/* 
 * Core Stylesheet
 * Mobile-first architecture, vertical layouts, and strictly local assets (Zero CDNs)
 */

:root {
    /* Brand Colors */
    --primary-brand: #0f172a;
    --accent-blue: #2563eb;
    --accent-hover: #1d4ed8;
    
    /* Surface & Text */
    --bg-canvas: #f8fafc;
    --bg-surface: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-light: #e2e8f0;
    
    /* UI Specifications */
    --card-radius: 18px; 
    --btn-radius: 16px;
    --input-radius: 16px;
    --soft-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
    --transition-speed: 0.25s ease-in-out;
}

/* Local Font Initialization */
@font-face {
    font-family: 'AppFont';
    src: url('../fonts/inter-regular.woff2') format('woff2');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'AppFont';
    src: url('../fonts/inter-semibold.woff2') format('woff2');
    font-weight: 600;
    font-style: normal;
    font-display: swap;
}

/* Base Reset & Typography */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'AppFont', sans-serif;
    background-color: var(--bg-canvas);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Layout Hierarchy (Mobile-First Vertical Stacking) */
.container {
    width: 100%;
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-group, .service-block {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 100%;
}

/* Core UI Elements */
.card {
    background-color: var(--bg-surface);
    border-radius: var(--card-radius);
    padding: 24px;
    box-shadow: var(--soft-shadow);
    border: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.btn-primary {
    background-color: var(--accent-blue);
    color: #ffffff;
    border: none;
    border-radius: var(--btn-radius);
    padding: 14px 24px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    text-align: center;
    transition: background-color var(--transition-speed);
    width: 100%;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
}

.input-control {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--border-light);
    border-radius: var(--input-radius);
    font-family: inherit;
    font-size: 15px;
    transition: border-color var(--transition-speed);
}

.input-control:focus {
    outline: none;
    border-color: var(--accent-blue);
}

/* Media Queries for Desktop Scaling */
@media (min-width: 768px) {
    .container {
        padding: 40px;
        max-width: 1200px;
        margin: 0 auto;
    }
    
    .btn-primary {
        width: auto; /* Buttons shrink to fit content on larger screens */
    }
    
    .grid-layout {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 24px;
    }
}