/* ===================================================
   JSON Tools by KearAI — Professional Stylesheet v2.0
   Multi-theme, horizontal toolbar, 2-pane workspace,
   hamburger mobile menu, conversion/tools dropdowns.
   =================================================== */

/* ═══════ Theme: Dark (default) ═══════ */
:root,
[data-theme="dark"] {
    --font-sans: 'Manrope', 'Segoe UI', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', Consolas, 'Courier New', monospace;
    --bg: #0d1117; --bg-surface: #161b22; --bg-panel: #1c2129;
    --bg-toolbar: #21262d; --bg-hover: #2d333b; --bg-input: #0d1117;
    --border: #30363d; --border-soft: #3d444d;
    --text: #e6edf3; --text-muted: #8b949e; --text-subtle: #c9d1d9;
    --accent: #58a6ff; --accent-hover: #79b8ff; --accent-active: #388bfd;
    --btn-fg: #c9d1d9; --btn-bg: #21262d; --btn-hover: #30363d;
    --btn-active-bg: #58a6ff; --btn-active-fg: #ffffff;
    --key: #79c0ff; --string: #a5d6ff; --number: #79c0ff; --bool: #ff7b72; --null: #8b949e;
    --valid: #3fb950; --invalid: #f85149; --warn: #d29922;
    --shadow: 0 8px 24px rgba(0,0,0,.4);
    --radius-sm: 6px; --radius-md: 8px; --radius-lg: 12px;
    --gutter-fg: #484f58;
    --scrollbar-bg: transparent; --scrollbar-thumb: #30363d; --scrollbar-thumb-hover: #484f58;
}

/* ═══════ Theme: Light ═══════ */
[data-theme="light"] {
    --bg: #ffffff; --bg-surface: #f6f8fa; --bg-panel: #ffffff;
    --bg-toolbar: #f0f2f5; --bg-hover: #e8ebef; --bg-input: #f6f8fa;
    --border: #d0d7de; --border-soft: #e1e4e8;
    --text: #1f2328; --text-muted: #656d76; --text-subtle: #424a53;
    --accent: #0969da; --accent-hover: #0550ae; --accent-active: #033d8b;
    --btn-fg: #424a53; --btn-bg: #f0f2f5; --btn-hover: #e1e4e8;
    --btn-active-bg: #0969da; --btn-active-fg: #ffffff;
    --key: #0550ae; --string: #0a3069; --number: #0550ae; --bool: #cf222e; --null: #656d76;
    --valid: #1a7f37; --invalid: #cf222e; --warn: #9a6700;
    --shadow: 0 4px 12px rgba(0,0,0,.08);
    --gutter-fg: #8c959f;
    --scrollbar-bg: transparent; --scrollbar-thumb: #d0d7de; --scrollbar-thumb-hover: #afb8c1;
}

/* ═══════ Theme: Monokai ═══════ */
[data-theme="monokai"] {
    --bg: #272822; --bg-surface: #2e2f2a; --bg-panel: #353630;
    --bg-toolbar: #3b3c35; --bg-hover: #49483e; --bg-input: #272822;
    --border: #49483e; --border-soft: #5b5a50;
    --text: #f8f8f2; --text-muted: #a6a69a; --text-subtle: #d0d0c8;
    --accent: #a6e22e; --accent-hover: #b6f23e; --accent-active: #96d21e;
    --btn-fg: #d0d0c8; --btn-bg: #3b3c35; --btn-hover: #49483e;
    --btn-active-bg: #a6e22e; --btn-active-fg: #272822;
    --key: #66d9ef; --string: #e6db74; --number: #ae81ff; --bool: #f92672; --null: #a6a69a;
    --valid: #a6e22e; --invalid: #f92672; --warn: #e6db74;
    --shadow: 0 8px 24px rgba(0,0,0,.5);
    --gutter-fg: #5b5a50;
    --scrollbar-bg: transparent; --scrollbar-thumb: #49483e; --scrollbar-thumb-hover: #5b5a50;
}

/* ═══════ Theme: Dracula ═══════ */
[data-theme="dracula"] {
    --bg: #282a36; --bg-surface: #2d2f3d; --bg-panel: #343746;
    --bg-toolbar: #3a3d4e; --bg-hover: #44475a; --bg-input: #282a36;
    --border: #44475a; --border-soft: #525672;
    --text: #f8f8f2; --text-muted: #9399b2; --text-subtle: #c6cae0;
    --accent: #bd93f9; --accent-hover: #caa4fa; --accent-active: #a87bf0;
    --btn-fg: #c6cae0; --btn-bg: #3a3d4e; --btn-hover: #44475a;
    --btn-active-bg: #bd93f9; --btn-active-fg: #282a36;
    --key: #8be9fd; --string: #f1fa8c; --number: #bd93f9; --bool: #ff79c6; --null: #9399b2;
    --valid: #50fa7b; --invalid: #ff5555; --warn: #f1fa8c;
    --shadow: 0 8px 24px rgba(0,0,0,.5);
    --gutter-fg: #525672;
    --scrollbar-bg: transparent; --scrollbar-thumb: #44475a; --scrollbar-thumb-hover: #525672;
}

