:root {
    --bg: #eef0f2;
    --bg-alt: #ffffff;
    --ink: #111111;
    --ink-muted: #3a3a3a;
    --panel: #ffffff;
    --line: #c8cdd2;
    --accent: #0078d4;
    --accent-strong: #005ea6;
    --warn: #9b1c1c;
    --ok: #1f7a3d;
    --shadow: 0 10px 30px rgba(31, 35, 40, 0.12);
    --terminal-bg: #ffffff;
    --terminal-fg: #111111;
    --terminal-cursor: #111111;
    --editor-bg: #ffffff;
    --editor-fg: #111111;
}

body.dark-theme {
    --bg: #1f2226;
    --bg-alt: #2a2e33;
    --ink: #f5f6f8;
    --ink-muted: #c7ccd2;
    --panel: #2a2e33;
    --line: #3b4149;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.28);
    --terminal-bg: #0d0f12;
    --terminal-fg: #f5f6f8;
    --terminal-cursor: #f5f6f8;
    --editor-bg: #282c34;
    --editor-fg: #abb2bf;
}


* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    height: 100%;
}

body {
    font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
    color: var(--ink);
    background: var(--bg);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.sr-only:focus,
.sr-only:active {
    position: static;
    width: auto;
    height: auto;
    margin: 0;
    overflow: visible;
    clip: auto;
    white-space: normal;
    padding: 8px 10px;
    border: 1px solid var(--accent-strong);
    border-radius: 8px;
    background: var(--panel);
    color: var(--ink);
}

.app-shell {
    min-height: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.topbar {
    background: var(--panel);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    border-radius: 12px;
    padding: 10px 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.topbar h1 {
    margin: 0;
    font-size: 1.4rem;
    letter-spacing: 0.01em;
}

.topbar p {
    margin: 3px 0 0;
    color: var(--ink-muted);
    font-size: 0.9rem;
}

.topbar-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

#about-btn {
    font-weight: 800;
    font-size: 1.1rem;
    line-height: 1;
}

.template-label {
    font-size: 0.95rem;
    color: #ffffff;
    font-weight: 600;
}

.template-picker {
    display: flex;
    align-items: center;
    gap: 6px;
    background: var(--accent);
    border: 1px solid var(--accent-strong);
    border-radius: 9px;
    padding: 4px 7px;
    min-height: 36px;
}

#template-select {
    border: 1px solid rgba(255, 255, 255, 0.45);
    border-radius: 7px;
    padding: 6px 8px;
    background: #ffffff;
    color: #111111;
    font-size: 0.9rem;
}

#template-select option {
    color: #111111;
    background: #ffffff;
}

#template-select:focus {
    outline: 2px solid rgba(255, 255, 255, 0.6);
    outline-offset: 1px;
}

#template-select:focus-visible {
    outline: 3px solid #ffffff;
    outline-offset: 1px;
    box-shadow: 0 0 0 3px rgba(0, 120, 212, 0.35);
}

button {
    border: 1px solid var(--accent-strong);
    border-radius: 9px;
    min-width: 38px;
    min-height: 36px;
    padding: 7px 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 120ms ease, background-color 120ms ease;
    background: var(--accent);
    color: #ffffff;
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

button:not(:disabled):active {
    transform: translateY(1px);
}

#run-btn {
    background: var(--accent);
    color: #ffffff;
}

#run-btn:hover:not(:disabled) {
    background: var(--accent-strong);
}

button.secondary {
    background: var(--accent);
    color: #ffffff;
    border-color: var(--accent-strong);
}

button.secondary:hover:not(:disabled) {
    background: var(--accent-strong);
}

button:focus-visible {
    outline: 3px solid #ffffff;
    outline-offset: 2px;
    box-shadow: 0 0 0 3px rgba(0, 120, 212, 0.35);
}

.status-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.status-pill {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 5px 10px;
    font-size: 0.82rem;
    color: var(--ink-muted);
}

.status-pill.ready {
    border-color: rgba(30, 106, 53, 0.35);
    color: var(--ok);
}

.status-pill.error {
    border-color: rgba(143, 45, 31, 0.35);
    color: var(--warn);
}

.workspace {
    --editor-size: minmax(180px, 1fr);
    --terminal-size: minmax(180px, 1fr);
    display: grid;
    grid-template-rows: var(--editor-size) 12px var(--terminal-size);
    gap: 10px;
    height: clamp(500px, calc(100vh - 180px), 760px);
}

.pane-splitter {
    border-radius: 999px;
    border: 1px solid var(--accent-strong);
    background: var(--accent);
    box-shadow: var(--shadow);
    cursor: row-resize;
    touch-action: none;
    user-select: none;
}

.pane-splitter:focus,
.pane-splitter:focus-visible {
    outline: 2px solid rgba(0, 120, 212, 0.4);
    outline-offset: 2px;
}

