/* ==========================================================================
   Base Styles — Reset, Typography, Global
   ========================================================================== */

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

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

body {
    font-family: var(--font-body);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    transition: background-color var(--transition-base), color var(--transition-base);
    overflow-x: hidden;
}

img,
picture,
video,
svg {
    display: block;
    max-width: 100%;
    height: auto;
}

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

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    color: inherit;
}

/* --- Typography --- */
h1, h2, h3, h4 {
    font-family: var(--font-display);
    line-height: 1.1;
    letter-spacing: -0.02em;
    color: var(--color-text);
}

h1 {
    font-size: var(--text-hero);
    text-transform: uppercase;
}

h2 {
    font-size: var(--text-3xl);
    text-transform: uppercase;
}

h3 {
    font-size: var(--text-2xl);
}

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

p {
    max-width: 65ch;
    color: var(--color-text-secondary);
}

/* --- Layout --- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: var(--container-padding);
}

.full-width {
    width: 100vw;
    margin-left: calc(-50vw + 50%);
}

/* --- Utility --- */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

.text-mono {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* --- Scroll Reveal Animation --- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger delays for children */
.reveal-stagger > .reveal:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger > .reveal:nth-child(2) { transition-delay: 100ms; }
.reveal-stagger > .reveal:nth-child(3) { transition-delay: 200ms; }
.reveal-stagger > .reveal:nth-child(4) { transition-delay: 300ms; }
.reveal-stagger > .reveal:nth-child(5) { transition-delay: 400ms; }
.reveal-stagger > .reveal:nth-child(6) { transition-delay: 500ms; }

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--space-xl) 0 var(--space-lg);
    margin-top: var(--space-section);
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-xl);
}

.footer-tagline {
    margin-top: var(--space-sm);
    color: var(--color-text-secondary);
}

.footer-heading {
    font-family: var(--font-body);
    font-size: var(--text-sm);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-sm);
}

.footer-nav ul,
.footer-contact ul {
    list-style: none;
}

.footer-nav li,
.footer-contact li {
    margin-bottom: var(--space-xs);
}

.footer-nav a,
.footer-contact a {
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    transition: color var(--transition-fast);
}

.footer-nav a:hover,
.footer-contact a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    margin-top: var(--space-xl);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}

.footer-bottom p {
    font-size: var(--text-xs);
    color: var(--color-text-secondary);
}

@media (max-width: 700px) {
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
}

/* ==========================================================================
   404 Page
   ========================================================================== */

.error-404 {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 72px;
}

.error-404-content {
    text-align: center;
}

.error-404-content .text-mono {
    color: var(--color-accent);
    font-size: var(--text-3xl);
    display: block;
    margin-bottom: var(--space-sm);
}

.error-404-content h1 {
    margin-bottom: var(--space-md);
}

.error-404-content p {
    color: var(--color-text-secondary);
    margin: 0 auto var(--space-lg);
}

/* --- Skip to Content --- */
.skip-to-content {
    position: absolute;
    top: -100%;
    left: 0;
    z-index: 9999;
    padding: 1rem 2rem;
    background: var(--color-accent);
    color: #0A0A0A;
    font-weight: 700;
    text-decoration: none;
    transition: top var(--transition-fast);
}

.skip-to-content:focus {
    top: 0;
    color: #0A0A0A;
}