/* ═══════ Theme: Nord ═══════ */
[data-theme="nord"] {
    --bg: #2e3440; --bg-surface: #3b4252; --bg-panel: #434c5e;
    --bg-toolbar: #4c566a; --bg-hover: #546178; --bg-input: #2e3440;
    --border: #4c566a; --border-soft: #5d6b82;
    --text: #eceff4; --text-muted: #a3b2c8; --text-subtle: #d8dee9;
    --accent: #88c0d0; --accent-hover: #9dcfe0; --accent-active: #72afc0;
    --btn-fg: #d8dee9; --btn-bg: #4c566a; --btn-hover: #546178;
    --btn-active-bg: #88c0d0; --btn-active-fg: #2e3440;
    --key: #81a1c1; --string: #a3be8c; --number: #b48ead; --bool: #81a1c1; --null: #a3b2c8;
    --valid: #a3be8c; --invalid: #bf616a; --warn: #ebcb8b;
    --shadow: 0 8px 24px rgba(0,0,0,.4);
    --gutter-fg: #5d6b82;
    --scrollbar-bg: transparent; --scrollbar-thumb: #4c566a; --scrollbar-thumb-hover: #5d6b82;
}

/* ═══════ Reset ═══════ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { height: 100%; }
body {
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    font-size: 14px;
    line-height: 1.5;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    transition: background 0.2s, color 0.2s;
}

/* ═══════ Scrollbar ═══════ */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--scrollbar-bg); }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-thumb-hover); }

/* ═══════ Header ═══════ */
.site-header {
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    height: 52px;
    display: flex;
    align-items: center;
    padding: 0 clamp(12px, 2vw, 24px);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background 0.2s;
}
.header-left { display: flex; align-items: center; gap: 10px; }
.header-left .logo { height: 28px; width: auto; }
.header-left .site-name {
    font-size: 1rem; font-weight: 700; color: var(--text);
    text-decoration: none; letter-spacing: -0.3px;
}
.header-right {
    margin-left: auto; display: flex; align-items: center; gap: 6px;
}

/* ═══════ Header Buttons & Dropdowns ═══════ */
.header-btn {
    display: flex; align-items: center; gap: 5px;
    background: var(--btn-bg); border: 1px solid var(--border);
    border-radius: var(--radius-sm); color: var(--text-muted);
    padding: 5px 10px; font-size: 0.82rem; cursor: pointer;
    transition: all 0.15s; font-family: var(--font-sans);
}
.header-btn:hover { background: var(--btn-hover); color: var(--text); }

.dropdown-wrap { position: relative; }
.dropdown-menu {
    position: absolute; top: calc(100% + 4px); right: 0;
    background: var(--bg-panel); border: 1px solid var(--border);
    border-radius: var(--radius-md); box-shadow: var(--shadow);
    display: none; z-index: 200; min-width: 150px; overflow: hidden;
}
.dropdown-menu.show { display: block; }

/* Theme dropdown */
.theme-menu { min-width: 160px; padding: 4px; }
.theme-option {
    display: flex; align-items: center; gap: 8px; width: 100%;
    padding: 7px 10px; background: none; border: none; border-radius: 4px;
    color: var(--text-muted); font-size: 0.82rem; cursor: pointer;
    transition: all 0.12s; font-family: var(--font-sans); text-align: left;
}
.theme-option:hover { background: var(--bg-hover); color: var(--text); }
.theme-option.active { color: var(--accent); font-weight: 600; }
.theme-swatch {
    width: 14px; height: 14px; border-radius: 50%;
    border: 2px solid var(--border); flex-shrink: 0;
}

/* Language dropdown */
.lang-menu { max-height: 400px; overflow-y: auto; min-width: 180px; padding: 4px; }
.lang-menu a {
    display: block; padding: 6px 12px; color: var(--text-muted);
    text-decoration: none; font-size: 0.82rem; border-radius: 4px; transition: all 0.12s;
}
.lang-menu a:hover { background: var(--bg-hover); color: var(--text); }
.lang-menu a.active { color: var(--accent); font-weight: 600; }

