/* ============================================================
   DibujaApp — Estilos principales (Tema Oscuro Refinado)
   Toolbar rediseñada: secciones agrupadas expandibles, layout ancho
   ============================================================ */

/* ---------- Variables CSS ---------- */
:root {
    /*
      PALETA: Inspirada en Linear / Figma / Notion
      Fondos: negro cálido con matices sutiles
      Acento: azul índigo desaturado — serio y elegante
    */

    /* Fondo y superficie */
    --bg-primary: #0e0e10;
    --bg-secondary: #151518;
    --bg-tertiary: #1c1c20;
    --bg-hover: #232328;
    --bg-active: #2a2a30;
    --bg-elevated: #1a1a1e;

    /* Texto */
    --text-primary: #e4e4e7;
    --text-secondary: #a1a1aa;
    --text-muted: #52525b;
    --text-faint: #3f3f46;

    /* Acentos — azul índigo sobrio */
    --accent-primary: #6d7df5;
    --accent-primary-hover: #8190f7;
    --accent-primary-subtle: rgba(109, 125, 245, 0.1);
    --accent-secondary: #5b8cf7;
    --accent-success: #3fb950;
    --accent-warning: #d4a72c;
    --accent-danger: #f85149;

    /* Bordes — sutiles, casi invisibles */
    --border-color: rgba(255, 255, 255, 0.06);
    --border-light: rgba(255, 255, 255, 0.1);
    --border-strong: rgba(255, 255, 255, 0.15);

    /* Sombras — suaves y con color */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4), 0 1px 3px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5), 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 0 1px rgba(109, 125, 245, 0.15), 0 0 20px rgba(109, 125, 245, 0.08);

    /* Espaciado */
    --header-height: 48px;
    --toolbar-width: 260px;
    --statusbar-height: 26px;

    /* Radios — más sutiles */
    --radius-sm: 5px;
    --radius-md: 7px;
    --radius-lg: 10px;
    --radius-xl: 14px;

    /* Transiciones — más fluidas */
    --transition-fast: 120ms cubic-bezier(0.2, 0, 0.38, 0.9);
    --transition-normal: 200ms cubic-bezier(0.2, 0, 0.38, 0.9);
    --transition-slow: 300ms cubic-bezier(0.2, 0, 0.38, 0.9);

    /* Tipografía */
    --font-sans: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
}

/* ---------- Reset y base ---------- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    display: grid;
    grid-template-rows: var(--header-height) 1fr;
    grid-template-columns: var(--toolbar-width) 1fr;
    grid-template-areas:
        "header header"
        "toolbar canvas";
    font-size: 14px;
    line-height: 1.5;
}

/* ---------- Header ---------- */
.app-header {
    grid-area: header;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
    height: var(--header-height);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.app-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
    line-height: 1;
}

.drawing-id-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 11px;
    color: var(--text-muted);
    font-family: var(--font-mono);
    letter-spacing: 0.02em;
    line-height: 1.4;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 6px;
}

/* ---------- Botones generales ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 5px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 500;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    line-height: 1.4;
    letter-spacing: 0.01em;
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    outline: none;
}

.btn:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--border-light);
}

.btn:active {
    background-color: var(--bg-active);
    transform: scale(0.98);
}

.btn:focus-visible {
    box-shadow: var(--shadow-glow);
    border-color: var(--accent-primary);
}

.btn-primary {
    background-color: var(--accent-primary);
    color: #ffffff;
    border-color: transparent;
}

.btn-primary:hover {
    background-color: var(--accent-primary-hover);
    border-color: transparent;
    color: #ffffff;
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
}

.btn-secondary:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.btn-accent {
    background-color: var(--bg-tertiary);
    color: var(--accent-primary);
    border-color: var(--border-color);
}

.btn-accent:hover {
    background-color: var(--accent-primary-subtle);
    border-color: var(--accent-primary);
    color: var(--accent-primary-hover);
}

/* ---------- Dropdown ---------- */
.dropdown {
    position: relative;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    background-color: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    z-index: 200;
    overflow: hidden;
    backdrop-filter: blur(12px);
}

