:root {
    --bg-primary: #0a0e14;
    --bg-secondary: #141922;
    --bg-card: #1a1f2e;
    --bg-card-hover: #232938;
    --text-primary: #e6e9f0;
    --text-secondary: #9ca3af;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --border: #2d3548;
    --shadow: rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
        sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background: linear-gradient(135deg, var(--bg-primary) 0%, #0f1419 100%);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 2rem 1rem;
}

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

header {
    text-align: center;
    margin-bottom: 3rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 4rem;
}

.tool-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    box-shadow: 0 4px 6px var(--shadow);
}

.tool-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 8px 12px var(--shadow);
}

.tool-card:focus {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.tool-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.tool-icon svg {
    width: 100%;
    height: 100%;
}

.tool-name {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
}

.tool-description {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
}

footer {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
}

footer p {
    margin: 0.5rem 0;
}

footer a {
    color: var(--accent);
    text-decoration: none;
}

footer a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

.auth-note {
    font-size: 0.875rem;
    font-style: italic;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    body {
        padding: 1rem 0.75rem;
    }

    h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

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

    .tool-card {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.75rem;
    }

    .tool-card {
        padding: 1.25rem;
    }
}