#editor-container:focus,
#editor-container:focus-visible,
#terminal-container:focus,
#terminal-container:focus-visible {
    outline: 3px solid rgba(0, 120, 212, 0.55);
    outline-offset: -3px;
}

body.dark-theme button:focus-visible,
body.dark-theme #template-select:focus-visible {
    outline-color: #84f0ad;
    box-shadow: 0 0 0 3px rgba(132, 240, 173, 0.28);
}

body.dark-theme #editor-container:focus,
body.dark-theme #editor-container:focus-visible,
body.dark-theme #terminal-container:focus,
body.dark-theme #terminal-container:focus-visible {
    outline-color: rgba(132, 240, 173, 0.75);
}

.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(8, 12, 18, 0.55);
    display: grid;
    place-items: center;
    padding: 16px;
    z-index: 1000;
}

.modal-backdrop[hidden] {
    display: none !important;
}

.modal-card {
    width: min(640px, 100%);
    background: var(--panel);
    color: var(--ink);
    border: 1px solid var(--line);
    border-radius: 12px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.modal-header {
    padding: 12px 14px;
    border-bottom: 1px solid var(--line);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.modal-header h2 {
    margin: 0;
    font-size: 1.05rem;
}

.modal-body {
    padding: 14px;
    display: grid;
    gap: 10px;
}

.modal-body p {
    margin: 0;
    line-height: 1.5;
    color: var(--ink);
}

body.dark-theme .modal-backdrop {
    background: rgba(3, 6, 10, 0.7);
}

.modal-card:focus,
.modal-card:focus-visible {
    outline: 3px solid rgba(0, 120, 212, 0.55);
    outline-offset: 2px;
}

body.dark-theme .modal-card:focus,
body.dark-theme .modal-card:focus-visible {
    outline-color: rgba(132, 240, 173, 0.75);
}

.pane-splitter.dragging {
    background: var(--accent-strong);
}

.panel {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 12px;
    box-shadow: var(--shadow);
    min-height: 0;
    display: flex;
    flex-direction: column;
}

.panel-header {
    border-bottom: 1px solid var(--line);
    padding: 10px 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.panel-header h2 {
    margin: 0;
    font-size: 1rem;
}

.panel-header span {
    color: var(--ink-muted);
    font-size: 0.86rem;
}

.panel-body {
    min-height: 0;
    height: 100%;
    overflow: auto;
}

.panel-terminal .panel-body {
    overflow: hidden;
}

#editor-container,
#terminal-container {
    height: 100%;
    overflow: auto;
}

#editor-container {
    background: var(--editor-bg);
    color: var(--editor-fg);
}

#editor-container .cm-gutters {
    border-right-color: var(--line) !important;
}

#editor-container > * {
    height: 100%;
    min-height: 0;
}

#editor-container button[title*="run" i],
#editor-container button[aria-label*="run" i],
#editor-container [role="button"][title*="run" i],
#editor-container [role="button"][aria-label*="run" i] {
    display: none !important;
}

#terminal-container {
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 0;
    overflow: hidden;
    background: var(--terminal-bg);
    color: var(--terminal-fg);
}

#terminal-container > * {
    flex: 1 1 auto;
    height: 100%;
    min-height: 0;
}

#terminal-container .xterm,
#terminal-container .xterm-screen,
#terminal-container .xterm-viewport {
    height: 100% !important;
}

#terminal-container .xterm,
#terminal-container .xterm-viewport,
#terminal-container .xterm-screen,
#terminal-container .xterm-rows {
    background: var(--terminal-bg) !important;
    color: var(--terminal-fg) !important;
}

#terminal-container .xterm-cursor,
#terminal-container .xterm-cursor-outline,
#terminal-container .xterm-cursor-block {
    background-color: var(--terminal-cursor) !important;
    border-color: var(--terminal-cursor) !important;
}

#terminal-container .xterm-cursor-underline {
    border-bottom-color: var(--terminal-cursor) !important;
}

#terminal-container .xterm-cursor-bar {
    border-left-color: var(--terminal-cursor) !important;
}

body.dark-theme .status-pill {
    background: #25292f;
}

body.dark-theme #template-select {
    background: #000000;
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.4);
}

body.dark-theme #template-select option,
body.dark-theme #template-select optgroup {
    background: #000000;
    color: #ffffff;
}

body.dark-theme .status-pill.ready {
    background: #1f3a2a;
    border-color: rgba(132, 240, 173, 0.55);
    color: #84f0ad;
}

#terminal-container .xterm-viewport {
    overflow-y: auto !important;
}

@media (max-width: 900px) {
    .topbar {
        flex-direction: column;
        align-items: flex-start;
    }

    .topbar-controls {
        flex-wrap: wrap;
    }

    .workspace {
        height: clamp(420px, calc(100vh - 260px), 640px);
    }
}

@media (max-width: 680px) {
    .app-shell {
        padding: 8px;
    }

    .workspace {
        --editor-size: minmax(160px, 1fr);
        --terminal-size: minmax(160px, 1fr);
        height: clamp(380px, calc(100vh - 300px), 560px);
    }
}