/* ==========================================================================
   Shared sub-page chrome — link AFTER base.css, BEFORE the page stylesheet.

   Provides:
   - Fixed sun/moon theme toggle (top-right counterpart to .back-home-btn)
   - Scroll-reveal classes (same contract as home page: visible by default,
     JS adds .js-reveal only when motion is allowed)
   ========================================================================== */

/* ── Fixed theme toggle ─────────────────────────────────────────────────── */
.theme-toggle {
    position: fixed;
    top: max(1rem, env(safe-area-inset-top));
    right: max(1rem, env(safe-area-inset-right));
    z-index: 1100;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    background: var(--surface-color);
    color: var(--text-color);
    cursor: pointer;
    box-shadow: var(--shadow-1);
    transition: background var(--dur-fast) var(--ease-out),
                color var(--dur-fast) var(--ease-out),
                border-color var(--dur-fast) var(--ease-out),
                transform var(--dur-fast) var(--ease-out);
}

.theme-toggle:hover {
    color: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.theme-toggle:active {
    transform: scale(0.94);
}

.theme-toggle svg { width: 20px; height: 20px; }

/* Show the icon for the theme you'd switch TO */
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* Keep the back-home button clear of notches too */
.back-home-btn {
    top: max(1rem, env(safe-area-inset-top));
    left: max(1rem, env(safe-area-inset-left));
}

/* ── Scroll reveal (identical contract to home page css/layout.css) ─────── */
.animate-on-scroll.js-reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
}

.animate-on-scroll.js-reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
    .animate-on-scroll.js-reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

/* ── Sticky-bottom footer layout ────────────────────────────────────────── */
body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

body > main { flex: 1; }

.page-footer {
    padding: 1rem 1.5rem;
    text-align: center;
    font-size: 0.82rem;
    color: var(--text-muted, #6b7280);
    border-top: 1px solid var(--border-color);
    background: var(--surface-color);
}

.page-footer a {
    color: var(--primary-color);
    text-decoration: none;
}

.page-footer a:hover {
    text-decoration: underline;
}