/* ============================================
   BASE STYLES — Reset, Typography, Utilities
   ============================================ */

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography — headings use same Inter font, heavier weights */
h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.25;
    color: var(--color-text);
}

h1 { font-size: 2rem; letter-spacing: -0.03em; }
h2 { font-size: 1.5rem; letter-spacing: -0.02em; }
h3 { font-size: 1.25rem; letter-spacing: -0.01em; }
h4 { font-size: 1.0625rem; }

p {
    margin-bottom: var(--space-md);
    color: var(--color-text-light);
    font-size: 0.9375rem;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: #b45309;
}

/* Utility Classes */
.text-muted { color: var(--color-text-muted); }
.text-light { color: var(--color-text-light); }
.text-primary { color: var(--color-primary); }
.text-accent { color: var(--color-accent); }
.text-optimal { color: var(--color-optimal); }
.text-suboptimal { color: var(--color-yellow-soft); }
.text-critical { color: var(--color-critical); }

.font-heading { font-family: var(--font-heading); }
.font-body { font-family: var(--font-body); }

.text-center { text-align: center; }
.text-right { text-align: right; }

.fw-300 { font-weight: 300; }
.fw-400 { font-weight: 400; }
.fw-500 { font-weight: 500; }
.fw-600 { font-weight: 600; }
.fw-700 { font-weight: 700; }

.hidden { display: none !important; }
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    border: 0;
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}