/* [DESIGN UPGRADE - v15 - Interactive Memories] */
@import url('https://fonts.googleapis.com/css2?family=Lora:ital,wght@0,400..700;1,400..700&family=Montserrat:wght@300;400;700&family=Playfair+Display:ital,wght@0,400..900;1,400..900&display=swap');

:root {
    --bg-dark: #02040a;
    --text-primary: #F0F2F5;
    --text-secondary: #C8CDD8;
    --accent-glow-start: rgba(240, 242, 245, 0.8);
    --accent-glow-end: rgba(200, 205, 216, 0.2);
    --accent-glow-border: #E0E6F0;
    --accent-glow-shadow: rgba(224, 230, 240, 0.4);
    --accent-gradient: linear-gradient(90deg, #A8C0FF, #F0F2F5, #A8C0FF);
    --aurora-green: #00ffc3;
    --aurora-blue: #00aaff;
    --aurora-violet: #a950ff;
    --font-title-mobile: 'Playfair Display', serif;
    --font-title-desktop: 'Lora', serif;
    --font-body: 'Montserrat', sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-body); background-color: var(--bg-dark);
    color: var(--text-primary); min-height: 100vh; overflow-x: hidden;
    -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
}

/* ===== 背景和粒子效果 ===== */
.background-overlay, .aurora-container, .background { position: fixed; top: 0; left: 0; width: 100%; height: 100%; }
.background-overlay { background-image: none; background-color: var(--bg-dark); z-index: -3; }
.aurora-container { opacity: 0.6; filter: blur(80px); z-index: -2; }
.aurora-beam { position: absolute; top: 50%; left: 50%; width: 200vw; height: 200vw; border-radius: 50%; transform-origin: center center; mix-blend-mode: screen; }
.aurora-beam.color-1 { background: radial-gradient(circle, var(--aurora-green) 5%, transparent 40%); animation: aurora-flow-1 25s infinite linear; }
.aurora-beam.color-2 { background: radial-gradient(circle, var(--aurora-blue) 5%, transparent 40%); animation: aurora-flow-2 30s infinite linear; }
.aurora-beam.color-3 { background: radial-gradient(circle, var(--aurora-violet) 5%, transparent 40%); animation: aurora-flow-3 35s infinite linear; }
@keyframes aurora-flow-1 { 0% { transform: translate(-50%, -50%) rotate(0deg) scale(0.8, 1); } 50% { transform: translate(-40%, -60%) rotate(180deg) scale(1.2, 0.9); } 100% { transform: translate(-50%, -50%) rotate(360deg) scale(0.8, 1); } }
@keyframes aurora-flow-2 { 0% { transform: translate(-50%, -50%) rotate(0deg) scale(1, 1); } 50% { transform: translate(-60%, -40%) rotate(-180deg) scale(0.9, 1.2); } 100% { transform: translate(-50%, -50%) rotate(-360deg) scale(1, 1); } }
@keyframes aurora-flow-3 { 0% { transform: translate(-50%, -50%) rotate(0deg) scale(1.1); } 50% { transform: translate(-45%, -55%) rotate(180deg) scale(0.8); } 100% { transform: translate(-50%, -50%) rotate(360deg) scale(1.1); } }
.background { z-index: -1; }
.particle { position: absolute; background: var(--text-primary); border-radius: 50%; opacity: 0; }
@keyframes float-particle { from { transform: translateY(100vh) scale(0.5); } to { transform: translateY(-10vh) scale(1); } }
@keyframes twinkle { 0%, 100% { opacity: 0.2; } 50% { opacity: 1; } }
.shooting-star { position: absolute; height: 2px; background: linear-gradient(-45deg, rgba(240, 242, 245, 1), rgba(240, 242, 245, 0)); border-radius: 999px; filter: drop-shadow(0 0 6px rgba(240, 242, 245, 0.5)); animation: shoot 3s infinite linear; }
@keyframes shoot { 0% { transform: translateX(0) translateY(0) rotate(-45deg); opacity: 1; width: 0; } 70% { opacity: 1; } 100% { transform: translateX(-50vw) translateY(50vw) rotate(-45deg); opacity: 0; width: 200px; } }
@keyframes moonlight-text-flow { 0% { background-position: 0% 50%; } 100% { background-position: 200% 50%; } }
.animated-gradient-text { background: var(--accent-gradient); background-size: 200% 200%; background-clip: text; -webkit-background-clip: text; -webkit-text-fill-color: transparent; animation: moonlight-text-flow 5s infinite linear; }

