body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #f2f4f6;
    font-family: 'Noto Serif SC', serif;
    color: #1d1d1f;
    height: 100vh;
    width: 100vw;
}

:root {
    --bg-blur: 12px;
    --ink-strong: #111117;
}

#canvas-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 4;
}

.bg-blur-overlay {
    position: fixed;
    inset: 0;
    z-index: 2;
    pointer-events: none;
    backdrop-filter: blur(var(--bg-blur));
    -webkit-backdrop-filter: blur(var(--bg-blur));
    transition: backdrop-filter 1.2s cubic-bezier(0.19, 1, 0.22, 1);
}

/* Noise Overlay */
.noise-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 5;
    opacity: 0.05;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

.ui-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 6;
    pointer-events: none;
}

.top-nav {
    position: absolute;
    top: 3rem;
    left: 3rem;
    pointer-events: auto;
    z-index: 10;
}

.back-btn {
    text-decoration: none;
    color: #1d1d1f;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 0.75rem;
    letter-spacing: 3px;
    font-weight: 300;
    opacity: 0.5;
    transition: all 0.5s cubic-bezier(0.19, 1, 0.22, 1);
    mix-blend-mode: difference;
}

.back-btn:hover {
    opacity: 1;
    transform: translateX(-5px);
}

.info-cluster {
    position: absolute;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.info-item {
    position: absolute;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    opacity: 0;
    filter: blur(10px);
    transform: translateY(10px) scale(0.985);
    animation: blurHold 2.4s cubic-bezier(0.19, 1, 0.22, 1) forwards;
    cursor: pointer;
    transition: filter 1.5s cubic-bezier(0.19, 1, 0.22, 1), opacity 1s cubic-bezier(0.19, 1, 0.22, 1), transform 0.8s cubic-bezier(0.19, 1, 0.22, 1);
    pointer-events: auto;
    will-change: filter, opacity, transform;
}

.info-item,
.info-item * {
    user-select: none;
    -webkit-user-select: none;
}

.info-item:nth-child(1) {
    animation-delay: 0.4s;
}

.info-item:nth-child(2) {
    animation-delay: 0.7s;
}

.info-item:nth-child(3) {
    animation-delay: 1s;
}

.info-item:nth-child(4) {
    animation-delay: 1.3s;
}

@keyframes blurHold {
    from {
        opacity: 0;
        filter: blur(14px);
        transform: translateY(24px) scale(0.96);
    }

    to {
        opacity: 1;
        filter: blur(10px);
        transform: translateY(0) scale(1);
    }
}

.info-item.revealed {
    filter: blur(0);
    opacity: 1;
    animation: none;
    transform: translateY(0);
}

/* Minimalist annotation-style label */
.info-item .label {
    font-size: 0.55rem;
    letter-spacing: 6px;
    color: rgba(18, 18, 22, 0.82);
    margin-bottom: 0.6rem;
    text-transform: uppercase;
    font-weight: 200;
    position: relative;
    transition: all 0.4s ease;
}

/* Subtle dot instead of line */
.info-item .label::before {
    content: '';
    position: absolute;
    left: -12px;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background-color: #0f1013;
    opacity: 0.55;
    transition: all 0.4s ease;
}

/* Refined typography - rhythm through size variation */
.info-item .value {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.4rem;
    font-weight: 500;
    color: #040508;
    letter-spacing: 1px;
    transition: all 0.6s cubic-bezier(0.19, 1, 0.22, 1);
    text-shadow: 0 10px 36px rgba(12, 13, 16, 0.22);
    opacity: 1;
}

/* Create visual rhythm through varied sizes */
.info-item:nth-child(1) .value {
    font-size: 1.5rem;
    font-weight: 250;
}

.info-item:nth-child(2) .value {
    font-size: 1.3rem;
}

.info-item:nth-child(3) .value {
    font-size: 1.6rem;
    font-weight: 250;
}

.info-item:nth-child(4) .value {
    font-size: 1.2rem;
}

/* Hover: subtle letter-spacing spread */
.info-item.revealed:hover {
    transform: none;
    filter: blur(0);
}

.info-item.revealed:hover .value {
    letter-spacing: 1px;
    opacity: 1;
    color: #040508;
    text-shadow: 0 10px 36px rgba(12, 13, 16, 0.22);
}

