:root {
    /* Palette: Clean White / Tech Blue / Deep Navy */
    --bg-color: #ffffff;
    --bg-secondary: #f8fafc;
    --text-main: #334155; /* Slate 700 */
    --text-heading: #0f172a; /* Slate 900 */
    --primary: #2563eb; /* Royal Blue */
    --primary-dark: #1d4ed8;
    --accent: #0ea5e9; /* Sky Blue */
    --danger: #ef4444;
    --success: #10b981;
    --border: #e2e8f0;

    --container-width: 1100px;
    --radius: 12px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

h1, h2, h3, h4 {
    font-family: 'Space Grotesk', sans-serif;
    color: var(--text-heading);
    line-height: 1.2;
    letter-spacing: -0.02em;
    padding-bottom: 4px;
}

a { text-decoration: none; color: inherit; }

/* Layout */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

section {
    padding: 64px 0;
}

/* Utilities */
.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.bg-secondary { background-color: var(--bg-secondary); }
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }
.check-green { color: var(--success); }

.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease-out, transform 0.6s ease-out; }
.fade-in.visible { opacity: 1; transform: translateY(0); }