/* Convert & Tools dropdown menus */
.convert-menu, .tools-menu { min-width: 180px; padding: 4px; }
.dropdown-group-label {
    padding: 6px 10px 3px; font-size: 0.7rem; font-weight: 700;
    color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px;
}
.dropdown-item {
    display: block; width: 100%; padding: 7px 12px;
    background: none; border: none; border-radius: 4px;
    color: var(--text-subtle); font-size: 0.82rem; cursor: pointer;
    transition: all 0.12s; font-family: var(--font-sans); text-align: left;
}
.dropdown-item:hover { background: var(--bg-hover); color: var(--text); }
.dropdown-sep { height: 1px; background: var(--border); margin: 3px 8px; }
.caret { margin-left: 2px; opacity: 0.6; }

/* ═══════ Hamburger Button (mobile only) ═══════ */
.hamburger-btn {
    display: none;
    align-items: center; justify-content: center;
    background: var(--btn-bg); border: 1px solid var(--border);
    border-radius: var(--radius-sm); color: var(--text-muted);
    padding: 6px; cursor: pointer; transition: all 0.15s;
}
.hamburger-btn:hover { background: var(--btn-hover); color: var(--text); }

/* ═══════ Mobile Menu (slide-in) ═══════ */
.mobile-menu {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    z-index: 1000; display: none; pointer-events: none;
}
.mobile-menu.show { display: block; pointer-events: auto; }
.mobile-menu-backdrop {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.5); opacity: 0;
    transition: opacity 0.3s ease;
}
.mobile-menu.show .mobile-menu-backdrop { opacity: 1; }
.mobile-menu-panel {
    position: absolute; top: 0; right: 0;
    width: 290px; max-width: 85vw; height: 100%;
    background: var(--bg-surface); border-left: 1px solid var(--border);
    transform: translateX(100%); transition: transform 0.3s ease;
    overflow-y: auto; -webkit-overflow-scrolling: touch;
}
.mobile-menu.show .mobile-menu-panel { transform: translateX(0); }
.mobile-menu-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 14px 16px; border-bottom: 1px solid var(--border);
    font-weight: 700; font-size: 1rem; color: var(--text);
}
.mobile-menu-close {
    background: none; border: none; color: var(--text-muted);
    cursor: pointer; padding: 4px; border-radius: 4px; display: flex;
    transition: all 0.12s;
}
.mobile-menu-close:hover { color: var(--text); background: var(--bg-hover); }
.mobile-menu-section {
    padding: 12px 16px; border-bottom: 1px solid var(--border);
}
.mobile-menu-section h4 {
    font-size: 0.72rem; font-weight: 700; color: var(--text-muted);
    text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 8px;
}
.mobile-menu-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 6px;
}
.mobile-menu-item {
    padding: 10px 12px; background: var(--btn-bg);
    border: 1px solid var(--border); border-radius: var(--radius-sm);
    color: var(--text-subtle); font-size: 0.82rem; font-weight: 500;
    cursor: pointer; transition: all 0.12s; font-family: var(--font-sans);
    text-align: center; min-height: 44px;
    display: flex; align-items: center; justify-content: center;
}
.mobile-menu-item:hover, .mobile-menu-item:active {
    background: var(--btn-hover); color: var(--text); border-color: var(--border-soft);
}
.mobile-menu-ai {
    background: linear-gradient(135deg, #7a52a0, var(--accent));
    color: #fff; border-color: transparent;
}
.mobile-menu-ai:hover { opacity: 0.88; }
.mobile-menu-row {
    display: flex; align-items: center; justify-content: space-between;
    padding: 8px 0; gap: 8px;
}
.mobile-menu-label {
    font-size: 0.82rem; color: var(--text-subtle); font-weight: 500;
}
.mobile-menu-row select {
    appearance: none;
    background: var(--btn-bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='%238b949e' viewBox='0 0 24 24'%3E%3Cpath d='M7 10l5 5 5-5H7z'/%3E%3C/svg%3E") no-repeat right 6px center;
    background-size: 16px;
    padding: 6px 26px 6px 10px;
    border: 1px solid var(--border); border-radius: var(--radius-sm);
    color: var(--text-muted); font-size: 0.82rem;
    font-family: var(--font-sans); cursor: pointer;
}
.mobile-menu-row select option { background: var(--bg-panel); color: var(--text); }

/* ═══════ Action Bar ═══════ */
.action-bar {
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    display: flex; align-items: center;
    padding: 7px clamp(12px, 2vw, 24px);
    gap: 6px; flex-wrap: wrap; transition: background 0.2s;
}
.action-group { display: flex; align-items: center; gap: 4px; }
.action-divider {
    width: 1px; height: 22px; background: var(--border);
    margin: 0 4px; flex-shrink: 0;
}
.action-bar .spacer { flex: 1; min-width: 8px; }