.info-item.revealed:hover .label {
    opacity: 0.7;
    color: rgba(18, 18, 22, 0.72);
}

.info-item.revealed:hover .label::before {
    opacity: 0.45;
    transform: translateY(-50%) scale(1.1);
}

/* Subtle hover aura without moving text */
.info-item .value {
    position: relative;
    display: inline-block;
}

.info-item.revealed .value::after {
    content: '';
    position: absolute;
    left: -2px;
    right: -2px;
    bottom: -6px;
    height: 1px;
    background: #000;
    opacity: 0;
    transition: opacity 0.38s cubic-bezier(0.22, 1, 0.36, 1), transform 0.38s cubic-bezier(0.22, 1, 0.36, 1);
    transform: scaleX(0);
    transform-origin: center;
    pointer-events: none;
    z-index: 0;
    will-change: transform, opacity;
}

.info-item.revealed:hover .value::after {
    opacity: 1;
    transform: scaleX(1);
}

/* Avoid flicker when blurred: lock hover visuals before reveal */
.info-item:not(.revealed):hover,
.info-item:not(.revealed):focus-visible {
    transform: translateY(10px) scale(0.985);
    filter: blur(10px);
}

.info-item:not(.revealed):hover .value,
.info-item:not(.revealed):focus-visible .value {
    letter-spacing: 1px;
    opacity: 1;
}

.info-item:not(.revealed):hover .label,
.info-item:not(.revealed):focus-visible .label {
    opacity: 1;
    color: rgba(18, 18, 22, 0.82);
}

.info-item:not(.revealed):hover .label::before,
.info-item:not(.revealed):focus-visible .label::before {
    opacity: 0.55;
    transform: translateY(-50%) scale(1);
}

/* Detail Overlay */
.detail-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 100;
    background: rgba(242, 244, 246, 0.85);
    backdrop-filter: blur(25px) saturate(100%);
    -webkit-backdrop-filter: blur(25px) saturate(100%);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.6s cubic-bezier(0.19, 1, 0.22, 1);
    user-select: none;
    -webkit-user-select: none;
}

.detail-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.detail-content {
    max-width: 550px;
    width: 80%;
    padding: 4rem;
    background: transparent;
    box-shadow: none;
    transform: translateY(30px);
    transition: transform 0.8s cubic-bezier(0.19, 1, 0.22, 1);
    text-align: center;
    position: relative;
    border: none;
    user-select: none;
    -webkit-user-select: none;
}

.detail-overlay.active .detail-content {
    transform: translateY(0);
}

.detail-content h2 {
    font-family: 'Noto Serif SC', serif;
    font-size: 2.2rem;
    font-weight: 300;
    margin-bottom: 1.5rem;
    letter-spacing: 4px;
    color: #1d1d1f;
}

.detail-content p {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.05rem;
    line-height: 2;
    color: #4a4a4a;
    margin-bottom: 2rem;
    font-weight: 300;
    /* 防止中文词组被分割 */
    word-break: keep-all;
    white-space: pre-wrap;
    overflow-wrap: break-word;
}

.detail-content ul,
.detail-content ol {
    font-family: 'Noto Serif SC', serif;
    font-size: 1.05rem;
    line-height: 2;
    color: #4a4a4a;
    font-weight: 300;
    padding-left: 1.5rem;
    margin: 1rem 0 2rem 0;
}

.detail-content ol li {
    margin-bottom: 0.5rem;
}

.detail-content hr {
    border: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.2), transparent);
    width: 100px;
    margin: 2.5rem auto;
}

.close-btn {
    position: absolute;
    top: 3rem;
    right: 3rem;
    background: none;
    border: none;
    color: #1d1d1f;
    cursor: pointer;
    opacity: 0.4;
    transition: all 0.4s ease;
    z-index: 101;
    padding: 10px;
}

.close-btn svg {
    width: 32px;
    height: 32px;
}

.close-btn:hover {
    opacity: 1;
    transform: rotate(90deg) scale(1.1);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .top-nav {
        top: 2rem;
        left: 2rem;
    }

    .info-item .value {
        font-size: 1.1rem !important;
    }

    .info-item .label {
        font-size: 0.35rem;
    }

    .detail-content {
        padding: 2rem;
        width: 90%;
    }

    .detail-content h2 {
        font-size: 1.5rem;
    }
}