/* ICRS Design System: Structural Precision */
:root {
    /* Color Palette */
    --primary: #001332;
    --primary-container: #002759;
    --on-primary: #ffffff;
    --secondary: #a63b00;
    --on-secondary: #ffffff;
    --secondary-container: #fc6c29;
    --tertiary: #0b1800;
    --tertiary-fixed: #b5f65f;
    --on-tertiary-fixed: #102000;
    
    /* Surface Palette */
    --surface: #f8f9ff;
    --on-surface: #0b1c30;
    --surface-container-lowest: #ffffff;
    --surface-container-low: #eff4ff;
    --surface-container: #e5eeff;
    --surface-container-high: #dce9ff;
    --surface-container-highest: #d3e4fe;
    --surface-dim: #cbdbf5;
    --surface-variant: #d3e4fe;
    --on-surface-variant: #44474f;
    
    /* Outline & Misc */
    --outline: #747780;
    --outline-variant: rgba(196, 198, 209, 0.2);
    
    /* Layout */
    --max-width: 1280px;
    --header-height: 80px;
}

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

body {
    background-color: var(--surface);
    color: var(--on-surface);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Inter', sans-serif;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.04em;
}

.label {
    font-family: 'Space Grotesk', sans-serif;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    font-size: 0.75rem;
    font-weight: 700;
}

p {
    font-size: 1rem;
    color: var(--on-surface-variant);
}

.display-lg { font-size: clamp(3.5rem, 8vw, 6rem); font-weight: 900; }
.display-md { font-size: clamp(2.5rem, 5vw, 4rem); font-weight: 900; }
.display-sm { font-size: 1.5rem; font-weight: 900; letter-spacing: -0.05em; line-height: 1; }
.title-lg { font-size: 2rem; }

/* Structural Rules */
section {
    padding: 100px 2rem;
    position: relative;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
}

/* Background Shifts (The No-Line Rule) */
.bg-surface-low { background-color: var(--surface-container-low); }
.bg-surface-lowest { background-color: var(--surface-container-lowest); }
.bg-primary-container { background-color: var(--primary-container); color: var(--on-primary); }

/* Glass Headers */
header.sticky-nav {
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--outline-variant); /* Exception for high contrast orientation */
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    border-radius: 0.5rem;
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    text-decoration: none;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-container) 100%);
    color: var(--on-primary);
    box-shadow: 0 10px 30px rgba(0, 19, 50, 0.2);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(0, 19, 50, 0.3);
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--outline-variant);
    color: var(--primary);
}

.btn-secondary:hover {
    background: var(--surface-container-low);
    border-color: var(--primary);
}

.btn-accent {
    background: var(--secondary);
    color: var(--on-secondary);
}

/* Utilities */
.blueprint-pattern {
    background-image: radial-gradient(var(--outline-variant) 1px, transparent 1px);
    background-size: 24px 24px;
}

.accent-bar {
    width: 4px;
    height: 48px;
    background-color: var(--secondary);
    display: inline-block;
}

/* Logo & Broken Ring Motif */
.broken-ring-svg {
    width: 64px;
    height: 64px;
}

/* Responsive Navigation */
.nav-links {
    display: flex;
    gap: 2.5rem;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--on-surface-variant);
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: color 0.3s;
}

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

/* Mobile optimizations */
@media (max-width: 768px) {
    .nav-links {
        display: none; /* Mobile menu logic to be implemented */
    }
    section {
        padding: 60px 1.5rem;
    }
}