/* =========================================================
   BUGHUNT: DFS PROGRESSION & HUD PANEL STYLES (css/dfs.css)
   Fully adaptive across all 6 BugHunt Visual Themes:
   - Cyber Violet (Default)
   - Matrix Emerald
   - Cyber Cyan
   - Crimson Blaze
   - Amber Gold
   - Synthwave Retro
   ========================================================= */

/* --- 1. Compact DFS Toggle Pill in Top Bar --- */
.dfs-hud-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--theme-card-bg-subtle, rgba(24, 18, 38, 0.7));
    border: 1px solid var(--theme-border, rgba(139, 92, 246, 0.35));
    border-radius: 999px;
    padding: 3px 10px;
    color: var(--theme-text-title, #f8fafc);
    font-family: inherit;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 0 10px var(--theme-glow-soft, rgba(139, 92, 246, 0.15));
    user-select: none;
}

.dfs-hud-pill:hover {
    border-color: var(--theme-border-hover, #a78bfa);
    background: var(--theme-card-bg, rgba(18, 14, 28, 0.95));
    box-shadow: 0 0 14px var(--theme-glow, rgba(139, 92, 246, 0.3));
    transform: translateY(-1px);
}

.dfs-hud-pill.active {
    background: var(--theme-primary, #7c3aed);
    border-color: var(--theme-accent, #a78bfa);
    color: #ffffff;
    box-shadow: 0 0 16px var(--theme-glow-strong, rgba(139, 92, 246, 0.5));
}

.dfs-hud-pill .dfs-icon {
    font-size: 0.85rem;
    color: var(--theme-accent, #a78bfa);
}

.dfs-hud-pill.active .dfs-icon {
    color: #ffffff;
}

.dfs-pill-caret {
    font-size: 0.65rem;
    transition: transform 0.2s ease;
    opacity: 0.8;
}

.dfs-hud-pill.active .dfs-pill-caret {
    transform: rotate(180deg);
}

/* --- 2. Expandable DFS Scenario Drawer --- */
.dfs-scenario-drawer {
    width: 100%;
    max-width: 1200px;
    margin: 8px auto 14px auto;
    background: var(--theme-card-bg, rgba(18, 14, 28, 0.95));
    border: 1px solid var(--theme-border, rgba(139, 92, 246, 0.35));
    border-radius: 12px;
    padding: 14px 18px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5), 0 0 20px var(--theme-glow-soft, rgba(139, 92, 246, 0.15));
    animation: dfsDrawerSlideDown 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    position: relative;
    z-index: 40;
}

@keyframes dfsDrawerSlideDown {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.dfs-drawer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--theme-border-subtle, rgba(139, 92, 246, 0.18));
    margin-bottom: 12px;
}

.dfs-drawer-title-group {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.dfs-mode-tag {
    font-size: 0.65rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    color: var(--theme-accent, #a78bfa);
    text-transform: uppercase;
}

.dfs-drawer-title {
    margin: 0;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--theme-text-title, #f8fafc);
    letter-spacing: 0.02em;
}

.dfs-drawer-header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.dfs-action-badge {
    padding: 3px 8px;
    border-radius: 6px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.dfs-action-badge.action-start {
    background: rgba(59, 130, 246, 0.18);
    color: #60a5fa;
    border: 1px solid rgba(59, 130, 246, 0.4);
}

.dfs-action-badge.action-descent {
    background: rgba(16, 185, 129, 0.18);
    color: #34d399;
    border: 1px solid rgba(16, 185, 129, 0.4);
}

.dfs-action-badge.action-backtrack {
    background: rgba(245, 158, 11, 0.18);
    color: #fbbf24;
    border: 1px solid rgba(245, 158, 11, 0.4);
}

.dfs-action-badge.action-boss {
    background: rgba(239, 68, 68, 0.18);
    color: #f87171;
    border: 1px solid rgba(239, 68, 68, 0.4);
}

.dfs-action-badge.action-reset {
    background: rgba(148, 163, 184, 0.18);
    color: #cbd5e1;
    border: 1px solid rgba(148, 163, 184, 0.4);
}

