@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@400;500;700;900&family=Playfair+Display:ital,wght@0,600;1,600&display=swap');
        
:root {
    --bg-purple: #fbf7ff;
    --purple-deep: #6c3fd1;
    --purple-light: #8f5de8;
    --gold-light: #ffe7a0;
    --gold-mid: #c79a2b;
    --gold-dark: #7f5910;
}

body { 
    font-family: 'Noto Sans TC', sans-serif; 
    background: radial-gradient(circle at top left, rgba(212,175,55,0.12), transparent 28%),
                radial-gradient(circle at top right, rgba(143,93,232,0.12), transparent 32%),
                linear-gradient(180deg, #fffdfa 0%, var(--bg-purple) 46%, #f8f2ff 100%);
    color: #2c2340; 
    overflow-x: hidden;
}

.font-serif-en { font-family: 'Playfair Display', serif; }

.glass-nav {
    backdrop-filter: blur(16px);
    background: rgba(255, 255, 255, 0.75);
    border-bottom: 1px solid rgba(199, 154, 43, 0.15);
}

.royal-gold-border {
    border: 1px solid transparent;
    border-radius: 1.5rem;
    background-clip: padding-box;
    position: relative;
    box-shadow: 0 20px 50px rgba(79, 44, 125, 0.08);
    background-color: rgba(255, 255, 255, 0.85);
}
.royal-gold-border::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 2px;
    background: linear-gradient(135deg, var(--gold-dark), var(--gold-light), var(--gold-mid));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
    opacity: 0.7;
}

.royal-gold-text {
    background: linear-gradient(135deg, var(--gold-dark) 0%, var(--gold-mid) 26%, var(--gold-light) 50%, var(--gold-mid) 76%, var(--gold-dark) 100%);
    -webkit-background-clip: text; 
    -webkit-text-fill-color: transparent;
}

/* =============================================
   翻轉卡片 — iOS/iPhone 圖片殘留修復版
   ============================================= */
.flip-card { 
    perspective: 1000px; 
    height: 440px;
    /* 建立獨立堆疊上下文，防止 z-index 穿透 */
    isolation: isolate;
}

.flip-card-inner { 
    position: relative; 
    width: 100%; 
    height: 100%; 
    transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1); 
    -webkit-transform-style: preserve-3d;
    transform-style: preserve-3d; 
    cursor: pointer;
    /* 提示瀏覽器此元素即將變換，提前建立 compositing layer */
    will-change: transform;
}

/* 桌面版 hover 翻轉 */
.flip-card:hover .flip-card-inner { transform: rotateY(180deg); }
/* 手機版 tap 翻轉（由 JS toggle .is-flipped class） */
.flip-card.is-flipped .flip-card-inner { transform: rotateY(180deg); }

.flip-card-front, .flip-card-back { 
    position: absolute; 
    width: 100%; 
    height: 100%; 
    -webkit-backface-visibility: hidden; 
    backface-visibility: hidden; 
    border-radius: 1.5rem;
    /* 強制 GPU compositing layer — 修復 iOS backface 穿透 */
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
    overflow: hidden;
}

.flip-card-front { 
    /* 正面：z-index 較低  */
    z-index: 1;
    -webkit-transform: translate3d(0, 0, 1px);
    transform: translate3d(0, 0, 1px);
}

.flip-card-back { 
    -webkit-transform: rotateY(180deg) translate3d(0, 0, 1px);
    transform: rotateY(180deg) translate3d(0, 0, 1px);
    z-index: 2;
    display: flex; 
    flex-direction: column; 
    justify-content: space-between; 
    padding: 2rem;
    background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(249,244,255,0.95));
}

/* 正面內的圖片容器 — 確保不穿透 */
.flip-card-front img {
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
}

.playlist-scroll::-webkit-scrollbar { width: 6px; }
.playlist-scroll::-webkit-scrollbar-thumb { background: rgba(143,93,232,0.2); border-radius: 999px; }
.playlist-scroll::-webkit-scrollbar-track { background: transparent; }

@keyframes toast-slide {
    0% { transform: translate(-50%, 100%); opacity: 0; }
    10% { transform: translate(-50%, 0); opacity: 1; }
    90% { transform: translate(-50%, 0); opacity: 1; }
    100% { transform: translate(-50%, 100%); opacity: 0; }
}
.toast-animate {
    animation: toast-slide 3.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.animate-fade-in-up {
    animation: fadeInUp 0.4s ease-out forwards;
}

