:root {
    /* Mac OS Glassmorphism Variables - Dark Mode (Default) */
    --bg-main: #000000;
    --bg-sidebar: rgba(25, 25, 25, 0.6);
    --bg-card: rgba(30, 30, 30, 0.5);
    --bg-input: rgba(40, 40, 40, 0.6);
    
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    
    --accent-primary: #007aff; /* Mac Blue */
    --accent-primary-hover: #0056b3;
    --accent-secondary: #af52de; /* Mac Purple */
    --accent-tertiary: #34c759; /* Mac Green */
    
    --success: #34c759;
    --warning: #ffcc00;
    --danger: #ff3b30;
    
    --border-color: rgba(255, 255, 255, 0.1);
    
    --border-radius-card: 16px;
    --border-radius-input: 10px;
    --border-radius-badge: 6px;
    
    --shadow-sm: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-md: 0 10px 30px rgba(0,0,0,0.3);
    
    --glass-blur: blur(20px);
    --transition-speed: 0.3s;
}

/* Light Mode Variables */
body.light-mode {
    --bg-main: #f5f5f7; /* Mac Light Gray */
    --bg-sidebar: rgba(255, 255, 255, 0.7);
    --bg-card: rgba(255, 255, 255, 0.6);
    --bg-input: rgba(255, 255, 255, 0.8);
    
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    
    --border-color: rgba(0, 0, 0, 0.08);
    
    --shadow-sm: 0 4px 6px rgba(0,0,0,0.05);
    --shadow-md: 0 10px 30px rgba(0,0,0,0.08);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    transition: background-color var(--transition-speed), color var(--transition-speed);
    /* Fondo macOS abstracto */
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(0, 122, 255, 0.15), transparent 50%),
        radial-gradient(circle at 85% 30%, rgba(175, 82, 222, 0.15), transparent 50%);
    background-attachment: fixed;
}

h1, h2, h3, h4, h5, h6 { margin-top: 0; font-weight: 600; letter-spacing: -0.5px; }
p { color: var(--text-secondary); }
a { color: var(--accent-primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-primary-hover); }
.text-accent { color: var(--accent-primary); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 18px;
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--border-radius-input);
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    font-family: inherit;
    backdrop-filter: blur(10px);
}

.btn-primary {
    background-color: var(--accent-primary);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(0, 122, 255, 0.3);
}

.btn-primary:hover {
    background-color: var(--accent-primary-hover);
    transform: translateY(-1px);
}

.btn-ghost {
    background-color: transparent;
    color: var(--text-secondary);
}
.btn-ghost:hover {
    background-color: rgba(128, 128, 128, 0.1);
    color: var(--text-primary);
}

/* Forms */
.form-group { margin-bottom: 20px; }
label { display: block; margin-bottom: 8px; font-size: 13px; font-weight: 500; color: var(--text-secondary); }
input[type="text"], input[type="email"], input[type="password"] {
    width: 100%;
    padding: 12px 16px;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-input);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 14px;
    backdrop-filter: blur(10px);
    transition: border-color 0.2s, box-shadow 0.2s;
}
input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.15);
}

/* Auth specific */
.auth-container { width: 100%; max-width: 420px; padding: 20px; margin: 0 auto; display: flex; flex-direction: column; justify-content: center; min-height: 100vh; }
.auth-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-card);
    padding: 40px;
    box-shadow: var(--shadow-md);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
}
.auth-header { text-align: center; margin-bottom: 30px; }
.auth-header .logo { display: flex; align-items: center; justify-content: center; gap: 10px; font-size: 26px; font-weight: 700; margin-bottom: 8px; letter-spacing: -1px; }
.auth-header p { margin: 0; font-size: 14px; }
.form-options { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; font-size: 13px; }
.checkbox-label { display: flex; align-items: center; gap: 8px; cursor: pointer; color: var(--text-secondary); }
.auth-footer { text-align: center; margin-top: 30px; font-size: 13px; color: var(--text-secondary); }

/* App Layout */
.app-layout { display: flex; min-height: 100vh; overflow: hidden; }

/* Sidebar */
.sidebar {
    width: 280px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    transition: width var(--transition-speed), transform var(--transition-speed);
    z-index: 10;
}

