:root {
    --primary-color: #E6B800;  /* 降低饱和度的奶酪黄 */
    --secondary-color: #CC8400; /* 降低饱和度的奶酪橙 */
    --accent-color: #FFF8E6;   /* 更柔和的奶酪白 */
    --background-color: #F8F4E1; /* 更浅的米色背景 */
    --text-color: #443322;     /* 更深的棕色文字 */
    --card-bg: #ffffff;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', system-ui, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    background-color: var(--primary-color);
    color: var(--text-color);
    padding: 3rem 2rem;
    text-align: center;
    box-shadow: var(--shadow);
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.search-box {
    max-width: 600px;
    margin: 1.5rem auto 0;
    display: flex;
    gap: 0.5rem;
}

.search-input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 2px solid var(--primary-color);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(230, 184, 0, 0.2);
}

.search-btn {
    padding: 0.75rem 1.5rem;
    background-color: var(--primary-color);
    color: var(--text-color);
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
}

.search-btn:hover {
    background-color: #FFB300;
    transform: translateY(-2px);
}

.header-subtitle {
    font-size: 1.1rem;
    font-weight: 400;
    opacity: 0.9;
    margin-top: 0.5rem;
}

main {
    flex: 1;
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    background: var(--background-color);
    position: relative;
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    padding: 1rem;
}

.tool-card {
    position: relative;
    background: rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    overflow: hidden;
    height: 180px;
    isolation: isolate;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: inherit;
    backdrop-filter: blur(10px);
    z-index: -1;
    border-radius: var(--radius);
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.tool-card a {
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: 1.5rem;
}

.tool-card h2 {
    margin: 0 0 1rem;
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: 600;
    text-shadow: 
        -1px -1px 0 #000,
        1px -1px 0 #000,
        -1px 1px 0 #000,
        1px 1px 0 #000;
}

.tool-card p {
    color: #654321; /* 深褐色 */
    font-size: 14px;
    line-height: 1.5;
    margin: 8px 0 0;
}

.tool-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

footer {
    text-align: center;
    padding: 2rem 1.5rem;
    background-color: var(--primary-color);
    color: var(--text-color);
    margin-top: auto;
    box-shadow: var(--shadow);
}

footer p {
    margin: 0.5rem 0;
}

.footer-links {
    margin-top: 1rem;
}

.footer-links .btn {
    margin: 0 0.5rem;
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.footer-links .btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

/* Material Icons */
.material-icons {
    font-size: 48px;
    width: 48px;
    height: 48px;
    display: inline-block;
    vertical-align: middle;
}

.tool-icon {
    color: var(--primary-color);
    margin-bottom: 1rem;
    transition: var(--transition);
}

.tool-card:hover .tool-icon {
    color: var(--secondary-color);
    transform: scale(1.1);
}

/* Utility Classes */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    background-color: var(--primary-color);
    color: var(--text-color);
    text-decoration: none;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
        text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
    }
    
    .tool-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    .tool-card h2 {
        font-size: 1.2rem;
    }

    .tool-card p {
        font-size: 12px;
    }
}


@media (min-width: 952px) {
    header h1 {
        font-size: 2rem;
        text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
    }
    
    .tool-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 1rem;
    }

}