/* ======================================================================
   DCCPS Playground — IDE-style layout
   Sidebar | Editor | Output (side-by-side, resizable).
   No external fonts/icons beyond the site's existing stack.
   ~8KB total uncompressed.
   ====================================================================== */

:root {
    --ide-bg:      #0e1320;
    --ide-bg-2:    #131a2b;
    --ide-bg-3:    #1a2237;
    --ide-fg:      #e6e9f2;
    --ide-fg-mute: #9aa3b6;
    --ide-border:  #1f2a44;
    --ide-accent:  #5b8cff;
    --ide-accent2: #8b5cf6;
    --ide-ok:      #34d399;
    --ide-err:     #f87171;
    --ide-warn:    #fbbf24;
    --ide-info:    #60a5fa;
    --ide-mono:    'JetBrains Mono','Fira Code','SFMono-Regular',Menlo,Monaco,Consolas,monospace;
}

[data-theme="light"] {
    --ide-bg:      #ffffff;
    --ide-bg-2:    #f8fafc;
    --ide-bg-3:    #eef2f7;
    --ide-fg:      #0f172a;
    --ide-fg-mute: #64748b;
    --ide-border:  #e2e8f0;
}

/* ============ Container — fills viewport below navbar ============
   Site navbar height = var(--nav-h) ≈ 76px and is `position:sticky`,
   so we just let normal flow place us right under it. No negative
   margins (those clipped the top bar under the navbar previously). */
.ide {
    --ide-side-w: 280px;
    --ide-editor-w: 1fr;
    --ide-output-w: 1fr;
    --ide-topbar-h: 56px;

    display: flex; flex-direction: column;
    height: calc(100vh - var(--nav-h, 76px));
    height: calc(100svh - var(--nav-h, 76px));   /* iOS-safe viewport */
    min-height: 560px;
    background: var(--ide-bg);
    color: var(--ide-fg);
    border-top: 1px solid var(--ide-border);
}

/* ============ TOP BAR ============ */
.ide-topbar {
    height: var(--ide-topbar-h);
    flex: 0 0 auto;
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 1rem; gap: 1rem;
    background: var(--ide-bg-2);
    border-bottom: 1px solid var(--ide-border);
}
.ide-brand {
    display: flex; align-items: center; gap: .55rem;
    font-weight: 700; font-size: .95rem; color: var(--ide-fg);
}
.ide-brand i { color: var(--ide-accent); font-size: 1.1rem; }
.ide-file {
    font-size: .76rem; font-weight: 500; color: var(--ide-fg-mute);
    margin-left: .5rem; padding: .15rem .55rem;
    background: var(--ide-bg-3); border-radius: 999px;
}
.ide-toolbar { display: flex; align-items: center; gap: .5rem; }

.ide-select {
    background: var(--ide-bg-3); color: var(--ide-fg);
    border: 1px solid var(--ide-border); border-radius: 8px;
    padding: .42rem .65rem; font-size: .85rem; font-weight: 500;
    min-width: 150px; cursor: pointer;
    transition: border-color .15s;
}
.ide-select:focus { outline: 0; border-color: var(--ide-accent); }

.ide-tool-group { display: flex; gap: 2px; }
.ide-tool {
    background: transparent; color: var(--ide-fg-mute);
    border: 0; border-radius: 6px; padding: 7px 9px;
    cursor: pointer; transition: background .15s, color .15s;
}
.ide-tool:hover { background: var(--ide-bg-3); color: var(--ide-fg); }

.ide-run {
    display: inline-flex; align-items: center; gap: .35rem;
    background: linear-gradient(180deg, var(--ide-accent), #4470e0);
    color: #fff; border: 0; border-radius: 8px;
    padding: .45rem .9rem; font-weight: 600; font-size: .88rem;
    cursor: pointer; box-shadow: 0 1px 2px rgba(91,140,255,.5), inset 0 1px 0 rgba(255,255,255,.16);
    transition: filter .12s, transform .06s;
}
.ide-run:hover  { filter: brightness(1.08); }
.ide-run:active { transform: translateY(1px); }
.ide-run kbd {
    background: rgba(255,255,255,.18); color: #fff;
    padding: 0 .35rem; border-radius: 4px;
    font-size: .72rem; font-family: var(--ide-mono);
}

