/**
 * ByteStream Base Styles & Typography Hierarchy
 */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    line-height: 1.65;
    color: var(--color-dark-gray);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1 0 auto;
    width: 100%;
    min-width: 0;
}

/* Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
    color: var(--color-primary-navy);
    font-family: var(--font-sans);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.025em;
}

h1 {
    font-size: clamp(2.25rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
}

h2 {
    font-size: clamp(1.75rem, 3.5vw, 2.5rem);
    font-weight: 700;
    letter-spacing: -0.025em;
}

h3 {
    font-size: clamp(1.35rem, 2.5vw, 1.75rem);
    font-weight: 600;
}

h4 {
    font-size: var(--font-size-xl);
    font-weight: 600;
}

h5 {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

h6 {
    font-size: var(--font-size-base);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

p {
    margin-bottom: var(--space-4);
    color: var(--color-dark-gray);
    font-size: var(--font-size-base);
}

p:last-child {
    margin-bottom: 0;
}

p.lead {
    font-size: clamp(1.05rem, 2vw, 1.25rem);
    line-height: 1.6;
    color: var(--color-muted-gray);
}

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

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

ul, ol {
    list-style: none;
}

img {
    display: block;
    max-width: 100%;
    height: auto;
}

svg {
    display: block;
    flex-shrink: 0;
}

/* Global Icon Sizing Standard */
svg.icon-xs, .icon-xs {
    width: 14px !important;
    height: 14px !important;
    min-width: 14px !important;
    min-height: 14px !important;
    max-width: 14px !important;
    max-height: 14px !important;
    flex-shrink: 0;
    display: inline-block;
    vertical-align: middle;
}

svg.icon-sm, .icon-sm {
    width: 18px !important;
    height: 18px !important;
    min-width: 18px !important;
    min-height: 18px !important;
    max-width: 18px !important;
    max-height: 18px !important;
    flex-shrink: 0;
    display: inline-block;
    vertical-align: middle;
}

svg.icon-md, .icon-md {
    width: 24px !important;
    height: 24px !important;
    min-width: 24px !important;
    min-height: 24px !important;
    max-width: 24px !important;
    max-height: 24px !important;
    flex-shrink: 0;
    display: inline-block;
    vertical-align: middle;
}

svg.icon-lg, .icon-lg {
    width: 32px !important;
    height: 32px !important;
    min-width: 32px !important;
    min-height: 32px !important;
    max-width: 32px !important;
    max-height: 32px !important;
    flex-shrink: 0;
    display: inline-block;
    vertical-align: middle;
}

svg.icon-xl, .icon-xl {
    width: 44px !important;
    height: 44px !important;
    min-width: 44px !important;
    min-height: 44px !important;
    max-width: 44px !important;
    max-height: 44px !important;
    flex-shrink: 0;
    display: inline-block;
    vertical-align: middle;
}

.check-icon {
    width: 16px !important;
    height: 16px !important;
    min-width: 16px !important;
    min-height: 16px !important;
    flex-shrink: 0;
}

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
}

/* Accessibility: Focus Visible Standards */
:focus-visible {
    outline: 2px solid var(--color-primary-blue);
    outline-offset: 3px;
    border-radius: var(--radius-xs);
}

/* Text Selection */
::selection {
    background-color: var(--color-primary-blue);
    color: var(--color-white);
}

/* Skip link for screen readers */
.skip-to-content {
    position: absolute;
    top: -100px;
    left: var(--space-4);
    background: var(--color-primary-navy);
    color: var(--color-white);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-md);
    z-index: 9999;
    font-weight: 600;
    transition: top var(--transition-fast);
}

.skip-to-content:focus {
    top: var(--space-4);
}