/* =========================================================
   Demo Dialog — native <dialog> element 教學
   ========================================================= */
.demo-dialog {
  /* 用 fixed + inset auto + margin auto 強制居中（破返 [data-annotate] position: relative）*/
  position: fixed;
  inset: 0;
  margin: auto;
  border: none;
  border-radius: 24px;
  padding: 0;
  background: var(--card);
  color: var(--ink);
  max-width: 560px;
  width: 92vw;
  height: fit-content;
  max-height: 90vh;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.demo-dialog:not([open]) { display: none; }
.demo-dialog::backdrop {
  background: rgba(15, 15, 26, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.demo-dialog[open] {
  animation: dialog-pop 0.28s var(--ease);
}
@keyframes dialog-pop {
  from { transform: scale(0.92) translateY(20px); opacity: 0; }
  to { transform: scale(1) translateY(0); opacity: 1; }
}
.demo-dialog-close {
  position: absolute;
  top: 14px; right: 14px;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.85);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
  color: var(--ink);
  border: none;
  cursor: pointer;
  z-index: 2;
}
.demo-dialog-video {
  aspect-ratio: 16 / 9;
  background:
    radial-gradient(ellipse at center, color-mix(in srgb, var(--coral) 22%, transparent), transparent 60%),
    linear-gradient(135deg, #1A1A2E 0%, #2A1B4A 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #fff;
  position: relative;
}
.demo-dialog-play {
  width: 72px; height: 72px;
  border-radius: 50%;
  background: rgba(255,255,255,0.92);
  color: var(--ink);
  display: flex; align-items: center; justify-content: center;
  font-size: 24px;
  padding-left: 4px;
  margin-bottom: 12px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
  animation: dialog-play-pulse 2s ease-in-out infinite;
}
@keyframes dialog-play-pulse {
  0%, 100% { box-shadow: 0 8px 24px rgba(0,0,0,0.3), 0 0 0 0 rgba(255,255,255,0.4); }
  50% { box-shadow: 0 8px 24px rgba(0,0,0,0.3), 0 0 0 18px rgba(255,255,255,0); }
}
.demo-dialog-poster {
  font-size: 14px;
  color: rgba(255,255,255,0.85);
  letter-spacing: 0.04em;
}
.demo-dialog-body { padding: 24px 28px 26px; }
.demo-dialog-body h3 {
  font-family: var(--font-display);
  font-size: 22px;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}
.demo-dialog-body p {
  color: var(--ink-soft);
  font-size: 14.5px;
  line-height: 1.6;
  margin-bottom: 14px;
}
.demo-dialog-meta {
  display: flex;
  gap: 8px;
  font-size: 12px;
  color: var(--muted);
  align-items: center;
}

/* Celebration modal */
.celebration-modal { z-index: 2200; }
.celebrate-card {
  max-width: 520px;
  position: relative;
  padding: 44px 36px 32px;
  text-align: center;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(255,107,71,0.12), transparent 50%),
    var(--card);
}
.celebrate-emoji {
  font-size: 56px;
  margin-bottom: 12px;
  animation: celebrate-bounce 1.6s ease-in-out;
}
@keyframes celebrate-bounce {
  0% { transform: scale(0.3) rotate(-20deg); opacity: 0; }
  60% { transform: scale(1.15) rotate(10deg); opacity: 1; }
  100% { transform: scale(1) rotate(0); opacity: 1; }
}
.celebrate-card h2 {
  font-family: var(--font-display);
  font-size: 32px;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}
.celebrate-lead {
  font-size: 15px;
  color: var(--ink-soft);
  margin-bottom: 18px;
  line-height: 1.6;
}
.celebrate-bullets {
  list-style: none;
  text-align: left;
  margin: 0 auto 22px;
  padding: 16px 18px;
  background: var(--soft);
  border-radius: 14px;
  max-width: 380px;
}
.celebrate-bullets li {
  font-size: 14px;
  color: var(--ink-soft);
  padding: 6px 0 6px 26px;
  position: relative;
  line-height: 1.5;
}
.celebrate-bullets li::before {
  content: '✓';
  position: absolute;
  left: 0;
  top: 6px;
  color: var(--mint);
  font-weight: 700;
}
.celebrate-bullets strong { color: var(--ink); font-weight: 600; margin-right: 2px; }
.celebrate-tip {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 22px;
  line-height: 1.55;
}
.celebrate-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 14px;
}
.celebrate-actions .btn { width: 100%; justify-content: center; }
@media (min-width: 480px) {
  .celebrate-actions { flex-direction: row; }
  .celebrate-actions .btn { flex: 1; }
}
.celebrate-share {
  font-size: 12px;
  color: var(--muted);
  margin-top: 4px;
}
.celebrate-share.copied { color: var(--mint); }
.celebrate-card .close {
  position: absolute;
  top: 16px; right: 16px;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--soft);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  color: var(--ink-soft);
  border: none;
  cursor: pointer;
}
.celebrate-card .close:hover { background: var(--line); }

