/* ============================================
   Sketch on Top - Main Styles
   Tema Oscuro | Responsive Design
   ============================================ */

:root {
    /* Colores del tema oscuro */
    --bg-primary: #1a1a1a;
    --bg-secondary: #2a2a2a;
    --bg-tertiary: #3a3a3a;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --border-color: #404040;
    --accent-color: #0d6efd;
    --accent-hover: #0b5ed7;
    --success-color: #198754;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    
    /* Espaciado */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Dimensiones */
    --top-bar-height: 80px;
    --bottom-bar-height: 40px;
    --border-radius: 6px;
    
    /* Safe areas para iOS (notch, home indicator) */
    --safe-area-inset-top: env(safe-area-inset-top, 0px);
    --safe-area-inset-bottom: env(safe-area-inset-bottom, 0px);
    --safe-area-inset-left: env(safe-area-inset-left, 0px);
    --safe-area-inset-right: env(safe-area-inset-right, 0px);
    
    /* Sombras */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.5);
}

/* ============================================
   RESET Y BASE
   ============================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    /* Triple fallback para altura del viewport en iOS/Safari:
       1. 100vh (navegadores antiguos)
       2. calc(var(--vh) * 100) (JavaScript dinámico para iOS)
       3. 100dvh (navegadores modernos con soporte nativo) */
    height: 100vh;
    height: calc(var(--vh, 1vh) * 100);
    height: 100dvh;
    display: flex;
    flex-direction: column;
    /* Evitar que iOS Safari haga zoom en inputs */
    -webkit-text-size-adjust: 100%;
}

/* ============================================
   BARRA SUPERIOR
   ============================================ */

.top-bar {
    position: relative; /* Crear contexto de apilamiento */
    height: var(--top-bar-height);
    background-color: var(--bg-secondary);
    border-bottom: 2px solid var(--border-color);
    box-shadow: var(--shadow-md);
    padding: 0 var(--spacing-lg);
    /* Agregar padding superior para notch de iOS */
    padding-top: var(--safe-area-inset-top);
    display: flex;
    align-items: center;
    z-index: 1000;
}

.brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.brand-icon {
    font-size: 2rem;
    color: var(--accent-color);
}

.brand-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
    color: var(--text-primary);
}

.main-nav {
    /* Placeholder para navegación futura */
}

.user-section {
    font-size: 1.8rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.3s;
}

.user-section:hover {
    color: var(--text-primary);
}

/* ============================================
   ÁREA CENTRAL - CANVAS
   ============================================ */

.canvas-area {
    flex: 1;
    position: relative;
    overflow: hidden;
    background-color: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    /* NO z-index aquí - dejar que las barras controlen el stacking */
}

#drawing-canvas {
    display: block;
    background-color: transparent;
    cursor: crosshair;
    touch-action: none; /* Importante para soporte táctil */
    /* NO position ni z-index - mantenerlo en flujo normal */
}

/* ============================================
   BARRA INFERIOR - HERRAMIENTAS
   ============================================ */

.bottom-bar {
    position: relative; /* Crear contexto de apilamiento para dropdowns */
    height: auto; /* Altura automática para no cortar contenido */
    min-height: var(--bottom-bar-height);
    background-color: var(--bg-secondary);
    border-top: 2px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    /* Agregar padding inferior para home indicator de iOS */
    /* padding-bottom: calc(var(--spacing-md) + var(--safe-area-inset-bottom)); */
    z-index: 1000;
    /* NO overflow aquí - lo manejamos en el contenedor interno */
    overflow: visible;
}

.toolbar-scroll-container {
    overflow-x: auto; /* Scroll horizontal solo en este contenedor */
    overflow-y: visible;
    padding: var(--spacing-xs) var(--spacing-lg) 0 var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    /* Ocultar scrollbar en WebKit (Safari, Chrome) */
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
}

.toolbar-scroll-container::-webkit-scrollbar {
    height: 4px;
}

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

.toolbar-scroll-container::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 2px;
}

.toolbar-scroll-container::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

.toolbar {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    height: auto;
    min-height: 50px;
    flex-wrap: nowrap;
    margin-right: var(--spacing-lg);
}

.toolbar-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    min-width: fit-content;
}

.toolbar-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: 0;
    white-space: nowrap;
}

.toolbar-divider {
    min-width: 1px;
    width: 1px;
    height: 50px;
    background-color: var(--border-color);
    align-self: center;
}

/* ============================================
   SCROLLBAR PERSONALIZADA
   ============================================ */

.bottom-bar::-webkit-scrollbar {
    height: 8px;
}

.bottom-bar::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

.bottom-bar::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.bottom-bar::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* ============================================
   RESPONSIVE
   ============================================ */

/* Tablets */
@media (max-width: 992px) {
    :root {
        --top-bar-height: 60px;
        --bottom-bar-height: 70px;
        --spacing-lg: 1rem;
        --spacing-md: 0.75rem;
    }
    
    .brand-title {
        font-size: 1.25rem;
    }
    
    .brand-icon {
        font-size: 1.75rem;
    }
    
    .toolbar {
        gap: var(--spacing-md);
    }
    
    .toolbar-section {
        gap: 0.25rem;
    }
    
    .toolbar-label {
        font-size: 0.7rem;
    }
    
    .toolbar-divider {
        height: 40px;
    }
    
    /* Reducir padding de la bottom-bar para ganar espacio */
    .bottom-bar {
        padding: var(--spacing-sm) var(--spacing-md);
    }
}

/* Mobile */
@media (max-width: 576px) {
    :root {
        --top-bar-height: 50px;
        --bottom-bar-height: 60px;
    }
    
    .brand-title {
        font-size: 1rem;
    }
    
    .brand-icon {
        font-size: 1.5rem;
    }
    
    .user-section {
        font-size: 1.5rem;
    }
    
    .toolbar {
        gap: var(--spacing-sm);
    }
    
    .toolbar-label {
        font-size: 0.65rem;
    }
}