/* ============ GRID — sidebar | editor | resizer | output ============ */
.ide-grid {
    flex: 1 1 auto;
    display: grid;
    grid-template-columns: var(--ide-side-w) minmax(0, var(--ide-editor-w)) 6px minmax(0, var(--ide-output-w));
    min-height: 0;
}
.ide-grid.side-collapsed { grid-template-columns: 0 minmax(0, var(--ide-editor-w)) 6px minmax(0, var(--ide-output-w)); }

/* ============ SIDEBAR ============ */
.ide-side {
    background: var(--ide-bg-2);
    border-right: 1px solid var(--ide-border);
    display: flex; flex-direction: column;
    overflow: hidden;
    min-width: 0;
    transition: opacity .15s;
}
.ide-grid.side-collapsed .ide-side { opacity: 0; pointer-events: none; }

.ide-side-head {
    display: flex; align-items: center; justify-content: space-between;
    padding: .75rem 1rem; border-bottom: 1px solid var(--ide-border);
    font-size: .82rem; font-weight: 700; letter-spacing: .03em;
    text-transform: uppercase; color: var(--ide-fg-mute);
}
.ide-side-head i { color: var(--ide-warn); margin-right: .35rem; }
.ide-side-toggle {
    background: transparent; border: 0; color: var(--ide-fg-mute);
    cursor: pointer; padding: 4px 6px; border-radius: 4px;
    transition: background .15s;
}
.ide-side-toggle:hover { background: var(--ide-bg-3); color: var(--ide-fg); }

.ide-side-filters {
    padding: .65rem .75rem; display: flex; flex-direction: column; gap: .4rem;
    border-bottom: 1px solid var(--ide-border);
}
.ide-mini-select {
    background: var(--ide-bg-3); color: var(--ide-fg);
    border: 1px solid var(--ide-border); border-radius: 6px;
    padding: .35rem .5rem; font-size: .8rem; cursor: pointer;
}
.ide-mini-select:focus { outline: 0; border-color: var(--ide-accent); }

.ide-snip-list { flex: 1 1 auto; overflow-y: auto; padding: .35rem .35rem 1rem; }
.ide-snip-list::-webkit-scrollbar { width: 8px; }
.ide-snip-list::-webkit-scrollbar-thumb { background: var(--ide-border); border-radius: 4px; }

.ide-snip {
    width: 100%; display: grid;
    grid-template-columns: 6px 1fr; gap: .55rem;
    align-items: center;
    background: transparent; color: var(--ide-fg);
    border: 0; border-radius: 8px; padding: .5rem .65rem; margin: 1px 0;
    cursor: pointer; text-align: left;
    transition: background .12s, transform .08s;
}
.ide-snip:hover { background: var(--ide-bg-3); transform: translateX(2px); }
.ide-snip.is-active { background: linear-gradient(90deg, rgba(91,140,255,.18), transparent); }
.ide-snip-dot {
    width: 6px; height: 6px; border-radius: 50%; background: var(--ide-accent);
    box-shadow: 0 0 0 3px rgba(91,140,255,.12);
}
.ide-snip-main { min-width: 0; display: flex; flex-direction: column; gap: 1px; }
.ide-snip-title { font-size: .85rem; font-weight: 500; color: var(--ide-fg); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ide-snip-meta  { font-size: .72rem; color: var(--ide-fg-mute); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.ide-empty { padding: 2rem 1rem; text-align: center; color: var(--ide-fg-mute); }
.ide-empty i { font-size: 1.8rem; opacity: .4; display: block; margin-bottom: .4rem; }

/* Floating "open sidebar" button — visible only when collapsed */
.ide-side-open {
    position: absolute; top: calc(var(--ide-topbar-h) + 12px); left: 10px; z-index: 5;
    background: var(--ide-bg-3); color: var(--ide-fg);
    border: 1px solid var(--ide-border); border-radius: 8px;
    padding: 8px 10px; cursor: pointer;
    box-shadow: 0 2px 6px rgba(0,0,0,.3);
}
.ide-side-open:hover { background: var(--ide-accent); border-color: var(--ide-accent); color: #fff; }

