/* ===========================================================
   CIMA SYSTEM — ESTILOS CORE
   [CSS-001] Variables y Temas
   [CSS-002] Reset y Base
   [CSS-003] Componentes Shell (Dock, Background)
   =========================================================== */

/* [CSS-001] Variables Globales y Temas */
:root {
    /* TEMA DARK (Default) */
    --color-bg: #0a0e17;
    --color-glass: rgba(255, 255, 255, 0.05);
    --color-glass-heavy: rgba(255, 255, 255, 0.12);
    --color-border: rgba(255, 255, 255, 0.12);
    --color-border-heavy: rgba(255, 255, 255, 0.2);
    --color-text: #f0f0f0;
    --color-text-dim: #a0a0a0;
    --color-accent: #00d4aa;
    --color-accent-hover: #00b894;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    
    /* Gradiente de fondo sutil */
    --bg-gradient: radial-gradient(circle at 20% 30%, rgba(0, 212, 170, 0.08) 0%, transparent 40%),
                   radial-gradient(circle at 80% 70%, rgba(59, 130, 246, 0.08) 0%, transparent 40%);
    
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;
    --transition: 0.3s ease;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-heavy: 0 12px 48px rgba(0, 0, 0, 0.5);
    --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
}

/* TEMA LIGHT (Activado por clase .light-mode en body) */
body.light-mode {
    --color-bg: #f0f2f5;
    --color-glass: rgba(255, 255, 255, 0.65);
    --color-glass-heavy: rgba(255, 255, 255, 0.85);
    --color-border: rgba(0, 0, 0, 0.08);
    --color-border-heavy: rgba(0, 0, 0, 0.15);
    --color-text: #1a202c;
    --color-text-dim: #4a5568;
    --color-accent: #00b894; 
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    --shadow-heavy: 0 12px 48px rgba(0, 0, 0, 0.12);
    --bg-gradient: radial-gradient(circle at 20% 30%, rgba(0, 212, 170, 0.05) 0%, transparent 40%),
                   radial-gradient(circle at 80% 70%, rgba(59, 130, 246, 0.05) 0%, transparent 40%);
}

/* [CSS-002] Reset y Base */
* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: var(--font-main);
    background: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
    transition: background 0.3s ease, color 0.3s ease;
}

/* [CSS-003] Fondo Glass */
.background {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: var(--bg-gradient);
    z-index: -1;
    pointer-events: none;
}

/* [CSS-004] Shell Controls */
.shell-controls {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
}

.icon-btn {
    width: 40px; height: 40px;
    border-radius: 50%;
    background: var(--color-glass);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    backdrop-filter: blur(10px);
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.icon-btn:hover {
    background: var(--color-glass-heavy);
    color: var(--color-accent);
    transform: rotate(15deg);
}

/* [CSS-005] Dock Flotante */
.dock {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 12px 24px;
    display: flex;
    gap: 20px;
    z-index: 100;
    box-shadow: var(--shadow);
    transition: var(--transition);
    min-width: 300px;
    justify-content: center;
    align-items: center;
}

.dock span {
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
    opacity: 0.7;
}

.dock span:hover, .dock span.active {
    color: var(--color-accent);
    opacity: 1;
}

/* [CSS-006] Contenedor Principal */
.app-container {
    position: relative;
    min-height: 100vh;
    padding-top: 100px; /* Espacio para el Dock */
    padding-bottom: 40px;
    width: 95%;
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* [CSS-007] Utilidades */
.hidden { display: none !important; }

.glass-panel {
    background: var(--color-glass);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow);
}

.fade-in {
    animation: fadeIn 0.4s ease-out forwards;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.loading-spinner {
    color: var(--color-accent);
    font-size: 2rem;
    margin-top: 50px;
}