/* ===== 通用内容层 ===== */
.header, .main-content { position: relative; z-index: 1; }
.header { text-align: center; animation: fadeInDown 1.5s ease-out; }
.main-title { font-family: var(--font-title-desktop); letter-spacing: 0.08em; text-shadow: 0 0 20px rgba(200, 205, 216, 0.3); }
.subtitle { color: var(--text-secondary); letter-spacing: 0.3em; text-transform: uppercase; font-weight: 300; }
@keyframes fadeInDown { from { opacity: 0; transform: translateY(-30px); } to { opacity: 1; transform: translateY(0); } }

/* ======================================================= */
/* =========== MOBILE STYLES (<= 900px) ================ */
/* ======================================================= */
.mobile-active .container { perspective: 1px; transform-style: preserve-3d; height: 100vh; overflow-y: scroll; overflow-x: hidden; }
.mobile-active .aurora-container { transform: translateZ(-2px) scale(3); }
.mobile-active .particle, .mobile-active .shooting-star { transform: translateZ(-1px) scale(1.5); }
.mobile-active .header, .mobile-active .main-content { transform: translateZ(0); }
.mobile-active .header { padding: 15vh 20px 20vh; }
.mobile-active .main-title { display: flex; flex-direction: column; align-items: center; line-height: 1.2; }
.title-line-1 { font-size: 6vw; font-weight: 400; letter-spacing: 0.2em; color: var(--text-secondary); margin-bottom: 5px; }
.title-line-2 { font-size: 10vw; font-family: var(--font-title-mobile); font-weight: 700; }
.mobile-active .subtitle { font-size: 3.5vw; margin-top: 25px; }
.mobile-active .main-content { padding: 0 20px 20vh; }
.mobile-timeline { position: relative; max-width: 500px; margin: 0 auto; }
.timeline-line { position: absolute; top: 0; bottom: 0; left: 10px; width: 1px; background-image: linear-gradient(to bottom, transparent, var(--accent-glow-border), transparent); z-index: 0; opacity: 0.5; }
.story-card-mobile { position: relative; padding-left: 35px; margin-bottom: 25vh; }
.timeline-dot { position: absolute; left: 0; top: 30px; width: 20px; height: 20px; background-color: transparent; background-image: none; border: 2px solid var(--text-secondary); border-radius: 50%; z-index: 1; transition: all 0.5s ease; }
.story-card-mobile.is-visible .timeline-dot { transform: scale(1.2); border-color: var(--accent-glow-border); box-shadow: 0 0 20px 5px var(--accent-glow-shadow); background-image: radial-gradient(circle, var(--accent-glow-start) 0%, var(--accent-glow-end) 70%); }
.text-block, .mobile-layout .story-media-container { opacity: 0; transition: opacity 1.2s cubic-bezier(0.165, 0.84, 0.44, 1), transform 1.2s cubic-bezier(0.165, 0.84, 0.44, 1); }
.text-block { transform: translateX(-40px); }
.mobile-layout .story-media-container { transform: translateX(40px) rotate(5deg); }
.story-card-mobile.is-visible .text-block, .story-card-mobile.is-visible .story-media-container { opacity: 1; transform: translateX(0) rotate(0); }
.story-card-mobile.is-visible .story-media-container { transition-delay: 0.2s; }
.card-content-wrapper { display: flex; flex-direction: column; gap: 30px; }
.mobile-layout .text-date { font-size: 14px; font-weight: 700; letter-spacing: 0.1em; margin-bottom: 15px; }
.story-card-mobile.is-visible .text-date { font-weight: 700; composes: animated-gradient-text; }
.mobile-layout .text-title { font-family: var(--font-title-mobile); font-size: 38px; line-height: 1.2; margin-bottom: 20px; color: var(--text-primary); }
.mobile-layout .text-content { font-size: 15px; line-height: 1.75; color: var(--text-secondary); text-align: justify; word-wrap: break-word; }

.mobile-layout .story-media-container { 
    aspect-ratio: 4 / 5;
    max-height: 70vh;
}

.mobile-layout .story-media-container img, .mobile-layout .story-media-container video { 
    width: 100%; height: 100%; 
    border-radius: 8px; 
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.5); 
}

