/* AI Taiwan 101 — shared design tokens */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@400;500;700;900&family=Noto+Serif+TC:wght@700;900&family=DM+Sans:wght@500;700;800&display=swap');

:root {
  /* brand colors */
  --coral:        #FF6A55;
  --coral-soft:   #FFE3DC;
  --coral-deep:   #D94B36;

  --mint:         #2FCC9E;
  --mint-soft:    #D5F4E8;
  --mint-deep:    #16A37A;

  --yellow:       #FFC93A;
  --yellow-soft:  #FFF1C2;
  --yellow-deep:  #D9A20F;

  --sky:          #6FB3FF;       /* tertiary accent for thumbnails */
  --sky-soft:     #E1EFFF;

  /* surfaces */
  --cream:        #FFF8EE;        /* page background */
  --cream-2:      #FCEFD9;
  --paper:        #FFFFFF;
  --ink:          #1B1714;
  --ink-2:        #5A5048;
  --ink-3:        #8A7F73;
  --line:         #ECE2D0;
  --line-strong:  #DDD0BA;

  /* radii */
  --r-xs: 8px;
  --r-sm: 12px;
  --r-md: 18px;
  --r-lg: 24px;
  --r-pill: 999px;

  /* shadow */
  --shadow-card: 0 1px 0 rgba(27,23,20,.04), 0 6px 18px rgba(27,23,20,.06);
  --shadow-pop:  0 2px 0 rgba(27,23,20,.05), 0 14px 36px rgba(27,23,20,.10);
}

/* base — scoped to .ai101 so it can't leak into the design canvas chrome */
.ai101 {
  font-family: "Noto Sans TC", "DM Sans", system-ui, sans-serif;
  color: var(--ink);
  background: var(--cream);
  line-height: 1.55;
  font-feature-settings: "palt" 1;
  -webkit-font-smoothing: antialiased;
  letter-spacing: 0.005em;
}
.ai101 * { box-sizing: border-box; }
.ai101 h1, .ai101 h2, .ai101 h3, .ai101 h4 {
  margin: 0;
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.18;
  color: var(--ink);
}
.ai101 p { margin: 0; }
.ai101 a { color: inherit; text-decoration: none; }
.ai101 button { font-family: inherit; cursor: pointer; border: none; background: none; padding: 0; color: inherit; }

/* logo wordmark — used for "AI Taiwan 101" text */
.ai101 .wordmark {
  font-family: "DM Sans", "Noto Sans TC", sans-serif;
  font-weight: 800;
  letter-spacing: -0.02em;
}

/* nav */
.ai101 .nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px;
}
.ai101 .nav-links {
  display: flex; align-items: center; gap: 28px;
  font-size: 15px; font-weight: 500; color: var(--ink-2);
}
.ai101 .nav-links a { transition: color .15s; }
.ai101 .nav-links a:hover { color: var(--ink); }
.ai101 .nav-links a.is-active { color: var(--ink); font-weight: 700; }

/* pill chips */
.ai101 .pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px; border-radius: var(--r-pill);
  font-size: 13px; font-weight: 700; letter-spacing: 0.01em;
  background: var(--paper);
  border: 1.5px solid var(--line);
  color: var(--ink-2);
  white-space: nowrap;
  transition: transform .12s, box-shadow .12s;
}
.ai101 .pill-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--ink-3);
}
.ai101 .pill.cat-tool       { color: var(--mint-deep);   border-color: var(--mint); background: var(--mint-soft); }
.ai101 .pill.cat-tool .pill-dot { background: var(--mint-deep); }
.ai101 .pill.cat-founder    { color: var(--coral-deep);  border-color: var(--coral); background: var(--coral-soft); }
.ai101 .pill.cat-founder .pill-dot { background: var(--coral-deep); }
.ai101 .pill.cat-trend      { color: var(--yellow-deep); border-color: var(--yellow); background: var(--yellow-soft); }
.ai101 .pill.cat-trend .pill-dot { background: var(--yellow-deep); }

.ai101 .pill.is-active {
  background: var(--ink);
  color: var(--cream);
  border-color: var(--ink);
}
.ai101 .pill.is-active .pill-dot { background: var(--cream); }

