/* ShelfTap editorial "paper/ink" design system — site chrome (navbar + footer).
   Loaded globally. Landing-page section styles live in landing.css.
   Ported from shelftap_ui/styles (theme.css + shared.css + page.css). */

:root {
    /* Palette */
    --paper:      #F4F1EA;
    --paper-2:    #EEEAE0;
    --ink:        #0E0E0C;
    --ink-soft:   #5A574E;
    --line:       #D9D4C7;
    --verified:   #1E5E3A;
    --signal:     #C7402B;
    --glow:       #9FE3B8;

    /* Typography */
    --font-display: "Fraunces", Georgia, serif;
    --font-body:    "Inter", system-ui, sans-serif;
    --font-mono:    "JetBrains Mono", ui-monospace, monospace;

    --maxw: 1240px;
    --gutter: clamp(1.25rem, 4vw, 4rem);
    --ease: cubic-bezier(0.16, 1, 0.3, 1);
    /* Fixed header: 1.1rem padding ×2 + 42px burger button */
    --nav-height: calc(2.2rem + 42px);

    /* Fluid scale */
    --fs-display: clamp(3rem, 9vw, 9rem);
    --fs-h1:      clamp(2.2rem, 5vw, 4.5rem);
    --fs-h2:      clamp(1.5rem, 3vw, 2.5rem);
    --fs-body:    clamp(1rem, 1.2vw, 1.25rem);
    --fs-mono:    0.85rem;
}

/* Typographic helpers (opt-in via class, safe globally) */
.font-display { font-family: var(--font-display); letter-spacing: -0.02em; line-height: 1.1; }
.font-mono { font-family: var(--font-mono); font-size: var(--fs-mono); text-transform: uppercase; letter-spacing: 0.05em; }

.wrap { max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }

/* Film-grain: disabled. Live SVG filters AND full-viewport CSS noise tiles both
   cost compositor bandwidth during smooth scroll. Legacy markup is hidden. */
svg.grain {
    display: none !important;
}

/* -------------------------------------------------- Navbar -------------------------------------------------- */
header.nav {
    position: fixed; inset: 0 0 auto 0; z-index: 100;
    display: flex; align-items: center; justify-content: space-between;
    padding: 1.1rem var(--gutter);
    overflow: visible;
    transition: background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
    border-bottom: 1px solid transparent;
    /* Own layer; avoid backdrop-filter which re-blurs everything behind on scroll */
    transform: translateZ(0);
}
header.nav.scrolled {
    /* Solid-ish paper fill instead of backdrop-filter blur (major paint cost) */
    background: color-mix(in srgb, var(--paper) 94%, transparent);
    border-bottom-color: var(--line);
    box-shadow: 0 4px 20px rgba(0,0,0,0.03);
}
.nav .brand { display: flex; align-items: center; gap: 0.6rem; font-family: var(--font-display); font-size: 1.35rem; letter-spacing: -0.02em; color: var(--ink); text-decoration: none; }
.nav .brand .dot { width: 22px; height: 22px; }
.nav-links { display: flex; align-items: center; gap: 1.6rem; overflow: visible; }
.nav-links a.link { font-size: 0.92rem; color: var(--ink-soft); font-weight: 500; text-decoration: none; transition: color 0.25s; }
.nav-links a.link:hover { color: var(--ink); }
.btn-nav {
    display: inline-flex; align-items: center; gap: 0.6rem;
    padding: 0.75rem 1.4rem; border-radius: 100px;
    font-weight: 600; font-size: 0.92rem;
    background: var(--ink); color: var(--paper); text-decoration: none;
    transition: background 0.3s, transform 0.4s var(--ease), box-shadow 0.3s;
}
.btn-nav:hover { background: var(--verified); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(30,94,58,0.2); color: var(--paper); }
.btn-nav .arr { transition: transform 0.4s var(--ease); }
.btn-nav:hover .arr { transform: translateX(4px); }
.nav-login { border: 1px solid var(--line); padding: 0.5rem 1rem; border-radius: 100px; }
.nav-login:hover { border-color: var(--ink); }