.sidebar.collapsed { width: 80px; }
.sidebar.collapsed .logo span, .sidebar.collapsed .nav-item span, .sidebar.collapsed .user-info { display: none; }
.sidebar.collapsed .sidebar-header { padding: 0; justify-content: center; }
.sidebar.collapsed .nav-item { padding: 12px; justify-content: center; }

.sidebar-header {
    height: 70px; display: flex; align-items: center; padding: 0 24px;
    border-bottom: 1px solid rgba(128,128,128,0.1);
}
.sidebar-header .logo {
    display: flex; align-items: center; gap: 12px; font-size: 20px; font-weight: 700; letter-spacing: -0.5px;
}

.sidebar-nav { flex: 1; padding: 24px 16px; display: flex; flex-direction: column; gap: 6px; }
.nav-item {
    display: flex; align-items: center; gap: 14px; padding: 12px 16px;
    color: var(--text-secondary); border-radius: var(--border-radius-badge);
    font-weight: 500; font-size: 14px; transition: all 0.2s;
}
.nav-item:hover { color: var(--text-primary); background-color: rgba(128,128,128,0.1); }
.nav-item.active { color: #ffffff; background-color: var(--accent-primary); box-shadow: 0 4px 12px rgba(0, 122, 255, 0.3); }

.sidebar-footer { padding: 16px; border-top: 1px solid rgba(128,128,128,0.1); }
.user-profile { display: flex; align-items: center; gap: 12px; }
.avatar {
    width: 40px; height: 40px; border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    display: flex; align-items: center; justify-content: center; color: white; font-weight: 600;
}
.user-info { flex: 1; display: flex; flex-direction: column; }
.user-name { font-size: 14px; font-weight: 600; }
.user-role { font-size: 12px; color: var(--text-secondary); }
.logout-btn { color: var(--text-secondary); padding: 8px; border-radius: 50%; }
.logout-btn:hover { color: var(--danger); background-color: rgba(255,59,48,0.1); }

/* Main Content Wrapper */
.main-wrapper { flex: 1; display: flex; flex-direction: column; position: relative; }

.topbar {
    height: 70px; display: flex; align-items: center; justify-content: space-between;
    padding: 0 32px; border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-sidebar);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    position: sticky; top: 0; z-index: 5;
}

.topbar-left { display: flex; align-items: center; gap: 20px; }
.page-title { font-size: 20px; margin: 0; }

.topbar-actions { display: flex; align-items: center; gap: 20px; }
.clock-widget {
    display: flex; flex-direction: column; align-items: flex-end;
    font-size: 13px; color: var(--text-secondary);
}
.clock-time { font-weight: 600; color: var(--text-primary); font-size: 14px; }

.content-area { padding: 32px; flex: 1; overflow-y: auto; }

/* Dashboard Grid */
.dashboard-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; margin-bottom: 32px; }
.kpi-card {
    background-color: var(--bg-card); border: 1px solid var(--border-color);
    border-radius: var(--border-radius-card); padding: 24px;
    display: flex; align-items: center; gap: 20px;
    box-shadow: var(--shadow-sm); transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.3s;
    backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur);
}
.kpi-card:hover { transform: translateY(-4px) scale(1.02); box-shadow: var(--shadow-md); }
.kpi-icon {
    width: 54px; height: 54px; border-radius: 14px;
    background-color: rgba(128,128,128,0.1);
    display: flex; align-items: center; justify-content: center;
}
.kpi-details { flex: 1; }
.kpi-label { margin: 0 0 6px 0; font-size: 13px; font-weight: 500; }
.kpi-value { margin: 0; font-size: 28px; font-weight: 700; letter-spacing: -1px; }

/* Cards (Panels) */
.card {
    background-color: var(--bg-card); border: 1px solid var(--border-color);
    border-radius: var(--border-radius-card); overflow: hidden;
    backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur);
    box-shadow: var(--shadow-sm);
}
.card-header { padding: 20px 24px; border-bottom: 1px solid rgba(128,128,128,0.1); display: flex; justify-content: space-between; align-items: center; }
.card-title { margin: 0; font-size: 16px; font-weight: 600; }
.card-body { padding: 24px; }