:root { 
    --bg-page: #f4f6f9; 
    --bg-surface: #ffffff; 
    --accent: #2962ff; 
    --accent-hover: #1f4fd1;
    --success: #00c853; 
    --danger: #d50000; 
    --warning: #ffc107; 
    --info: #00b0ff;
    --text-primary: #212529; 
    --text-secondary: #666666; 
    --text-muted: #999999; 
    --border: #e0e0e0;
    --font-base: system-ui, -apple-system, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, monospace;
    --rail-width: 68px;
    --top-bar-height: 4px;
    --icon-stroke: 1.5px;
}

[data-theme="dark"] {
    --bg-page: #121212;
    --bg-surface: #1e1e1e;
    --accent: #4477ff;
    --accent-hover: #5588ff;
    --text-primary: #e0e0e0;
    --text-secondary: #aaaaaa;
    --border: #333333;
}

* { box-sizing: border-box; }
body { margin: 0; font-family: var(--font-base); display: flex; height: 100vh; background: var(--bg-page); color: var(--text-primary); overflow: hidden; transition: background-color 0.3s, color 0.3s; }
.font-mono { font-family: var(--font-mono); letter-spacing: 0.5px; font-size: 0.95em;}
svg.icon { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: var(--icon-stroke); stroke-linecap: round; stroke-linejoin: round; }

/* Barras y Navegación */
.top-accent-bar { position: fixed; top: 0; left: 0; right: 0; height: var(--top-bar-height); background-color: var(--accent); z-index: 1000; }
.nav-rail { width: var(--rail-width); background-color: var(--bg-surface); border-right: 1px solid var(--border); display: flex; flex-direction: column; align-items: center; padding: 20px 0; margin-top: var(--top-bar-height); z-index: 999; transition: background-color 0.3s, border-color 0.3s; }
.nav-rail .brand-logo { width: 36px; height: auto; margin-bottom: 24px; }
.nav-item { width: 44px; height: 44px; display: flex; align-items: center; justify-content: center; border-radius: 8px; margin-bottom: 12px; color: var(--text-secondary); cursor: pointer; position: relative; transition: all 0.2s; border: none; background: transparent; }
.nav-item:hover { background-color: rgba(0, 0, 0, 0.05); color: var(--text-primary); }
[data-theme="dark"] .nav-item:hover { background-color: rgba(255, 255, 255, 0.08); }
.nav-item.active { background-color: #e6f1fb; color: #185fa5; }
[data-theme="dark"] .nav-item.active { background-color: rgba(68, 119, 255, 0.15); color: var(--accent); }
.nav-item[title]:hover::after { content: attr(title); position: absolute; left: 60px; background-color: var(--text-primary); color: var(--bg-surface); padding: 6px 10px; border-radius: 4px; font-size: 12px; font-weight: 500; white-space: nowrap; z-index: 1000; pointer-events: none; box-shadow: 0 2px 5px rgba(0,0,0,0.2); }
.spacer { flex: 1; }

/* Estructura Principal */
.content { flex: 1; display: flex; flex-direction: column; margin-top: var(--top-bar-height); overflow: hidden; position: relative; }
.tab-content { display: none; flex: 1; overflow-y: auto; flex-direction: column; }
.tab-content.active { display: flex; }
.content-header { background-color: var(--bg-surface); padding: 16px 32px; border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; min-height: 72px;}
.content-header h1 { margin: 0; font-size: 1.25rem; font-weight: 600; color: var(--text-primary); }
.header-actions { display: flex; gap: 12px; align-items: center;}
.content-body { padding: 32px; flex: 1; overflow-y: auto; display: flex; flex-direction: column;}

/* Botones y Badges */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 8px 16px; border-radius: 8px; font-size: 0.9rem; font-weight: 500; cursor: pointer; border: none; transition: all 0.2s; font-family: var(--font-base); }
.btn-primary { background-color: var(--accent); color: #ffffff; }
.btn-primary:hover { background-color: var(--accent-hover); }
.btn-secondary { background-color: transparent; color: var(--text-primary); border: 1px solid var(--border); }
.btn-secondary:hover { background-color: rgba(0,0,0,0.03); }
[data-theme="dark"] .btn-secondary:hover { background-color: rgba(255,255,255,0.05); }

.badge { display: inline-flex; align-items: center; gap: 4px; padding: 4px 8px; border-radius: 6px; font-size: 0.75rem; font-weight: 600; }
.badge-pending { background-color: #fff3cd; color: #856404; }
.badge-success { background-color: #d4edda; color: #155724; }
.badge-warning { background-color: #ffeeba; color: #856404; }
.badge-danger { background-color: #f8d7da; color: #721c24; }
.badge-primary { background-color: #cce5ff; color: #004085; }
[data-theme="dark"] .badge-pending, [data-theme="dark"] .badge-warning { background-color: rgba(255, 193, 7, 0.15); color: var(--warning); }
[data-theme="dark"] .badge-success { background-color: rgba(0, 200, 83, 0.15); color: var(--success); }
[data-theme="dark"] .badge-danger { background-color: rgba(213, 0, 0, 0.15); color: var(--danger); }
[data-theme="dark"] .badge-primary { background-color: rgba(41, 98, 255, 0.15); color: #82aaff; }