/* Nav account avatar + dropdown */
.nav-account { position: relative; }
.nav-avatar { display: inline-flex; align-items: center; gap: 0.5rem; background: none; border: 1px solid var(--line); border-radius: 100px; padding: 0.35rem 0.7rem 0.35rem 0.4rem; cursor: pointer; color: var(--ink); font-size: 0.9rem; font-weight: 500; font-family: inherit; }
.nav-avatar:hover { border-color: var(--ink); }
.nav-avatar img, .nav-avatar .avatar-initials { width: 26px; height: 26px; border-radius: 100px; object-fit: cover; }
.nav-avatar .avatar-initials { display: inline-flex; align-items: center; justify-content: center; background: var(--verified); color: var(--paper); font-size: 0.75rem; font-weight: 700; }
.nav-menu { position: absolute; right: 0; top: calc(100% + 0.5rem); min-width: 12rem; background: color-mix(in srgb, var(--paper) 98%, #fff); border: 1px solid var(--line); border-radius: 14px; box-shadow: 0 24px 48px -24px rgba(14,14,12,0.35); padding: 0.4rem; opacity: 0; visibility: hidden; transform: translateY(-6px); transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), visibility 0.2s; }
.nav-account:hover .nav-menu, .nav-account:focus-within .nav-menu { opacity: 1; visibility: visible; transform: none; }
.nav-menu a, .nav-menu button { display: flex; width: 100%; align-items: center; gap: 0.6rem; padding: 0.6rem 0.8rem; border-radius: 10px; font-size: 0.9rem; color: var(--ink); text-decoration: none; background: none; border: none; cursor: pointer; font-family: inherit; text-align: left; transition: background 0.2s; }
.nav-menu a:hover, .nav-menu button:hover { background: var(--paper-2); }
.nav-menu .danger { color: var(--signal); }
.nav-menu .sep { height: 1px; background: var(--line); margin: 0.35rem 0.4rem; }

/* Language switcher */
.lang-switcher { position: relative; flex-shrink: 0; }
.lang-switcher-toggle {
    display: inline-flex; align-items: center; gap: 0.45rem;
    background: none; border: none; padding: 0; cursor: pointer;
    font-family: inherit; font-size: 0.92rem; font-weight: 500;
    color: var(--ink-soft); transition: color 0.25s;
}
.lang-switcher-toggle:hover,
.lang-switcher-toggle[aria-expanded="true"] { color: var(--ink); }
.lang-switcher-toggle .lang-globe { width: 15px; height: 15px; flex-shrink: 0; }
.lang-switcher-toggle .lang-code { font-size: 0.82rem; font-weight: 600; letter-spacing: 0.04em; }
.lang-switcher-toggle .lang-chevron { font-size: 0.55rem; opacity: 0.45; transition: transform 0.2s var(--ease); }
.lang-switcher-toggle[aria-expanded="true"] .lang-chevron { transform: rotate(180deg); }
.lang-switcher-menu {
    position: absolute; right: 0; top: calc(100% + 0.5rem);
    min-width: 10.5rem;
    background: color-mix(in srgb, var(--paper) 98%, #fff);
    border: 1px solid var(--line); border-radius: 14px;
    box-shadow: 0 24px 48px -24px rgba(14,14,12,0.35);
    padding: 0.4rem; z-index: 110;
    opacity: 0; visibility: hidden; transform: translateY(-6px);
    pointer-events: none;
    transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), visibility 0.2s;
}
.lang-switcher-menu.open {
    opacity: 1; visibility: visible; transform: none;
    pointer-events: auto;
}
.lang-switcher-menu a {
    display: flex; align-items: center; justify-content: space-between; gap: 0.5rem;
    padding: 0.6rem 0.8rem; border-radius: 10px;
    font-size: 0.9rem; color: var(--ink); text-decoration: none; font-weight: 500;
    transition: background 0.2s;
}
.lang-switcher-menu a:hover { background: var(--paper-2); }
.lang-switcher-menu a.is-active { color: var(--verified); }
.lang-switcher-menu a.is-active::after {
    content: ''; width: 6px; height: 6px; border-radius: 50%;
    background: var(--verified); flex-shrink: 0;
}
.nav-mobile-lang { padding: 0; margin: 0; position: relative; overflow: visible; }
.nav-mobile .lang-switcher { width: 100%; }
.nav-mobile .lang-switcher-toggle {
    width: 100%; justify-content: flex-start;
    font-size: 1rem; color: var(--ink);
    padding: 0.85rem 1rem; border-radius: 12px;
    transition: background 0.2s, color 0.2s;
}
.nav-mobile .lang-switcher-toggle:hover,
.nav-mobile .lang-switcher-toggle[aria-expanded="true"] { background: var(--paper-2); color: var(--ink); }
.nav-mobile .lang-switcher-menu {
    position: absolute; left: 0; right: 0; top: calc(100% + 0.25rem);
    min-width: 0; margin: 0;
    box-shadow: 0 24px 48px -24px rgba(14,14,12,0.35);
    transform: translateY(-6px);
    z-index: 111;
}
.nav-mobile .lang-switcher-menu.open { transform: none; }

