:root {
    --bg-color: #f8f9fa;
    --header-bg: #ffffff;
    --text-color: #212529;
    --border-color: #dee2e6;
    --primary-color: #007bff;
    --primary-hover: #0056b3;
    --danger-color: #dc3545;
    --editor-bg: #ffffff;
    --terminal-bg: #1e1e1e;
    --terminal-text: #ffffff;
    --toolbar-bg: #f1f3f5;
    
    /* Syntax Highlighting Light */
    --hl-keyword: #0033cc;
    --hl-command: #006666;
    --hl-string: #228b22;
    --hl-number: #666666;
    --hl-comment: #808080;
    --hl-operator: #cc0000;
    --hl-unknown: #00bfff;
    --hl-userproc: #9933ff;
    --hl-variable: #e67e22;
}

.theme-dark {
    --bg-color: #121212;
    --header-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --border-color: #333333;
    --editor-bg: #1e1e1e;
    --toolbar-bg: #2d2d2d;
    
    --hl-keyword: #bb86fc;
    --hl-command: #03dac6;
    --hl-string: #ffb74d;
    --hl-number: #cf6679;
    --hl-comment: #757575;
    --hl-operator: #ffffff;
    --hl-unknown: #b0bec5;
    --hl-userproc: #d19a66;
    --hl-variable: #ff9800;
}

.theme-monokai {
    --bg-color: #272822;
    --header-bg: #1e1e1e;
    --text-color: #f8f8f2;
    --border-color: #49483e;
    --editor-bg: #272822;
    --toolbar-bg: #3e3d32;
    
    --hl-keyword: #f92672;
    --hl-command: #66d9ef;
    --hl-string: #e6db74;
    --hl-number: #ae81ff;
    --hl-comment: #75715e;
    --hl-operator: #f8f8f2;
    --hl-unknown: #a6e22e;
    --hl-userproc: #e6db74;
    --hl-variable: #fd971f;
}

.theme-solarized {
    --bg-color: #fdf6e3;
    --header-bg: #eee8d5;
    --text-color: #657b83;
    --border-color: #d5c4a1;
    --editor-bg: #fdf6e3;
    --toolbar-bg: #eee8d5;
    
    --hl-keyword: #859900;
    --hl-command: #268bd2;
    --hl-string: #2aa198;
    --hl-number: #d33682;
    --hl-comment: #93a1a1;
    --hl-operator: #586e75;
    --hl-unknown: #cb4b16;
    --hl-userproc: #b58900;
    --hl-variable: #cb4b16;
}

.theme-midnight {
    --bg-color: #00040d;
    --header-bg: #000c1f;
    --text-color: #d1d9e6;
    --border-color: #1a2a44;
    --editor-bg: #00040d;
    --toolbar-bg: #00122e;
    
    --hl-keyword: #ff007f;
    --hl-command: #00d4ff;
    --hl-string: #00ffaa;
    --hl-number: #ffcc00;
    --hl-comment: #506680;
    --hl-operator: #ffffff;
    --hl-unknown: #bf94ff;
    --hl-userproc: #ff8000;
    --hl-variable: #ffcc00;
}

* { box-sizing: border-box; }
body, html { margin: 0; padding: 0; height: 100%; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background: var(--bg-color); color: var(--text-color); overflow: hidden; }

#app { display: flex; flex-direction: column; height: 100vh; min-height: 0; }
.view { display: none; flex: 1; min-height: 0; flex-direction: column; }
.mode-editor #editor-view { display: flex; }
.mode-execution #execution-view { display: flex; }

/* Header */
.main-header { display: flex; justify-content: space-between; align-items: center; padding: 10px 20px; background: var(--header-bg); border-bottom: 1px solid var(--border-color); }
.main-header h1 { margin: 0; font-size: 1.5rem; }
.header-actions { display: flex; gap: 8px; align-items: center; }
.header-actions button, .header-actions a {
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0;
}

.flat-action {
    gap: 7px;
    padding: 0 14px;
    border: 1px solid transparent;
    border-radius: 6px;
    background: transparent;
    color: var(--text-color);
    text-decoration: none;
    font: inherit;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.16s ease, border-color 0.16s ease, color 0.16s ease;
}

.flat-action:hover {
    background: color-mix(in srgb, var(--text-color) 10%, transparent);
    border-color: color-mix(in srgb, var(--text-color) 18%, transparent);
}

.flat-action:active {
    background: color-mix(in srgb, var(--text-color) 16%, transparent);
}

.primary-action {
    background: var(--primary-color);
    color: #fff;
}

.primary-action:hover {
    background: var(--primary-hover);
    border-color: transparent;
}

.icon {
    display: inline-flex;
    min-width: 1.25em;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    line-height: 1;
}

