/* Resources Page - Tech Dark Theme */

.page-header {
    text-align: center;
    padding: 60px 20px 40px;
    background: linear-gradient(135deg, #1f2937 0%, #111827 50%, #0f172a 100%);
    color: white;
}

.page-header h1 {
    font-size: 44px;
    margin-bottom: 15px;
}

.page-header p {
    font-size: 18px;
    opacity: 0.9;
}

/* Search Section */
.search-section {
    padding: 40px 20px;
    background: #f9fafb;
}

.search-input {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    display: block;
    padding: 18px 20px;
    border: 2px solid #e5e7eb;
    border-radius: 50px;
    font-size: 16px;
    background: white;
    transition: var(--transition);
    font-weight: 500;
}

.search-input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

/* Resources Container */
.resources-container {
    padding: 60px 20px;
}

/* Resource Category */
.resource-category {
    margin-bottom: 80px;
    background: white;
    padding: 40px;
    border-radius: 12px;
    border-left: 5px solid #667eea;
}

.resource-category.special-resource {
    background: linear-gradient(135deg, #667eea15 0%, #764ba215 100%);
    border-left-color: #764ba2;
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid #e5e7eb;
}

.category-header h2 {
    margin: 0;
    color: #1f2937;
    font-size: 28px;
}

.resource-count {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
}

/* Formulas Grid */
.formulas-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.formula-card {
    background: linear-gradient(135deg, #f0f4ff 0%, #f5f3ff 100%);
    padding: 25px;
    border-radius: 10px;
    border: 2px solid #e0e7ff;
    transition: var(--transition);
    text-align: center;
}

.formula-card:hover {
    transform: translateY(-5px);
    border-color: #667eea;
    box-shadow: 0 15px 35px rgba(102, 126, 234, 0.15);
}

.formula-card h4 {
    color: #1f2937;
    margin-bottom: 15px;
    font-size: 18px;
}

.formula-box {
    background: white;
    padding: 20px;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 16px;
    font-weight: 600;
    color: #667eea;
    margin-bottom: 15px;
    border-left: 4px solid #667eea;
}

.formula-use {
    color: #6b7280;
    font-size: 14px;
}

/* Definitions List */
.definitions-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
}

.definition-item {
    background: linear-gradient(135deg, #fff5e6 0%, #fff8f0 100%);
    padding: 25px;
    border-radius: 10px;
    border-left: 4px solid #f59e0b;
    transition: var(--transition);
}

.definition-item:hover {
    transform: translateX(5px);
    box-shadow: 0 10px 25px rgba(245, 158, 11, 0.15);
}

.definition-item h4 {
    color: #1f2937;
    margin-bottom: 12px;
    font-size: 18px;
}

.definition-item p {
    color: #4b5563;
    line-height: 1.8;
    font-size: 15px;
}

/* Tools Grid */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 25px;
}

.tool-card {
    background: linear-gradient(135deg, #f0fdf4 0%, #f1fce4 100%);
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    border: 2px solid #dcfce7;
    transition: var(--transition);
}

.tool-card:hover {
    transform: scale(1.05);
    border-color: #10b981;
    box-shadow: 0 15px 35px rgba(16, 185, 129, 0.15);
}

.tool-icon {
    font-size: 40px;
    margin-bottom: 15px;
}

.tool-card h4 {
    color: #1f2937;
    margin-bottom: 10px;
    font-size: 18px;
}

.tool-card p {
    color: #4b5563;
    font-size: 14px;
    line-height: 1.6;
}

/* Websites Grid */
.websites-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.website-card {
    background: linear-gradient(135deg, #fef3c7 0%, #fef9e7 100%);
    padding: 30px;
    border-radius: 10px;
    border: 2px solid #fde68a;
    transition: var(--transition);
}

.website-card:hover {
    transform: translateY(-8px);
    border-color: #f59e0b;
    box-shadow: 0 15px 35px rgba(245, 158, 11, 0.2);
}

.website-card h4 {
    color: #1f2937;
    margin-bottom: 10px;
    font-size: 20px;
}

.website-card p {
    color: #4b5563;
    margin-bottom: 20px;
    font-size: 14px;
    line-height: 1.6;
}

.btn-visit {
    display: inline-block;
    color: #f59e0b;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.btn-visit:hover {
    color: #d97706;
    margin-right: 5px;
}

/* Periodic Table */
.periodic-preview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 12px;
}

.element {
    background: linear-gradient(135deg, #dbeafe 0%, #e0e7ff 100%);
    padding: 15px;
    border-radius: 8px;
    text-align: center;
    border: 2px solid #93c5fd;
    transition: var(--transition);
}

.element:hover {
    transform: scale(1.1);
    box-shadow: 0 10px 20px rgba(59, 130, 246, 0.3);
}

.element-num {
    font-size: 12px;
    color: #3b82f6;
    font-weight: 600;
}

.element-symbol {
    font-size: 28px;
    font-weight: 700;
    color: #1e40af;
    margin: 5px 0;
}

.element-name {
    font-size: 11px;
    color: #475569;
}

.element-mass {
    font-size: 10px;
    color: #94a3b8;
    margin-top: 5px;
}

/* Responsive */
@media (max-width: 768px) {
    .page-header h1 {
        font-size: 32px;
    }

    .resource-category {
        padding: 30px 15px;
    }

    .category-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }

    .formulas-grid,
    .definitions-list,
    .tools-grid,
    .websites-grid {
        grid-template-columns: 1fr;
    }

    .periodic-preview {
        grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    }
}

@media (max-width: 480px) {
    .page-header h1 {
        font-size: 24px;
    }

    .resource-category {
        padding: 20px 15px;
        margin-bottom: 40px;
    }

    .category-header h2 {
        font-size: 20px;
    }

    .resource-count {
        font-size: 11px;
        padding: 4px 12px;
    }

    .formula-card,
    .definition-item,
    .tool-card,
    .website-card {
        padding: 15px;
    }

    .formula-card h4,
    .definition-item h4,
    .tool-card h4,
    .website-card h4 {
        font-size: 16px;
    }

    .periodic-preview {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }

    .element {
        padding: 10px;
    }

    .element-symbol {
        font-size: 20px;
    }
}