.action-btn {
    padding: 5px 11px; background: var(--btn-bg);
    border: 1px solid var(--border); border-radius: var(--radius-sm);
    color: var(--btn-fg); font-size: 0.8rem; font-weight: 600;
    cursor: pointer; display: inline-flex; align-items: center;
    gap: 5px; transition: all 0.15s; font-family: var(--font-sans);
    white-space: nowrap;
}
.action-btn svg { flex-shrink: 0; }
.action-btn:hover { background: var(--btn-hover); color: var(--text); border-color: var(--border-soft); }
.action-btn:active { transform: translateY(0.5px); }
.action-btn.primary { background: var(--accent); color: var(--btn-active-fg); border-color: var(--accent); }
.action-btn.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.action-btn.primary:active { background: var(--accent-active); border-color: var(--accent-active); }
.action-btn.ai-trigger {
    background: linear-gradient(135deg, #7a52a0, var(--accent));
    color: #fff; border-color: transparent;
}
.action-btn.ai-trigger:hover { opacity: 0.88; }

/* Indent select */
.action-bar select {
    appearance: none;
    background: var(--btn-bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='%238b949e' viewBox='0 0 24 24'%3E%3Cpath d='M7 10l5 5 5-5H7z'/%3E%3C/svg%3E") no-repeat right 6px center;
    background-size: 16px;
    padding: 5px 26px 5px 10px; border: 1px solid var(--border);
    border-radius: var(--radius-sm); color: var(--text-muted);
    font-size: 0.8rem; font-family: var(--font-sans); font-weight: 500;
    cursor: pointer; transition: all 0.15s;
}
.action-bar select:hover { background-color: var(--btn-hover); color: var(--text); }
.action-bar select option { background: var(--bg-panel); color: var(--text); }

/* ═══════ Main Layout ═══════ */
main { flex: 1; display: flex; flex-direction: column; }
.wrapper { width: 100%; padding: 0 clamp(8px, 2vw, 24px); }

/* ═══════ Workspace ═══════ */
.workspace {
    flex: 1; display: flex; gap: clamp(8px, 1vw, 14px); margin: 12px 0;
}
.pane {
    flex: 1; min-width: 0; display: flex; flex-direction: column;
    border: 1px solid var(--border); border-radius: var(--radius-md);
    overflow: hidden; background: var(--bg-panel);
    transition: background 0.2s, border-color 0.2s;
}

/* ═══════ Editor Toolbar ═══════ */
.editor-toolbar {
    background: var(--bg-toolbar); color: var(--text-muted);
    height: 38px; display: flex; align-items: center;
    padding: 0 10px; gap: 8px; font-size: 0.82rem;
    border-bottom: 1px solid var(--border); transition: background 0.2s;
}
.editor-toolbar .spacer { flex: 1; }
.toolbar-label {
    font-weight: 700; color: var(--text-subtle);
    font-size: 0.78rem; text-transform: uppercase;
    letter-spacing: 0.6px; margin-right: 2px;
}

/* ═══════ Mini Buttons ═══════ */
.btn-mini {
    background: none; border: none; color: var(--text-muted);
    font-size: 0.8rem; display: inline-flex; align-items: center;
    gap: 4px; padding: 3px 7px; border-radius: 4px; cursor: pointer;
    transition: all 0.12s; font-family: var(--font-sans); white-space: nowrap;
}
.btn-mini:hover { color: var(--text); background: var(--bg-hover); }
.btn-mini.copy-btn:hover { color: var(--accent); }
.btn-mini.clear-btn:hover { color: var(--invalid); }
.btn-mini.copied { color: var(--valid); }

/* ═══════ View Tabs ═══════ */
.view-tabs {
    display: flex; background: var(--bg-input); border-radius: 5px;
    padding: 2px; border: 1px solid var(--border); gap: 1px;
}
.view-tab {
    padding: 2px 10px; background: none; border: none; border-radius: 4px;
    color: var(--text-muted); font-size: 0.76rem; font-weight: 500;
    cursor: pointer; transition: all 0.15s; font-family: var(--font-sans);
}
.view-tab:hover { color: var(--text); }
.view-tab.active { background: var(--btn-bg); color: var(--text); font-weight: 600; }

/* ═══════ Ace Editor ═══════ */
.ace_editor {
    flex: 1; min-height: 38vh;
    background: var(--bg-panel) !important; color: var(--text); transition: background 0.2s;
}
.ace_editor .ace_gutter {
    background: var(--bg-panel) !important; color: var(--gutter-fg) !important; transition: background 0.2s;
}
.ace_editor .ace_print-margin { display: none; }
.ace_editor .ace_cursor { color: var(--text) !important; }
.ace_editor .ace_marker-layer .ace_active-line { background: rgba(128,128,128,.06) !important; }