.dropdown-menu.show {
    display: block;
    animation: fadeIn 0.15s ease;
}

.dropdown-item {
    display: block;
    width: 100%;
    padding: 9px 14px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 13px;
    font-family: var(--font-sans);
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-fast);
    line-height: 1.4;
}

.dropdown-item:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.dropdown-item + .dropdown-item {
    border-top: 1px solid var(--border-color);
}

/* ============================================================
   TOOLBAR — Rediseñada con secciones agrupadas expandibles
   ============================================================ */

.toolbar {
    grid-area: toolbar;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    overflow-x: hidden;
    padding: 8px 0;
    z-index: 50;
    scrollbar-width: thin;
    scrollbar-color: var(--border-light) transparent;
}

.toolbar::-webkit-scrollbar {
    width: 3px;
}

.toolbar::-webkit-scrollbar-track {
    background: transparent;
}

.toolbar::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 3px;
}

/* ---------- Grupo de la toolbar ---------- */
.toolbar-group {
    padding: 0 8px;
    margin-bottom: 4px;
}

.toolbar-group:last-child {
    margin-bottom: 0;
}

/* Separador visual entre grupos */
.toolbar-group + .toolbar-group {
    border-top: 1px solid var(--border-color);
    padding-top: 8px;
    margin-top: 8px;
}

/* ---------- Cabecera de grupo (expandible) ---------- */
.toolbar-group-header {
    display: flex;
    align-items: center;
    width: 100%;
    gap: 8px;
    padding: 7px 10px;
    background: none;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 600;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all var(--transition-fast);
    outline: none;
    letter-spacing: 0.01em;
    user-select: none;
}

.toolbar-group-header:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.toolbar-group-header:focus-visible {
    box-shadow: var(--shadow-glow);
    border-radius: var(--radius-md);
}

/* Cabecera estática (no expandible) */
.toolbar-group-header-static {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 7px 10px;
    color: var(--text-muted);
    font-size: 11px;
    font-weight: 600;
    font-family: var(--font-sans);
    letter-spacing: 0.04em;
    text-transform: uppercase;
    user-select: none;
}

/* Icono del grupo */
.group-icon {
    font-size: 14px;
    line-height: 1;
    flex-shrink: 0;
    width: 18px;
    text-align: center;
}

/* Etiqueta del grupo */
.group-label {
    flex: 1;
}

/* Chevron animado */
.group-chevron {
    font-size: 10px;
    line-height: 1;
    color: var(--text-muted);
    transition: transform var(--transition-normal);
    flex-shrink: 0;
    display: inline-block;
}

.toolbar-group-header[aria-expanded="true"] .group-chevron {
    transform: rotate(90deg);
}

/* ---------- Contenido del grupo (expandible) ---------- */
.toolbar-group-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow), opacity var(--transition-fast);
    opacity: 0;
}

/* Estado expandido */
.toolbar-group-header[aria-expanded="true"] + .toolbar-group-content {
    max-height: 500px;
    opacity: 1;
}

/* Estado siempre abierto (no expandible) */
.toolbar-group-content-open {
    max-height: none;
    opacity: 1;
    transition: none;
}

/* ---------- Botones de herramienta (layout horizontal) ---------- */
.tool-btn {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    width: 100%;
    height: auto;
    min-height: 34px;
    gap: 10px;
    padding: 5px 10px;
    background: none;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    outline: none;
    line-height: 1.3;
    text-align: left;
}

.tool-btn:hover {
    background-color: var(--bg-hover);
    color: var(--text-secondary);
}

.tool-btn:active {
    background-color: var(--bg-active);
}

.tool-btn:focus-visible {
    box-shadow: var(--shadow-glow);
    border-color: var(--accent-primary);
}

.tool-btn.active {
    background-color: var(--accent-primary-subtle);
    border-color: rgba(109, 125, 245, 0.2);
    color: var(--accent-primary);
}

.tool-btn.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 18px;
    background-color: var(--accent-primary);
    border-radius: 0 2px 2px 0;
}