.dfs-action-badge.action-cleared {
    background: rgba(168, 85, 247, 0.18);
    color: #c084fc;
    border: 1px solid rgba(168, 85, 247, 0.4);
}

.dfs-drawer-close-btn {
    background: transparent;
    border: 1px solid var(--theme-border-subtle, rgba(139, 92, 246, 0.2));
    border-radius: 6px;
    color: var(--theme-text-sub, #cbd5e1);
    font-size: 0.72rem;
    font-weight: 600;
    padding: 3px 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.dfs-drawer-close-btn:hover {
    border-color: var(--theme-border-hover, #a78bfa);
    color: var(--theme-text-title, #f8fafc);
}

/* --- 3-Column Mini Telemetry Deck --- */
.dfs-telemetry-deck {
    display: grid;
    grid-template-columns: 1.2fr 1.4fr 1.4fr;
    gap: 12px;
    margin-bottom: 12px;
}

@media (max-width: 900px) {
    .dfs-telemetry-deck {
        grid-template-columns: 1fr;
    }
}

.dfs-telemetry-card {
    background: var(--theme-card-bg-subtle, rgba(24, 18, 38, 0.6));
    border: 1px solid var(--theme-border-subtle, rgba(139, 92, 246, 0.2));
    border-radius: 8px;
    padding: 10px 12px;
    display: flex;
    flex-direction: column;
    min-height: 85px;
}

.dfs-card-label {
    font-size: 0.65rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    color: var(--theme-text-sub, #94a3b8);
    text-transform: uppercase;
    margin-bottom: 6px;
}

.dfs-card-header-mini {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 6px;
}

.dfs-badge-counter {
    font-size: 0.68rem;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.06);
    color: var(--theme-accent, #a78bfa);
    border: 1px solid var(--theme-border-subtle, rgba(139, 92, 246, 0.15));
}

.dfs-card-main {
    display: flex;
    align-items: baseline;
    gap: 8px;
    margin-bottom: 4px;
    flex-wrap: wrap;
}

.dfs-node-name {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--theme-text-title, #f8fafc);
}

.dfs-node-role-pill {
    font-size: 0.68rem;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 4px;
    background: var(--theme-glow-soft, rgba(139, 92, 246, 0.15));
    color: var(--theme-accent, #a78bfa);
    border: 1px solid var(--theme-border-subtle, rgba(139, 92, 246, 0.25));
}

.dfs-node-desc {
    margin: 0;
    font-size: 0.72rem;
    color: var(--theme-text-sub, #94a3b8);
    line-height: 1.35;
}

/* LIFO Stack frames display */
.dfs-stack-frames {
    display: flex;
    flex-direction: column;
    gap: 4px;
    max-height: 95px;
    overflow-y: auto;
}

.dfs-empty-stack-msg {
    font-size: 0.72rem;
    color: var(--theme-text-sub, #64748b);
    font-style: italic;
    padding: 4px 0;
}

.dfs-stack-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(0, 0, 0, 0.35);
    border: 1px solid var(--theme-border-subtle, rgba(139, 92, 246, 0.25));
    border-left: 3px solid var(--theme-accent, #a78bfa);
    border-radius: 4px;
    padding: 3px 8px;
    font-size: 0.72rem;
    color: var(--theme-text-title, #e2e8f0);
}

.dfs-stack-item.top-frame {
    border-left-color: #38bdf8;
    background: rgba(56, 189, 248, 0.08);
}

.dfs-stack-depth-tag {
    font-size: 0.62rem;
    font-weight: 700;
    color: var(--theme-text-sub, #94a3b8);
}

/* Visited Nodes set display */
.dfs-visited-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    max-height: 95px;
    overflow-y: auto;
}

.dfs-chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 7px;
    border-radius: 4px;
    font-size: 0.68rem;
    font-weight: 600;
    background: rgba(16, 185, 129, 0.12);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #6ee7b7;
}

.dfs-chip.chip-active {
    background: rgba(59, 130, 246, 0.18);
    border-color: rgba(59, 130, 246, 0.45);
    color: #93c5fd;
}

