/* ── Video lessons page ─────────────────────────────────────────── */
/* Signature: cards read as broadcast/signal panels — a slow conic-gradient
   glow traces the border on hover, and the play button pulses like a
   live-signal ping. One moving idea, everything else stays quiet. */

@property --lc-angle {
  syntax: '<angle>';
  inherits: false;
  initial-value: 0deg;
}

.lessons-empty {
  display: none;
  grid-column: 1 / -1;
  padding: 56px 24px;
  text-align: center;
  border-radius: 16px;
  border: 1px dashed color-mix(in srgb, var(--text) 12%, transparent);
  background: color-mix(in srgb, var(--text) 3%, transparent);
  color: var(--text3, #8b93ad);
  font-size: 0.9rem;
}
.lessons-empty.is-visible { display: block; }
.lessons-empty-glyph {
  display: block;
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 2.4rem;
  font-weight: 900;
  color: color-mix(in srgb, var(--mint) 45%, transparent);
  margin-bottom: 10px;
}

.lesson-card {
  position: relative;
  isolation: isolate;
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.3s ease !important;
}

.lesson-card::before {
  content: '';
  position: absolute;
  inset: -1px;
  z-index: 3;
  border-radius: inherit;
  padding: 1.5px;
  background: conic-gradient(from var(--lc-angle), var(--red, #e63946), var(--mint, #00f5d4), var(--red, #e63946));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
  animation: lc-spin 4s linear infinite paused;
}

.lesson-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 22px 50px rgba(0, 0, 0, 0.5), 0 0 32px rgba(0, 245, 212, 0.14);
}
.lesson-card:hover::before {
  opacity: 1;
  animation-play-state: running;
}

@keyframes lc-spin {
  to { --lc-angle: 360deg; }
}

.lesson-embed-wrap {
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--bg2);
  overflow: hidden;
}

.lesson-tag {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 2;
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 0.68rem;
  font-weight: 700;
  color: #002420;
  background: var(--mint, #00f5d4);
  padding: 3px 10px;
  border-radius: 100px;
  letter-spacing: 0.02em;
  box-shadow: 0 0 14px rgba(0, 245, 212, 0.5);
}

.lesson-poster-btn {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  padding: 0;
  border: none;
  cursor: pointer;
  background: var(--bg2);
  overflow: hidden;
}

.lesson-poster-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease, filter 0.3s;
}

.lesson-poster-btn:hover .lesson-poster-img {
  transform: scale(1.05);
  filter: brightness(1.05) saturate(1.1);
}

.lesson-poster-btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, color-mix(in srgb, var(--bg) 70%, transparent) 0%, transparent 55%);
  pointer-events: none;
}

.lesson-play-badge {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(230, 57, 70, 0.94);
  border: 1.5px solid color-mix(in srgb, var(--text) 25%, transparent);
  color: #fff;
  box-shadow: 0 8px 28px rgba(230, 57, 70, 0.5), 0 0 0 0 rgba(0, 245, 212, 0.45);
  transition: transform 0.22s cubic-bezier(0.34, 1.2, 0.64, 1), box-shadow 0.22s;
  z-index: 2;
  animation: lc-ping 2.6s ease-in-out infinite;
}
.lesson-play-badge svg { margin-left: 2px; }

@keyframes lc-ping {
  0%, 100% { box-shadow: 0 8px 28px rgba(230, 57, 70, 0.5), 0 0 0 0 rgba(0, 245, 212, 0.4); }
  50% { box-shadow: 0 8px 28px rgba(230, 57, 70, 0.5), 0 0 0 9px rgba(0, 245, 212, 0); }
}

.lesson-poster-btn:hover .lesson-play-badge {
  transform: translate(-50%, -50%) scale(1.08);
  box-shadow: 0 12px 36px rgba(230, 57, 70, 0.6), 0 0 0 0 rgba(0, 245, 212, 0.4);
}

.lesson-info { padding: 18px 20px 20px; }

.lesson-title {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1.4;
  color: var(--text);
  margin-bottom: 12px;
}

