:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --dark-bg: #0f0f23;
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 10px 25px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.3);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--dark-bg);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(245, 87, 108, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(79, 172, 254, 0.1) 0%, transparent 50%);
    z-index: -1;
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

.header {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeInDown 0.8s ease;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    font-weight: 400;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.tool-card {
    position: relative;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 2rem;
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    animation: fadeInUp 0.8s ease backwards;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    opacity: 0;
    transition: var(--transition);
    z-index: -1;
}

.tool-card:hover::before {
    opacity: 0.1;
}

.tool-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-lg);
    border-color: rgba(255, 255, 255, 0.2);
}

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

.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; }
.tool-card:nth-child(5) { animation-delay: 0.5s; }
.tool-card:nth-child(6) { animation-delay: 0.6s; }
.tool-card:nth-child(7) { animation-delay: 0.7s; }
.tool-card:nth-child(8) { animation-delay: 0.8s; }

.tool-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: inline-block;
    transition: var(--transition);
}

.tool-card:hover .tool-icon {
    transform: scale(1.2) rotate(5deg);
}

.tool-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    letter-spacing: -0.01em;
}

.tool-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1rem;
    line-height: 1.5;
}

.tool-arrow {
    position: absolute;
    bottom: 1.5rem;
    right: 1.5rem;
    font-size: 1.5rem;
    opacity: 0;
    transform: translateX(-10px);
    transition: var(--transition);
}

.tool-card:hover .tool-arrow {
    opacity: 1;
    transform: translateX(0);
}

.footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-top: 1px solid var(--card-border);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 1.5rem;
    }

    .header {
        margin-bottom: 2rem;
    }

    .tools-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .tool-card {
        padding: 1.5rem;
    }

    .tool-icon {
        font-size: 2.5rem;
    }

    .tool-title {
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 1rem;
    }

    .title {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 0.95rem;
    }

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

/* Dark mode enhancements */
@media (prefers-color-scheme: dark) {
    body {
        background: var(--dark-bg);
    }
}

/* Accessibility */
.tool-card:focus {
    outline: 2px solid rgba(102, 126, 234, 0.5);
    outline-offset: 4px;
}

.tool-card:focus:not(:focus-visible) {
    outline: none;
}

/* Print styles */
@media print {
    body::before {
        display: none;
    }

    .tool-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ccc;
    }
}