/* ================================================================
   ref-preview.css
   ----------------------------------------------------------------
   Styles for the Non-intrusive Context Preview system.
   Dark theme uses html[data-theme="dark"] set by theme-switcher.js.
   ================================================================ */

/* ── Ref-link indicator ─────────────────────────────────────── */

a.ref-link {
    text-decoration: underline;
    text-decoration-style: dotted;
    text-underline-offset: 3px;
    cursor: pointer;
    position: relative;
}

a.ref-link::after {
    content: '↗';
    font-size: 0.65em;
    vertical-align: super;
    margin-left: 1px;
    opacity: 0.5;
    transition: opacity var(--transition-fast, 0.2s);
}

a.ref-link:hover::after {
    opacity: 1;
}

/* ── Shared container base ──────────────────────────────────── */

.ref-preview-container {
    font-size: var(--font-size-sm, 0.9rem);
    line-height: 1.65;
    border-radius: 6px;
    z-index: 500;
    position: relative;

    /* Light theme */
    background: #fefaf3;
    border: 1px solid rgba(230, 130, 7, 0.25);
    border-left: 4px solid #e68207;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.ref-preview-container .theorem-title {
    display: block;
    font-weight: bold;
    color: var(--secondary-color, #2c3e50);
    margin-bottom: 0.4rem;
}

/* ── Close button ───────────────────────────────────────────── */

.ref-preview-close {
    position: absolute;
    top: 6px;
    right: 8px;
    background: none;
    border: none;
    font-size: 1.25rem;
    line-height: 1;
    cursor: pointer;
    color: var(--text-muted, #555);
    opacity: 0.45;
    transition: opacity 0.15s;
    padding: 2px 6px;
    border-radius: 3px;
    z-index: 1;
}

.ref-preview-close:hover {
    opacity: 1;
}

/* ── Footer ─────────────────────────────────────────────────── */

.ref-preview-footer {
    margin-top: 0.75rem;
    padding-top: 0.5rem;
    border-top: 1px solid rgba(230, 130, 7, 0.15);
    font-size: 0.82rem;
}

.ref-preview-footer a {
    color: var(--primary-color, #3498db);
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.15s;
}

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

/* ── Content area ───────────────────────────────────────────── */

.ref-preview-content {
    overflow-x: auto;
    color: var(--text-color, #333);
}

.ref-preview-content p {
    margin: 0.4rem 0;
}

.ref-preview-content p:first-child {
    margin-top: 0;
}

/* ================================================================
   DESKTOP MODE — Sidenote (margin note)
   ================================================================ */

.ref-preview-sidenote {
    position: absolute;
    width: 320px;
    max-width: calc(100vw - 40px);
    max-height: 60vh;
    overflow-y: auto;
    padding: 1rem 1rem 0.75rem;

    /* Animation */
    opacity: 0;
    transform: translateX(8px);
    transition: opacity 0.28s ease, transform 0.28s ease;
    pointer-events: none;
}

.ref-preview-sidenote.visible {
    opacity: 1;
    transform: translateX(0);
    pointer-events: auto;
}

.ref-preview-sidenote.closing {
    opacity: 0;
    transform: translateX(8px);
    pointer-events: none;
}

/* ================================================================
   MOBILE MODE — Inline expansion
   ================================================================ */

.ref-preview-inline {
    max-height: 0;
    overflow: hidden;
    padding: 0 1rem;
    transition: max-height 0.28s ease, padding 0.28s ease;
    margin: 0.5rem 0;
}

.ref-preview-inline.expanded {
    padding: 1rem;
}

/* ================================================================
   DARK THEME — scoped via html[data-theme="dark"]
   ================================================================ */

html[data-theme="dark"] .ref-preview-container {
    background: rgba(251, 146, 60, 0.06);
    border: 1px solid rgba(251, 146, 60, 0.18);
    border-left: 4px solid #d97706;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
}

html[data-theme="dark"] .ref-preview-container .theorem-title {
    color: #f59e0b;
}

html[data-theme="dark"] .ref-preview-close {
    color: rgba(255, 255, 255, 0.5);
}

html[data-theme="dark"] .ref-preview-close:hover {
    color: #f1f5f9;
    background: rgba(255, 255, 255, 0.08);
}

html[data-theme="dark"] .ref-preview-footer {
    border-top-color: rgba(251, 146, 60, 0.12);
}

html[data-theme="dark"] .ref-preview-footer a {
    color: #64b4ff;
}

html[data-theme="dark"] .ref-preview-footer a:hover {
    color: #a0c4ff;
}

html[data-theme="dark"] .ref-preview-content {
    color: rgba(255, 255, 255, 0.87);
}

html[data-theme="dark"] .ref-preview-sidenote::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
}

/* ================================================================
   RESPONSIVE
   ================================================================ */

@media (max-width: 1024px) {
    .ref-preview-sidenote {
        display: none !important;
    }
}

/* Scrollbar for sidenote overflow */
.ref-preview-sidenote::-webkit-scrollbar {
    width: 5px;
}

.ref-preview-sidenote::-webkit-scrollbar-track {
    background: transparent;
}

.ref-preview-sidenote::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.15);
    border-radius: 3px;
}