:root {
    --ink: #f8f4ea;
    --ink-dim: rgba(248, 244, 234, 0.78);
    --card: rgba(19, 28, 36, 0.68);
    --card-border: rgba(255, 255, 255, 0.24);
    --accent: #ffcc63;
    --shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    min-height: 100%;
    font-family: "Noto Serif SC", "Source Han Serif SC", "Microsoft YaHei", serif;
    color: var(--ink);
    scroll-behavior: smooth;
    scrollbar-gutter: stable;
}

body {
    position: relative;
    overflow-x: hidden;
    background: radial-gradient(circle at 20% 10%, #3f6f8f 0%, #203848 45%, #0f161d 100%);
}

.bg-layer,
.overlay {
    position: fixed;
    inset: 0;
    z-index: -2;
}

.bg-layer {
    background-image: url('./background.jpg');
    background-size: cover;
    background-position: center;
    filter: saturate(1.1);
    transform: scale(1.05);
}

.overlay {
    z-index: -1;
    background:
        radial-gradient(circle at 12% 20%, rgba(255, 192, 120, 0.20) 0%, transparent 34%),
        radial-gradient(circle at 85% 80%, rgba(96, 182, 211, 0.24) 0%, transparent 42%),
        linear-gradient(160deg, rgba(14, 20, 29, 0.76) 0%, rgba(14, 20, 29, 0.58) 40%, rgba(14, 20, 29, 0.78) 100%);
}

main {
    width: min(1100px, 92vw);
    margin: 0 auto;
}

/* Apply album-mode layout immediately to avoid first-frame size jump before album CSS loads */
body.album-mode {
    overflow: hidden;
}

html.album-mode body {
    overflow: hidden;
}

body.album-mode main {
    width: 100vw;
    max-width: none;
    margin: 0;
}

html.album-mode body main {
    width: 100vw;
    max-width: none;
    margin: 0;
}

body.album-mode .album-viewer {
    min-height: 100vh;
}

html.album-mode #hero,
html.album-mode #folders {
    display: none !important;
}

html.album-mode #albumViewer {
    display: block !important;
    min-height: 100vh;
}

/* Prevent first-paint flash of lightbox internals before album-template CSS is loaded */
html.album-mode #albumViewer .lightbox {
    display: none !important;
}

html.album-mode #albumViewer .lightbox.show {
    display: flex !important;
}

html.album-mode #albumViewer .viewer {
    opacity: 0;
    visibility: hidden;
}

html.album-mode #albumViewer .viewer.is-ready {
    opacity: 1;
    visibility: visible;
}

/* 下滑浮现效果：当用户向下滚动到文件夹时，文件夹区域整体向上浮现，卡片逐个延迟上浮 */
.hero {
    position: relative;
}

.folders {
    opacity: 0;
    transform: translateY(28px);
    transition: transform 560ms cubic-bezier(.2, .9, .3, 1), opacity 560ms;
    will-change: transform, opacity;
}

.folders.visible {
    opacity: 1;
    transform: translateY(0);
}

.folder-grid .folder-card {
    opacity: 0;
    transform: translateY(18px);
    transition: transform 480ms cubic-bezier(.2, .9, .3, 1), opacity 480ms;
}

.folders.visible .folder-grid .folder-card {
    opacity: 1;
    transform: translateY(0);
}

.hero {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 5rem 0 2rem;
}

.hero-content {
    width: 100%;
}

h1 {
    margin: 0;
    font-size: clamp(2rem, 4.5vw, 3.6rem);
    letter-spacing: 0.06em;
    text-shadow: 0 6px 20px rgba(0, 0, 0, 0.45);
}

.subtitle {
    margin: 0.8rem 0 2rem;
    font-size: 1rem;
    color: var(--ink-dim);
}

.pay-toggle {
    border: 1px solid rgba(255, 255, 255, 0.35);
    background: rgba(15, 24, 35, 0.68);
    color: var(--ink);
    border-radius: 999px;
    padding: 0.62rem 1.15rem;
    font-size: 0.96rem;
    cursor: pointer;
    transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}

.pay-toggle:hover {
    transform: translateY(-2px);
    background: rgba(15, 24, 35, 0.84);
    border-color: rgba(255, 221, 158, 0.82);
}

.pay-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(240px, 1fr));
    gap: 1.2rem;
    margin-top: 1.1rem;
    max-height: 1200px;
    opacity: 1;
    transform: translateY(0);
    overflow: hidden;
    transition: max-height 380ms ease, opacity 280ms ease, transform 320ms ease, margin-top 280ms ease;
}

.pay-grid.is-collapsed {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
}

.pay-card {
    background: var(--card);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    backdrop-filter: blur(8px);
    box-shadow: var(--shadow);
    padding: 1rem;
}

.pay-card h2 {
    margin: 0 0 0.9rem;
    font-size: 1.05rem;
    color: #fff0d0;
}

.pay-card img {
    width: 100%;
    max-height: 420px;
    object-fit: contain;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.95);
}

.scroll-tip {
    margin-top: 1.6rem;
    display: inline-block;
    text-decoration: none;
    color: #ffe3b0;
    font-size: 0.95rem;
    border-bottom: 1px dashed rgba(255, 227, 176, 0.72);
    padding-bottom: 0.2rem;
}

.folders {
    min-height: 100vh;
    padding: 5.5rem 0 4rem;
}

.section-header h2 {
    margin: 0;
    font-size: clamp(1.7rem, 3.2vw, 2.5rem);
}

.section-header p {
    margin: 0.7rem 0 2rem;
    color: var(--ink-dim);
}

.folder-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
}

.folder-card {
    text-decoration: none;
    color: var(--ink);
    background: rgba(8, 14, 20, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 16px;
    padding: 1rem 1.1rem;
    transition: transform 220ms ease, border-color 220ms ease, background 220ms ease;
}

.folder-card:hover {
    transform: translateY(-6px);
    border-color: rgba(255, 221, 158, 0.82);
    background: rgba(13, 21, 29, 0.8);
}

.folder-title {
    font-size: 1.08rem;
    margin: 0;
}

.folder-desc {
    margin: 0.45rem 0 0;
    color: var(--ink-dim);
    line-height: 1.45;
    font-size: 0.92rem;
}

.folder-tag {
    margin-top: 0.8rem;
    font-size: 0.8rem;
    color: var(--accent);
}

.site-footer {
    position: fixed;
    left: 50%;
    bottom: 10px;
    transform: translateX(-50%);
    z-index: 25;
    width: auto;
    max-width: min(92vw, 780px);
    margin: 0;
    padding: 0.75rem 1rem;
    border-radius: 12px;
    background: rgba(8, 14, 20, 0.36);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: var(--ink-dim);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.28rem;
    text-align: center;
    backdrop-filter: blur(6px);
}

.site-footer p {
    margin: 0;
    font-size: 0.86rem;
}

.footer-link {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.9rem;
    border-bottom: 1px solid transparent;
}

.footer-link:hover {
    border-bottom-color: rgba(255, 204, 99, 0.82);
}

@media (max-width: 800px) {
    .site-footer {
        max-width: min(92vw, 680px);
    }
}

.reveal {
    opacity: 0;
    transform: translateY(16px);
    animation: revealUp 650ms ease forwards;
}

.reveal:nth-child(2) {
    animation-delay: 180ms;
}

@keyframes revealUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 800px) {
    .hero {
        padding-top: 3.4rem;
    }

    .pay-grid {
        grid-template-columns: 1fr;
    }

    .pay-card img {
        max-height: 360px;
    }
}