.tool-btn .tool-icon {
    font-size: 15px;
    line-height: 1;
    flex-shrink: 0;
    width: 18px;
    text-align: center;
}

.tool-btn .tool-label {
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.01em;
    line-height: 1.3;
    text-transform: none;
}

/* Botón de herramienta pequeño (relleno, etc.) */
.tool-btn.tool-btn-small {
    min-height: 28px;
    padding: 4px 10px;
}

/* Botón de herramienta solo ícono (zoom) */
.tool-btn.tool-btn-icon-only {
    width: auto;
    min-height: 28px;
    padding: 4px 6px;
    justify-content: center;
}

.tool-btn.tool-btn-icon-only .tool-icon {
    width: auto;
}

/* ---------- Grupo standalone (Texto) ---------- */
.toolbar-group-standalone {
    padding: 0 8px;
}

.toolbar-group-standalone .tool-btn {
    /* same as above */
}

/* ---------- Selector de color ---------- */
.color-picker-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 10px;
}

#colorPicker {
    width: 32px;
    height: 28px;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    cursor: pointer;
    padding: 2px;
    background: none;
    outline: none;
    transition: border-color var(--transition-fast);
}

#colorPicker:hover {
    border-color: var(--border-strong);
}

#colorPicker::-webkit-color-swatch-wrapper {
    padding: 0;
}

#colorPicker::-webkit-color-swatch {
    border: none;
    border-radius: 3px;
}

.color-hex {
    font-size: 11px;
    color: var(--text-muted);
    font-family: var(--font-mono);
    letter-spacing: 0.01em;
}

/* ---------- Colores predefinidos ---------- */
.preset-colors {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    padding: 4px 10px 6px;
}

.color-swatch {
    width: 22px;
    height: 22px;
    border: 2px solid transparent;
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
    padding: 0;
    outline: none;
    box-shadow: var(--shadow-sm);
}

.color-swatch:hover {
    transform: scale(1.15);
    box-shadow: var(--shadow-md);
}

.color-swatch.active {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(109, 125, 245, 0.25);
}

/* ---------- Control de grosor ---------- */
.style-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 10px;
}

.style-label {
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 500;
    flex-shrink: 0;
}

#strokeWidth {
    flex: 1;
    accent-color: var(--accent-primary);
    cursor: pointer;
    height: 4px;
}

.stroke-width-value {
    font-size: 11px;
    color: var(--text-muted);
    font-family: var(--font-mono);
    letter-spacing: 0.01em;
    flex-shrink: 0;
    min-width: 32px;
    text-align: right;
}

/* ---------- Zoom ---------- */
.zoom-row {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
}

.zoom-level {
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 500;
    font-family: var(--font-mono);
    letter-spacing: 0.01em;
    flex: 1;
    text-align: center;
}

/* ---------- Área del Canvas ---------- */
.canvas-area {
    grid-area: canvas;
    position: relative;
    overflow: hidden;
    background-color: var(--bg-primary);
    display: flex;
    flex-direction: column;
}

#drawingCanvas {
    flex: 1;
    display: block;
    cursor: crosshair;
    background-color: var(--bg-primary);
    /* Patrón de cuadrícula sutil y refinado */
    background-image:
        radial-gradient(circle, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
    background-size: 24px 24px;
}

/* ---------- Barra de estado ---------- */
.status-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 12px;
    height: var(--statusbar-height);
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    font-size: 11px;
    color: var(--text-muted);
    gap: 16px;
    flex-shrink: 0;
    font-family: var(--font-mono);
    letter-spacing: 0.01em;
}

.status-tool {
    color: var(--accent-primary);
    font-weight: 500;
    font-family: var(--font-sans);
    letter-spacing: 0;
}

.status-coords {
    font-family: var(--font-mono);
}

.status-elements {
    font-family: var(--font-mono);
}

/* ---------- Modales ---------- */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(8px);
}