.lesson-info-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.lesson-yt-link {
  display: inline-flex;
  align-items: center;
  font-family: ui-monospace, 'SF Mono', 'Cascadia Code', Consolas, monospace;
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--mint, #00f5d4);
  text-decoration: none;
  padding: 5px 10px;
  border: 1px solid rgba(0, 245, 212, 0.25);
  border-radius: 6px;
  background: rgba(0, 245, 212, 0.05);
  transition: background 0.2s, border-color 0.2s;
}
.lesson-yt-link:hover { background: rgba(0, 245, 212, 0.16); border-color: rgba(0, 245, 212, 0.55); }

.avm-delete-btn {
  font-family: ui-monospace, 'SF Mono', 'Cascadia Code', Consolas, monospace;
  padding: 5px 10px;
  font-size: 0.66rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--sakura);
  background: rgba(255, 101, 132, 0.08);
  border: 1px solid rgba(255, 101, 132, 0.3);
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}
.avm-delete-btn:hover { background: rgba(255, 101, 132, 0.18); border-color: rgba(255, 101, 132, 0.55); }

@media (prefers-reduced-motion: reduce) {
  .lesson-play-badge { animation: none; }
  .lesson-card::before { animation: none; }
  .lesson-card, .lesson-poster-img, .lesson-play-badge { transition: none; }
}

.video-lightbox {
  position: fixed;
  inset: 0;
  z-index: 1300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px;
}
.video-lightbox[hidden] { display: none; }

.video-lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(28, 22, 20, 0.9);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.video-lightbox-box {
  position: relative;
  width: 100%;
  max-width: 960px;
  z-index: 1;
}

.video-lightbox-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--bg);
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--text) 10%, transparent);
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.6), 0 0 60px rgba(0, 245, 212, 0.15);
}
.video-lightbox-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.video-lightbox-close {
  position: absolute;
  top: -46px;
  right: 0;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: 1px solid color-mix(in srgb, var(--text) 15%, transparent);
  background: color-mix(in srgb, var(--text) 6%, transparent);
  color: var(--text);
  font-size: 1.3rem;
  line-height: 1;
  cursor: pointer;
  z-index: 2;
}
.video-lightbox-close:hover { border-color: rgba(230, 57, 70, 0.5); color: var(--red, #e63946); }

@media (max-width: 640px) {
  .video-lightbox-close { top: -42px; }
}

.avm-overlay {
  position: fixed;
  inset: 0;
  z-index: 1200;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.avm-overlay[hidden] { display: none; }

.avm-box {
  position: relative;
  width: 100%;
  max-width: 420px;
  background: var(--bg2, #14162b);
  border: 1px solid color-mix(in srgb, var(--text) 8%, transparent);
  border-radius: 18px;
  padding: 28px 26px 26px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.avm-box h3 {
  margin: 0 0 16px;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.05rem;
  color: var(--text);
  text-align: center;
}

.avm-close {
  position: absolute;
  top: 10px;
  right: 12px;
  width: 32px;
  height: 32px;
  border: 1px solid color-mix(in srgb, var(--text) 12%, transparent);
  border-radius: 10px;
  background: color-mix(in srgb, var(--text) 4%, transparent);
  color: var(--text3);
  font-size: 1.2rem;
  line-height: 1;
  cursor: pointer;
}
.avm-close:hover { color: var(--text); border-color: rgba(230, 57, 70, 0.4); }

.avm-input {
  width: 100%;
  box-sizing: border-box;
  padding: 12px 14px;
  margin-bottom: 12px;
  font-size: 0.9rem;
  color: var(--text);
  background: color-mix(in srgb, var(--text) 4%, transparent);
  border: 1px solid color-mix(in srgb, var(--text) 12%, transparent);
  border-radius: 10px;
}
.avm-input:focus {
  outline: none;
  border-color: var(--red, #e63946);
}

.avm-msg {
  min-height: 18px;
  margin-bottom: 12px;
  font-size: 0.8rem;
  text-align: center;
}
.avm-msg.is-error { color: var(--sakura); }
.avm-msg.is-ok { color: #86efac; }