.dfs-chip.chip-unvisited {
    background: rgba(255, 255, 255, 0.03);
    border-color: rgba(255, 255, 255, 0.1);
    color: var(--theme-text-sub, #64748b);
}

.dfs-chip-icon {
    font-size: 0.7rem;
}

/* Live Event strip */
.dfs-event-strip {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid var(--theme-border-subtle, rgba(139, 92, 246, 0.15));
    border-radius: 6px;
    padding: 6px 10px;
    font-size: 0.72rem;
    color: var(--theme-text-sub, #cbd5e1);
}

.dfs-event-icon {
    color: #fbbf24;
}

.dfs-event-label {
    font-weight: 700;
    color: var(--theme-accent, #a78bfa);
    font-size: 0.65rem;
    letter-spacing: 0.05em;
}

.dfs-event-text {
    color: var(--theme-text-title, #f8fafc);
    font-family: inherit;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* --- 3. Student Branch Choice Modal --- */
.dfs-branch-modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(4, 3, 10, 0.88);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    animation: dfsFadeIn 0.2s ease-out;
}

@keyframes dfsFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.dfs-branch-modal-window {
    width: 100%;
    max-width: 650px;
    background: var(--theme-card-bg, rgba(18, 14, 28, 0.98));
    border: 2px solid var(--theme-primary, #7c3aed);
    border-radius: 14px;
    padding: 24px;
    box-shadow: 0 12px 48px rgba(0, 0, 0, 0.8), 0 0 30px var(--theme-glow, rgba(139, 92, 246, 0.35));
    animation: dfsZoomIn 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes dfsZoomIn {
    from {
        opacity: 0;
        transform: scale(0.92);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.dfs-branch-modal-header {
    text-align: center;
    margin-bottom: 20px;
}

.dfs-modal-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    background: var(--theme-glow-soft, rgba(139, 92, 246, 0.15));
    border: 1px solid var(--theme-border, rgba(139, 92, 246, 0.35));
    color: var(--theme-accent, #a78bfa);
    font-size: 0.7rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 8px;
}

.dfs-modal-title {
    margin: 0 0 8px 0;
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--theme-text-title, #f8fafc);
}

.dfs-modal-subtitle {
    margin: 0;
    font-size: 0.82rem;
    color: var(--theme-text-sub, #94a3b8);
    line-height: 1.45;
}

.dfs-branch-cards-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-top: 16px;
}

@media (max-width: 600px) {
    .dfs-branch-cards-grid {
        grid-template-columns: 1fr;
    }
}

.dfs-branch-card {
    background: var(--theme-card-bg-subtle, rgba(24, 18, 38, 0.8));
    border: 1.5px solid var(--theme-border-subtle, rgba(139, 92, 246, 0.25));
    border-radius: 10px;
    padding: 16px;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    text-align: left;
}

.dfs-branch-card:hover {
    border-color: var(--theme-accent, #a78bfa);
    background: var(--theme-card-bg, rgba(18, 14, 28, 0.95));
    box-shadow: 0 0 20px var(--theme-glow, rgba(139, 92, 246, 0.35));
    transform: translateY(-2px);
}

.dfs-branch-card-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.dfs-branch-icon {
    font-size: 1.25rem;
    color: var(--theme-accent, #a78bfa);
}

.dfs-branch-label {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--theme-text-title, #f8fafc);
}

.dfs-branch-desc {
    font-size: 0.78rem;
    color: var(--theme-text-sub, #94a3b8);
    line-height: 1.4;
    margin: 0 0 12px 0;
}

.dfs-branch-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 10px;
    border-top: 1px solid var(--theme-border-subtle, rgba(139, 92, 246, 0.15));
}

.dfs-branch-subpath {
    font-size: 0.68rem;
    color: var(--theme-accent, #a78bfa);
    font-family: monospace;
}

.dfs-branch-btn-tag {
    font-size: 0.72rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 4px;
    background: var(--theme-btn-gradient, linear-gradient(135deg, #6d28d9 0%, #7c3aed 100%));
    color: #ffffff;
}