/* ═══════ Status Bar ═══════ */
.status-bar {
    background: var(--bg-toolbar); color: var(--text-muted);
    height: 24px; font-size: 0.74rem; display: flex;
    align-items: center; padding: 0 10px; justify-content: space-between;
    border-top: 1px solid var(--border); font-family: var(--font-mono); transition: background 0.2s;
}
.stats-bar { display: flex; gap: 14px; align-items: center; }
.stat-item { display: flex; gap: 3px; }
.stat-label { color: var(--gutter-fg); }
.stat-value { color: var(--text-subtle); }
.status-msg { font-weight: 700; font-family: var(--font-sans); }
.status-msg.valid { color: var(--valid); }
.status-msg.invalid { color: var(--invalid); }
.status-msg.warning { color: var(--warn); }

/* ═══════ Tree View ═══════ */
.tree-view {
    flex: 1; overflow: auto; padding: 12px 16px;
    background: var(--bg-panel); color: var(--text);
    font-family: var(--font-mono); font-size: 12.5px; line-height: 1.7;
    transition: background 0.2s; content-visibility: auto;
}
.tree-item { margin-left: 18px; position: relative; }
.tree-row { display: flex; align-items: baseline; padding: 0 4px; border-radius: 3px; }
.tree-row:hover { background: var(--bg-hover); }
.tree-expand {
    display: inline-flex; align-items: center; justify-content: center;
    width: 16px; height: 16px; margin-right: 2px; cursor: pointer;
    user-select: none; color: var(--text-muted); font-size: 10px;
    flex-shrink: 0; border-radius: 3px; transition: all 0.12s;
}
.tree-expand:hover { color: var(--text); background: var(--bg-hover); }
.tree-leaf-pad { display: inline-block; width: 18px; flex-shrink: 0; }
.tree-key { color: var(--key); font-weight: 600; cursor: pointer; }
.tree-key:hover { text-decoration: underline; }
.tree-colon { color: var(--text-muted); margin: 0 3px 0 1px; }
.tree-string { color: var(--string); }
.tree-number { color: var(--number); }
.tree-bool { color: var(--bool); font-weight: 600; }
.tree-null { color: var(--null); font-style: italic; }
.tree-bracket { color: var(--text-muted); font-weight: 400; }
.tree-type {
    display: inline-block; padding: 0 4px; border-radius: 3px;
    font-size: 0.68em; font-weight: 600; margin-left: 6px;
    text-transform: uppercase; letter-spacing: 0.3px;
    opacity: 0.65; vertical-align: middle; line-height: 1.6;
}
.tree-type-str  { background: rgba(165,214,255,.1); color: var(--string); }
.tree-type-num  { background: rgba(121,192,255,.1); color: var(--number); }
.tree-type-bool { background: rgba(255,123,114,.1); color: var(--bool); }
.tree-type-null { background: rgba(139,148,158,.15); color: var(--null); }
.tree-type-obj  { background: rgba(78,201,176,.1);  color: var(--key); }
.tree-type-arr  { background: rgba(215,186,125,.1);  color: var(--warn); }
.tree-count { color: var(--text-muted); font-size: 0.85em; margin-left: 4px; }
.tree-children { border-left: 1px solid var(--border); margin-left: 7px; padding-left: 0; }
.tree-empty {
    color: var(--text-muted); font-style: italic; padding: 20px;
    text-align: center; font-family: var(--font-sans);
}

