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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-weight: 400;
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.65;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
}

/* Subtle grain overlay for tactile depth */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 256px 256px;
    pointer-events: none;
    z-index: 9999;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-text);
    letter-spacing: -0.01em;
}

h1 {
    font-size: clamp(2.2rem, 5vw, 3.2rem);
    font-weight: 700;
}

h2 {
    font-size: clamp(1.6rem, 3.5vw, 2.2rem);
}

h3 {
    font-size: clamp(1.2rem, 2.5vw, 1.6rem);
}

/* Standardized heading scale */
.heading-hero { font-size: clamp(2.5rem, 6vw, 3.5rem); }
.heading-page { font-size: clamp(2rem, 4vw, 2.8rem); }
.heading-section { font-size: clamp(1.3rem, 3vw, 1.6rem); }

/* Skip to content — screen reader / keyboard accessibility */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-primary);
    color: var(--color-text-on-primary);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    z-index: 200;
    transition: top var(--duration-fast) var(--ease-out);
}

.skip-link:focus {
    top: var(--space-sm);
    color: var(--color-text-on-primary);
}

/* Copy button success state */
.copy-btn {
    transition: all var(--duration-fast) var(--ease-out);
    min-width: 5.5rem;
}

.copy-btn--success {
    background: var(--color-success);
    color: var(--color-text-on-primary);
    border-color: var(--color-success);
}

p {
    max-width: 60ch;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-out);
}

a:hover {
    color: var(--color-primary-hover);
}