/* =========================================================
   AKIWEI WATER PARTY — 顏色變數（統一管理，方便之後調整）
   ========================================================= */
:root {
  --color-bg: #123e93;
  --color-bg-dark: #102d73;
  --color-bg-deep: #082e70;
  --color-pink: #f44191;
  --color-cyan: #42d9ff;
  --color-yellow: #ffe45c;
  --color-white: #ffffff;

  /* 按鈕底色與光暈顏色（依各按鈕主色分開寫，避免 color-mix 相容性問題） */
  --btn-bg: rgba(4, 20, 75, 0.82);

  --transition-fast: 0.2s ease;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  overflow-x: hidden;
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", -apple-system, sans-serif;
  color: var(--color-white);
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-dark) 60%, var(--color-bg-deep) 100%);
}

/* 螢幕閱讀器專用文字，畫面上不顯示 */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* =========================================================
   版面容器
   ========================================================= */
.page {
  display: flex;
  flex-direction: column;
}

/* 桌面版才把海報在畫面中垂直置中，讓四周露出深藍背景；手機版海報從頂部開始，滿版顯示不留空白 */
@media (min-width: 769px) {
  .page {
    justify-content: center;
    min-height: 100vh;
  }
}

/* =========================================================
   海報主體：主視覺圖片當背景，按鈕與文字直接疊在圖片內
   ========================================================= */
.poster {
  position: relative;
  width: min(100%, 820px);
  margin: 0 auto;
  flex-shrink: 0;

  /* 主視覺背景：cover 讓寬度永遠完整鋪滿，position:top 確保上方標題與裝飾不被裁掉 */
  background-image: url("../images/main-visual.jpg");
  background-size: cover;
  background-position: top center;
  background-repeat: no-repeat;
  background-color: var(--color-bg-deep);

  display: flex;
  flex-direction: column;
}

/* 桌面版才做出「海報卡片」的樣子，手機版滿版無邊框 */
@media (min-width: 769px) {
  .poster {
    margin-block: clamp(20px, 4vw, 48px);
    border-radius: 24px;
    overflow: hidden;
    box-shadow: 0 24px 70px rgba(0, 0, 0, 0.45);
  }
}

/* 內容區：留出上方空間給主視覺原本的標題／Disco 球／墨鏡，文字與按鈕落在圖片中下段的深藍空白處 */
.poster-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  /* 38% 為預留給主視覺標題／Disco 球／墨鏡的空間，數值依實測調整，避免蓋到圖片標題 */
  padding-top: 38%;
  padding-bottom: clamp(20px, 4vw, 32px);
}

/* =========================================================
   按鈕群組
   ========================================================= */
.poster-buttons {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(14px, 2.6vw, 20px);
  padding: 0 16px;
}

/* =========================================================
   霓虹按鈕
   ========================================================= */
.neon-btn {
  --btn-color: var(--color-cyan);
  --btn-glow: rgba(66, 217, 255, 0.5);

  width: 100%;
  max-width: 480px;
  display: flex;
  align-items: center;
  gap: clamp(12px, 3vw, 20px);
  min-height: 76px;
  padding: clamp(14px, 2.2vw, 18px) clamp(16px, 3vw, 26px);
  border-radius: clamp(14px, 2vw, 18px);
  background: var(--btn-bg);
  border: 2px solid var(--btn-color);
  box-shadow:
    0 0 10px var(--btn-glow),
    inset 0 0 12px rgba(255, 255, 255, 0.04);
  color: var(--color-white);
  text-decoration: none;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.neon-btn--pink {
  --btn-color: var(--color-pink);
  --btn-glow: rgba(244, 65, 145, 0.5);
}

.neon-btn--yellow {
  --btn-color: var(--color-yellow);
  --btn-glow: rgba(255, 228, 92, 0.45);
}

.neon-btn:hover,
.neon-btn:focus-visible {
  transform: translateY(-2px);
  box-shadow:
    0 0 18px var(--btn-glow),
    inset 0 0 14px rgba(255, 255, 255, 0.06);
  border-color: var(--color-white);
}

.neon-btn:focus-visible {
  outline: 3px solid var(--color-white);
  outline-offset: 3px;
}

.neon-btn:active {
  transform: translateY(-2px) scale(0.98);
}

.neon-btn__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: clamp(32px, 6vw, 40px);
  height: clamp(32px, 6vw, 40px);
  flex-shrink: 0;
  color: var(--btn-color);
}

.neon-btn__icon svg {
  width: 100%;
  height: 100%;
}

.neon-btn__text {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
  text-align: left;
}

.neon-btn__zh {
  font-size: clamp(1.02rem, 3.4vw, 1.2rem);
  font-weight: 800;
  letter-spacing: 0.02em;
  overflow-wrap: break-word;
}

.neon-btn__en {
  font-size: clamp(0.68rem, 2vw, 0.78rem);
  font-weight: 600;
  color: var(--btn-color);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.neon-btn__arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  width: clamp(20px, 4vw, 24px);
  height: clamp(20px, 4vw, 24px);
  flex-shrink: 0;
  color: var(--btn-color);
  transition: transform var(--transition-fast);
}

.neon-btn__arrow svg {
  width: 100%;
  height: 100%;
}

.neon-btn:hover .neon-btn__arrow,
.neon-btn:focus-visible .neon-btn__arrow {
  transform: translateX(4px);
}

/* 動畫減弱偏好：停用位移與縮放 */
@media (prefers-reduced-motion: reduce) {
  .neon-btn,
  .neon-btn__arrow {
    transition: none;
  }
  .neon-btn:hover,
  .neon-btn:focus-visible,
  .neon-btn:active {
    transform: none;
  }
  .neon-btn:hover .neon-btn__arrow,
  .neon-btn:focus-visible .neon-btn__arrow {
    transform: none;
  }
}

/* =========================================================
   Footer（在海報內最下方）
   ========================================================= */
.poster-footer {
  margin-top: clamp(20px, 4vw, 32px);
  text-align: center;
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.75);
  text-shadow: 0 1px 6px rgba(0, 0, 0, 0.5);
}

.poster-footer p {
  margin: 3px 0;
}

.poster-footer a {
  color: var(--color-cyan);
  text-decoration: underline;
}

.poster-footer a:hover,
.poster-footer a:focus-visible {
  color: var(--color-white);
}

/* =========================================================
   RWD：桌面 769px 以上，按鈕寬度收窄置中
   ========================================================= */
@media (min-width: 769px) {
  .poster-buttons {
    padding: 0;
  }

  .neon-btn {
    width: min(72%, 480px);
  }
}