/* 광고매체 — 좌 아이폰 · 우 설명 카드 동기화 */
.channels-showcase {
  display: grid;
  grid-template-columns: minmax(260px, 340px) minmax(0, 1fr);
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
}

.channels-showcase__phone {
  display: flex;
  justify-content: center;
}

.hero-phone-wrap--channels {
  width: 100%;
}

.hero-phone-wrap--channels .hero-phone-device {
  margin: 0 auto;
}

/* JS 전환 — CSS keyframe 대신 */
.hero-phone-viewport--js .hero-phone-slide {
  animation: none !important;
  transition: opacity 0.45s ease, transform 0.45s ease, visibility 0.45s;
}

.hero-phone-viewport--js .hero-phone-slide.is-active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  z-index: 2;
  pointer-events: auto;
}

.hero-phone-viewport--js:not(:has(.is-active)) .hero-phone-slide:first-child {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  z-index: 2;
}

#channels-phone-viewport:empty {
  background: linear-gradient(180deg, #b2c7d9 0%, #c5d5e4 100%);
}

.channels-showcase__info {
  position: relative;
  height: clamp(400px, 46vw, 460px);
}

/* ── 광고 카드 패널 ── */
.channels-info-panel {
  --ch-accent: var(--accent);
  --ch-glow: rgba(255, 212, 0, 0.14);

  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 28px 24px 24px;
  border-radius: 22px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background:
    radial-gradient(ellipse 75% 50% at 50% -8%, var(--ch-glow), transparent 58%),
    linear-gradient(168deg, rgba(255, 255, 255, 0.07) 0%, rgba(255, 255, 255, 0.02) 38%, #0b0b0d 100%);
  box-shadow:
    0 24px 60px rgba(0, 0, 0, 0.5),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px) scale(0.985);
  transition: opacity 0.45s ease, transform 0.45s ease, visibility 0.45s;
  pointer-events: none;
}

.channels-info-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 14%;
  right: 14%;
  height: 3px;
  border-radius: 0 0 4px 4px;
  background: linear-gradient(90deg, transparent, var(--ch-accent), transparent);
}

.channels-info-panel::after {
  content: "AD MEDIA";
  position: absolute;
  top: 16px;
  right: 20px;
  font-family: "Space Grotesk", Pretendard, sans-serif;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: rgba(255, 255, 255, 0.22);
}

.channels-info-panel[data-channel="kakao"] {
  --ch-accent: #f5c000;
  --ch-glow: rgba(245, 192, 0, 0.18);
}

.channels-info-panel[data-channel="naver"] {
  --ch-accent: #03c75a;
  --ch-glow: rgba(3, 199, 90, 0.16);
}

.channels-info-panel[data-channel="meta"] {
  --ch-accent: #4d8dff;
  --ch-glow: rgba(77, 141, 255, 0.16);
}

.channels-info-panel[data-channel="google"] {
  --ch-accent: #4285f4;
  --ch-glow: rgba(66, 133, 244, 0.16);
}

.channels-info-panel[data-channel="youtube"] {
  --ch-accent: #ff0000;
  --ch-glow: rgba(255, 0, 0, 0.14);
}

.channels-info-panel[data-channel="daangn"] {
  --ch-accent: #ff7121;
  --ch-glow: rgba(255, 113, 33, 0.16);
}

.channels-info-panel[data-channel="lms"] {
  --ch-accent: #00d4aa;
  --ch-glow: rgba(0, 212, 170, 0.14);
}

.channels-info-panel.is-active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
  pointer-events: auto;
  z-index: 1;
}

.channels-info-panel__head {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  width: 100%;
  flex-shrink: 0;
}

.channels-info-panel .brand-mark {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.32);
}

.channels-info-panel__title {
  font-size: clamp(30px, 3.4vw, 38px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: #fff;
  margin: 0;
}

.channels-info-panel__sub {
  display: inline-block;
  margin-top: 4px;
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.92);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.14);
  white-space: nowrap;
}

.channels-info-panel__desc {
  font-size: clamp(17px, 1.75vw, 20px);
  line-height: 1.55;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.92);
  margin: 0 0 16px;
  max-width: 420px;
  letter-spacing: -0.01em;
  word-break: keep-all;
  flex-shrink: 0;
}

.channels-info-panel__list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  width: 100%;
  max-width: 100%;
  flex: 1;
  align-content: center;
}

.channels-info-panel__list li {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 68px;
  padding: 11px 10px;
  border-radius: 12px;
  font-size: clamp(14px, 1.4vw, 16px);
  font-weight: 700;
  line-height: 1.35;
  color: #fff;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.1);
  word-break: keep-all;
  text-wrap: balance;
}

.channels-info-panel__list li::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ch-accent);
  box-shadow: 0 0 8px var(--ch-accent);
  flex-shrink: 0;
}

.channels-dots {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 36px;
}

.channels-dots button {
  width: 9px;
  height: 9px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
  cursor: pointer;
  transition: background 0.25s ease, transform 0.25s ease;
}

.channels-dots button.is-active {
  background: var(--accent);
  transform: scale(1.15);
}

.channels-dots button:hover {
  background: rgba(255, 255, 255, 0.35);
}

.channels-dots button.is-active:hover {
  background: var(--accent);
}

@media (max-width: 900px) {
  .channels-showcase {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .channels-showcase__info {
    height: auto;
    min-height: 380px;
  }

  .channels-info-panel {
    position: relative;
    inset: auto;
    display: none;
    min-height: 360px;
  }

  .channels-info-panel.is-active {
    display: flex;
  }

  .channels-info-panel__list {
    grid-template-columns: 1fr;
  }

  .channels-info-panel__list li {
    min-height: 0;
    flex-direction: row;
    justify-content: center;
    padding: 12px 16px;
    font-size: 15px;
  }
}

@media (max-width: 520px) {
  .channels-info-panel {
    padding: 24px 18px 20px;
  }

  .channels-info-panel__title {
    font-size: 28px;
  }

  .channels-info-panel__desc {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero-phone-viewport--js .hero-phone-slide,
  .channels-info-panel {
    transition: none;
  }
}