/* Mobile navigation */
.nav-burger { display: none; flex-direction: column; gap: 5px; width: 42px; height: 42px; align-items: center; justify-content: center; border: 1px solid var(--line); border-radius: 12px; background: color-mix(in srgb, var(--paper) 92%, transparent); cursor: pointer; }
.nav-burger span { width: 18px; height: 2px; background: var(--ink); border-radius: 2px; transition: transform 0.3s var(--ease), opacity 0.2s; }
.nav-burger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-burger.is-open span:nth-child(2) { opacity: 0; }
.nav-burger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.nav-mobile { position: fixed; top: var(--nav-height); left: var(--gutter); right: var(--gutter); z-index: 99; display: flex; flex-direction: column; gap: 0.25rem; padding: 1rem; overflow: visible; background: color-mix(in srgb, var(--paper) 98%, transparent); border: 1px solid var(--line); border-radius: 20px; box-shadow: 0 30px 60px -30px rgba(14,14,12,0.35); opacity: 0; transform: translateY(-10px); transition: opacity 0.3s var(--ease), transform 0.3s var(--ease); pointer-events: none; visibility: hidden; }
.nav-mobile[hidden] { display: none !important; }
.nav-mobile.open { opacity: 1; transform: none; pointer-events: auto; visibility: visible; }
.nav-mobile a, .nav-mobile button { padding: 0.85rem 1rem; border-radius: 12px; color: var(--ink); text-decoration: none; font-weight: 500; font-size: 1rem; transition: background 0.2s; background: none; border: none; cursor: pointer; font-family: inherit; text-align: left; width: 100%; }
.nav-mobile a:hover, .nav-mobile button:hover { background: var(--paper-2); }
.nav-mobile a.btn-nav { color: var(--paper); justify-content: center; margin-top: 0.4rem; }
.nav-mobile .danger { color: var(--signal); }
.nav-mobile .sep { height: 1px; background: var(--line); margin: 0.4rem 0; padding: 0; }
@media (max-width: 900px) { .nav-links { display: none; } .nav-burger { display: flex; } }
@media (min-width: 901px) { .nav-mobile { display: none !important; } }

/* -------------------------------------------------- Footer -------------------------------------------------- */
footer.site-footer { background: var(--ink); color: #8a8678; padding-block: 4rem 2rem; border-top: 1px solid #26241f; position: relative; z-index: 10; }
footer.site-footer .brand { display: flex; align-items: center; gap: 0.6rem; font-family: var(--font-display); font-size: 1.35rem; color: var(--paper); text-decoration: none; }
footer.site-footer .brand .dot { width: 22px; height: 22px; }
.foot-grid { display: flex; justify-content: space-between; gap: 3rem; flex-wrap: wrap; align-items: flex-start; }
.foot-def { max-width: 42ch; color: #b9b5a8; font-size: 0.95rem; line-height: 1.6; margin-top: 1.2rem; }
.foot-links { display: flex; gap: 4rem; flex-wrap: wrap; }
.foot-col { display: flex; flex-direction: column; gap: 0.8rem; font-size: 0.95rem; }
.foot-col b { color: var(--paper); font-weight: 600; font-family: var(--font-mono); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.12em; margin-bottom: 0.5rem; }
.foot-col a { color: inherit; text-decoration: none; transition: color 0.2s; }
.foot-col a:hover { color: var(--glow); }
.foot-bottom { margin-top: 4rem; padding-top: 2rem; border-top: 1px solid #26241f; display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; font-size: 0.85rem; }
.foot-bottom .mono { font-family: var(--font-mono); font-size: 0.8rem; color: var(--glow); opacity: 0.8; }

@media (prefers-reduced-motion: reduce) {
    .btn-pulse { animation: none; }
}