/* ToolsVault.io - Minimal Design System */
/* Color Scheme: Blue/Gray for Trust & Professionalism */

:root {
    --primary-blue: #1f3960;
    --primary-dark: #1e40af;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-900: #111827;
    --success: #10b981;
    --error: #ef4444;
    --white: #ffffff;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--gray-900);
    background: var(--gray-50);
}

/* Header */
header {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-blue);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-icon {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

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

/* Main Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 4rem 0;
    background: var(--white);
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 2.5rem;
    color: var(--gray-900);
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.25rem;
    color: var(--gray-600);
    margin-bottom: 2rem;
}

/* Tool Cards Grid */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.tool-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--gray-200);
    text-decoration: none;
    color: inherit;
    transition: all 0.3s;
}

.tool-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    border-color: var(--primary-blue);
}

.tool-card h3 {
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}

.tool-card p {
    color: var(--gray-600);
    font-size: 0.95rem;
}

/* Tool Page Layout */
.tool-container {
    max-width: 800px;
    margin: 0 auto;
}

.tool-header {
    text-align: center;
    margin-bottom: 2rem;
}

.tool-header h1 {
    font-size: 2rem;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
}

.tool-header p {
    color: var(--gray-600);
    font-size: 1.1rem;
}

/* Calculator/Converter Box */
.tool-box {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    margin-bottom: 2rem;
}

/* Form Elements */
.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--gray-700);
    font-weight: 500;
}

input[type="number"],
input[type="text"],
select,
.file-upload {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--gray-300);
    border-radius: 6px;
    font-size: 1rem;
    transition: all 0.2s;
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Buttons */
.btn {
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: var(--primary-blue);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
    background: var(--gray-200);
    color: var(--gray-700);
}

.btn-secondary:hover {
    background: var(--gray-300);
}

.btn-full {
    width: 100%;
}

/* Results Section */
.results {
    background: var(--gray-50);
    padding: 2rem;
    border-radius: 8px;
    margin-top: 2rem;
    border-left: 4px solid var(--primary-blue);
}

.results h3 {
    color: var(--gray-900);
    margin-bottom: 1rem;
}

.result-item {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--gray-200);
}

.result-item:last-child {
    border-bottom: none;
}

.result-label {
    color: var(--gray-700);
}

.result-value {
    font-weight: 600;
    color: var(--primary-blue);
    font-size: 1.1rem;
}

/* File Upload */
.file-upload-wrapper {
    border: 2px dashed var(--gray-300);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    transition: all 0.2s;
    cursor: pointer;
}

.file-upload-wrapper:hover {
    border-color: var(--primary-blue);
    background: var(--gray-50);
}

.file-upload-wrapper.dragover {
    border-color: var(--primary-blue);
    background: rgba(37, 99, 235, 0.05);
}

/* Footer */
footer {
    background: var(--gray-900);
    color: var(--white);
    padding: 3rem 0 1.5rem;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
    color: var(--white);
}

.footer-links {
    list-style: none;
}

.footer-links a {
    color: var(--gray-300);
    text-decoration: none;
    line-height: 2;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--primary-blue);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--gray-700);
    color: var(--gray-300);
}

/* AdSense Placeholders */
.ad-container {
    margin: 2rem 0;
    min-height: 250px;
    background: var(--gray-100);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-400);
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .nav-links {
        display: none;
    }
    
    .tool-box {
        padding: 1.5rem;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mt-2 {
    margin-top: 2rem;
}

.mb-2 {
    margin-bottom: 2rem;
}

.hidden {
    display: none;
}

/* Loading Spinner */
.spinner {
    border: 3px solid var(--gray-200);
    border-top: 3px solid var(--primary-blue);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 0.8s linear infinite;
    margin: 2rem auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}