/* 编辑风温暖极简 — CSS Variables */
:root {
    --bg-color: #121212;
    --bg-warm: #1a1816;
    --primary-color: #e8e4e0;
    --text-secondary: #9e9892;
    --accent-color: #c1785c;
    --accent-muted: #a06550;
    --card-bg: #1e1c1a;
    --card-border: rgba(193, 120, 92, 0.15);
    --card-border-hover: rgba(193, 120, 92, 0.4);
    --transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);

    --image-width: 100%;
    --image-gap: 0.5rem;
    --column-count: 5;
    --column-gap: 1rem;
    --image-opacity: 0.4;
    --bg-rotate-degree: -15deg;
    --bg-blur-value: 1px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
    background-color: var(--bg-color);
    color: var(--primary-color);
    min-height: 100vh;
    line-height: 1.7;
    overflow-x: hidden;
    position: relative;
}

/* 噪点纹理 overlay */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 128px 128px;
}

.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    display: grid;
    grid-template-columns: repeat(var(--column-count), 1fr);
    gap: var(--column-gap);
    transform: rotate(var(--bg-rotate-degree)) scale(1.5);
    pointer-events: none;
    z-index: 0;
    transition: grid-template-columns 0.5s ease;
    filter: blur(var(--bg-blur-value)) brightness(0.5);
}

.waterfall-column {
    position: relative;
    overflow: hidden;
}

.column-wrapper {
    position: absolute;
    left: 0;
    width: 100%;
    display: flex;
    flex-direction: column;
    will-change: transform;
}

.waterfall-column img {
    width: var(--image-width);
    height: auto;
    border-radius: 0.25rem;
    opacity: var(--image-opacity);
    transition: opacity 0.3s ease;
    margin: 0 auto;
    margin-bottom: var(--image-gap);
    display: block;
    filter: grayscale(40%) sepia(10%);
}

.container {
    max-width: 75rem;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
}

header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    margin-bottom: 2rem;
    border-bottom: 1px solid rgba(232, 228, 224, 0.08);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--primary-color);
    text-decoration: none;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.logo i {
    color: var(--accent-color);
    font-size: 1.6rem;
    opacity: 0.8;
}

.greeting {
    text-align: center;
    max-width: 800px;
    margin: 4rem 0 5rem;
    padding: 0 1rem;
}

.greeting h1 {
    font-family: Georgia, 'STSong', 'SimSun', serif;
    font-size: clamp(2.8rem, 6vw, 4.5rem);
    margin-bottom: 1rem;
    font-weight: 400;
    line-height: 1.15;
    color: var(--primary-color);
    letter-spacing: -0.02em;
}

.greeting .subtitle {
    font-size: clamp(1.1rem, 2vw, 1.35rem);
    color: var(--text-secondary);
    line-height: 1.8;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 300;
}

.highlight {
    color: var(--accent-color);
    font-weight: 500;
}

/* 卡片区域 */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    width: 100%;
    max-width: 1000px;
    margin-top: 1rem;
}

.card {
    background: var(--card-bg);
    border-radius: 6px;
    padding: 2.5rem;
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
    border: 1px solid var(--card-border);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--accent-color);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.card:hover {
    transform: translateY(-4px);
    border-color: var(--card-border-hover);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.card:hover::after {
    transform: scaleX(1);
}

.card-main {
    flex-grow: 1;
}

.card-icon {
    font-size: 1.8rem;
    color: var(--accent-color);
    margin-bottom: 1.5rem;
    opacity: 0.7;
    transition: opacity 0.3s ease;
}

.card:hover .card-icon {
    opacity: 1;
}

.card h3 {
    font-family: Georgia, 'STSong', 'SimSun', serif;
    font-size: 1.6rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.card p {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.card-footer {
    display: flex;
    align-items: center;
    color: var(--accent-color);
    font-weight: 500;
    font-size: 0.95rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.arrow {
    margin-left: 8px;
    transition: transform 0.3s ease;
    opacity: 0.6;
}

