/*
 * Earhart — global chrome (header, nav, footer) + base typography.
 * All values come from tokens.css (var(--eh-*)). No hex literals allowed here.
 */

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--eh-color-paper);
    color: var(--eh-color-ink);
    font-family: var(--eh-font-body);
    font-size: var(--eh-fs-body);
    line-height: var(--eh-lh-normal);
    font-optical-sizing: auto;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

/* — Paper grain atmosphere — a fixed, non-interactive layer behind everything. */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    background-image: var(--eh-grain-url);
    background-repeat: repeat;
    opacity: 0.5;
    mix-blend-mode: multiply;
}
html[data-theme="dark"] body::before {
    opacity: 0.18;
    mix-blend-mode: screen;
}
@media (prefers-color-scheme: dark) {
    html:not([data-theme="light"]) body::before {
        opacity: 0.18;
        mix-blend-mode: screen;
    }
}

/* — Typography defaults —
 * h1 → Limelight (marquee display, uppercase)
 * h2 → Poiret One (Deco geometric)
 * h3/h4 → Alegreya weight 700 (literary serif)
 */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--eh-font-body);
    font-weight: 700;
    line-height: var(--eh-lh-tight);
    letter-spacing: var(--eh-tracking-normal);
    color: var(--eh-color-ink);
    margin: 0 0 var(--eh-space-4);
}
h1 {
    font-family: var(--eh-font-display);
    font-size: var(--eh-fs-h1);
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: var(--eh-tracking-marquee);
    line-height: 1.05;
}
h2 {
    font-family: var(--eh-font-deco);
    font-size: var(--eh-fs-h2);
    font-weight: 400;
    letter-spacing: var(--eh-tracking-wide);
    text-transform: uppercase;
}
h3 { font-size: var(--eh-fs-h3); font-weight: 700; }
h4 { font-size: var(--eh-fs-lead); font-weight: 700; }

p { margin: 0 0 var(--eh-space-4); max-width: var(--eh-max-prose); }

a {
    color: var(--eh-color-brass-dark);
    text-decoration: underline;
    text-decoration-color: var(--eh-color-rule-brass);
    text-decoration-thickness: 1px;
    text-underline-offset: 0.2em;
    transition: color var(--eh-dur-fast) var(--eh-ease-out),
                text-decoration-color var(--eh-dur-fast) var(--eh-ease-out);
}
a:hover {
    color: var(--eh-color-ink);
    text-decoration-color: var(--eh-color-brass);
}

html[data-theme="dark"] a,
html[data-theme="dark"] a:visited {
    color: var(--eh-color-brass);
}
html[data-theme="dark"] a:hover { color: var(--eh-color-panel-text); }
@media (prefers-color-scheme: dark) {
    html:not([data-theme="light"]) a,
    html:not([data-theme="light"]) a:visited {
        color: var(--eh-color-brass);
    }
    html:not([data-theme="light"]) a:hover { color: var(--eh-color-panel-text); }
}

code, kbd, samp { font-family: var(--eh-font-mono); font-size: 0.92em; }

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

hr {
    border: 0;
    border-top: 1px solid var(--eh-color-rule);
    margin: var(--eh-space-6) 0;
}

/* — Focus discipline —
 * No global :focus { outline: none } — browsers that do not support
 * :focus-visible (older Firefox, some mobile WebViews) fall back to
 * their default outline, which is still better than silent keyboard focus.
 * Modern browsers use the :focus-visible rule below.
 */
:focus-visible {
    outline: 2px solid var(--eh-color-focus);
    outline-offset: 3px;
    border-radius: 2px;
}

/* — Skip link — */
.skip-link {
    position: absolute;
    left: var(--eh-space-3);
    top: var(--eh-space-3);
    padding: var(--eh-space-2) var(--eh-space-4);
    background: var(--eh-color-ink);
    color: var(--eh-color-paper);
    text-decoration: none;
    border-radius: var(--eh-radius-md);
    transform: translateY(-200%);
    z-index: 1000;
}
.skip-link:focus-visible {
    transform: translateY(0);
}
@media (prefers-reduced-motion: no-preference) {
    .skip-link { transition: transform var(--eh-dur-base) var(--eh-ease-out); }
}

/* — Header — */
.site-header {
    position: relative;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: var(--eh-space-5);
    padding: var(--eh-space-5) clamp(var(--eh-space-4), 4vw, var(--eh-space-9));
    background: var(--eh-color-paper-raised);
    border-bottom: 1px solid var(--eh-color-rule-brass);
    box-shadow: var(--eh-shadow-flat);
    z-index: 10;
}

