ex.alt {
  background: var(--wotd-green-soft);
  border-left-color: var(--wotd-green);
}
.wotd-card.t-green .wotd-ex { background: var(--wotd-green-soft); border-left-color: var(--wotd-green); }
.wotd-card.t-green .wotd-ex.alt { background: var(--wotd-blue-soft); border-left-color: var(--wotd-blue); }
.wotd-card.t-orange .wotd-ex { background: var(--wotd-orange-soft); border-left-color: var(--wotd-orange); }
.wotd-card.t-orange .wotd-ex.alt { background: var(--wotd-blue-soft); border-left-color: var(--wotd-blue); }
.wotd-card.t-purple .wotd-ex { background: var(--wotd-purple-soft); border-left-color: var(--wotd-purple); }
.wotd-card.t-purple .wotd-ex.alt { background: var(--wotd-green-soft); border-left-color: var(--wotd-green); }
.wotd-card.t-pink .wotd-ex { background: var(--wotd-pink-soft); border-left-color: var(--wotd-pink); }
.wotd-card.t-pink .wotd-ex.alt { background: var(--wotd-purple-soft); border-left-color: var(--wotd-purple); }
.wotd-ex { padding: 14px 18px; }
.wotd-ex .en {
  font-size: 1.05rem; line-height: 1.55;
  color: var(--hub-ink); font-weight: 500;
}
@media (min-width: 720px) {
  .wotd-ex .en { font-size: 1.15rem; }
}
.wotd-ex .en b {
  background: rgba(217,120,24,.18);
  color: var(--wotd-orange-deep);
  padding: 1px 5px; border-radius: 4px;
  font-weight: 700;
}
.wotd-card.t-green .wotd-ex .en b { background: rgba(217,120,24,.18); color: var(--wotd-orange-deep); }
.wotd-card.t-orange .wotd-ex .en b { background: rgba(28,77,126,.14); color: var(--wotd-blue-deep); }
.wotd-card.t-purple .wotd-ex .en b { background: rgba(217,120,24,.18); color: var(--wotd-orange-deep); }
.wotd-card.t-pink .wotd-ex .en b { background: rgba(28,77,126,.14); color: var(--wotd-blue-deep); }
.wotd-ex .zh {
  font-family: var(--hub-zh-font);
  font-size: .95rem; line-height: 1.6;
  color: var(--hub-ink-soft);
  margin-top: 6px;
}
@media (min-width: 720px) {
  .wotd-ex .zh { font-size: 1.02rem; }
}

.wotd-school {
  margin: auto -30px -28px; padding: 14px 30px;
  background: #fafaf6; border-top: 1px solid var(--hub-line);
  font-family: var(--hub-zh-font); font-size: .92rem;
  color: var(--hub-ink-soft); font-weight: 500;
  display: flex; align-items: center; gap: 8px;
}
@media (min-width: 720px) {
  .wotd-school { margin: auto -34px -32px; padding: 16px 34px; font-size: 1rem; }
}
.wotd-school::before {
  content: ""; display: inline-block; width: 14px; height: 14px;
  background: no-repeat center/contain url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="%232d6aa8" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="m4 6 8-3 8 3"/><path d="M4 10h16"/><path d="M4 10v10h16V10"/><path d="M8 21V14h8v7"/></svg>');
}

.wotd-empty {
  text-align: center; padding: 64px 24px;
  color: var(--hub-ink-soft);
}

/* Top contributing schools */
.wotd-credits { background: #fafaf6; margin-top: 80px; }
.wotd-top {
  list-style: none; padding: 0; margin: 24px 0 0;
  display: grid; gap: 10px;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  counter-reset: top;
}
.wotd-top li { counter-increment: top; }
.wotd-top-btn {
  display: flex; align-items: center; justify-content: space-between;
  width: 100%; gap: 12px;
  padding: 14px 16px;
  background: #fff; border: 1px solid var(--hub-line); border-radius: 8px;
  font-family: inherit; cursor: pointer; text-align: left;
  transition: border-color .15s, background .15s;
}
.wotd-top-btn::before {
  content: counter(top); flex-shrink: 0;
  width: 28px; height: 28px; display: inline-flex;
  align-items: center; justify-content: center;
  background: var(--hub-line-soft); border-radius: 50%;
  font-size: .78rem; font-weight: 700; color: var(--hub-primary-deep);
}
.wotd-top-btn strong { flex: 1; font-weight: 600; font-size: .92rem; }
.wotd-top-btn span { font-size: .8rem; color: var(--hub-ink-faint); }
.wotd-top-btn:hover { border-color: var(--hub-primary); background: var(--hub-line-soft); }

@media (max-width: 800px) {
  .wotd-toolbar { grid-template-columns: 1fr; }
  .wotd-toolbar .wotd-count { text-align: right; }
}