/* --- 【关键修改】移除了这里的 text-align: center; --- */
.story-card-mobile.is-last { 
    /* text-align: center; <-- 已移除此行 */
}

.story-card-mobile.is-last .card-content-wrapper { 
    display: flex; /* 恢复为flex布局，与其他卡片保持一致 */
}
.story-card-mobile.is-last .story-media-container { 
    margin-top: 0; /* 恢复为0，由flex的gap属性统一控制间距 */
}

/* ================================================== */
/* ============= DESKTOP STYLES (> 900px) ============= */
/* ================================================== */
.desktop-active .container { max-width: 1400px; margin: 0 auto; padding: 0 50px; }
.desktop-active .header { padding: 8vh 0; }
.desktop-active .main-title { font-size: 5vw; }
.desktop-active .subtitle { font-size: 1.2vw; margin-top: 15px; }
.desktop-layout { display: grid; grid-template-columns: 1fr 1.5fr; gap: 100px; padding-bottom: 20vh; }
.left-panel { position: sticky; top: 20vh; height: 60vh; display: flex; flex-direction: column; }
.right-panel { min-height: 100vh; display: flex; flex-direction: column; gap: 30vh; }
.timeline-navigation { display: flex; flex-direction: column; gap: 15px; padding-bottom: 30px; border-bottom: 1px solid var(--border-color); }
.timeline-item { display: flex; align-items: center; gap: 20px; cursor: pointer; padding: 5px; border-radius: 8px; transition: background-color 0.3s ease; }
.timeline-item:hover { background-color: rgba(200, 205, 216, 0.05); }
.timeline-icon { width: 20px; height: 20px; border: 2px solid var(--text-secondary); border-radius: 50%; transition: all 0.4s ease; background-image: none; background-color: transparent; }
.timeline-title { font-size: 16px; color: var(--text-secondary); transition: all 0.4s ease; }
.timeline-item.active .timeline-icon { transform: scale(1.5); border-color: var(--accent-glow-border); box-shadow: 0 0 15px var(--accent-glow-shadow); background-image: radial-gradient(circle, var(--accent-glow-start) 0%, var(--accent-glow-end) 70%); }
.timeline-item.active .timeline-title { font-weight: 700; composes: animated-gradient-text; }
.desktop-layout .text-area { padding-top: 30px; flex-grow: 1; position: relative; overflow-y: auto; overflow-x: hidden; scrollbar-color: transparent transparent; transition: scrollbar-color 0.3s ease-out; }
.desktop-layout .text-area:hover { scrollbar-color: rgba(200, 205, 216, 0.5) transparent; }
.desktop-layout .text-area::-webkit-scrollbar { width: 10px; }
.desktop-layout .text-area::-webkit-scrollbar-track { background: transparent; }
.desktop-layout .text-area::-webkit-scrollbar-thumb { background-color: rgba(200, 205, 216, 0); border-radius: 10px; background-clip: content-box; border: 2px solid transparent; transition: background-color 0.3s ease-in-out; }
.desktop-layout .text-area:hover::-webkit-scrollbar-thumb { background-color: rgba(200, 205, 216, 0.5); }
.desktop-layout .text-area:hover::-webkit-scrollbar-thumb:hover { background-color: rgba(200, 205, 216, 0.8); }
.desktop-layout .text-area::before { content: attr(data-year); position: absolute; top: -50px; left: -20px; font-size: 200px; font-weight: 700; color: rgba(240, 242, 245, 0.04); z-index: -1; pointer-events: none; transition: content 0.5s ease; }
.desktop-layout .text-title { font-family: var(--font-title-desktop); font-size: 42px; }
.desktop-layout .text-date { margin: 10px 0 25px; font-size: 16px; font-weight: 700; composes: animated-gradient-text; }
.desktop-layout .text-content { font-size: 16px; line-height: 1.8; color: var(--text-secondary); padding-right: 15px; }
.desktop-layout .text-content p { margin-bottom: 1em; }