.no-scrollbar::-webkit-scrollbar {
    display: none;
}

.social-float-dock {
    position: fixed;
    right: calc(18px + env(safe-area-inset-right, 0px));
    bottom: calc(18px + env(safe-area-inset-bottom, 0px));
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
}

.social-fab {
    position: relative;
    width: 60px;
    height: 60px;
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    background: rgba(255, 255, 255, 0.94);
    border: 1px solid rgba(123, 75, 211, 0.20);
    box-shadow: 0 14px 30px rgba(91, 50, 179, 0.16);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.social-fab:hover {
    transform: translateY(-2px) scale(1.04);
    background: rgba(255, 255, 255, 0.98);
    border-color: rgba(123, 75, 211, 0.42);
    box-shadow: 0 18px 34px rgba(91, 50, 179, 0.24);
}

.social-fab:focus-visible {
    outline: 2px solid rgba(123, 75, 211, 0.45);
    outline-offset: 3px;
}

.social-fab-label {
    font-size: 11px;
    font-weight: 900;
    letter-spacing: 0.7px;
    line-height: 1;
}

.social-fab-line .social-fab-label {
    color: #06C755;
}

.social-fab-youtube .social-fab-label {
    color: #FF0000;
}

.social-fab-instagram .social-fab-label {
    color: #C13584;
}

.social-fab-instagram svg {
    display: block;
}

.social-fab-instagram:hover {
    border-color: rgba(193, 53, 132, 0.35);
    box-shadow: 0 18px 34px rgba(193, 53, 132, 0.18);
}

.social-fab-tooltip {
    position: absolute;
    right: 72px;
    top: 50%;
    transform: translateY(-50%) translateX(6px);
    opacity: 0;
    pointer-events: none;
    white-space: nowrap;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(44, 35, 64, 0.92);
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.2px;
    box-shadow: 0 10px 24px rgba(44, 35, 64, 0.18);
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.social-fab:hover .social-fab-tooltip,
.social-fab:focus-visible .social-fab-tooltip {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
}

@media (max-width: 768px) {
    .social-float-dock {
        right: calc(14px + env(safe-area-inset-right, 0px));
        bottom: calc(14px + env(safe-area-inset-bottom, 0px));
        gap: 10px;
    }

    .social-fab {
        width: 54px;
        height: 54px;
    }

    .social-fab-label {
        font-size: 10px;
    }

    .social-fab-tooltip {
        display: none;
    }
}

/* 限量共創商品翻轉卡片 3D 邏輯 */
.product-card-container {
    perspective: 1000px;
    -webkit-perspective: 1000px;
    cursor: pointer;
}
.product-card-flip {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.8s cubic-bezier(0.4, 0.2, 0.2, 1);
    transform-style: preserve-3d;
    -webkit-transform-style: preserve-3d;
}
.product-card-container:hover .product-card-flip,
.product-card-container:active .product-card-flip {
    transform: rotateY(180deg);
    -webkit-transform: rotateY(180deg);
}
.product-card-front, .product-card-back {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border-radius: 20px;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    overflow: hidden;
}
.product-card-back {
    transform: rotateY(180deg);
    -webkit-transform: rotateY(180deg);
}

/* ==========================================
   LINE 登入按鈕樣式
   ========================================== */

/* 主要 CTA（手機版主按鈕） */
.line-login-btn {
    background: linear-gradient(135deg, #06C755, #00B843);
    color: #fff;
    border: none;
    cursor: pointer;
    letter-spacing: 0.5px;
}
.line-login-btn:hover {
    background: linear-gradient(135deg, #00B843, #009A38);
    box-shadow: 0 8px 24px rgba(6, 199, 85, 0.35);
}
.line-login-btn:active {
    transform: scale(0.97) !important;
}

/* 次要 CTA（桌面版次按鈕） */
.line-login-btn-secondary {
    background: #fff;
    color: #06C755;
    border: 2px solid #06C755;
    cursor: pointer;
    letter-spacing: 0.3px;
}
.line-login-btn-secondary:hover {
    background: #f0fff5;
    border-color: #00B843;
    box-shadow: 0 4px 16px rgba(6, 199, 85, 0.15);
}
.line-login-btn-secondary:active {
    transform: scale(0.97) !important;
}