/*
 * motion.css — 只作用於 motion.js 加上的 motion-* 類，不覆蓋一般排版。
 * 動畫只用 transform 與背景線；文字本身的透明度與位置從不變動。
 * 定位用 :where() 包裝（權重 0），styles.css 若已設定 position 會優先。
 */

.motion-js {
  --motion-gold: #c0a76d;
  --motion-gold-soft: rgba(192, 167, 109, 0.72);
  --motion-ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

:where(.motion-roster-row, .motion-defense-item, .motion-pledge) {
  position: relative;
}

/* M1｜九組名冊 */
.motion-roster-rule {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 1px;
  background: var(--motion-gold);
  opacity: 0.7;
  pointer-events: none;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 320ms var(--motion-ease);
  transition-delay: calc(var(--motion-i, 0) * 70ms);
}

.motion-roster.is-drawn .motion-roster-rule {
  transform: scaleX(1);
}

.motion-roster-link {
  color: inherit;
  text-decoration: none;
}

/* 整列可點；連結文字仍是組名本身 */
.motion-roster-link::after {
  content: "";
  position: absolute;
  inset: 0;
}

.motion-roster-row:hover .motion-roster-link,
.motion-roster-link:focus-visible {
  text-decoration: underline;
  text-decoration-color: var(--motion-gold);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.3em;
}

.motion-roster-link:focus-visible {
  outline: 2px solid var(--motion-gold);
  outline-offset: 3px;
  border-radius: 2px;
}

@supports selector(:has(a)) {
  .motion-roster-link:focus-visible {
    outline: none;
  }

  .motion-roster-row:has(.motion-roster-link:focus-visible) {
    outline: 2px solid var(--motion-gold);
    outline-offset: 2px;
  }
}

:where(.motion-group-card) {
  scroll-margin-top: var(--motion-scroll-offset, 6rem);
}

/* M2｜五道防線 */
.motion-defense-rule {
  position: absolute;
  top: -1px;
  right: 0;
  left: 0;
  height: 1px;
  background: var(--motion-gold);
  pointer-events: none;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 640ms var(--motion-ease);
}

.motion-defense-item.is-drawn .motion-defense-rule {
  transform: scaleX(1);
}

/* M3｜看不見的服事：行內背景線，不影響行高與換行 */
.motion-labor {
  padding-bottom: 0.12em;
  background-image: linear-gradient(var(--motion-gold-soft), var(--motion-gold-soft));
  background-position: 0 100%;
  background-repeat: no-repeat;
  background-size: 0% 1px;
  transition: background-size 700ms var(--motion-ease);
  transition-delay: calc(var(--motion-i, 0) * 140ms);
}

.motion-unseen.is-drawn .motion-labor {
  background-size: 100% 1px;
}

/* M4｜誓詞卡左側細線 */
.motion-pledge-rule {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 1px;
  background: var(--motion-gold);
  pointer-events: none;
  transform: scaleY(0);
  transform-origin: center top;
  transition: transform 1200ms var(--motion-ease);
}

.motion-pledge.is-drawn .motion-pledge-rule {
  transform: scaleY(1);
}

/* 減少動態與列印：全部定格為完成狀態 */
.motion-reduce .motion-roster-rule,
.motion-reduce .motion-defense-rule,
.motion-reduce .motion-pledge-rule {
  transform: none;
  transition: none;
}

.motion-reduce .motion-labor {
  background-size: 100% 1px;
  transition: none;
}

@media (prefers-reduced-motion: reduce) {
  .motion-js .motion-roster-rule,
  .motion-js .motion-defense-rule,
  .motion-js .motion-pledge-rule {
    transform: none;
    transition: none;
  }

  .motion-js .motion-labor {
    background-size: 100% 1px;
    transition: none;
  }
}

@media print {
  .motion-js .motion-roster-rule,
  .motion-js .motion-defense-rule,
  .motion-js .motion-pledge-rule {
    transform: none;
    transition: none;
  }

  .motion-js .motion-labor {
    background-size: 100% 1px;
    transition: none;
  }
}