/* ═══════ AI Panel ═══════ */
.ai-panel {
    background: var(--bg-surface); border: 1px solid var(--border);
    border-radius: var(--radius-md); margin: 0 0 12px 0;
    display: none; flex-direction: column; max-height: 380px;
    transition: background 0.2s; content-visibility: auto;
}
.ai-panel.show { display: flex; }
.ai-header {
    display: flex; align-items: center; gap: 8px;
    padding: 8px 14px; border-bottom: 1px solid var(--border);
    background: var(--bg-toolbar); border-radius: var(--radius-md) var(--radius-md) 0 0;
}
.ai-header .ai-icon { color: var(--accent); display: flex; }
.ai-header h3 { font-size: 0.85rem; font-weight: 600; color: var(--text); }
.ai-badges { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.ai-badge {
    display: inline-flex; align-items: center;
    padding: 2px 8px; border-radius: 999px;
    border: 1px solid var(--border); background: var(--bg-panel);
    color: var(--text-muted); font-size: 0.68rem; font-weight: 700;
    letter-spacing: 0.02em;
}
.ai-model-badge { color: var(--accent); }
.ai-header .spacer { flex: 1; }
.ai-close-btn {
    background: none; border: none; color: var(--text-muted);
    cursor: pointer; padding: 3px; border-radius: 4px; display: flex;
    transition: all 0.12s;
}
.ai-close-btn:hover { color: var(--text); background: var(--bg-hover); }
.ai-quick-prompts {
    display: flex; gap: 5px; padding: 7px 14px;
    flex-wrap: wrap; border-bottom: 1px solid var(--border);
}
.ai-quick-btn {
    padding: 3px 10px; background: var(--btn-bg);
    border: 1px solid var(--border); border-radius: 14px;
    color: var(--text-muted); font-size: 0.74rem; cursor: pointer;
    transition: all 0.12s; font-family: var(--font-sans);
}
.ai-quick-btn:hover { background: var(--btn-hover); color: var(--text); border-color: var(--border-soft); }
.ai-status {
    display: none; align-items: center; gap: 8px;
    padding: 7px 14px; border-bottom: 1px solid var(--border);
    background: linear-gradient(180deg, rgba(88,166,255,.08), transparent);
}
.ai-status.is-active { display: flex; }
.ai-status-pulse {
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 0 0 rgba(88,166,255,.34);
    animation: aiPulse 1.8s infinite;
}
.ai-status-text {
    font-size: 0.78rem; font-weight: 700; color: var(--text);
    letter-spacing: 0.02em;
}
.ai-status-timer {
    margin-left: auto; min-width: 42px; text-align: right;
    font-family: var(--font-mono); font-size: 0.76rem; color: var(--text-muted);
}
.ai-response {
    flex: 1; overflow-y: auto; padding: 12px 14px;
    font-size: 0.85rem; line-height: 1.65; color: var(--text-subtle);
    word-break: break-word;
}
.ai-response code {
    background: var(--bg-input); padding: 1px 5px; border-radius: 3px;
    font-family: var(--font-mono); font-size: 0.88em; color: var(--accent);
}
.ai-response pre {
    background: var(--bg-input); padding: 10px; border-radius: var(--radius-sm);
    overflow-x: auto; margin: 6px 0; border: 1px solid var(--border);
    white-space: pre-wrap; word-break: break-word;
}
.ai-response pre code { background: none; padding: 0; color: var(--text); }
.ai-response .ai-placeholder { color: var(--text-muted); font-style: italic; }
.ai-response h2, .ai-response h3, .ai-response h4 {
    margin: 8px 0 4px; color: var(--text);
}
.ai-response strong { color: var(--text); }
.ai-response .ai-answer { color: var(--text-subtle); }
.ai-response .ai-answer.is-streaming { white-space: pre-wrap; }
.ai-response .ai-inline-error {
    display: block; padding: 10px 12px; border-radius: var(--radius-sm);
    border: 1px solid rgba(248,81,73,.4); background: rgba(248,81,73,.08);
    color: var(--invalid);
}
.ai-thinking-card {
    position: relative; display: flex; align-items: center; justify-content: space-between;
    gap: 16px; padding: 14px 16px; margin-bottom: 12px;
    border: 1px solid var(--border-soft); border-radius: 16px;
    background: linear-gradient(135deg, rgba(88,166,255,.12), rgba(88,166,255,.05) 48%, rgba(63,185,80,.08));
    overflow: hidden;
}
.ai-thinking-card::after {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(110deg, transparent 0%, rgba(255,255,255,.12) 46%, transparent 72%);
    transform: translateX(-100%);
    animation: aiThinkingSweep 2.8s linear infinite;
}
.ai-thinking-copy { position: relative; z-index: 1; min-width: 0; }
.ai-thinking-title { font-size: 0.95rem; font-weight: 700; color: var(--text); }
.ai-thinking-hint { margin-top: 4px; font-size: 0.8rem; color: var(--text-muted); }
.ai-thinking-bars {
    position: relative; z-index: 1; display: inline-flex; align-items: flex-end;
    gap: 4px; height: 22px; flex-shrink: 0;
