/* Design System Specification: High-End Editorial Tech */
:root {
    /* Colors */
    --surface-container-lowest: #ffffff;
    --surface-container-low: #f3f3f4;
    --surface: #f9f9f9;
    --primary: #0058bc;
    --primary-container: #0070eb;
    --primary-fixed: #d8e2ff;
    --on-surface: #1a1c1c;
    --secondary: #5e5e5e;
    --outline-variant: #c1c6d7;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 7rem;

    /* Radii */
    --radius-md: 0.375rem;
    --radius-xl: 0.75rem;
}

body {
    margin: 0;
    font-family: 'Inter', sans-serif;
    color: var(--on-surface);
    background-color: var(--surface);
    line-height: minimum(1.6);
    padding: 0 var(--spacing-lg);
}

/* Layering System */
.level-0-surface {
    background-color: var(--surface);
}

.level-1-surface {
    background-color: var(--surface-container-low);
}

.level-2-surface {
    background-color: var(--surface-container-lowest);
    box-shadow: 0 20px 40px rgba(26, 28, 28, 0.04);
}

/* Typography */
.display-lg {
    font-size: 3.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-sm);
}

.headline-lg {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.body-lg {
    font-size: 1rem;
    line-height: 1.6;
}

.body-sm {
    font-size: 0.875rem;
    line-height: 1.5;
}

.label-md {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1rem;
    color: var(--primary);
    display: block;
    margin-bottom: var(--spacing-xs);
}

.secondary-text {
    color: var(--secondary);
}

/* Navigation */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
}

.logo {
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

/* Buttons */
button,
.btn {
    cursor: pointer;
    font-family: 'Inter', sans-serif;
    outline: none;
    border: none;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    text-decoration: none;
}

.primary-btn {
    background-color: var(--primary);
    color: white;
    border-radius: var(--radius-md);
    transition: transform 0.2s, box-shadow 0.2s;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 88, 188, 0.2);
}

.glass-btn {
    background: linear-gradient(135deg, var(--primary), var(--primary-container));
}

.secondary-btn {
    background-color: var(--surface-container-lowest);
    color: var(--on-surface);
    border-radius: var(--radius-md);
    border: 1px solid rgba(193, 198, 215, 0.15);
    /* Ghost border */
}

.tertiary-btn {
    background: none;
    color: var(--on-surface);
    position: relative;
    padding: 0.5rem 0;
}

.tertiary-btn::after {
    content: '';
    position: absolute;
    width: 100%;
    transform: scaleX(0);
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--primary);
    transform-origin: bottom right;
    transition: transform 0.25s ease-out;
}

.tertiary-btn:hover::after {
    transform: scaleX(1);
    transform-origin: bottom left;
}

/* Layout Blocks */
.hero {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-xl) var(--spacing-lg);
    border-radius: var(--radius-xl);
    display: flex;
    flex-direction: column;
    /* Asymmetrical balance */
    padding-left: 10%;
    padding-right: 30%;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.nodes-section {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg) 0;
}

.nodes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

/* Cards / Nodes */
.card {
    padding: var(--spacing-md);
    border-radius: var(--radius-xl);
    border: 0.5px solid rgba(193, 198, 215, 0.15);
    /* Retina crispness */
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
}

.agent-node {
    background-color: var(--primary-fixed);
}

/* Modal and Glassmorphism */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(249, 249, 249, 0.7);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
    z-index: 1000;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background: var(--surface-container-lowest);
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 500px;
    box-shadow: 0 40px 100px rgba(0, 88, 188, 0.08);
    transform: translateY(30px);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    border: 0.5px solid rgba(193, 198, 215, 0.2);
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

/* Forms */
.input-group {
    margin-bottom: var(--spacing-md);
}

.input-group input {
    width: 100%;
    box-sizing: border-box;
    padding: 1rem;
    background: var(--surface-container-lowest);
    border: 1px solid var(--outline-variant);
    border-radius: var(--radius-md);
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    color: var(--on-surface);
    transition: all 0.3s ease;
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(0, 88, 188, 0.1);
}