/* About modal */
.about-modal { z-index: 2100; }
.about-card { max-width: 540px; text-align: left; position: relative; padding: 36px 36px 32px; }
.about-card h2 {
  font-family: var(--font-display);
  font-size: 26px;
  letter-spacing: -0.01em;
  margin-bottom: 16px;
  text-align: left;
}
.about-card h3 {
  font-size: 14px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 700;
  margin-top: 22px;
  margin-bottom: 10px;
}
.about-card p {
  font-size: 14.5px;
  color: var(--ink-soft);
  line-height: 1.65;
  margin-bottom: 12px;
  text-align: left;
}
.about-card p strong { color: var(--ink); font-weight: 600; }
.about-bullets {
  list-style: none;
  padding: 0;
  margin: 0 0 12px;
  text-align: left;
}
.about-bullets li {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.55;
  padding: 6px 0 6px 22px;
  position: relative;
}
.about-bullets li::before {
  content: '→';
  position: absolute;
  left: 0;
  top: 6px;
  color: var(--coral);
  font-weight: 700;
}
.about-card .btn {
  margin-top: 20px;
  width: 100%;
  justify-content: center;
}
.about-card .close {
  position: absolute;
  top: 16px; right: 16px;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--soft);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  color: var(--ink-soft);
  border: none;
  cursor: pointer;
}
.about-card .close:hover { background: var(--line); }
.intro-actions {
  display: flex;
  gap: 10px;
  flex-direction: column;
  margin-top: 8px;
}
.intro-actions .btn { width: 100%; justify-content: center; }
@media (min-width: 480px) {
  .intro-actions { flex-direction: row; }
  .intro-actions .btn { flex: 1; }
}
.code-block .k { color: #FFB199; }
.code-block .v { color: #8EE0C7; }
.code-block .c { color: #8B8B9A; }

/* Intro overlay */
.intro {
  position: fixed;
  inset: 0;
  background: rgba(26,26,46,0.6);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 1;
  transition: opacity 0.4s;
}
.intro.hidden { opacity: 0; pointer-events: none; }
.intro-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  padding: 40px;
  max-width: 480px;
  text-align: center;
  box-shadow: var(--shadow-lg);
}
.intro-card .emoji { font-size: 44px; margin-bottom: 16px; }
.intro-card h2 {
  font-family: var(--font-display);
  font-size: 26px;
  letter-spacing: -0.01em;
  margin-bottom: 10px;
}
.intro-card p {
  color: var(--ink-soft);
  font-size: 14.5px;
  line-height: 1.65;
  margin-bottom: 24px;
}
.intro-card .legend-row {
  display: flex;
  justify-content: center;
  gap: 18px;
  margin-bottom: 24px;
  font-size: 12px;
}
.intro-card .legend-row .legend-item .legend-swatch {
  width: 14px; height: 14px;
}

/* Reveal on scroll — 漸進增強：只喺有 JS 時先 hide */
.reveal {
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.js .reveal {
  opacity: 0;
  transform: translateY(24px);
}
.reveal.in { opacity: 1; transform: translateY(0); }
/* 冇 JS（crawler / 關咗 script）一定睇得到 */
@media (scripting: none) {
  .reveal { opacity: 1 !important; transform: none !important; }
}