}
.ai-thinking-bars span {
    width: 4px; height: 100%; border-radius: 999px;
    background: linear-gradient(180deg, var(--accent), rgba(63,185,80,.92));
    transform-origin: center bottom;
    animation: aiThinkingBars 1.1s ease-in-out infinite;
}
.ai-thinking-bars span:nth-child(2) { animation-delay: 0.14s; }
.ai-thinking-bars span:nth-child(3) { animation-delay: 0.28s; }
.ai-thinking-bars span:nth-child(4) { animation-delay: 0.42s; }
.ai-reasoning-panel {
    border: 1px solid rgba(88,166,255,.24);
    border-radius: 14px; padding: 12px 14px; margin-bottom: 12px;
    background:
        radial-gradient(circle at 16% 14%, rgba(88,166,255,.16), transparent 32%),
        linear-gradient(180deg, rgba(88,166,255,.07), rgba(22,27,34,.28));
    box-shadow: inset 0 1px 0 rgba(255,255,255,.04);
}
.ai-reasoning-panel.is-live { border-color: rgba(88,166,255,.34); }
.ai-reasoning-head {
    display: flex; align-items: center; justify-content: space-between;
    gap: 10px; margin-bottom: 10px;
}
.ai-reasoning-title {
    font-size: 0.72rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 0.08em; color: var(--accent);
}
.ai-reasoning-badge {
    padding: 3px 8px; border-radius: 999px; border: 1px solid rgba(88,166,255,.22);
    background: rgba(88,166,255,.10); color: var(--text);
    font-size: 0.68rem; font-weight: 700;
}
.ai-reasoning-body {
    font-size: 0.8rem; line-height: 1.7; color: var(--text-subtle);
}
.ai-reasoning-body.is-streaming { white-space: pre-wrap; }
.ai-apply-btn {
    display: inline-block; margin: 4px 0; padding: 3px 10px;
    background: var(--accent); color: var(--btn-active-fg);
    border: none; border-radius: var(--radius-sm); font-size: 0.75rem;
    font-weight: 600; cursor: pointer; font-family: var(--font-sans);
    transition: all 0.15s;
}
.ai-apply-btn:hover { background: var(--accent-hover); }
.ai-input-bar {
    display: flex; gap: 6px; padding: 8px 14px;
    border-top: 1px solid var(--border); background: var(--bg-toolbar);
    border-radius: 0 0 var(--radius-md) var(--radius-md);
}
.ai-input-bar input {
    flex: 1; background: var(--bg-input); border: 1px solid var(--border);
    border-radius: var(--radius-sm); padding: 6px 10px;
    color: var(--text); font-size: 0.85rem; font-family: var(--font-sans);
    outline: none; transition: border-color 0.2s;
}
.ai-input-bar input:focus { border-color: var(--accent); }
.ai-input-bar input::placeholder { color: var(--text-muted); }
.ai-send-btn {
    background: var(--accent); border: none; border-radius: var(--radius-sm);
    color: var(--btn-active-fg); padding: 6px 14px; font-weight: 600;
    font-size: 0.82rem; cursor: pointer; display: flex; align-items: center;
    gap: 5px; transition: all 0.15s; font-family: var(--font-sans);
}
.ai-send-spinner {
    display: none; width: 12px; height: 12px; border-radius: 50%;
    border: 2px solid rgba(255,255,255,.35); border-top-color: #fff;
    animation: spin 0.8s linear infinite;
}
.ai-send-btn.is-loading .ai-send-spinner { display: inline-block; }
.ai-send-btn.is-loading .ai-send-icon { display: none; }
.ai-send-btn:hover { background: var(--accent-hover); }
.ai-send-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ═══════ Diff Modal ═══════ */
.modal-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.5); z-index: 500;
    display: none; align-items: center; justify-content: center;
    padding: 20px;
}
.modal-overlay.show { display: flex; }
.modal-panel {
    background: var(--bg-surface); border: 1px solid var(--border);
    border-radius: var(--radius-lg); box-shadow: var(--shadow);
    width: 100%; max-width: 600px; padding: 20px;
}
.modal-header {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 12px;
}
.modal-header h3 { font-size: 1rem; font-weight: 700; color: var(--text); }
.modal-close {
    background: none; border: none; color: var(--text-muted);
    cursor: pointer; padding: 4px; border-radius: 4px; display: flex;
    transition: all 0.12s;
}
.modal-close:hover { color: var(--text); background: var(--bg-hover); }
.modal-label {
    display: block; font-size: 0.85rem; color: var(--text-subtle);
    margin-bottom: 8px;
}
.modal-textarea {
    width: 100%; background: var(--bg-input); border: 1px solid var(--border);
    border-radius: var(--radius-sm); padding: 10px; color: var(--text);
    font-family: var(--font-mono); font-size: 0.85rem; resize: vertical;
    outline: none; transition: border-color 0.2s; min-height: 120px;
}
.modal-textarea:focus { border-color: var(--accent); }
.modal-actions {
    display: flex; justify-content: flex-end; gap: 8px; margin-top: 12px;
}