/* ============ EDITOR PANE ============ */
.ide-editor-pane,
.ide-output-pane {
    display: flex; flex-direction: column;
    background: var(--ide-bg);
    min-width: 0; min-height: 0;
    overflow: hidden;
}
.ide-editor-pane { border-right: 1px solid var(--ide-border); }

.ide-pane-head {
    flex: 0 0 auto;
    display: flex; align-items: center; justify-content: space-between;
    padding: .35rem .6rem;
    background: var(--ide-bg-2);
    border-bottom: 1px solid var(--ide-border);
    min-height: 38px;
}
.ide-tab {
    display: inline-flex; align-items: center; gap: .5rem;
    padding: .35rem .8rem;
    background: var(--ide-bg);
    border: 1px solid var(--ide-border);
    border-radius: 6px 6px 0 0;
    font-size: .82rem; color: var(--ide-fg);
    border-bottom-color: var(--ide-bg);
    margin-bottom: -1px;
}
.ide-tab.is-active { color: var(--ide-fg); font-weight: 500; }
.ide-tab-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--ide-accent); }
.ide-tab i { color: var(--ide-info); }

.ide-pane-action {
    background: transparent; color: var(--ide-fg-mute);
    border: 0; border-radius: 6px; padding: 5px 9px;
    cursor: pointer; font-size: .78rem;
    display: inline-flex; align-items: center; gap: .35rem;
    transition: background .12s, color .12s;
}
.ide-pane-action:hover { background: var(--ide-bg-3); color: var(--ide-fg); }

.ide-editor-host {
    flex: 1 1 auto;
    display: grid;
    grid-template-columns: 52px 1fr;
    min-height: 0;
    font-family: var(--ide-mono);
    background: var(--ide-bg);
}
.ide-gutter {
    background: var(--ide-bg);
    color: var(--ide-fg-mute);
    padding: 14px 10px 14px 10px; text-align: right;
    font-size: .82rem; line-height: 1.55;
    white-space: pre; user-select: none;
    border-right: 1px solid var(--ide-border);
    overflow: hidden;
}
.ide-editor {
    background: var(--ide-bg);
    color: var(--ide-fg);
    border: 0; outline: 0;
    padding: 14px;
    font-family: var(--ide-mono);
    font-size: .9rem;
    line-height: 1.55;
    width: 100%; height: 100%;
    resize: none; tab-size: 4;
    white-space: pre; overflow: auto;
    caret-color: var(--ide-accent);
}
.ide-editor::-webkit-scrollbar { width: 10px; height: 10px; }
.ide-editor::-webkit-scrollbar-thumb { background: var(--ide-border); border-radius: 5px; }

/* Stdin drawer */
.ide-stdin {
    flex: 0 0 auto;
    border-top: 1px solid var(--ide-border);
    background: var(--ide-bg-2);
    padding: .55rem .75rem .75rem;
}
.ide-stdin-label {
    display: flex; align-items: center; gap: .35rem;
    font-size: .75rem; color: var(--ide-fg-mute);
    margin-bottom: .35rem; text-transform: uppercase; letter-spacing: .04em;
}
.ide-stdin-label i { color: var(--ide-warn); }
.ide-stdin-area {
    width: 100%;
    background: var(--ide-bg); color: var(--ide-fg);
    border: 1px solid var(--ide-border); border-radius: 6px;
    padding: .5rem .65rem;
    font-family: var(--ide-mono); font-size: .82rem;
    resize: vertical;
}
.ide-stdin-area:focus { outline: 0; border-color: var(--ide-accent); }

/* ============ RESIZER ============ */
.ide-resizer {
    background: var(--ide-border);
    cursor: col-resize;
    transition: background .15s;
    position: relative;
}
.ide-resizer::before {
    content: ''; position: absolute; inset: 0 -4px;   /* widen hit area */
}
.ide-resizer:hover, .ide-resizer.is-drag { background: var(--ide-accent); }

