/* ==========================================================================
   Responsive behaviour and user preferences.

   Most of the layout is intrinsically responsive — fluid type via clamp(),
   `auto-fit` grids, and flex wrapping — so this file only holds the things
   that genuinely need a breakpoint, plus the preference media queries.

   NOTE: breakpoint values are written literally. CSS custom properties
   cannot appear in a media feature value — `@media (min-width: var(--bp))`
   is invalid and the browser discards the entire at-rule, which once
   silently disabled every rule in this file.
   ========================================================================== */

/* --- Mobile navigation ---------------------------------------------------
   Below 900px the inline menu collapses into a panel dropped from the
   header. It is positioned rather than display-toggled so it can animate,
   and `visibility` keeps it out of the tab order while closed. */
@media (max-width: 900px) {
    .nav-toggle {
        display: inline-flex;
    }

    .nav-logo-role {
        display: none;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: var(--space-2) var(--layout-page-padding) var(--space-5);
        background-color: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-lg);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-0.5rem);
        transition:
            opacity var(--transition-fast),
            transform var(--transition-normal) var(--ease-out),
            visibility var(--transition-normal);
    }

    .nav-menu-open {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .nav-item {
        border-bottom: 1px solid var(--color-rule);
    }

    .nav-item:last-child {
        border-bottom: none;
    }

    .nav-link {
        padding: var(--space-4) var(--space-2);
        font-size: var(--font-size-base);
        border-radius: 0;
    }

    .nav-link.active::after {
        left: 0;
        right: auto;
        top: 50%;
        bottom: auto;
        width: 2px;
        height: 1.2rem;
        transform: translateY(-50%);
    }

    .nav-link.active {
        padding-left: var(--space-4);
    }
}

/* Above the mobile breakpoint the panel styles must not linger. */
@media (min-width: 901px) {
    .nav-menu {
        opacity: 1;
        visibility: visible;
    }
}

/* --- Small phones --------------------------------------------------------- */
@media (max-width: 480px) {
    .hero-fact {
        grid-template-columns: 1fr;
        gap: var(--space-1);
    }

    .hero-actions .btn,
    .form-actions .btn {
        width: 100%;
    }

    .certification-item {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* --- Motion preference ----------------------------------------------------
   Honour the OS setting, but keep short state transitions so hover and
   focus still read as feedback rather than as instant jumps. */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    html {
        scroll-behavior: auto;
    }

    .btn,
    .link,
    .badge,
    .card,
    .nav-link,
    .project-card,
    .theme-toggle {
        transition-duration: var(--transition-fast) !important;
    }

    /* Decorative movement is dropped entirely rather than sped up. */
    .project-card:hover,
    .highlight-item:hover {
        transform: none !important;
    }

    .project-card:hover .project-image img {
        transform: none !important;
    }
}

/* --- Print ----------------------------------------------------------------
   A recruiter printing the page should get the content, not the chrome. */
@media print {
    .site-header,
    .site-footer,
    .hero-actions,
    .contact-form,
    .skip-to-content,
    .theme-toggle,
    .nav-toggle {
        display: none !important;
    }

    .section {
        padding-block: var(--space-5);
        break-inside: avoid;
    }

    .project-card,
    .education-card {
        break-inside: avoid;
        box-shadow: none;
    }

    a[href^="http"]::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
        word-break: break-all;
    }
}