.modal-overlay.show {
    display: flex;
    animation: fadeIn 0.2s ease;
}

.modal {
    background-color: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 400px;
    overflow: hidden;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 14px;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 18px;
    cursor: pointer;
    line-height: 1;
    padding: 2px 4px;
    transition: color var(--transition-fast);
    border-radius: var(--radius-sm);
}

.modal-close:hover {
    color: var(--text-primary);
    background-color: var(--bg-hover);
}

.modal-body {
    padding: 20px;
}

.modal-body label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
    letter-spacing: 0.01em;
}

.modal-body input[type="text"] {
    width: 100%;
    padding: 9px 12px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 13px;
    font-family: var(--font-sans);
    outline: none;
    transition: all var(--transition-fast);
    letter-spacing: 0.01em;
}

.modal-body input[type="text"]:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(109, 125, 245, 0.1);
}

.modal-body input[type="text"]::placeholder {
    color: var(--text-faint);
}

.modal-hint {
    margin-top: 12px;
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.5;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    padding: 14px 20px;
    border-top: 1px solid var(--border-color);
}

/* ---------- Notificaciones Toast ---------- */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column-reverse;
    gap: 8px;
    pointer-events: none;
}

.toast {
    padding: 10px 14px;
    background-color: var(--bg-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    color: var(--text-primary);
    font-size: 13px;
    font-family: var(--font-sans);
    pointer-events: auto;
    animation: slideIn 0.3s ease;
    max-width: 320px;
    letter-spacing: 0.01em;
    line-height: 1.4;
}

.toast.success {
    border-left: 3px solid var(--accent-success);
}

.toast.error {
    border-left: 3px solid var(--accent-danger);
}

.toast.info {
    border-left: 3px solid var(--accent-secondary);
}

/* ---------- Animaciones ---------- */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(24px) translateY(4px);
    }
    to {
        opacity: 1;
        transform: translateX(0) translateY(0);
    }
}

/* ---------- Responsive: tablet ---------- */
@media (max-width: 1024px) {
    :root {
        --toolbar-width: 220px;
    }
}

/* ---------- Responsive: móvil ---------- */
@media (max-width: 640px) {
    body {
        grid-template-columns: 1fr;
        grid-template-rows: var(--header-height) auto 1fr;
        grid-template-areas:
            "header"
            "toolbar"
            "canvas";
    }

    .toolbar {
        flex-direction: row;
        flex-wrap: wrap;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding: 4px;
        overflow-x: auto;
        overflow-y: hidden;
        gap: 2px;
    }

    .toolbar-group {
        padding: 0 4px;
        margin-bottom: 0;
    }

    .toolbar-group + .toolbar-group {
        border-top: none;
        border-left: 1px solid var(--border-color);
        padding-top: 0;
        margin-top: 0;
        padding-left: 4px;
        margin-left: 4px;
    }

    .toolbar-group-content {
        max-height: none !important;
        opacity: 1 !important;
    }

    .toolbar-group-header {
        display: none;
    }

    .toolbar-group-header-static {
        display: none;
    }

    .tool-btn {
        width: auto;
        min-height: 32px;
        padding: 4px 8px;
        gap: 6px;
    }

    .tool-btn .tool-label {
        display: none;
    }

    .tool-btn .tool-icon {
        width: auto;
    }

    .preset-colors {
        flex-direction: row;
    }

    .header-right .btn span {
        display: none;
    }

    .drawing-id-badge {
        display: none;
    }
}

/* ---------- Utilidades ---------- */
.hidden {
    display: none !important;
}

/* ---------- Cursor personalizado según herramienta ---------- */
#drawingCanvas.tool-select { cursor: default; }
#drawingCanvas.tool-freehand { cursor: crosshair; }
#drawingCanvas.tool-rectangle { cursor: crosshair; }
#drawingCanvas.tool-circle { cursor: crosshair; }
#drawingCanvas.tool-line { cursor: crosshair; }
#drawingCanvas.tool-arrow { cursor: crosshair; }
#drawingCanvas.tool-text { cursor: text; }
#drawingCanvas.tool-eraser { cursor: cell; }