/* Structural layout: app shell, content containers, navbar and footer. */
.app-shell {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Centered content wrappers (replace Bootstrap's container/row/col). */
.app-container {
    width: min(100% - 2rem, var(--app-content-width));
    margin-inline: auto;
}

.app-narrow {
    width: min(100% - 2rem, 760px);
    margin-inline: auto;
}

.app-content {
    width: min(100% - 2rem, 960px);
    margin-inline: auto;
}

/* ---- Navbar ---- */
.app-navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--app-border);
    background: rgba(13, 17, 23, 0.85);
    backdrop-filter: blur(12px);
}

.app-navbar__inner {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    min-height: 3.5rem;
}

.app-brand {
    display: inline-flex;
    align-items: center;
    font-family: var(--app-font-mono);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--app-text-strong);
}

.app-brand__prompt {
    margin-right: 0.4rem;
    color: var(--app-green);
}

.app-brand__cursor {
    display: inline-block;
    width: 0.5rem;
    height: 1rem;
    margin-left: 0.28rem;
    background: var(--app-green);
    animation: app-blink 1.1s steps(1) infinite;
}

@keyframes app-blink {
    50% {
        opacity: 0;
    }
}

.app-nav {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.app-nav-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 2.4rem;
    height: 2.4rem;
    border: 1px solid var(--app-border-strong);
    border-radius: var(--app-radius);
    color: var(--app-text);
}

.app-nav-toggle:hover {
    border-color: var(--app-green);
    color: var(--app-text-strong);
}

@media (max-width: 800px) {
    .app-nav-toggle {
        display: inline-flex;
    }

    .app-nav {
        position: absolute;
        top: calc(100% + 1px);
        right: 0;
        left: 0;
        z-index: 50;
        display: none;
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
        padding: 1rem;
        border-bottom: 1px solid var(--app-border);
        background: var(--app-surface);
        box-shadow: var(--app-shadow);
    }

    .app-nav.is-open {
        display: flex;
    }
}

/* ---- Footer (terminal status bar) ---- */
.app-footer {
    border-top: 1px solid var(--app-border-strong);
    background: var(--app-surface-2);
}

.app-footer__inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.6rem 1.5rem;
    padding-block: 0.85rem;
    font-family: var(--app-font-mono);
    font-size: 0.8rem;
    color: var(--app-muted);
}

/* Leading prompt glyph, like a shell status line. */
.app-footer__inner > :first-child::before {
    margin-right: 0.6ch;
    color: var(--app-green);
    content: "$";
}

.app-footer__links {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1.25rem;
}

.app-footer a {
    color: var(--app-muted);
}

.app-footer a:hover {
    color: var(--app-text-strong);
}

.app-version-badge {
    opacity: 0.6;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.04em;
}

/* Reduced-motion users: freeze the cursor blink. */
@media (prefers-reduced-motion: reduce) {
    .app-brand__cursor {
        animation: none;
    }
}