/* Editor View */
.editor-workspace { flex: 1; min-height: 0; display: flex; flex-direction: column; position: relative; }
.toolbar-container { background: var(--toolbar-bg); border-bottom: 1px solid var(--border-color); padding: 5px 20px; }
.toolbar { display: flex; gap: 5px; }
.toolbar button { background: none; border: none; padding: 8px 12px; cursor: pointer; color: var(--text-color); border-radius: 4px; font-size: 1.1rem; }
.toolbar button:hover { background: rgba(0,0,0,0.1); }
.separator { width: 1px; background: var(--border-color); margin: 5px 10px; }

#editor-container { flex: 1; min-height: 0; position: relative; overflow: hidden; background: var(--editor-bg); display: flex; }

#line-numbers {
    width: 40px;
    padding: 20px 5px;
    text-align: right;
    font-family: 'Fira Code', 'Courier New', Courier, monospace;
    font-size: 16px;
    line-height: 1.5;
    color: #888;
    background: var(--toolbar-bg);
    border-right: 1px solid var(--border-color);
    user-select: none;
    overflow: hidden;
}

#codeEditor, #highlighting { 
    margin: 0; 
    padding: 20px;
    padding-left: 10px;
    border: none; 
    width: calc(100% - 40px); 
    height: 100%; 
    font-family: 'Fira Code', 'Courier New', Courier, monospace; 
    font-size: 16px; 
    line-height: 1.5; 
    position: absolute; 
    top: 0; 
    left: 40px; 
    white-space: pre; 
    word-wrap: normal; 
    overflow: auto; 
    tab-size: 2;
    -moz-tab-size: 2;
    font-variant-ligatures: none;
    letter-spacing: normal;
}
#codeEditor { 
    color: transparent; 
    background: transparent; 
    caret-color: var(--text-color); 
    resize: none; 
    z-index: 2; 
    outline: none; 
    -webkit-text-fill-color: transparent;
}
#highlighting { 
    pointer-events: none; 
    z-index: 1; 
    color: var(--text-color); 
}
#highlighting code {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    padding: 0;
    margin: 0;
    background: transparent !important;
}

/* Execution View */
.exec-toolbar { display: flex; flex-direction: column; gap: 5px; padding: 10px 20px; background: var(--header-bg); border-bottom: 1px solid var(--border-color); }
.toolbar-row { display: flex; gap: 10px; align-items: center; }
.inline-cmd-container { flex: 1; display: flex; border: 1px solid var(--border-color); border-radius: 20px; overflow: hidden; background: var(--bg-color); }
.inline-cmd-container input { flex: 1; border: none; padding: 8px 15px; outline: none; background: transparent; color: var(--text-color); }
.inline-cmd-container button { border: none; background: var(--primary-color); color: white; padding: 0 15px; cursor: pointer; }

.canvas-container { flex: 1; min-height: 0; display: flex; justify-content: flex-start; align-items: flex-start; overflow: auto; background: #ddd; padding: 16px; }
.canvas-stage { position: relative; flex: 0 0 auto; margin: auto; }
canvas { position: absolute; top: 0; left: 0; background: white; box-shadow: 0 0 20px rgba(0,0,0,0.2); }
#turtleLayer { background: transparent; box-shadow: none; pointer-events: none; }

.terminal-popup { position: absolute; right: 20px; bottom: 54px; z-index: 120; width: min(640px, calc(100vw - 40px)); height: min(260px, calc(100vh - 180px)); display: flex; flex-direction: column; background: var(--terminal-bg); color: var(--terminal-text); border: 1px solid #555; border-radius: 6px; box-shadow: 0 10px 28px rgba(0,0,0,0.35); overflow: hidden; }
.terminal-header { display: flex; justify-content: space-between; align-items: center; padding: 5px 15px; background: #333; font-size: 0.9rem; }
#terminalOutput { flex: 1; padding: 10px; overflow-y: auto; font-family: 'Courier New', Courier, monospace; font-size: 14px; }
.terminal-msg { margin-bottom: 4px; }
.terminal-error { color: #ff5f56; }
.terminal-warn { color: #ffbd2e; }

#showTerminalBtn { position: absolute; bottom: 10px; right: 20px; z-index: 100; background: #333; color: white; border: none; padding: 7px 15px; border-radius: 4px; cursor: pointer; }

/* Common UI */
button.primary { background: var(--primary-color); color: white; border: none; height: 38px; padding: 0 16px; border-radius: 4px; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; }
button.primary:hover { background: var(--primary-hover); }
button.danger { background: var(--danger-color); color: white; border: none; height: 38px; padding: 0 16px; border-radius: 4px; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; }

.exec-btn {
    height: 38px;
    min-width: 100px;
}

.status-bar {
    flex: 1;
    display: flex;
    gap: 15px;
    margin-left: 20px;
    padding: 0 15px;
    background: var(--bg-color);
    border-radius: 4px;
    border: 1px solid var(--border-color);
    height: 38px;
    align-items: center;
    font-size: 0.85rem;
    overflow-x: auto;
    white-space: nowrap;
}

.status-item {
    display: flex;
    align-items: center;
    gap: 5px;
}

.color-preview {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 2px;
    border: 1px solid rgba(0,0,0,0.1);
}