/* primary CTA — chunky coral pill */
.ai101 .btn-primary {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 24px;
  background: var(--coral);
  color: #fff;
  border-radius: var(--r-pill);
  font-weight: 700;
  font-size: 16px;
  box-shadow: 0 2px 0 var(--coral-deep), 0 10px 24px rgba(255,106,85,.28);
  transition: transform .12s;
}
.ai101 .btn-primary:hover { transform: translateY(-1px); }
.ai101 .btn-ghost {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 16px;
  background: var(--paper);
  border: 1.5px solid var(--line-strong);
  border-radius: var(--r-pill);
  font-weight: 700;
  font-size: 14px;
  color: var(--ink);
}

/* video card */
.ai101 .card {
  background: var(--paper);
  border: 1.5px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: transform .15s, box-shadow .15s, border-color .15s;
  display: flex; flex-direction: column;
}
.ai101 .card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
  border-color: var(--line-strong);
}
.ai101 .card-thumb {
  position: relative;
  aspect-ratio: 16/10;
  overflow: hidden;
}
.ai101 .card-body {
  padding: 18px 18px 20px;
  display: flex; flex-direction: column; gap: 12px; flex: 1;
}
.ai101 .card-title {
  font-size: 18px; font-weight: 900; line-height: 1.35;
  letter-spacing: -0.005em;
  /* clamp */
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical;
  overflow: hidden;
  text-wrap: pretty;
}
.ai101 .card-meta {
  display: flex; align-items: center; justify-content: space-between;
  font-size: 13px; color: var(--ink-3); font-weight: 500;
  margin-top: auto;
}
.ai101 .card-channel { display: inline-flex; align-items: center; gap: 6px; font-weight: 700; color: var(--ink-2); }
.ai101 .card-readtime { display: inline-flex; align-items: center; gap: 4px; }

/* footer */
.ai101 .footer {
  border-top: 1.5px solid var(--line);
  padding: 36px 0 30px;
  color: var(--ink-3);
  font-size: 13px;
}

/* article (detail page) typography */
.ai101 .prose {
  font-size: 17px;
  line-height: 1.85;
  color: #2A241F;
  letter-spacing: 0.012em;
}
.ai101 .prose p { margin: 0 0 1.1em; }
.ai101 .prose h2 {
  font-size: 26px; font-weight: 900;
  margin: 2.2em 0 0.8em;
  letter-spacing: -0.01em;
  line-height: 1.3;
  position: relative;
}
.ai101 .prose h2 .h2-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px;
  background: var(--yellow);
  color: var(--ink);
  border-radius: 10px;
  font-family: "DM Sans", sans-serif;
  font-size: 17px; font-weight: 800;
  margin-right: 12px;
  transform: rotate(-4deg);
  box-shadow: 0 2px 0 var(--yellow-deep);
}
.ai101 .prose h3 {
  font-size: 19px; font-weight: 800;
  margin: 1.6em 0 0.5em;
  color: var(--ink);
}
.ai101 .prose ul { padding-left: 0; list-style: none; margin: 0 0 1.4em; }
.ai101 .prose ul li {
  position: relative;
  padding-left: 26px;
  margin-bottom: 0.55em;
}
.ai101 .prose ul li::before {
  content: '';
  position: absolute;
  left: 4px; top: 0.75em;
  width: 8px; height: 8px;
  background: var(--coral);
  border-radius: 2px;
  transform: rotate(45deg);
}
.ai101 .prose strong { font-weight: 800; background: linear-gradient(transparent 60%, var(--yellow-soft) 60%); padding: 0 2px; }
.ai101 .prose .pullquote {
  margin: 2em 0;
  padding: 24px 28px;
  background: var(--cream-2);
  border-radius: var(--r-md);
  border-left: 6px solid var(--coral);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--ink);
  letter-spacing: 0.01em;
}
.ai101 .prose .callout {
  margin: 1.8em 0;
  padding: 22px 26px;
  background: var(--mint-soft);
  border: 1.5px solid var(--mint);
  border-radius: var(--r-md);
}
.ai101 .prose .callout-title {
  font-weight: 800; color: var(--mint-deep);
  display: flex; align-items: center; gap: 8px;
  margin-bottom: 8px; font-size: 14px; letter-spacing: 0.04em; text-transform: uppercase;
}
.ai101 .prose .callout p { font-size: 16px; line-height: 1.75; color: var(--ink); margin: 0; }

/* a section header with playful chip-tag */
.ai101 .section-tag {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px;
  background: var(--ink);
  color: var(--cream);
  border-radius: var(--r-pill);
  font-size: 12px; font-weight: 700;
  letter-spacing: 0.08em;
}

/* utility */
.ai101 .stack { display: flex; flex-direction: column; }
.ai101 .row   { display: flex; flex-direction: row; }