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

:root {
    --primary-color: #4F46E5;
    --secondary-color: #10B981;
    --background-color: #F9FAFB;
    --card-background: #FFFFFF;
    --text-primary: #111827;
    --text-secondary: #6B7280;
    --border-color: #E5E7EB;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Tool Navigation Bar */
.tool-nav {
    background: white;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.tool-nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
}

.tool-nav-home {
    padding: 12px 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

.tool-nav-home:hover {
    color: #4338CA;
}

.tool-nav-links {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    align-items: center;
}

.tool-nav-links a {
    padding: 8px 16px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 6px;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.tool-nav-links a:hover {
    background-color: var(--background-color);
    color: var(--primary-color);
}

.tool-nav-links a.active {
    background-color: var(--primary-color);
    color: white;
}

/* Header */
header {
    background: linear-gradient(135deg, var(--primary-color) 0%, #7C3AED 100%);
    color: white;
    padding: 60px 20px;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

header h1 {
    font-size: 3rem;
    margin-bottom: 10px;
    font-weight: 700;
}

header .subtitle {
    font-size: 1.2rem;
    opacity: 0.95;
}

/* Main */
main {
    flex: 1;
    padding: 40px 20px;
}

/* Search Box */
.search-box {
    margin-bottom: 40px;
    display: flex;
    justify-content: center;
}

.search-box input {
    width: 100%;
    max-width: 600px;
    padding: 15px 20px;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background-color: var(--card-background);
    transition: all 0.3s ease;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* Tools Grid */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 40px;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

/* Tool Card */
.tool-card {
    background: var(--card-background);
    border-radius: 16px;
    padding: 30px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

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

.tool-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.tool-card h3 {
    font-size: 1.25rem;
    margin-bottom: 10px;
    color: var(--text-primary);
    font-weight: 600;
}

.tool-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 0.95rem;
    flex: 1;
}

.tool-link {
    display: inline-block;
    padding: 10px 24px;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.tool-link:hover {
    background-color: #4338CA;
    transform: scale(1.05);
}

/* Footer */
footer {
    background-color: var(--card-background);
    border-top: 1px solid var(--border-color);
    padding: 30px 20px;
    text-align: center;
    color: var(--text-secondary);
    margin-top: auto;
}

/* Responsive */
@media (max-width: 968px) {
    .tools-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .tool-nav-links a {
        font-size: 0.85rem;
        padding: 6px 12px;
    }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

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

    .tools-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .tool-card {
        padding: 24px;
    }

    .tool-nav-container {
        flex-direction: column;
        align-items: flex-start;
        padding: 10px 20px;
    }

    .tool-nav-links {
        width: 100%;
        justify-content: flex-start;
    }

    .tool-nav-links a {
        font-size: 0.8rem;
        padding: 6px 10px;
    }
}

@media (max-width: 580px) {
    .tools-grid {
        grid-template-columns: 1fr;
    }
}

/* Hidden class for search */
.hidden {
    display: none;
}