.hidden { display: none !important; }

/* Modal */
.modal { position: fixed; z-index: 1000; left: 0; top: 0; width: 100%; height: 100%; background-color: rgba(0,0,0,0.5); display: flex; align-items: center; justify-content: center; }
.modal-content { background: var(--header-bg); padding: 0; border-radius: 8px; width: 400px; max-height: min(720px, calc(100vh - 32px)); display: flex; flex-direction: column; box-shadow: 0 5px 15px rgba(0,0,0,0.3); border: 1px solid var(--border-color); }
.modal-header { display: flex; justify-content: space-between; align-items: center; padding: 15px 20px; border-bottom: 1px solid var(--border-color); }
.modal-header h2 { margin: 0; font-size: 1.2rem; }
.close-modal, .close-examples-modal { width: 34px; height: 34px; display: inline-flex; align-items: center; justify-content: center; background: transparent; border: none; border-radius: 6px; font-size: 1.5rem; cursor: pointer; color: var(--text-color); }
.close-modal:hover, .close-examples-modal:hover { background: color-mix(in srgb, var(--text-color) 10%, transparent); }
.modal-body { padding: 20px; overflow: auto; }
.setting-item { display: flex; justify-content: space-between; align-items: center; margin-bottom: 15px; }
.setting-item label { font-weight: 500; }
.setting-item select, .setting-item input { padding: 5px; border-radius: 4px; border: 1px solid var(--border-color); background: var(--bg-color); color: var(--text-color); }

.examples-modal-content {
    width: min(520px, calc(100vw - 24px));
}

.examples-list {
    display: grid;
    gap: 8px;
}

.example-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-color);
    color: var(--text-color);
    cursor: pointer;
    text-align: left;
    transition: background-color 0.16s ease, border-color 0.16s ease;
}

.example-item:hover {
    background: color-mix(in srgb, var(--primary-color) 12%, var(--bg-color));
    border-color: color-mix(in srgb, var(--primary-color) 48%, var(--border-color));
}

.example-item span {
    font-weight: 700;
}

.example-item small {
    max-width: 45%;
    color: color-mix(in srgb, var(--text-color) 65%, transparent);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Syntax Colors */
.hl-keyword { color: var(--hl-keyword); font-weight: bold; text-decoration: none; }
.hl-command { color: var(--hl-command); font-weight: bold; text-decoration: none; }
.hl-string { color: var(--hl-string); }
.hl-number { color: var(--hl-number); }
.hl-comment { color: var(--hl-comment); font-style: italic; }
.hl-operator { color: var(--hl-operator); }
.hl-unknown { color: var(--hl-unknown); }
.hl-userproc { color: var(--hl-userproc); font-weight: bold; }
.hl-variable { color: var(--hl-variable); font-weight: bold; }

@media (max-width: 900px) {
    .main-header {
        align-items: flex-start;
        flex-direction: column;
        gap: 10px;
        padding: 10px 12px;
    }

    .main-header h1 {
        font-size: 1.25rem;
    }

    .header-actions {
        width: 100%;
        gap: 8px;
        overflow-x: auto;
        padding-bottom: 2px;
    }

    .toolbar-container,
    .exec-toolbar {
        padding-left: 10px;
        padding-right: 10px;
    }

    .toolbar {
        overflow-x: auto;
        padding-bottom: 2px;
    }

    .toolbar button {
        min-width: 38px;
        padding: 8px 10px;
    }

    .toolbar-row {
        align-items: stretch;
        flex-wrap: wrap;
    }

    .status-bar {
        flex-basis: 100%;
        margin-left: 0;
        min-width: 0;
    }

    .inline-cmd-container {
        flex-basis: 100%;
    }

    .terminal-popup {
        height: 220px;
    }
}

@media (max-width: 560px) {
    .header-actions button,
    .header-actions a,
    .exec-btn {
        min-width: max-content;
    }

    #line-numbers {
        width: 34px;
        font-size: 14px;
        padding-top: 14px;
    }

    #codeEditor,
    #highlighting {
        left: 34px;
        width: calc(100% - 34px);
        padding: 14px 10px 14px 8px;
        font-size: 14px;
    }

    .separator {
        margin-left: 4px;
        margin-right: 4px;
    }

    .modal-content {
        width: calc(100vw - 24px);
    }

    .setting-item {
        align-items: flex-start;
        flex-direction: column;
        gap: 6px;
    }

    .setting-item select,
    .setting-item input {
        width: 100%;
    }

    .canvas-container {
        min-height: 260px;
    }

    .terminal-popup {
        left: 10px;
        right: 10px;
        bottom: 52px;
        width: auto;
        height: 190px;
    }

    #terminalOutput {
        font-size: 12px;
    }
}

.toolbar .icon svg {
    display: block;
    vertical-align: middle;
    /*color: #333;  ou var(--icon-color) */
    transition: color 0.2s;
}

.toolbar button:hover .icon svg {
    color: #6666ff;
}

.toolbar button:disabled .icon svg {
    opacity: 0.4;
}

.help-button .icon {
    font-size: 16px;
}