/* ============ OUTPUT PANE ============ */
.ide-output {
    flex: 1 1 auto;
    background: var(--ide-bg);
    color: var(--ide-fg);
    margin: 0; padding: 14px;
    font-family: var(--ide-mono); font-size: .87rem; line-height: 1.55;
    overflow: auto; white-space: pre-wrap; word-break: break-word;
    min-height: 0;
}
.ide-output::-webkit-scrollbar { width: 10px; }
.ide-output::-webkit-scrollbar-thumb { background: var(--ide-border); border-radius: 5px; }
.ide-out-ok   { color: var(--ide-ok); }
.ide-out-err  { color: var(--ide-err); }
.ide-out-meta { color: var(--ide-fg-mute); font-style: italic; }
.ide-out-meta kbd {
    background: var(--ide-bg-3); color: var(--ide-fg);
    padding: 1px 6px; border-radius: 4px;
    font-family: var(--ide-mono); font-size: .78rem;
    border: 1px solid var(--ide-border);
}

/* Output badges */
.ide-badge {
    font-size: .68rem; font-weight: 700; text-transform: uppercase;
    padding: 2px 8px; border-radius: 999px; letter-spacing: .04em;
    background: var(--ide-bg-3); color: var(--ide-fg-mute);
    margin-left: .35rem;
}
.ide-badge-idle { background: rgba(154,163,182,.15); color: #9aa3b6; }
.ide-badge-run  { background: rgba(251,191,36,.18); color: var(--ide-warn); }
.ide-badge-ok   { background: rgba(52,211,153,.16); color: var(--ide-ok); }
.ide-badge-err  { background: rgba(248,113,113,.16); color: var(--ide-err); }
.ide-badge-tout { background: rgba(248,113,113,.16); color: var(--ide-err); }
.ide-badge-off  { background: rgba(154,163,182,.15); color: #9aa3b6; }
.ide-badge-run::before {
    content: ''; display: inline-block; width: 6px; height: 6px;
    background: currentColor; border-radius: 50%;
    margin-right: 5px; animation: pulse 1s infinite;
}
@keyframes pulse {
    0%, 100% { opacity: .35; transform: scale(.9); }
    50%      { opacity: 1;   transform: scale(1.1); }
}

/* Status bar (bottom of output pane) */
.ide-statusbar {
    flex: 0 0 auto;
    display: flex; align-items: center; gap: 1.2rem;
    padding: .35rem .75rem;
    background: var(--ide-bg-2); color: var(--ide-fg-mute);
    border-top: 1px solid var(--ide-border);
    font-size: .72rem; font-family: var(--ide-mono);
    min-height: 28px;
}
.ide-stat-item { display: inline-flex; align-items: center; gap: .35rem; }
.ide-stat-item i { color: var(--ide-info); }

/* ============ MOBILE tab bar (≤900px) — show only one panel ============
   On desktop everything is side-by-side. On mobile we show ONE panel at a
   time via tabs, swapping based on [data-mobile-tab] attribute. */
.ide-mtabs { display: none; }
.ide-fab-run { display: none; }

@media (max-width: 900px) {
    .ide { height: auto; min-height: calc(100svh - var(--nav-h, 76px)); }

    /* hide the desktop "Run" — phantom space taker; use floating Run instead */
    .ide-toolbar .ide-run { display: none; }
    .ide-toolbar .ide-tool-group { display: none; }
    .ide-toolbar { gap: .35rem; }
    .ide-toolbar .ide-select { min-width: 0; flex: 1; font-size: .82rem; }
    .ide-topbar { padding: 0 .65rem; gap: .55rem; }
    .ide-brand span { display: none; }
    .ide-brand .ide-file { margin-left: 0; }