/* Formularios y Tablas */
.form-group { margin-bottom: 1.2rem; position: relative; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 600; font-size: 0.85rem; color: var(--text-secondary); }
.form-control { width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; box-sizing: border-box; font-size: 0.9rem; background-color: var(--bg-page); color: var(--text-primary); transition: border-color 0.2s; font-family: var(--font-base); outline: none;}
.form-control:focus { border-color: var(--accent); }
.is-invalid { border-color: var(--danger) !important; background-color: rgba(213, 0, 0, 0.05) !important; box-shadow: 0 0 0 2px rgba(213, 0, 0, 0.1) !important; }

.grid-filters { display: flex; gap: 15px; margin-bottom: 20px; align-items: center; background: var(--bg-surface); padding: 12px 16px; border-radius: 10px; border: 1px solid var(--border); box-shadow: 0 2px 8px rgba(0,0,0,0.02);}
.grid-filters input[type="text"] { max-width: 300px; padding: 8px 12px; border: 1px solid var(--border); border-radius: 6px; font-size: 0.85rem; background: var(--bg-page); color: var(--text-primary);}
.grid-filters label { font-size: 0.85rem; font-weight: 600; color: var(--text-secondary); display: flex; align-items: center; gap: 6px; cursor: pointer; margin:0;}

.table-container { background: var(--bg-surface); border-radius: 10px; overflow: hidden; box-shadow: 0 2px 8px rgba(0,0,0,0.04); border: 1px solid var(--border); margin-bottom: 30px;}
table { width: 100%; border-collapse: collapse; }
th, td { padding: 14px 18px; text-align: left; border-bottom: 1px solid var(--border); font-size: 0.9rem; }
th { background: var(--bg-page); font-weight: 600; color: var(--text-secondary); font-size: 0.85rem; }
th.sortable { cursor: pointer; user-select: none; position: relative; transition: background 0.2s;}
th.sortable:hover { background: rgba(0,0,0,0.03); color: var(--text-primary); }
[data-theme="dark"] th.sortable:hover { background: rgba(255,255,255,0.05); }

/* Modales y Kanban */
.kanban-board { display: flex; flex-direction: row; gap: 1.5rem; height: 100%; padding-bottom: 1rem; align-items: flex-start; box-sizing: border-box; overflow-x: auto;}
.kanban-column { background: var(--bg-page); border-radius: 10px; padding: 16px; display: flex; flex-direction: column; flex: 1; min-width: 300px; max-width: 400px; max-height: 100%; box-sizing: border-box; border: 1px solid var(--border);}
.kanban-column h3 { margin: 0 0 16px 0; font-size: 1rem; color: var(--text-primary); display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--border); padding-bottom: 10px;}
.kanban-column-count { background: var(--border); border-radius: 12px; padding: 2px 8px; font-size: 0.75rem; font-weight: bold; color: var(--text-secondary);}
.kanban-cards-container { display: flex; flex-direction: column; gap: 12px; overflow-y: auto; flex: 1; padding-right:4px;}
.kanban-card { background: var(--bg-surface); border-radius: 10px; padding: 16px; box-shadow: 0 2px 6px rgba(0,0,0,0.04); border: 1px solid var(--border); transition: transform 0.2s; }
.kanban-card:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,0.08); }
.card-header { display: flex; justify-content: space-between; margin-bottom: 12px; align-items: center;}
.card-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px; padding-top: 12px; border-top: 1px solid var(--border);}

.modal { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); z-index: 9999; justify-content: center; align-items: center; backdrop-filter: blur(2px);}
.modal.active { display: flex; }
.modal-content { background: var(--bg-surface); padding: 32px; border-radius: 12px; width: 500px; position: relative; max-height: 90vh; overflow-y: auto; box-shadow: 0 15px 35px rgba(0,0,0,0.2); box-sizing: border-box; border: 1px solid var(--border);}
.modal-large { width: 850px; } 
.close-btn { position: absolute; top: 20px; right: 24px; cursor: pointer; font-size: 1.5rem; border: none; background: none; color: var(--text-muted); transition: color 0.2s;}
.close-btn:hover { color: var(--text-primary); }
.modal-content h3 { margin-top: 0; margin-bottom: 24px; color: var(--text-primary); font-size: 1.25rem;}

.site-footer { padding: 16px; text-align: center; font-size: 0.8rem; color: var(--text-muted); display: flex; align-items: center; justify-content: center; gap: 8px; background: var(--bg-surface); border-top: 1px solid var(--border); width: 100%; margin-top: auto;}
.site-footer a { color: var(--text-muted); text-decoration: none; font-weight: 600; transition: color 0.2s; }
.site-footer a:hover { color: var(--accent); }
.watermark-logo { height: 16px; opacity: 0.5; }

/* Responsive General */
@media (max-width: 768px) {
    body { flex-direction: column; }
    .nav-rail { width: 100%; height: auto; padding: 10px; flex-direction: row; flex-wrap: wrap; justify-content: center; gap: 5px; border-right: none; border-bottom: 1px solid var(--border);}
    .nav-rail .brand-logo { margin-bottom: 0; margin-right: 16px; }
    .nav-item { margin-bottom: 0; }
    .nav-item[title]:hover::after { display: none; }
    .content-header { flex-direction: column; align-items: flex-start; gap: 12px; padding: 16px; }
    .content-body { padding: 16px; }
    .kanban-board { flex-direction: column; height: auto; }
    .kanban-column { width: 100% !important; min-width: 100% !important; max-width: 100% !important; margin-bottom: 1.5rem; max-height: none;}
    .modal-content { padding: 24px; width: 95%;}
}