.brand {
    grid-column: 2;
    justify-self: center;
    display: inline-flex;
    align-items: center;
    gap: var(--eh-space-4);
    text-decoration: none;
    color: inherit;
}
.brand:hover,
.brand:visited {
    color: inherit;
    text-decoration: none;
}
.brand-mark {
    width: 52px;
    height: 52px;
    filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.2));
    flex: 0 0 auto;
}
.brand-wordmark {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    line-height: 1;
    gap: var(--eh-space-1);
}
.brand-word {
    font-family: var(--eh-font-display);
    font-size: clamp(1.35rem, 1.05rem + 1.5vw, 2rem);
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: var(--eh-tracking-marquee);
    color: var(--eh-color-ink);
    line-height: 1;
}
.brand-sub {
    display: inline;
    font-family: var(--eh-font-mono);
    font-size: 0.72rem;
    letter-spacing: var(--eh-tracking-caps);
    text-transform: uppercase;
    color: var(--eh-color-ink-muted);
    white-space: nowrap;
}

.site-actions {
    grid-column: 3;
    justify-self: end;
    display: inline-flex;
    align-items: center;
    gap: var(--eh-space-2);
}

/* — Theme toggle — */
.theme-toggle {
    appearance: none;
    border: 1px solid var(--eh-color-rule-brass);
    background: transparent;
    color: var(--eh-color-ink);
    width: 40px;
    height: 40px;
    border-radius: var(--eh-radius-pill);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    position: relative;
    padding: 0;
}
@media (prefers-reduced-motion: no-preference) {
    .theme-toggle {
        transition: background-color var(--eh-dur-fast) var(--eh-ease-out),
                    border-color var(--eh-dur-fast) var(--eh-ease-out),
                    transform var(--eh-dur-fast) var(--eh-ease-out);
    }
}
.theme-toggle:hover {
    background: var(--eh-color-brass-soft);
    border-color: var(--eh-color-brass);
}
.theme-icon {
    width: 18px;
    height: 18px;
    position: absolute;
    inset: 0;
    margin: auto;
}
.theme-icon-sun { opacity: 1; }
.theme-icon-moon { opacity: 0; }
@media (prefers-reduced-motion: no-preference) {
    .theme-icon {
        transition: opacity var(--eh-dur-base) var(--eh-ease-out),
                    transform var(--eh-dur-base) var(--eh-ease-out);
    }
}
html[data-theme="dark"] .theme-icon-sun { opacity: 0; transform: rotate(-30deg); }
html[data-theme="dark"] .theme-icon-moon { opacity: 1; }
@media (prefers-color-scheme: dark) {
    html:not([data-theme="light"]) .theme-icon-sun { opacity: 0; transform: rotate(-30deg); }
    html:not([data-theme="light"]) .theme-icon-moon { opacity: 1; }
}

/* — Nav toggle (mobile hamburger) — */
.nav-toggle {
    display: none;
    appearance: none;
    background: transparent;
    border: 1px solid var(--eh-color-rule-brass);
    color: var(--eh-color-ink);
    width: 40px;
    height: 40px;
    border-radius: var(--eh-radius-md);
    padding: 0;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    position: relative;
}
.nav-toggle:hover {
    background: var(--eh-color-brass-soft);
    border-color: var(--eh-color-brass);
}
.nav-toggle-icon, .nav-toggle-close {
    width: 20px;
    height: 20px;
    position: absolute;
    inset: 0;
    margin: auto;
}
.nav-toggle-close { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-close { opacity: 1; }
@media (prefers-reduced-motion: no-preference) {
    .nav-toggle-icon, .nav-toggle-close {
        transition: opacity var(--eh-dur-base) var(--eh-ease-out);
    }
}