/* ===== 滑块与媒体样式 (通用) ===== */
.story-media-wrapper { 
    height: 60vh;
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 1s cubic-bezier(0.2, 0.8, 0.2, 1), transform 1s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.story-media-wrapper.is-visible { opacity: 1; transform: translateY(0); }
.story-media-container { 
    width: 100%; 
    height: 100%; 
    border-radius: 16px; 
    position: relative;
    background-color: #000;
}
.story-media-container.is-slider { overflow: hidden; }
.slider-wrapper { position: relative; width: 100%; height: 100%; }
.slider-item { position: absolute; top: 0; left: 0; width: 100%; height: 100%; opacity: 0; pointer-events: none; transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.23, 1, 0.32, 1); }
.slider-item.is-active { opacity: 1; pointer-events: auto; z-index: 1; }
.slider-item img, .slider-item video { width: 100%; height: 100%; }
.desktop-layout .slider-item img, .desktop-layout .slider-item video { border-radius: 16px; }

.desktop-active .story-media-container video,
.desktop-active .story-media-container img {
    object-fit: contain;
}
.mobile-active .story-media-container video,
.mobile-active .story-media-container img {
    object-fit: contain;
}

/* 视频播放覆盖层 */
.video-overlay {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.3); display: flex; align-items: center;
    justify-content: center; cursor: pointer; z-index: 5;
    opacity: 1; transition: opacity 0.4s ease;
}
.video-overlay.hidden { opacity: 0; pointer-events: none; }
.play-icon {
    width: 80px; height: 80px; background-color: rgba(255, 255, 255, 0.9);
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    box-shadow: 0 0 30px rgba(255, 255, 255, 0.5); transition: transform 0.3s ease;
}
.video-overlay:hover .play-icon { transform: scale(1.1); }
.play-icon svg { width: 40px; height: 40px; fill: var(--bg-dark); transform: translateX(3px); }

/* --- 视频控制栏和全屏按钮样式 --- */
.video-controls {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    padding: 0 15px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    background-image: linear-gradient(to top, rgba(0,0,0,0.5), transparent);
    z-index: 6;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    border-bottom-left-radius: 8px;
    border-bottom-right-radius: 8px;
}
.desktop-active .story-media-container.is-playing:hover .video-controls {
    opacity: 1;
    pointer-events: auto;
}
.mobile-active .story-media-container.is-playing .video-controls {
    opacity: 1;
    pointer-events: auto;
}
.fullscreen-btn {
    background: none; border: none; padding: 8px; cursor: pointer;
}
.fullscreen-btn svg {
    width: 24px; height: 24px; fill: #fff;
    filter: drop-shadow(0 1px 2px rgba(0,0,0,0.5));
}

/* --- 全屏状态下的样式 --- */
video:fullscreen,
video:-webkit-full-screen {
    object-fit: contain;
    width: 100%;
    height: 100%;
}
video:fullscreen ~ .video-controls,
video:-webkit-full-screen ~ .video-controls {
    display: none;
}


/* 滑块动画 */
.desktop-active .slider-item.anim-in-desktop { opacity: 1; }
.desktop-active .slider-item.anim-out-desktop { opacity: 0; }
.mobile-active .slider-item.anim-in-next { transform: translateX(40px) rotate(5deg); }
.mobile-active .slider-item.is-active { transform: translateX(0) rotate(0); }
.mobile-active .slider-item.anim-out-next { transform: translateX(-40px) rotate(-5deg); opacity: 0; }
.mobile-active .slider-item.anim-in-prev { transform: translateX(-40px) rotate(-5deg); }
.mobile-active .slider-item.anim-out-prev { transform: translateX(40px) rotate(5deg); opacity: 0; }

/* 滑块导航 */
.slider-nav { position: absolute; top: 50%; transform: translateY(-50%); width: 44px; height: 44px; background: rgba(0, 0, 0, 0.2); border-radius: 50%; display: flex; align-items: center; justify-content: center; cursor: pointer; z-index: 2; opacity: 0; transition: opacity 0.3s ease, background-color 0.3s ease; }
.story-media-container.is-slider:hover .slider-nav { opacity: 0.7; }
.slider-nav:hover { background: rgba(0, 0, 0, 0.5); opacity: 1; }
.slider-nav.next { right: 15px; }
.slider-nav svg { fill: var(--text-primary); width: 28px; height: 28px; }
.slider-pagination { position: absolute; bottom: 15px; left: 50%; transform: translateX(-50%); display: flex; gap: 8px; z-index: 2; }
.slider-pagination .dot { width: 8px; height: 8px; background: rgba(255, 255, 255, 0.4); border-radius: 50%; transition: background 0.3s ease; }
.slider-pagination .dot.active { background: rgba(255, 255, 255, 0.9); transform: scale(1.2); }