/* =================================== 
   Engineering Tools Pro - Professional Design System
   Theme: Modern Professional (Slate/Blue/Teal)
   =================================== */

:root {
    /* Color Palette */
    --primary-color: #2563eb;
    /* Blue 600 */
    --primary-dark: #1d4ed8;
    /* Blue 700 */
    --secondary-color: #0f172a;
    /* Slate 900 */
    --accent-color: #14b8a6;
    /* Teal 500 */

    /* Backgrounds */
    --bg-body: #f8fafc;
    /* Slate 50 */
    --bg-card: #ffffff;
    --bg-subtle: #f1f5f9;
    /* Slate 100 */

    /* Text */
    --text-main: #1e293b;
    /* Slate 800 */
    --text-muted: #64748b;
    /* Slate 500 */
    --text-light: #94a3b8;
    /* Slate 400 */

    /* Effects */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-glow: 0 0 15px rgba(37, 99, 235, 0.2);
}

/* Base Styles */
body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    color: var(--secondary-color);
    font-weight: 700;
    letter-spacing: -0.025em;
}

/* Glass Card Effect */
.glass-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-md);
    transition: transform 0.2s, box-shadow 0.2s;
}

.glass-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Utilities */
.text-gradient {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.btn-primary {
    background: linear-gradient(to right, var(--primary-color), var(--primary-dark));
    color: white;
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s;
}

.btn-primary:hover {
    box-shadow: var(--shadow-glow);
    transform: translateY(-1px);
}

/* Form Elements */
input,
select,
textarea {
    border: 1px solid #e2e8f0;
    /* Slate 200 */
    border-radius: 0.5rem;
    padding: 0.75rem;
    width: 100%;
    transition: border-color 0.2s, box-shadow 0.2s;
}

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

/* Footer Links */
.footer-link {
    color: var(--text-muted);
    transition: color 0.2s;
}

.footer-link:hover {
    color: var(--primary-color);
}

/* Tool Grid Animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tool-card {
    animation: fadeIn 0.5s ease-out forwards;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-body);
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}