:root {
    --bg-body: #f8fafc;
    --bg-sidebar: #ffffff;
    --primary: #6366f1;
    --primary-light: #e0e7ff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05);
    --radius: 10px;
}

body {
    background-color: var(--bg-body);
    font-family: 'Inter', system-ui, sans-serif;
    color: var(--text-main);
    margin: 0; padding-bottom: 0;
    height: 100vh; display: flex; flex-direction: column;
}

/* HEADER */
.studio-header {
    height: 60px; background: white; border-bottom: 1px solid var(--border);
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 20px; flex-shrink: 0; z-index: 20;
    box-shadow: var(--shadow-sm);
}
.brand { font-weight: 800; font-size: 1.2rem; display: flex; align-items: center; gap: 10px; }
.brand img { height: 24px; width: auto; object-fit: contain; display: block; }

/* Controles Historial */
.history-group {
    display: flex; gap: 8px; background: #f1f5f9; padding: 4px; border-radius: 8px;
}
.hist-btn {
    width: 32px; height: 32px; border-radius: 6px; border: 1px solid transparent;
    background: white; color: var(--text-main); cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: all 0.2s ease;
}
.hist-btn:hover:not(:disabled) { border-color: var(--primary); color: var(--primary); box-shadow: 0 2px 4px rgba(0,0,0,0.05); transform: translateY(-1px); }
.hist-btn:active:not(:disabled) { transform: translateY(0); }
.hist-btn:disabled { opacity: 0.5; cursor: not-allowed; background: transparent; }

/* LAYOUT */
.studio-layout { flex: 1; display: flex; overflow: hidden; }

/* SIDEBAR */
.tools-sidebar {
    width: 360px; background: var(--bg-sidebar); border-right: 1px solid var(--border);
    display: flex; flex-direction: column; overflow-y: auto; flex-shrink: 0;
}
/* Scrollbar bonita */
.tools-sidebar::-webkit-scrollbar { width: 6px; }
.tools-sidebar::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 3px; }
.tools-sidebar::-webkit-scrollbar-track { background: transparent; }

/* Acordeón */
.tool-category { border-bottom: 1px solid var(--border); }
.category-header {
    padding: 16px 20px; cursor: pointer; font-weight: 600; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.5px;
    display: flex; justify-content: space-between; align-items: center;
    color: var(--text-muted); transition: 0.2s; user-select: none;
}
.category-header:hover { background: #f8fafc; color: var(--primary); }
.category-header i { transition: transform 0.3s ease; }
.tool-category.active .category-header { color: var(--text-main); background: #fcfcfc; }
.tool-category.active .category-header i { transform: rotate(180deg); color: var(--primary); }

.category-content { display: none; padding: 10px 20px 20px 20px; background: #ffffff; }
.tool-category.active .category-content { display: block; animation: slideDown 0.3s ease; }
@keyframes slideDown { from { opacity: 0; transform: translateY(-5px); } to { opacity: 1; transform: translateY(0); } }

/* Botones Herramientas */
.tools-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.tool-btn {
    padding: 10px; border: 1px solid var(--border); border-radius: 8px;
    background: white; color: var(--text-muted); font-size: 0.8rem; font-weight: 500;
    cursor: pointer; transition: all 0.2s ease;
    display: flex; align-items: center; justify-content: center; gap: 6px; text-align: center;
}
.tool-btn:hover {
    border-color: var(--primary); color: var(--primary); background: #f5f7ff;
    transform: translateY(-2px); box-shadow: 0 3px 6px rgba(99, 102, 241, 0.1);
}
.tool-btn:active { transform: translateY(0); }
.tool-btn i { font-size: 0.9rem; }

.btn-full { grid-column: span 2; justify-content: flex-start; padding-left: 15px; }

/* Inputs Sidebar */
.sidebar-input {
    width: 100%; padding: 10px 12px; border: 1px solid var(--border);
    border-radius: 8px; margin-bottom: 10px; font-size: 0.9rem; outline: none; transition: 0.2s;
}
.sidebar-input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1); }

/* ÁREA DE TRABAJO */
.editor-area {
    flex: 1; display: flex; flex-direction: column;
    background: #f1f5f9; padding: 20px; gap: 15px;
}

.editor-toolbar {
    display: flex; justify-content: space-between; align-items: center;
    background: white; padding: 10px 20px; border-radius: 12px;
    border: 1px solid var(--border); box-shadow: var(--shadow-sm);
}
.stats-group { display: flex; gap: 20px; font-size: 0.85rem; color: var(--text-muted); font-family: monospace; }
.stat-item b { color: var(--text-main); }

.action-btn {
    background: transparent; border: 1px solid transparent; color: var(--text-muted);
    cursor: pointer; padding: 6px 12px; border-radius: 6px; transition: 0.2s;
    font-size: 0.9rem; display: flex; align-items: center; gap: 6px;
}
.action-btn:hover { background: #f1f5f9; color: var(--primary); border-color: var(--border); }

.text-wrapper {
    flex: 1; display: flex; flex-direction: column;
    background: white; border-radius: 12px; border: 1px solid var(--border);
    overflow: hidden; box-shadow: var(--shadow-md); position: relative;
}
textarea {
    flex: 1; border: none; padding: 25px; resize: none; outline: none;
    font-family: 'Fira Code', 'Consolas', monospace; /* Fuente Monospace moderna */
    font-size: 0.95rem; line-height: 1.6; color: var(--text-main);
    background: transparent;
}
/* Placeholder sutil */
textarea::placeholder { color: #cbd5e1; font-style: italic; }

/* Modo oscuro */
body.theme-dark {
    --bg-body: #0b0d12;
    --bg-sidebar: #111827;
    --text-main: #e5e7eb;
    --text-muted: #9ca3af;
    --border: rgba(255,255,255,0.08);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.6);
    --shadow-md: 0 6px 10px -2px rgba(0,0,0,0.7);
}
body.theme-dark .studio-header { background: #0f172a; }
body.theme-dark .brand img { filter: invert(1); }
body.theme-dark .history-group { background: rgba(255,255,255,0.06); }
body.theme-dark .hist-btn { background: #0b1220; color: var(--text-main); border-color: var(--border); }
body.theme-dark .hist-btn:disabled { background: transparent; }
body.theme-dark .tools-sidebar { background: var(--bg-sidebar); }
body.theme-dark .category-header:hover { background: rgba(255,255,255,0.04); }
body.theme-dark .tool-category.active .category-header { background: rgba(255,255,255,0.02); }
body.theme-dark .category-content { background: #0f172a; }
body.theme-dark .tool-btn { background: #0b1220; color: var(--text-muted); border-color: var(--border); }
body.theme-dark .tool-btn:hover { background: rgba(99,102,241,0.12); color: #c7d2fe; }
body.theme-dark .editor-area { background: #0b0f18; }
body.theme-dark .editor-toolbar { background: #0f172a; border-color: var(--border); }
body.theme-dark .action-btn:hover { background: rgba(255,255,255,0.05); }
body.theme-dark .text-wrapper { background: #0f172a; border-color: var(--border); }
body.theme-dark textarea { color: var(--text-main); }
body.theme-dark textarea::placeholder { color: #6b7280; }
body.theme-dark .sidebar-input { background: #0b1220; color: var(--text-main); border-color: var(--border); }
body.theme-dark .sidebar-input::placeholder { color: #6b7280; }