/* ============================================================
   BALLOON POPUP — Iframe-based external link viewer
   ============================================================ */

.balloon-popup {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 99999;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    padding: 20px;
    box-sizing: border-box;
}

.balloon-popup.open {
    opacity: 1;
    visibility: visible;
}

.balloon-popup-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: var(--bg-color);
    border-bottom: 2px dashed var(--card-border-soft);
    font-family: var(--pixel-font);
    font-size: 0.8rem;
    color: var(--text-color);
}

.balloon-popup-title {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
    margin-right: 12px;
}

.balloon-popup-header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.balloon-popup-open-tab {
    font-family: var(--pixel-font);
    font-size: 0.9rem;
    background: none;
    border: 1px solid var(--card-border-soft);
    color: var(--text-muted);
    cursor: pointer;
    padding: 2px 8px;
    text-decoration: none;
    transition: color 0.2s, border-color 0.2s;
    display: inline-flex;
    align-items: center;
}

.balloon-popup-open-tab:hover {
    color: var(--accent-color);
    border-color: var(--accent-color);
}

.balloon-popup-close {
    font-family: var(--pixel-font);
    font-size: 1.2rem;
    background: none;
    border: 1px solid var(--text-color);
    color: var(--text-color);
    cursor: pointer;
    padding: 2px 10px;
    transition: background 0.2s, color 0.2s;
}

.balloon-popup-close:hover {
    background: var(--text-color);
    color: var(--bg-color);
}

.balloon-popup-container {
    display: flex;
    flex-direction: column;
    width: 90vw;
    max-width: 1100px;
    height: 85vh;
    max-height: 800px;
    background: var(--bg-color);
    border: 2px dashed var(--card-border-soft);
    transform: scale(0.9) translateY(20px);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    overflow: hidden;
}

.balloon-popup.open .balloon-popup-container {
    transform: scale(1) translateY(0);
}

.balloon-popup-body {
    flex: 1;
    display: flex;
    min-height: 0;
    background: var(--bg-color);
}

.balloon-popup-body iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* Fallback when iframe is blocked by X-Frame-Options / CSP */
.balloon-popup-fallback {
    display: none;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    background: var(--bg-color);
    padding: 24px;
    text-align: center;
}

.balloon-popup-fallback-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    max-width: 400px;
}

.balloon-popup-fallback-content p {
    font-family: var(--code-font);
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.balloon-popup-fallback-link {
    font-family: var(--pixel-font);
    font-size: 0.85rem;
    color: var(--accent-color);
    text-decoration: none;
    border: 1px solid var(--accent-color);
    padding: 8px 16px;
    transition: background 0.2s, color 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.balloon-popup-fallback-link:hover {
    background: var(--accent-color);
    color: var(--bg-color);
}

@media (max-width: 768px) {
    .balloon-popup {
        padding: 10px;
    }

    .balloon-popup-container {
        width: 100vw;
        height: 100vh;
        max-width: none;
        max-height: none;
        border: none;
    }
}