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

:root {
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --secondary-color: #764ba2;
    --text-primary: #2d3748;
    --text-secondary: #718096;
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --card-shadow-hover: 0 20px 40px rgba(0, 0, 0, 0.15);
    --border-radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-gradient);
    min-height: 100vh;
    padding: 40px 20px;
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

/* Header Styles */
.site-header {
    text-align: center;
    margin-bottom: 60px;
    color: white;
    position: relative;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    position: relative;
}

.site-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin: 0 auto;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    flex: 1;
    text-align: center;
}

/* Language Switcher */
.language-switcher {
    position: absolute;
    top: 0;
    right: 0;
}

.language-select {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    color: white;
    padding: 8px 12px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    outline: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='white' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
    padding-right: 32px;
}

.language-select:hover {
    background-color: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
}

.language-select:focus {
    background-color: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.6);
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.1);
}

.language-select option {
    background: var(--primary-color);
    color: white;
}

.site-description {
    font-size: 1.1rem;
    opacity: 0.8;
    max-width: 600px;
    margin: 0 auto;
}

/* Tools Grid */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

/* Tool Card */
.tool-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--bg-gradient);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--card-shadow-hover);
}

.tool-card:hover::before {
    transform: scaleX(1);
}

.tool-card.coming-soon {
    opacity: 0.7;
    cursor: not-allowed;
}

.tool-card.coming-soon:hover {
    transform: none;
}

/* Tool Icon */
.tool-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 20px;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    border-radius: 12px;
    transition: var(--transition);
}

.tool-card:hover .tool-icon {
    transform: scale(1.1) rotate(5deg);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.2) 0%, rgba(118, 75, 162, 0.2) 100%);
}

.tool-icon svg {
    width: 36px;
    height: 36px;
}

/* Tool Content */
.tool-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.tool-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.tool-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 15px;
    font-weight: 400;
}

.tool-description {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 20px;
    flex: 1;
}

/* Tool Link */
.tool-link {
    display: inline-flex;
    align-items: center;
    color: var(--primary-color);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    margin-top: auto;
}

.tool-link:hover {
    color: var(--primary-dark);
    transform: translateX(5px);
}

.tool-link.disabled {
    color: var(--text-secondary);
    cursor: not-allowed;
}

.tool-link.disabled:hover {
    transform: none;
}

/* Footer */
.site-footer {
    text-align: center;
    color: white;
    opacity: 0.8;
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.site-footer p {
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-top {
        flex-direction: column;
        align-items: center;
        gap: 15px;
    }

    .language-switcher {
        position: static;
        margin-top: 10px;
    }

    .site-title {
        font-size: 2.5rem;
    }

    .site-subtitle {
        font-size: 1.2rem;
    }

    .tools-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .tool-card {
        padding: 25px;
    }

    .tool-title {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    body {
        padding: 20px 15px;
    }

    .site-title {
        font-size: 2rem;
    }

    .site-subtitle {
        font-size: 1rem;
    }

    .site-description {
        font-size: 0.95rem;
    }

    .tool-card {
        padding: 20px;
    }
}

/* Animation */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tool-card {
    animation: fadeInUp 0.6s ease-out;
}

.tool-card:nth-child(1) {
    animation-delay: 0.1s;
}

.tool-card:nth-child(2) {
    animation-delay: 0.2s;
}

.tool-card:nth-child(3) {
    animation-delay: 0.3s;
}

.tool-card:nth-child(4) {
    animation-delay: 0.4s;
}