    /* Mobile tabs */
    .ide-mtabs {
        display: flex;
        background: var(--ide-bg-2);
        border-bottom: 1px solid var(--ide-border);
        padding: .25rem .25rem 0;
        gap: 2px;
        flex: 0 0 auto;
    }
    .ide-mtab {
        flex: 1; display: inline-flex; align-items: center; justify-content: center;
        gap: .35rem; padding: .55rem .35rem;
        background: transparent; border: 0;
        color: var(--ide-fg-mute); font-size: .82rem; font-weight: 500;
        border-bottom: 2px solid transparent;
        cursor: pointer; transition: color .15s, border-color .15s, background .15s;
    }
    .ide-mtab i { font-size: 1rem; }
    .ide-mtab:hover { color: var(--ide-fg); background: rgba(255,255,255,.03); }
    .ide-mtab.is-active {
        color: var(--ide-accent);
        border-bottom-color: var(--ide-accent);
        background: var(--ide-bg);
    }
    .ide-mtab-badge {
        background: var(--ide-err); color: #fff;
        font-size: .65rem; padding: 1px 6px;
        border-radius: 999px; margin-left: .15rem;
    }

    /* Grid → stack columns; visibility based on data-mobile-tab */
    .ide-grid {
        grid-template-columns: 1fr;
        flex: 1 1 auto; min-height: 0; position: relative;
    }
    .ide-side, .ide-editor-pane, .ide-output-pane {
        grid-column: 1; grid-row: 1;
        min-height: 0; height: 100%; min-width: 0;
        border-right: 0;
    }
    .ide-resizer, .ide-side-open, .ide-side-head .ide-side-toggle { display: none; }

    /* Show only one pane at a time, based on parent's data-mobile-tab */
    .ide[data-mobile-tab="code"]     .ide-editor-pane { display: flex; }
    .ide[data-mobile-tab="code"]     .ide-output-pane,
    .ide[data-mobile-tab="code"]     .ide-side          { display: none; }

    .ide[data-mobile-tab="output"]   .ide-output-pane { display: flex; }
    .ide[data-mobile-tab="output"]   .ide-editor-pane,
    .ide[data-mobile-tab="output"]   .ide-side          { display: none; }

    .ide[data-mobile-tab="examples"] .ide-side         { display: flex; }
    .ide[data-mobile-tab="examples"] .ide-editor-pane,
    .ide[data-mobile-tab="examples"] .ide-output-pane   { display: none; }

    /* Floating Run — pinned bottom-right */
    .ide-fab-run {
        display: flex; align-items: center; justify-content: center;
        position: fixed; bottom: 16px; right: 16px; z-index: 30;
        width: 56px; height: 56px; border-radius: 50%; border: 0;
        background: linear-gradient(180deg, var(--ide-accent), #4470e0);
        color: #fff; font-size: 1.5rem;
        box-shadow: 0 10px 24px -6px rgba(91,140,255,.6), 0 2px 6px rgba(0,0,0,.2);
        cursor: pointer; transition: transform .12s, filter .12s;
    }
    .ide-fab-run:hover  { filter: brightness(1.05); }
    .ide-fab-run:active { transform: scale(.94); }
    .ide-fab-run.is-running {
        background: linear-gradient(180deg, var(--ide-warn), #d97706);
        animation: pulseBig 1.1s infinite;
    }
    @keyframes pulseBig {
        0%, 100% { box-shadow: 0 10px 24px -6px rgba(251,191,36,.6); }
        50%      { box-shadow: 0 12px 28px -4px rgba(251,191,36,.85); }
    }

    /* Sidebar fills its panel on mobile */
    .ide-side       { max-height: none; border-top: 0; }
    .ide-side-head  { padding: .65rem .9rem; }
    .ide-side-filters { padding: .55rem .65rem; }
    .ide-snip-list  { padding-bottom: 100px; }   /* room for FAB */

    /* Editor + output panes full height */
    .ide-editor-pane, .ide-output-pane { min-height: 0; }
    .ide-output { min-height: 200px; max-height: none; }
    .ide-output, .ide-editor { padding: 10px 12px; }
    .ide-statusbar { font-size: .68rem; gap: .8rem; }
}

@media (max-width: 480px) {
    .ide-mtab span { display: none; }   /* icon-only tabs on tiny screens */
    .ide-toolbar .ide-select { font-size: .78rem; padding: .35rem .45rem; }
    .ide-topbar .ide-file { display: none; }
}