/* — Nav — */
.site-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--eh-color-panel);
    color: var(--eh-color-panel-text);
    box-shadow: var(--eh-shadow-lift);
}
.nav-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: var(--eh-space-2);
    list-style: none;
    margin: 0 auto;
    padding: var(--eh-space-3) var(--eh-space-5);
    max-width: var(--eh-max-wide);
}
.nav-list a {
    display: inline-block;
    padding: var(--eh-space-2) var(--eh-space-4);
    color: var(--eh-color-panel-text);
    text-decoration: none;
    font-family: var(--eh-font-mono);
    font-weight: 700;
    font-size: 0.82rem;
    letter-spacing: var(--eh-tracking-caps);
    text-transform: uppercase;
    position: relative;
    border-radius: var(--eh-radius-sm);
}
@media (prefers-reduced-motion: no-preference) {
    .nav-list a { transition: color var(--eh-dur-fast) var(--eh-ease-out); }
}
.nav-list a::after {
    content: "";
    position: absolute;
    left: var(--eh-space-3);
    right: var(--eh-space-3);
    bottom: 2px;
    height: 2px;
    background: var(--eh-color-brass);
    transform: scaleX(0);
    transform-origin: right center;
}
@media (prefers-reduced-motion: no-preference) {
    .nav-list a::after {
        transition: transform var(--eh-dur-base) var(--eh-ease-out);
    }
}
.nav-list a:hover,
.nav-list a[aria-current="page"] {
    /* Light mode: cream (paper-raised) on navy-deep = ~15:1. Good.
     * Dark mode: paper-raised resolves to near-black on near-black nav =
     * INVISIBLE — overridden below to use brass (amber HUD). */
    color: var(--eh-color-paper-raised);
}
html[data-theme="dark"] .nav-list a:hover,
html[data-theme="dark"] .nav-list a[aria-current="page"] {
    color: var(--eh-color-brass);
}
@media (prefers-color-scheme: dark) {
    html:not([data-theme="light"]) .nav-list a:hover,
    html:not([data-theme="light"]) .nav-list a[aria-current="page"] {
        color: var(--eh-color-brass);
    }
}
.nav-list a:hover::after,
.nav-list a[aria-current="page"]::after {
    transform: scaleX(1);
    transform-origin: left center;
}
.nav-ext {
    font-size: 0.8em;
    opacity: 0.7;
    margin-left: 0.15em;
}

/* — Mobile drawer — */
@media (max-width: 880px) {
    .nav-toggle { display: inline-flex; }
    .brand-sub { display: none; }
    .site-nav[data-open="false"] .nav-list { display: none; }
    .nav-list {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: var(--eh-space-3);
    }
    .nav-list li {
        border-bottom: 1px solid var(--eh-color-rule);
    }
    .nav-list li:last-child { border-bottom: none; }
    .nav-list a {
        display: block;
        padding: var(--eh-space-4);
        text-align: left;
    }
    .nav-list a::after { display: none; }
    .site-header {
        padding: var(--eh-space-4) var(--eh-space-4);
    }
    .brand-mark { width: 44px; height: 44px; }
}

@media (max-width: 480px) {
    .brand-word { font-size: 1.2rem; }
    .brand-mark { width: 40px; height: 40px; }
    .nav-list { padding: var(--eh-space-2); }
    .nav-list a { padding: var(--eh-space-3) var(--eh-space-4); font-size: 0.82rem; }
}

/* — Main / content — */
main {
    flex: 1;
    padding-block: var(--eh-space-7) var(--eh-space-11);
    padding-inline: clamp(var(--eh-space-4), 3vw, var(--eh-space-7));
    scroll-margin-top: calc(var(--eh-nav-height) + var(--eh-space-4));
}

/* — Footer — */
.site-footer {
    background: var(--eh-color-panel);
    color: var(--eh-color-panel-text);
    padding: var(--eh-space-8) var(--eh-space-5) var(--eh-space-6);
    text-align: center;
    font-family: var(--eh-font-mono);
    font-size: var(--eh-fs-caption);
    letter-spacing: var(--eh-tracking-caps);
    text-transform: uppercase;
}
.site-footer .footer-rule {
    width: 72px;
    height: 1px;
    background: var(--eh-color-brass);
    margin: 0 auto var(--eh-space-5);
    opacity: 0.65;
}
.site-footer .footer-mark {
    display: inline-block;
    padding: var(--eh-space-2) var(--eh-space-6);
    margin-bottom: var(--eh-space-3);
    font-family: var(--eh-font-display);
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: var(--eh-tracking-marquee);
    font-size: 1.05rem;
    color: var(--eh-color-panel-text);
    position: relative;
    box-shadow: 0 0 0 1px var(--eh-color-rule-brass), 0 0 0 4px transparent, 0 0 0 5px var(--eh-color-rule-brass);
    border-radius: var(--eh-radius-sm);
}
.site-footer .footer-line {
    /* margin-inline: auto centers the <p> block itself, since its inherited
     * max-width from the global p rule is narrower than the footer. */
    margin: 0 auto;
    color: var(--eh-color-panel-text);
    opacity: 0.75;
    font-size: 0.7rem;
}

/* — Print — */
@media print {
    .site-nav, .site-footer, .theme-toggle, .nav-toggle, .skip-link,
    body::before {
        display: none !important;
    }
    body {
        background: var(--eh-color-print-paper);
        color: var(--eh-color-print-ink);
    }
    main { padding: 0; }
}

/* — Reduced motion global guard — */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
        scroll-behavior: auto !important;
    }
}