/* ═══════ Loading Overlay ═══════ */
.loading-overlay {
    position: fixed; top: 50%; left: 50%; transform: translate(-50%,-50%);
    background: var(--bg-panel); padding: 1.5rem 2rem;
    border-radius: var(--radius-lg); box-shadow: var(--shadow);
    z-index: 9999; display: none; text-align: center; border: 1px solid var(--border);
}
.loading-overlay.show { display: block; }
.spinner {
    width: 36px; height: 36px; border: 3px solid var(--border);
    border-top-color: var(--accent); border-radius: 50%;
    animation: spin 0.7s linear infinite; margin: 0 auto 10px;
}
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes aiPulse {
    0% { box-shadow: 0 0 0 0 rgba(88,166,255,.34); }
    70% { box-shadow: 0 0 0 8px rgba(88,166,255,0); }
    100% { box-shadow: 0 0 0 0 rgba(88,166,255,0); }
}
@keyframes aiThinkingBars {
    0%, 100% { transform: scaleY(.35); opacity: .65; }
    50% { transform: scaleY(1); opacity: 1; }
}
@keyframes aiThinkingSweep {
    to { transform: translateX(100%); }
}

/* ═══════ Toast ═══════ */
.toast {
    position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
    background: var(--bg-toolbar); color: var(--text);
    padding: 7px 16px; border-radius: var(--radius-sm);
    font-size: 0.84rem; z-index: 9999;
    border: 1px solid var(--border); box-shadow: var(--shadow);
    animation: toastIn 0.2s ease; font-family: var(--font-sans);
}
@keyframes toastIn { from { opacity: 0; transform: translateX(-50%) translateY(10px); } }

/* ═══════ Share Icons (header) ═══════ */
.share-icons {
    display: flex;
    gap: 4px;
    margin-left: 14px;
    align-items: center;
}
.share-icon-btn {
    width: 30px; height: 30px;
    border-radius: var(--radius-sm); border: none;
    background: var(--btn-bg); color: var(--text-muted);
    cursor: pointer; display: flex; align-items: center;
    justify-content: center; padding: 0;
    transition: all 180ms ease;
}
.share-icon-btn:hover {
    background: var(--btn-hover); color: var(--text);
    transform: scale(1.12);
}
.share-icon-btn:active { transform: scale(0.95); }
.share-icon-btn svg { pointer-events: none; }
.share-icon-btn.is-copied { color: var(--valid); }

/* ═══════ Footer ═══════ */
.site-footer {
    background: var(--bg-surface); border-top: 1px solid var(--border);
    padding: 12px clamp(12px, 2vw, 24px); display: flex;
    align-items: center; justify-content: space-between;
    font-size: 0.78rem; color: var(--text-muted); transition: background 0.2s;
}
.footer-links { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
.footer-links a { color: var(--text-muted); text-decoration: none; transition: color 0.12s; }
.footer-links a:hover { color: var(--text); }
.footer-sep { color: var(--border); user-select: none; }

/* ═══════ Utilities ═══════ */
.hidden-form { display: none; }
.error-display {
    padding: 12px; background: rgba(248,81,73,.08);
    border: 1px solid var(--invalid); border-radius: var(--radius-sm);
    margin: 12px; color: var(--invalid);
}
.error-line { font-weight: 600; margin-bottom: 3px; }
.error-msg { font-family: var(--font-mono); font-size: 0.85rem; }
.shortcut-hint {
    font-size: 0.68rem; color: var(--text-muted); opacity: 0.6;
    margin-left: 4px; font-family: var(--font-mono);
}

/* ═══════ Responsive ═══════ */
@media (max-width: 1100px) {
    .workspace { flex-direction: column; }
    .pane { min-height: 280px; }
    .shortcut-hint { display: none; }
}

@media (max-width: 768px) {
    .hamburger-btn { display: flex; }
    .desktop-only { display: none !important; }
    .action-bar { display: none; }
    .workspace { gap: 8px; margin: 8px 0; }
    .tree-view { font-size: 11px; padding: 8px; }
    .editor-toolbar { flex-wrap: wrap; height: auto; padding: 5px 8px; gap: 4px; }
    .ace_editor { font-size: 12px !important; min-height: 30vh; }
    .site-header { height: 46px; }
    .header-left .logo { height: 24px; }
    .ai-panel { max-height: 300px; }
    .ai-quick-prompts { padding: 5px 8px; }
    .modal-panel { padding: 16px; }
}

@media (max-width: 500px) {
    .header-left .site-name { display: none; }
    .stats-bar { display: none; }
    .wrapper { padding: 0 6px; }
    .ai-panel { max-height: 260px; }
    .site-footer { flex-direction: column; gap: 6px; text-align: center; }
    .btn-mini span { display: none; }
    .editor-toolbar { gap: 2px; }
}

/* ═══════ Print ═══════ */
@media print {
    .site-header, .action-bar, .site-footer, .ai-panel,
    .mobile-menu, .modal-overlay, .hamburger-btn { display: none !important; }
    .workspace { display: block; }
    .pane { border: none; min-height: auto; }
    .ace_editor { min-height: auto; }
}