:root {
    --primary-color: #4F46E5;
    --primary-light: #818CF8;
    --primary-dark: #3730A3;
    --secondary-color: #06B6D4;
    --background-color: #F9FAFB;
    --card-background: #ffffff;
    --text-color: #111827;
    --text-secondary: #4B5563;
    --text-light: #6B7280;
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.025);
    --hover-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.02);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --card-border-radius: 16px;
    --gradient-bg: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1300px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

header {
    text-align: center;
    margin-bottom: 4rem;
    animation: fadeIn 1s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

header h1 {
    font-size: 3.2rem;
    font-weight: 800;
    background: var(--gradient-bg);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 0.8rem;
    letter-spacing: -0.025em;
    line-height: 1.1;
    padding-bottom: 0.2rem;
}

header p {
    font-size: 1.3rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    font-weight: 400;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2.5rem;
    opacity: 0;
    transition: opacity 0.5s ease-in;
}

.tools-grid.visible {
    opacity: 1;
    animation: staggerCards 0.6s ease-out forwards;
}

@keyframes staggerCards {
    from { transform: translateY(20px); }
    to { transform: translateY(0); }
}

.tool-card {
    background-color: var(--card-background);
    border-radius: var(--card-border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    border: 1px solid rgba(0, 0, 0, 0.03);
    height: 100%;
    position: relative;
    isolation: isolate;
}

.tool-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--hover-shadow);
    border-color: rgba(79, 70, 229, 0.1);
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-bg);
    z-index: 1;
    transition: var(--transition);
    opacity: 0.85;
}

.tool-card:hover::before {
    height: 6px;
}

.tool-card-header {
    padding: 2rem 2rem 1.2rem;
    display: flex;
    align-items: center;
    gap: 1.2rem;
}

.tool-icon-container, .tool-icon-placeholder {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    overflow: hidden;
    background-color: #f3f4f6;
    position: relative;
    flex-shrink: 0;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.08);
}

.tool-icon {
    width: 32px;
    height: 32px;
    object-fit: contain;
    filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.1));
}

.tool-icon-spinner {
    width: 24px;
    height: 24px;
    border: 2px solid rgba(79, 70, 229, 0.2);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.tool-icon.fallback {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-bg);
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    border-radius: 12px;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.tool-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    position: relative;
}

.tool-card-body {
    padding: 0 2rem 2rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.tool-description {
    margin-bottom: 1.8rem;
    color: var(--text-secondary);
    font-size: 1.05rem;
    flex-grow: 1;
    line-height: 1.6;
}

.tool-url {
    display: inline-block;
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 1.8rem;
    word-break: break-all;
    font-family: 'Roboto Mono', 'SF Mono', monospace;
    background-color: #f3f4f6;
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
}

.tool-actions {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    margin-top: auto;
}

.visit-btn {
    padding: 0.9rem 2rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    font-size: 1rem;
    position: relative;
    overflow: hidden;
}

.visit-btn::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.1);
    opacity: 0;
    transition: var(--transition);
}

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

.visit-btn:hover::after {
    opacity: 1;
}

footer {
    text-align: center;
    padding: 3rem 0 2rem;
    color: var(--text-light);
    font-size: 0.95rem;
}

/* Loading Screen Styles */
.loading-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    width: 100%;
    margin: 2rem 0;
    transition: opacity 0.5s ease-out;
}

.loading-screen.hidden {
    opacity: 0;
    pointer-events: none;
    position: absolute;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(79, 70, 229, 0.1);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
    margin-bottom: 1.5rem;
}

.loading-screen p {
    font-size: 1.2rem;
    color: var(--primary-color);
    font-weight: 600;
    letter-spacing: 0.01em;
}

/* Error message styling */
.error-message {
    text-align: center;
    padding: 3rem;
    background-color: #FEF2F2;
    border-radius: 12px;
    color: #B91C1C;
}

.error-message p {
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
}

.error-message button {
    padding: 0.8rem 1.5rem;
    background-color: #B91C1C;
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.error-message button:hover {
    background-color: #991B1B;
}

@media (max-width: 768px) {
    .container {
        padding: 2rem 1.5rem;
    }
    
    header {
        margin-bottom: 3rem;
    }
    
    header h1 {
        font-size: 2.6rem;
    }
    
    header p {
        font-size: 1.1rem;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
        gap: 1.8rem;
    }
    
    .tool-card-header {
        padding: 1.8rem 1.8rem 1rem;
    }
    
    .tool-card-body {
        padding: 0 1.8rem 1.8rem;
    }
}