.card:hover .arrow {
    transform: translateX(6px);
    opacity: 1;
}

/* Footer */
.site-footer {
    margin-top: 6rem;
    text-align: center;
    z-index: 1;
    position: relative;
}

.site-footer p {
    color: var(--text-secondary);
    font-size: 0.8rem;
    opacity: 0.6;
    line-height: 2;
}

.site-footer a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.site-footer a:hover {
    color: var(--accent-color);
}

.site-footer .divider {
    margin: 0 0.75rem;
    opacity: 0.3;
}

/* 控制面板 */
.controls {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: rgba(26, 24, 22, 0.92);
    padding: 20px;
    border-radius: 8px;
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: 12px;
    width: 300px;
    border: 1px solid rgba(193, 120, 92, 0.1);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.control-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 5px;
    padding-bottom: 10px;
    border-bottom: 1px solid rgba(232, 228, 224, 0.08);
}

.control-title {
    font-weight: 500;
    font-size: 1rem;
    color: var(--accent-color);
    letter-spacing: 0.05em;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.toggle-btn {
    background: rgba(232, 228, 224, 0.06);
    border: none;
    color: var(--primary-color);
    width: 30px;
    height: 30px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    position: relative;
}

.toggle-btn:hover {
    background: rgba(193, 120, 92, 0.2);
    transform: rotate(90deg);
}

.control-content {
    display: flex;
    flex-direction: column;
    gap: 15px;
    opacity: 1;
    max-height: 500px;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    padding-bottom: 8px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.control-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.control-label span:first-child {
    font-weight: 400;
}

.control-label span:last-child {
    color: var(--accent-color);
    font-weight: 500;
    font-size: 0.85rem;
}

input[type="range"] {
    width: 100%;
    height: 4px;
    border-radius: 2px;
    background: rgba(232, 228, 224, 0.1);
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    opacity: 0.8;
    transition: opacity 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    opacity: 1;
}

/* 最小化状态 */
.controls.minimized {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: 50%;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(193, 120, 92, 0.15);
    border: 1px solid rgba(193, 120, 92, 0.3);
}

.controls.minimized .control-content {
    opacity: 0;
    max-height: 0;
    margin-top: -10px;
}

.controls.minimized .control-header {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    border: none;
    justify-content: center;
    align-items: center;
}

.controls.minimized .control-title {
    opacity: 0;
    transform: scale(0);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.controls.minimized .toggle-btn {
    transform: rotate(0deg);
    width: 100%;
    height: 100%;
    font-size: 1.8rem;
    background: transparent;
    border-radius: 50%;
    position: absolute;
    top: 0;
    left: 0;
}

.controls.minimized .toggle-btn::before,
.controls.minimized .toggle-btn::after {
    content: '';
    position: absolute;
    background: var(--primary-color);
    transition: all 0.3s ease;
}

.controls.minimized .toggle-btn::before {
    width: 18px;
    height: 3px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 1px;
}

.controls.minimized .toggle-btn::after {
    width: 3px;
    height: 18px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 1px;
}

.controls:not(.minimized) .toggle-btn::before {
    content: '';
    position: absolute;
    width: 18px;
    height: 3px;
    background: var(--primary-color);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 1px;
}

.controls:not(.minimized) .toggle-btn::after {
    display: none;
}

.controls.minimized .toggle-btn:hover {
    background: rgba(232, 228, 224, 0.06);
    transform: rotate(90deg);
}

.controls.minimized .toggle-btn:hover::before,
.controls.minimized .toggle-btn:hover::after {
    background: var(--accent-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .background {
        gap: 1rem;
        transform: rotate(-15deg) scale(1.8);
    }

    header {
        flex-direction: column;
        gap: 1.5rem;
        padding-bottom: 2rem;
    }

    .greeting {
        margin: 3rem 0 4rem;
    }

    .card {
        padding: 2rem;
    }

    .controls {
        bottom: 20px;
        right: 20px;
        width: 260px;
    }
}

@media (max-width: 480px) {
    .cards {
        grid-template-columns: 1fr;
    }

    .card {
        padding: 1.8rem;
    }

    .site-footer p {
        font-size: 0.75rem;
    }
}